Drawing
Overview
Provides functions such as 2D graphics rendering, text drawing, and image display.
Provides the 2D drawing capability.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Since: 8
Summary
Files
| Name | Description |
|---|---|
| drawing_bitmap.h | Declares functions related to the bitmap object in the drawing module. File to Include: <native_drawing/drawing_bitmap.h> |
| drawing_brush.h | Declares functions related to the brush object in the drawing module. File to Include: <native_drawing/drawing_brush.h> |
| drawing_canvas.h | Declares functions related to the canvas object in the drawing module. File to Include: <native_drawing/drawing_canvas.h> |
| drawing_color.h | Declares functions related to the color object in the drawing module. File to Include: <native_drawing/drawing_color.h> |
| drawing_font_collection.h | Declares functions related to FontCollection in the drawing module. File to Include: <native_drawing/drawing_font_collection.h> |
| drawing_path.h | Declares functions related to the path object in the drawing module. File to Include: <native_drawing/drawing_path.h> |
| drawing_pen.h | Declares functions related to the pen object in the drawing module. File to Include: <native_drawing/drawing_pen.h> |
| drawing_text_declaration.h | Declares the data structure related to text in 2D drawing. File to Include: <native_drawing/drawing_text_declaration.h> |
| drawing_text_typography.h | Declares functions related to typography in the drawing module. File to Include: <native_drawing/drawing_text_typography.h> |
| drawing_types.h | Declares the data types for drawing 2D graphics, including the canvas, brush, pen, bitmap, and path. File to Include: <native_drawing/drawing_types.h> |
Structs
| Name | Description |
|---|---|
| OH_Drawing_BitmapFormat | Defines the pixel format of a bitmap, including the color type and alpha type. |
Types
| Name | Description |
|---|---|
| OH_Drawing_FontCollection | Defines an OH_Drawing_FontCollection, which is used to load fonts. |
| OH_Drawing_Typography | Defines an OH_Drawing_Typography, which is used to manage the typography layout and display. |
| OH_Drawing_TextStyle | Defines an OH_Drawing_TextStyle, which is used to manage text colors and decorations. |
| OH_Drawing_TypographyStyle | Defines an OH_Drawing_TypographyStyle, which is used to manage the typography style, such as the text direction. |
| OH_Drawing_TypographyCreate | Defines an OH_Drawing_TypographyCreate, which is used to create an OH_Drawing_Typography object. |
| OH_Drawing_Canvas | Defines a rectangular canvas on which various shapes, images, and texts can be drawn by using the brush and pen. |
| OH_Drawing_Pen | Defines a pen, which is used to describe the style and color to outline a shape. |
| OH_Drawing_Brush | Defines as a brush, which is used to describe the style and color to fill in a shape. |
| OH_Drawing_Path | Defines a path, which is used to customize various shapes. |
| OH_Drawing_Bitmap | Defines a bitmap, which is a memory that contains the pixel data of a shape. |
Enums
| Name | Description |
|---|---|
| OH_Drawing_PenLineCapStyle { LINE_FLAT_CAP, LINE_SQUARE_CAP, LINE_ROUND_CAP } | Enumerates line cap styles of a pen. The line cap style defines the style of both ends of a line segment drawn by the pen. |
| OH_Drawing_PenLineJoinStyle { LINE_MITER_JOIN, LINE_ROUND_JOIN, LINE_BEVEL_JOIN } | Enumerates pen line join styles. The line join style defines the shape of the joints of a polyline segment drawn by the pen. |
| OH_Drawing_TextDirection { TEXT_DIRECTION_RTL, TEXT_DIRECTION_LTR } | Enumerates text directions. |
| OH_Drawing_TextAlign { TEXT_ALIGN_LEFT, TEXT_ALIGN_RIGHT, TEXT_ALIGN_CENTER, TEXT_ALIGN_JUSTIFY, TEXT_ALIGN_START, TEXT_ALIGN_END } |
Enumerates text alignment modes. |
| OH_Drawing_FontWeight { FONT_WEIGHT_100, FONT_WEIGHT_200, FONT_WEIGHT_300, FONT_WEIGHT_400, FONT_WEIGHT_500, FONT_WEIGHT_600, FONT_WEIGHT_700, FONT_WEIGHT_800, FONT_WEIGHT_900 } |
Enumerates font weights. |
| OH_Drawing_TextBaseline { TEXT_BASELINE_ALPHABETIC, TEXT_BASELINE_IDEOGRAPHIC } | Enumerates text baselines. |
| OH_Drawing_TextDecoration { TEXT_DECORATION_NONE = 0x0, TEXT_DECORATION_UNDERLINE = 0x1, TEXT_DECORATION_OVERLINE = 0x2, TEXT_DECORATION_LINE_THROUGH = 0x4 } | Enumerates text decorations. |
| OH_Drawing_FontStyle { FONT_STYLE_NORMAL, FONT_STYLE_ITALIC } | Enumerates font styles. |
| OH_Drawing_ColorFormat { COLOR_FORMAT_UNKNOWN, COLOR_FORMAT_ALPHA_8, COLOR_FORMAT_RGB_565, COLOR_FORMAT_ARGB_4444, COLOR_FORMAT_RGBA_8888, COLOR_FORMAT_BGRA_8888 } |
Enumerates storage formats of bitmap pixels. |
| OH_Drawing_AlphaFormat { ALPHA_FORMAT_UNKNOWN, ALPHA_FORMAT_OPAQUE, ALPHA_FORMAT_PREMUL, ALPHA_FORMAT_UNPREMUL } | Enumerates alpha formats of bitmap pixels. |
Functions
| Name | Description |
|---|---|
| OH_Drawing_BitmapCreate (void) | Creates an OH_Drawing_Bitmap object. |
| OH_Drawing_BitmapDestroy (OH_Drawing_Bitmap *) | Destroys an OH_Drawing_Bitmap object and reclaims the memory occupied by the object. |
| OH_Drawing_BitmapBuild (OH_Drawing_Bitmap *, const uint32_t width, const uint32_t height, const OH_Drawing_BitmapFormat *) | Initializes the width and height of an OH_Drawing_Bitmap object and sets the pixel format for the bitmap. |
| OH_Drawing_BitmapGetWidth (OH_Drawing_Bitmap *) | Obtains the width of a bitmap. |
| OH_Drawing_BitmapGetHeight (OH_Drawing_Bitmap *) | Obtains the height of a bitmap. |
| OH_Drawing_BitmapGetPixels (OH_Drawing_Bitmap *) | Obtains the pixel address of a bitmap. You can use this address to obtain the pixel data of the bitmap. |
| OH_Drawing_BrushCreate (void) | Creates an OH_Drawing_Brush object. |
| OH_Drawing_BrushDestroy (OH_Drawing_Brush *) | Destroys an OH_Drawing_Brush object and reclaims the memory occupied by the object. |
| OH_Drawing_BrushIsAntiAlias (const OH_Drawing_Brush *) | Checks whether anti-aliasing is enabled for a brush. If anti-aliasing is enabled, edges will be drawn with partial transparency. |
| OH_Drawing_BrushSetAntiAlias (OH_Drawing_Brush *, bool) | Enables or disables anti-aliasing for a brush. If anti-aliasing is enabled, edges will be drawn with partial transparency. |
| OH_Drawing_BrushGetColor (const OH_Drawing_Brush *) | Obtains the color of a brush. The color is used by the brush to fill in a shape. |
| OH_Drawing_BrushSetColor (OH_Drawing_Brush *, uint32_t color) | Sets the color for a brush. The color will be used by the brush to fill in a shape. |
| OH_Drawing_CanvasCreate (void) | Creates an OH_Drawing_Canvas object. |
| OH_Drawing_CanvasDestroy (OH_Drawing_Canvas *) | Destroys an OH_Drawing_Canvas object and reclaims the memory occupied by the object. |
| OH_Drawing_CanvasBind (OH_Drawing_Canvas *, OH_Drawing_Bitmap *) | Binds a bitmap to a canvas so that the content drawn on the canvas is output to the bitmap (this process is called CPU rendering). |
| OH_Drawing_CanvasAttachPen (OH_Drawing_Canvas *, const OH_Drawing_Pen *) | Attaches a pen to a canvas so that the canvas will use the style and color of the pen to outline a shape. |
| OH_Drawing_CanvasDetachPen (OH_Drawing_Canvas *) | Detaches the pen from a canvas so that the canvas will not use the style and color of the pen to outline a shape. |
| OH_Drawing_CanvasAttachBrush (OH_Drawing_Canvas *, const OH_Drawing_Brush *) | Attaches a brush to a canvas so that the canvas will use the style and color of the brush to fill in a shape. |
| OH_Drawing_CanvasDetachBrush (OH_Drawing_Canvas *) | Detaches the brush from a canvas so that the canvas will not use the style and color of the brush to fill in a shape. |
| OH_Drawing_CanvasSave (OH_Drawing_Canvas *) | Saves the current canvas status (canvas matrix) to the top of the stack. |
| OH_Drawing_CanvasRestore (OH_Drawing_Canvas *) | Restores the canvas status (canvas matrix) saved on the top of the stack. |
| OH_Drawing_CanvasDrawLine (OH_Drawing_Canvas *, float x1, float y1, float x2, float y2) | Draws a line segment. |
| OH_Drawing_CanvasDrawPath (OH_Drawing_Canvas *, const OH_Drawing_Path *) | Draws a path. |
| OH_Drawing_CanvasClear (OH_Drawing_Canvas *, uint32_t color) | Clears a canvas by using a specified color. |
| OH_Drawing_ColorSetArgb (uint32_t alpha, uint32_t red, uint32_t green, uint32_t blue) | Converts four variables (alpha, red, green, and blue) into a 32-bit (ARGB) variable that describes a color. |
| OH_Drawing_CreateFontCollection (void) | Creates an OH_Drawing_FontCollection object. |
| OH_Drawing_DestroyFontCollection (OH_Drawing_FontCollection *) | Releases the memory occupied by an OH_Drawing_FontCollection object. |
| OH_Drawing_PathCreate (void) | Creates an OH_Drawing_Path object. |
| OH_Drawing_PathDestroy (OH_Drawing_Path *) | Destroys an OH_Drawing_Path object and reclaims the memory occupied by the object. |
| OH_Drawing_PathMoveTo (OH_Drawing_Path *, float x, float y) | Sets the start point of a path. |
| OH_Drawing_PathLineTo (OH_Drawing_Path *, float x, float y) | Draws a line segment from the last point of a path to the target point. |
| OH_Drawing_PathArcTo (OH_Drawing_Path *, float x1, float y1, float x2, float y2, float startDeg, float sweepDeg) | Draws an arc to a path. This is done by using angle arc mode. In this mode, a rectangle that encloses an ellipse is specified first, and then a start angle and a sweep angle are specified. The arc is a portion of the ellipse defined by the start angle and the sweep angle. By default, a line segment from the last point of the path to the start point of the arc is also added. |
| OH_Drawing_PathQuadTo (OH_Drawing_Path *, float ctrlX, float ctrlY, float endX, float endY) | Draws a quadratic Bezier curve from the last point of a path to the target point. |
| OH_Drawing_PathCubicTo (OH_Drawing_Path *, float ctrlX1, float ctrlY1, float ctrlX2, float ctrlY2, float endX, float endY) | Draws a cubic Bezier curve from the last point of a path to the target point. |
| OH_Drawing_PathClose (OH_Drawing_Path *) | Closes a path. A line segment from the start point to the last point of the path is added. |
| OH_Drawing_PathReset (OH_Drawing_Path *) | Resets path data. |
| OH_Drawing_PenCreate (void) | Creates an OH_Drawing_Pen object. |
| OH_Drawing_PenDestroy (OH_Drawing_Pen *) | Destroys an OH_Drawing_Pen object and reclaims the memory occupied by the object. |
| OH_Drawing_PenIsAntiAlias (const OH_Drawing_Pen *) | Checks whether anti-aliasing is enabled for a pen. If anti-aliasing is enabled, edges will be drawn with partial transparency. |
| OH_Drawing_PenSetAntiAlias (OH_Drawing_Pen *, bool) | Enables or disables anti-aliasing for a pen. If anti-aliasing is enabled, edges will be drawn with partial transparency. |
| OH_Drawing_PenGetColor (const OH_Drawing_Pen *) | Obtains the color of a pen. The color is used by the pen to outline a shape. |
| OH_Drawing_PenSetColor (OH_Drawing_Pen *, uint32_t color) | Sets the color for a pen. The color is used by the pen to outline a shape. |
| OH_Drawing_PenGetWidth (const OH_Drawing_Pen *) | Obtains the thickness of a pen. This thickness determines the width of the outline of a shape. |
| OH_Drawing_PenSetWidth (OH_Drawing_Pen *, float width) | Sets the thickness for a pen. This thickness determines the width of the outline of a shape. |
| OH_Drawing_PenGetMiterLimit (const OH_Drawing_Pen *) | Obtains the stroke miter limit of a polyline drawn by a pen. When the corner type is bevel, a beveled corner is displayed if the miter limit is exceeded, and a mitered corner is displayed if the miter limit is not exceeded. |
| OH_Drawing_PenSetMiterLimit (OH_Drawing_Pen *, float miter) | Sets the stroke miter limit for a polyline drawn by a pen. When the corner type is bevel, a beveled corner is displayed if the miter limit is exceeded, and a mitered corner is displayed if the miter limit is not exceeded. |
| OH_Drawing_PenGetCap (const OH_Drawing_Pen *) | Obtains the line cap style of a pen. |
| OH_Drawing_PenSetCap (OH_Drawing_Pen *, OH_Drawing_PenLineCapStyle) | Sets the line cap style for a pen. |
| OH_Drawing_PenGetJoin (const OH_Drawing_Pen *) | Obtains the line join style of a pen. |
| OH_Drawing_PenSetJoin (OH_Drawing_Pen *, OH_Drawing_PenLineJoinStyle) | Sets the line join style for a pen. |
| OH_Drawing_CreateTypographyStyle (void) | Creates an OH_Drawing_TypographyStyle object. |
| OH_Drawing_DestroyTypographyStyle (OH_Drawing_TypographyStyle *) | Releases the memory occupied by an OH_Drawing_TypographyStyle object. |
| OH_Drawing_SetTypographyTextDirection (OH_Drawing_TypographyStyle *, int) | Sets the text direction. |
| OH_Drawing_SetTypographyTextAlign (OH_Drawing_TypographyStyle *, int) | Sets the text alignment mode. |
| OH_Drawing_SetTypographyTextMaxLines (OH_Drawing_TypographyStyle *, int) | Sets the maximum number of lines in a text file. |
| OH_Drawing_CreateTextStyle (void) | Creates an OH_Drawing_TextStyle object. |
| OH_Drawing_DestroyTextStyle (OH_Drawing_TextStyle *) | Releases the memory occupied by an OH_Drawing_TextStyle object. |
| OH_Drawing_SetTextStyleColor (OH_Drawing_TextStyle *, uint32_t) | Sets the text color. |
| OH_Drawing_SetTextStyleFontSize (OH_Drawing_TextStyle *, double) | Sets the font size. |
| OH_Drawing_SetTextStyleFontWeight (OH_Drawing_TextStyle *, int) | Sets the font weight. |
| OH_Drawing_SetTextStyleBaseLine (OH_Drawing_TextStyle *, int) | Sets the text baseline. |
| OH_Drawing_SetTextStyleDecoration (OH_Drawing_TextStyle *, int) | Sets the text decoration. |
| OH_Drawing_SetTextStyleDecorationColor (OH_Drawing_TextStyle *, uint32_t) | Sets the color for the text decoration. |
| OH_Drawing_SetTextStyleFontHeight (OH_Drawing_TextStyle *, double) | Sets the font height. |
| OH_Drawing_SetTextStyleFontFamilies (OH_Drawing_TextStyle *, int, const char *fontFamilies[]) | Sets the font families. |
| OH_Drawing_SetTextStyleFontStyle (OH_Drawing_TextStyle *, int) | Sets the font style. |
| OH_Drawing_SetTextStyleLocale (OH_Drawing_TextStyle *, const char *) | Sets the locale. |
| OH_Drawing_CreateTypographyHandler (OH_Drawing_TypographyStyle *, OH_Drawing_FontCollection *) | Creates a pointer to an OH_Drawing_TypographyCreate object. |
| OH_Drawing_DestroyTypographyHandler (OH_Drawing_TypographyCreate *) | Releases the memory occupied by an OH_Drawing_TypographyCreate object. |
| OH_Drawing_TypographyHandlerPushTextStyle (OH_Drawing_TypographyCreate *, OH_Drawing_TextStyle *) | Sets the text style. |
| OH_Drawing_TypographyHandlerAddText (OH_Drawing_TypographyCreate *, const char *) | Sets the text content. |
| OH_Drawing_TypographyHandlerPopTextStyle (OH_Drawing_TypographyCreate *) | Removes the topmost style in the stack, leaving the remaining styles in effect. |
| OH_Drawing_CreateTypography (OH_Drawing_TypographyCreate *) | Creates an OH_Drawing_Typography object. |
| OH_Drawing_DestroyTypography (OH_Drawing_Typography *) | Releases the memory occupied by an OH_Drawing_Typography object. |
| OH_Drawing_TypographyLayout (OH_Drawing_Typography *, double) | Lays out the typography. |
| OH_Drawing_TypographyPaint (OH_Drawing_Typography *, OH_Drawing_Canvas *, double, double) | Paints text on the canvas. |
| OH_Drawing_TypographyGetMaxWidth (OH_Drawing_Typography *) | Obtains the maximum width. |
| OH_Drawing_TypographyGetHeight (OH_Drawing_Typography *) | Obtains the height. |
| OH_Drawing_TypographyGetLongestLine (OH_Drawing_Typography *) | Obtains the longest line. |
| OH_Drawing_TypographyGetMinIntrinsicWidth (OH_Drawing_Typography *) | Obtains the minimum intrinsic width. |
| OH_Drawing_TypographyGetMaxIntrinsicWidth (OH_Drawing_Typography *) | Obtains the maximum intrinsic width. |
| OH_Drawing_TypographyGetAlphabeticBaseline (OH_Drawing_Typography *) | Obtains the alphabetic baseline. |
| OH_Drawing_TypographyGetIdeographicBaseline (OH_Drawing_Typography *) | Obtains the ideographic baseline. |
Type Description
OH_Drawing_Bitmap
typedef struct OH_Drawing_BitmapOH_Drawing_Bitmap
Description
Defines a bitmap, which is a memory that contains the pixel data of a shape.
OH_Drawing_Brush
typedef struct OH_Drawing_BrushOH_Drawing_Brush
Description
Defines as a brush, which is used to describe the style and color to fill in a shape.
OH_Drawing_Canvas
typedef struct OH_Drawing_CanvasOH_Drawing_Canvas
Description
Defines a rectangular canvas on which various shapes, images, and texts can be drawn by using the brush and pen.
OH_Drawing_FontCollection
typedef struct OH_Drawing_FontCollectionOH_Drawing_FontCollection
Description
Defines an OH_Drawing_FontCollection, which is used to load fonts.
OH_Drawing_Path
typedef struct OH_Drawing_PathOH_Drawing_Path
Description
Defines a path, which is used to customize various shapes.
OH_Drawing_Pen
typedef struct OH_Drawing_PenOH_Drawing_Pen
Description
Defines a pen, which is used to describe the style and color to outline a shape.
OH_Drawing_TextStyle
typedef struct OH_Drawing_TextStyleOH_Drawing_TextStyle
Description
Defines an OH_Drawing_TextStyle, which is used to manage text colors and decorations.
OH_Drawing_Typography
typedef struct OH_Drawing_TypographyOH_Drawing_Typography
Description
Defines an OH_Drawing_Typography, which is used to manage the typography layout and display.
OH_Drawing_TypographyCreate
typedef struct OH_Drawing_TypographyCreateOH_Drawing_TypographyCreate
Description
Defines an OH_Drawing_TypographyCreate, which is used to create an OH_Drawing_Typography object.
OH_Drawing_TypographyStyle
typedef struct OH_Drawing_TypographyStyleOH_Drawing_TypographyStyle
Description
Defines an OH_Drawing_TypographyStyle, which is used to manage the typography style, such as the text direction.
Enum Description
OH_Drawing_AlphaFormat
enum OH_Drawing_AlphaFormat
Description
Enumerates alpha formats of bitmap pixels.
| Name | Description |
|---|---|
| ALPHA_FORMAT_UNKNOWN | Unknown format. |
| ALPHA_FORMAT_OPAQUE | The bitmap does not have the alpha component. |
| ALPHA_FORMAT_PREMUL | The color component of each pixel is premultiplied by the alpha component. |
| ALPHA_FORMAT_UNPREMUL | The color component of each pixel is not premultiplied by the alpha component. |
OH_Drawing_ColorFormat
enum OH_Drawing_ColorFormat
Description
Enumerates storage formats of bitmap pixels.
| Name | Description |
|---|---|
| COLOR_FORMAT_UNKNOWN | Unknown format. |
| COLOR_FORMAT_ALPHA_8 | Each pixel is represented by 8 bits, which together indicate alpha. |
| COLOR_FORMAT_RGB_565 | Each pixel is represented by 16 bits. From the most significant bit to the least significant bit, the first 5 bits indicate red, the subsequent 6 bits indicate green, and the last 5 bits indicate blue. |
| COLOR_FORMAT_ARGB_4444 | Each pixel is represented by 16 bits. From the most significant bit to the least significant bit, every 4 bits indicate alpha, red, green, and blue, respectively. |
| COLOR_FORMAT_RGBA_8888 | Each pixel is represented by 32 bits. From the most significant bit to the least significant bit, every 8 bits indicate alpha, red, green, and blue, respectively. |
| COLOR_FORMAT_BGRA_8888 | Each pixel is represented by 32 bits. From the most significant bit to the least significant bit, every 8 bits indicate blue, green, red, and alpha, respectively. |
OH_Drawing_FontStyle
enum OH_Drawing_FontStyle
Description
Enumerates font styles.
| Name | Description |
|---|---|
| FONT_STYLE_NORMAL | Normal style |
| FONT_STYLE_ITALIC | Italic style |
OH_Drawing_FontWeight
enum OH_Drawing_FontWeight
Description
Enumerates font weights.
| Name | Description |
|---|---|
| FONT_WEIGHT_100 | Thin |
| FONT_WEIGHT_200 | Extra-light |
| FONT_WEIGHT_300 | Light |
| FONT_WEIGHT_400 | Normal/Regular |
| FONT_WEIGHT_500 | Medium |
| FONT_WEIGHT_600 | Semi-bold |
| FONT_WEIGHT_700 | Bold |
| FONT_WEIGHT_800 | Extra-bold |
| FONT_WEIGHT_900 | Black |
OH_Drawing_PenLineCapStyle
enum OH_Drawing_PenLineCapStyle
Description
Enumerates line cap styles of a pen. The line cap style defines the style of both ends of a line segment drawn by the pen.
| Name | Description |
|---|---|
| LINE_FLAT_CAP | There is no cap style. Both ends of the line segment are cut off square. |
| LINE_SQUARE_CAP | Square cap style. Both ends have a square, the height of which is half of the width of the line segment, with the same width. |
| LINE_ROUND_CAP | Round cap style. Both ends have a semicircle centered, the diameter of which is the same as the width of the line segment. |
OH_Drawing_PenLineJoinStyle
enum OH_Drawing_PenLineJoinStyle
Description
Enumerates pen line join styles. The line join style defines the shape of the joints of a polyline segment drawn by the pen.
| Name | Description |
|---|---|
| LINE_MITER_JOIN | Mitered corner. If the angle of a polyline is small, its miter length may be inappropriate. In this case, you need to use the miter limit to limit the miter length. |
| LINE_ROUND_JOIN | Round corner. |
| LINE_BEVEL_JOIN | Beveled corner. |
OH_Drawing_TextAlign
enum OH_Drawing_TextAlign
Description
Enumerates text alignment modes.
| Name | Description |
|---|---|
| TEXT_ALIGN_LEFT | Left-aligned |
| TEXT_ALIGN_RIGHT | Right-aligned |
| TEXT_ALIGN_CENTER | Center-aligned |
| TEXT_ALIGN_JUSTIFY | Justified, which means that each line (except the last line) is stretched so that every line has equal width, and the left and right margins are straight. |
| TEXT_ALIGN_START | TEXT_ALIGN_START achieves the same effect as TEXT_ALIGN_LEFT when OH_Drawing_TextDirection is TEXT_DIRECTION_LTR; it achieves the same effect as TEXT_ALIGN_RIGHT when OH_Drawing_TextDirection is TEXT_DIRECTION_RTL. |
| TEXT_ALIGN_END | TEXT_ALIGN_END achieves the same effect as TEXT_ALIGN_RIGHT when OH_Drawing_TextDirection is TEXT_DIRECTION_LTR; it achieves the same effect as TEXT_ALIGN_LEFT when OH_Drawing_TextDirection is TEXT_DIRECTION_RTL. |
OH_Drawing_TextBaseline
enum OH_Drawing_TextBaseline
Description
Enumerates text baselines.
| Name | Description |
|---|---|
| TEXT_BASELINE_ALPHABETIC | Alphabetic, where the letters in alphabets like English sit on. |
| TEXT_BASELINE_IDEOGRAPHIC | Ideographic. The baseline is at the bottom of the text area. |
OH_Drawing_TextDecoration
enum OH_Drawing_TextDecoration
Description
Enumerates text decorations.
| Name | Description |
|---|---|
| TEXT_DECORATION_NONE | No decoration. |
| TEXT_DECORATION_UNDERLINE | A underline is used for decoration. |
| TEXT_DECORATION_OVERLINE | An overline is used for decoration. |
| TEXT_DECORATION_LINE_THROUGH | A strikethrough is used for decoration. |
OH_Drawing_TextDirection
enum OH_Drawing_TextDirection
Description
Enumerates text directions.
| Name | Description |
|---|---|
| TEXT_DIRECTION_RTL | Right to left (RTL) |
| TEXT_DIRECTION_LTR | Left to right (LTR) |
Function Description
OH_Drawing_BitmapBuild()
void OH_Drawing_BitmapBuild (OH_Drawing_Bitmap * , const uint32_t width, const uint32_t height, const OH_Drawing_BitmapFormat * )
Description
Initializes the width and height of an OH_Drawing_Bitmap object and sets the pixel format for the bitmap.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Bitmap | Indicates the pointer to an OH_Drawing_Bitmap object. |
| width | Indicates the width of the bitmap to be initialized. |
| height | Indicates the height of the bitmap to be initialized. |
| OH_Drawing_BitmapFormat | Indicates the pixel format of the bitmap to be initialized, including the pixel color type and alpha type. |
OH_Drawing_BitmapCreate()
OH_Drawing_Bitmap* OH_Drawing_BitmapCreate (void )
Description
Creates an OH_Drawing_Bitmap object.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Returns
Returns the pointer to the OH_Drawing_Bitmap object created.
OH_Drawing_BitmapDestroy()
void OH_Drawing_BitmapDestroy (OH_Drawing_Bitmap * )
Description
Destroys an OH_Drawing_Bitmap object and reclaims the memory occupied by the object.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Bitmap | Indicates the pointer to an OH_Drawing_Bitmap object. |
OH_Drawing_BitmapGetHeight()
uint32_t OH_Drawing_BitmapGetHeight (OH_Drawing_Bitmap * )
Description
Obtains the height of a bitmap.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Bitmap | Indicates the pointer to an OH_Drawing_Bitmap object. |
Returns
Returns the height.
OH_Drawing_BitmapGetPixels()
void* OH_Drawing_BitmapGetPixels (OH_Drawing_Bitmap * )
Description
Obtains the pixel address of a bitmap. You can use this address to obtain the pixel data of the bitmap.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Bitmap | Indicates the pointer to an OH_Drawing_Bitmap object. |
Returns
Returns the pixel address.
OH_Drawing_BitmapGetWidth()
uint32_t OH_Drawing_BitmapGetWidth (OH_Drawing_Bitmap * )
Description
Obtains the width of a bitmap.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Bitmap | Indicates the pointer to an OH_Drawing_Bitmap object. |
Returns
Returns the width.
OH_Drawing_BrushCreate()
OH_Drawing_Brush* OH_Drawing_BrushCreate (void )
Description
Creates an OH_Drawing_Brush object.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Returns
Returns the pointer to the OH_Drawing_Brush object created.
OH_Drawing_BrushDestroy()
void OH_Drawing_BrushDestroy (OH_Drawing_Brush * )
Description
Destroys an OH_Drawing_Brush object and reclaims the memory occupied by the object.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Brush | Indicates the pointer to an OH_Drawing_Brush object. |
OH_Drawing_BrushGetColor()
uint32_t OH_Drawing_BrushGetColor (const OH_Drawing_Brush * )
Description
Obtains the color of a brush. The color is used by the brush to fill in a shape.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Brush | Indicates the pointer to an OH_Drawing_Brush object. |
Returns
Returns a 32-bit (ARGB) variable that describes the color.
OH_Drawing_BrushIsAntiAlias()
bool OH_Drawing_BrushIsAntiAlias (const OH_Drawing_Brush * )
Description
Checks whether anti-aliasing is enabled for a brush. If anti-aliasing is enabled, edges will be drawn with partial transparency.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Brush | Indicates the pointer to an OH_Drawing_Brush object. |
Returns
Returns true if anti-aliasing is enabled; returns false otherwise.
OH_Drawing_BrushSetAntiAlias()
void OH_Drawing_BrushSetAntiAlias (OH_Drawing_Brush * , bool )
Description
Enables or disables anti-aliasing for a brush. If anti-aliasing is enabled, edges will be drawn with partial transparency.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Brush | Indicates the pointer to an OH_Drawing_Brush object. |
| bool | Specifies whether to enable anti-aliasing. The value true means to enable anti-aliasing, and false means the opposite. |
OH_Drawing_BrushSetColor()
void OH_Drawing_BrushSetColor (OH_Drawing_Brush * , uint32_t color )
Description
Sets the color for a brush. The color will be used by the brush to fill in a shape.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Brush | Indicates the pointer to an OH_Drawing_Brush object. |
| color | Indicates the color to set, which is a 32-bit (ARGB) variable. |
OH_Drawing_CanvasAttachBrush()
void OH_Drawing_CanvasAttachBrush (OH_Drawing_Canvas * , const OH_Drawing_Brush * )
Description
Attaches a brush to a canvas so that the canvas will use the style and color of the brush to fill in a shape.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Canvas | Indicates the pointer to an OH_Drawing_Canvas object. |
| OH_Drawing_Brush | Indicates the pointer to an OH_Drawing_Brush object. |
OH_Drawing_CanvasAttachPen()
void OH_Drawing_CanvasAttachPen (OH_Drawing_Canvas * , const OH_Drawing_Pen * )
Description
Attaches a pen to a canvas so that the canvas will use the style and color of the pen to outline a shape.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Canvas | Indicates the pointer to an OH_Drawing_Canvas object. |
| OH_Drawing_Pen | Indicates the pointer to an OH_Drawing_Pen object. |
OH_Drawing_CanvasBind()
void OH_Drawing_CanvasBind (OH_Drawing_Canvas * , OH_Drawing_Bitmap * )
Description
Binds a bitmap to a canvas so that the content drawn on the canvas is output to the bitmap (this process is called CPU rendering).
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Canvas | Indicates the pointer to an OH_Drawing_Canvas object. |
| OH_Drawing_Bitmap | Indicates the pointer to an OH_Drawing_Bitmap object. |
OH_Drawing_CanvasClear()
void OH_Drawing_CanvasClear (OH_Drawing_Canvas * , uint32_t color )
Description
Clears a canvas by using a specified color.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Canvas | Indicates the pointer to an OH_Drawing_Canvas object. |
| color | Indicates the color, which is a 32-bit (ARGB) variable. |
OH_Drawing_CanvasCreate()
OH_Drawing_Canvas* OH_Drawing_CanvasCreate (void )
Description
Creates an OH_Drawing_Canvas object.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Returns
Returns the pointer to the OH_Drawing_Canvas object created.
OH_Drawing_CanvasDestroy()
void OH_Drawing_CanvasDestroy (OH_Drawing_Canvas * )
Description
Destroys an OH_Drawing_Canvas object and reclaims the memory occupied by the object.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Canvas | Indicates the pointer to an OH_Drawing_Canvas object. |
OH_Drawing_CanvasDetachBrush()
void OH_Drawing_CanvasDetachBrush (OH_Drawing_Canvas * )
Description
Detaches the brush from a canvas so that the canvas will not use the style and color of the brush to fill in a shape.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Canvas | Indicates the pointer to an OH_Drawing_Canvas object. |
OH_Drawing_CanvasDetachPen()
void OH_Drawing_CanvasDetachPen (OH_Drawing_Canvas * )
Description
Detaches the pen from a canvas so that the canvas will not use the style and color of the pen to outline a shape.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Canvas | Indicates the pointer to an OH_Drawing_Canvas object. |
OH_Drawing_CanvasDrawLine()
void OH_Drawing_CanvasDrawLine (OH_Drawing_Canvas * , float x1, float y1, float x2, float y2 )
Description
Draws a line segment.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Canvas | Indicates the pointer to an OH_Drawing_Canvas object. |
| x1 | Indicates the x coordinate of the start point of the line segment. |
| y1 | Indicates the y coordinate of the start point of the line segment. |
| x2 | Indicates the x coordinate of the end point of the line segment. |
| y2 | Indicates the y coordinate of the end point of the line segment. |
OH_Drawing_CanvasDrawPath()
void OH_Drawing_CanvasDrawPath (OH_Drawing_Canvas * , const OH_Drawing_Path * )
Description
Draws a path.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Canvas | Indicates the pointer to an OH_Drawing_Canvas object. |
| OH_Drawing_Path | Indicates the pointer to an OH_Drawing_Path object. |
OH_Drawing_CanvasRestore()
void OH_Drawing_CanvasRestore (OH_Drawing_Canvas * )
Description
Restores the canvas status (canvas matrix) saved on the top of the stack.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Canvas | Indicates the pointer to an OH_Drawing_Canvas object. |
OH_Drawing_CanvasSave()
void OH_Drawing_CanvasSave (OH_Drawing_Canvas * )
Description
Saves the current canvas status (canvas matrix) to the top of the stack.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Canvas | Indicates the pointer to an OH_Drawing_Canvas object. |
OH_Drawing_ColorSetArgb()
uint32_t OH_Drawing_ColorSetArgb (uint32_t alpha, uint32_t red, uint32_t green, uint32_t blue )
Description
Converts four variables (alpha, red, green, and blue) into a 32-bit (ARGB) variable that describes a color.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| alpha | Indicates a variable that describes alpha. The value ranges from 0x00 to 0xFF. |
| red | Indicates a variable that describes red. The value ranges from 0x00 to 0xFF. |
| green | Indicates a variable that describes green. The value ranges from 0x00 to 0xFF. |
| blue | Indicates a variable that describes blue. The value ranges from 0x00 to 0xFF. |
Returns
Returns a 32-bit (ARGB) variable that describes the color.
OH_Drawing_CreateFontCollection()
OH_Drawing_FontCollection* OH_Drawing_CreateFontCollection (void )
Description
Creates an OH_Drawing_FontCollection object.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Returns
Returns the pointer to the OH_Drawing_FontCollection object created.
OH_Drawing_CreateTextStyle()
OH_Drawing_TextStyle* OH_Drawing_CreateTextStyle (void )
Description
Creates an OH_Drawing_TextStyle object.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Returns
Returns the pointer to the OH_Drawing_TextStyle object created.
OH_Drawing_CreateTypography()
OH_Drawing_Typography* OH_Drawing_CreateTypography (OH_Drawing_TypographyCreate * )
Description
Creates an OH_Drawing_Typography object.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_TypographyCreate | Indicates the pointer to an OH_Drawing_TypographyCreate object. |
Returns
Returns the pointer to the OH_Drawing_Typography object created.
OH_Drawing_CreateTypographyHandler()
OH_Drawing_TypographyCreate* OH_Drawing_CreateTypographyHandler (OH_Drawing_TypographyStyle * , OH_Drawing_FontCollection * )
Description
Creates a pointer to an OH_Drawing_TypographyCreate object.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_TypographyStyle | Indicates the pointer to an OH_Drawing_TypographyStyle object. |
| OH_Drawing_FontCollection | Indicates the pointer to an OH_Drawing_FontCollection object. |
Returns
Returns the pointer to the OH_Drawing_TypographyCreate object created.
OH_Drawing_CreateTypographyStyle()
OH_Drawing_TypographyStyle* OH_Drawing_CreateTypographyStyle (void )
Description
Creates an OH_Drawing_TypographyStyle object.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Returns
Returns the pointer to the OH_Drawing_TypographyStyle object created.
OH_Drawing_DestroyFontCollection()
void OH_Drawing_DestroyFontCollection (OH_Drawing_FontCollection * )
Description
Releases the memory occupied by an OH_Drawing_FontCollection object.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_FontCollection | Indicates the pointer to an OH_Drawing_FontCollection object. |
OH_Drawing_DestroyTextStyle()
void OH_Drawing_DestroyTextStyle (OH_Drawing_TextStyle * )
Description
Releases the memory occupied by an OH_Drawing_TextStyle object.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_TextStyle | Indicates the pointer to an OH_Drawing_TextStyle object. |
OH_Drawing_DestroyTypography()
void OH_Drawing_DestroyTypography (OH_Drawing_Typography * )
Description
Releases the memory occupied by an OH_Drawing_Typography object.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Typography | Indicates the pointer to an OH_Drawing_Typography object. |
OH_Drawing_DestroyTypographyHandler()
void OH_Drawing_DestroyTypographyHandler (OH_Drawing_TypographyCreate * )
Description
Releases the memory occupied by an OH_Drawing_TypographyCreate object.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_TypographyCreate | Indicates the pointer to an OH_Drawing_TypographyCreate object. |
OH_Drawing_DestroyTypographyStyle()
void OH_Drawing_DestroyTypographyStyle (OH_Drawing_TypographyStyle * )
Description
Releases the memory occupied by an OH_Drawing_TypographyStyle object.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_TypographyStyle | Indicates the pointer to an OH_Drawing_TypographyStyle object. |
OH_Drawing_PathArcTo()
void OH_Drawing_PathArcTo (OH_Drawing_Path * , float x1, float y1, float x2, float y2, float startDeg, float sweepDeg )
Description
Draws an arc to a path. This is done by using angle arc mode. In this mode, a rectangle that encloses an ellipse is specified first, and then a start angle and a sweep angle are specified. The arc is a portion of the ellipse defined by the start angle and the sweep angle. By default, a line segment from the last point of the path to the start point of the arc is also added.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Path | Indicates the pointer to an OH_Drawing_Path object. |
| x1 | Indicates the x coordinate of the upper left corner of the rectangle. |
| y1 | Indicates the y coordinate of the upper left corner of the rectangle. |
| x2 | Indicates the x coordinate of the lower right corner of the rectangle. |
| y2 | Indicates the y coordinate of the lower right corner of the rectangle. |
| startDeg | Indicates the start angle, in degrees. |
| sweepDeg | Indicates the angle to sweep, in degrees. |
OH_Drawing_PathClose()
void OH_Drawing_PathClose (OH_Drawing_Path * )
Description
Closes a path. A line segment from the start point to the last point of the path is added.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Path | Indicates the pointer to an OH_Drawing_Path object. |
OH_Drawing_PathCreate()
OH_Drawing_Path* OH_Drawing_PathCreate (void )
Description
Creates an OH_Drawing_Path object.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Returns
Returns the pointer to the OH_Drawing_Path object created.
OH_Drawing_PathCubicTo()
void OH_Drawing_PathCubicTo (OH_Drawing_Path * , float ctrlX1, float ctrlY1, float ctrlX2, float ctrlY2, float endX, float endY )
Description
Draws a cubic Bezier curve from the last point of a path to the target point.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Path | Indicates the pointer to an OH_Drawing_Path object. |
| ctrlX1 | Indicates the x coordinate of the first control point. |
| ctrlY1 | Indicates the y coordinate of the first control point. |
| ctrlX2 | Indicates the x coordinate of the second control point. |
| ctrlY2 | Indicates the y coordinate of the second control point. |
| endX | Indicates the x coordinate of the target point. |
| endY | Indicates the y coordinate of the target point. |
OH_Drawing_PathDestroy()
void OH_Drawing_PathDestroy (OH_Drawing_Path * )
Description
Destroys an OH_Drawing_Path object and reclaims the memory occupied by the object.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Path | Indicates the pointer to an OH_Drawing_Path object. |
OH_Drawing_PathLineTo()
void OH_Drawing_PathLineTo (OH_Drawing_Path * , float x, float y )
Description
Draws a line segment from the last point of a path to the target point.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Path | Indicates the pointer to an OH_Drawing_Path object. |
| x | Indicates the x coordinate of the target point. |
| y | Indicates the y coordinate of the target point. |
OH_Drawing_PathMoveTo()
void OH_Drawing_PathMoveTo (OH_Drawing_Path * , float x, float y )
Description
Sets the start point of a path.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Path | Indicates the pointer to an OH_Drawing_Path object. |
| x | Indicates the x coordinate of the start point. |
| y | Indicates the y coordinate of the start point. |
OH_Drawing_PathQuadTo()
void OH_Drawing_PathQuadTo (OH_Drawing_Path * , float ctrlX, float ctrlY, float endX, float endY )
Description
Draws a quadratic Bezier curve from the last point of a path to the target point.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Path | Indicates the pointer to an OH_Drawing_Path object. |
| ctrlX | Indicates the x coordinate of the control point. |
| ctrlY | Indicates the y coordinate of the control point. |
| endX | Indicates the x coordinate of the target point. |
| endY | Indicates the y coordinate of the target point. |
OH_Drawing_PathReset()
void OH_Drawing_PathReset (OH_Drawing_Path * )
Description
Resets path data.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Path | Indicates the pointer to an OH_Drawing_Path object. |
OH_Drawing_PenCreate()
OH_Drawing_Pen* OH_Drawing_PenCreate (void )
Description
Creates an OH_Drawing_Pen object.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Returns
Returns the pointer to the OH_Drawing_Pen object created.
OH_Drawing_PenDestroy()
void OH_Drawing_PenDestroy (OH_Drawing_Pen * )
Description
Destroys an OH_Drawing_Pen object and reclaims the memory occupied by the object.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Pen | Indicates the pointer to an OH_Drawing_Pen object. |
OH_Drawing_PenGetCap()
OH_Drawing_PenLineCapStyle OH_Drawing_PenGetCap (const OH_Drawing_Pen * )
Description
Obtains the line cap style of a pen.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Pen | Indicates the pointer to an OH_Drawing_Pen object. |
Returns
Returns the line cap style.
OH_Drawing_PenGetColor()
uint32_t OH_Drawing_PenGetColor (const OH_Drawing_Pen * )
Description
Obtains the color of a pen. The color is used by the pen to outline a shape.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Pen | Indicates the pointer to an OH_Drawing_Pen object. |
Returns
Returns a 32-bit (ARGB) variable that describes the color.
OH_Drawing_PenGetJoin()
OH_Drawing_PenLineJoinStyle OH_Drawing_PenGetJoin (const OH_Drawing_Pen * )
Description
Obtains the line join style of a pen.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Pen | Indicates the pointer to an OH_Drawing_Pen object. |
Returns
Returns the line join style.
OH_Drawing_PenGetMiterLimit()
float OH_Drawing_PenGetMiterLimit (const OH_Drawing_Pen * )
Description
Obtains the stroke miter limit of a polyline drawn by a pen. When the corner type is bevel, a beveled corner is displayed if the miter limit is exceeded, and a mitered corner is displayed if the miter limit is not exceeded.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Pen | Indicates the pointer to an OH_Drawing_Pen object. |
Returns
Returns the miter limit.
OH_Drawing_PenGetWidth()
float OH_Drawing_PenGetWidth (const OH_Drawing_Pen * )
Description
Obtains the thickness of a pen. This thickness determines the width of the outline of a shape.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Pen | Indicates the pointer to an OH_Drawing_Pen object. |
Returns
Returns the thickness.
OH_Drawing_PenIsAntiAlias()
bool OH_Drawing_PenIsAntiAlias (const OH_Drawing_Pen * )
Description
Checks whether anti-aliasing is enabled for a pen. If anti-aliasing is enabled, edges will be drawn with partial transparency.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Pen | Indicates the pointer to an OH_Drawing_Pen object. |
Returns
Returns true if anti-aliasing is enabled; returns false otherwise.
OH_Drawing_PenSetAntiAlias()
void OH_Drawing_PenSetAntiAlias (OH_Drawing_Pen * , bool )
Description
Enables or disables anti-aliasing for a pen. If anti-aliasing is enabled, edges will be drawn with partial transparency.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Pen | Indicates the pointer to an OH_Drawing_Pen object. |
| bool | Specifies whether to enable anti-aliasing. The value true means to enable anti-aliasing, and false means the opposite. |
OH_Drawing_PenSetCap()
void OH_Drawing_PenSetCap (OH_Drawing_Pen * , OH_Drawing_PenLineCapStyle )
Description
Sets the line cap style for a pen.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Pen | Indicates the pointer to an OH_Drawing_Pen object. |
| OH_Drawing_PenLineCapStyle | Indicates a variable that describes the line cap style. |
OH_Drawing_PenSetColor()
void OH_Drawing_PenSetColor (OH_Drawing_Pen * , uint32_t color )
Description
Sets the color for a pen. The color is used by the pen to outline a shape.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Pen | Indicates the pointer to an OH_Drawing_Pen object. |
| color | Indicates the color to set, which is a 32-bit (ARGB) variable. |
OH_Drawing_PenSetJoin()
void OH_Drawing_PenSetJoin (OH_Drawing_Pen * , OH_Drawing_PenLineJoinStyle )
Description
Sets the line join style for a pen.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Pen | Indicates the pointer to an OH_Drawing_Pen object. |
| OH_Drawing_PenLineJoinStyle | Indicates a variable that describes the line join style. |
OH_Drawing_PenSetMiterLimit()
void OH_Drawing_PenSetMiterLimit (OH_Drawing_Pen * , float miter )
Description
Sets the stroke miter limit for a polyline drawn by a pen. When the corner type is bevel, a beveled corner is displayed if the miter limit is exceeded, and a mitered corner is displayed if the miter limit is not exceeded.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Pen | Indicates the pointer to an OH_Drawing_Pen object. |
| miter | Indicates a variable that describes the miter limit. |
OH_Drawing_PenSetWidth()
void OH_Drawing_PenSetWidth (OH_Drawing_Pen * , float width )
Description
Sets the thickness for a pen. This thickness determines the width of the outline of a shape.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Pen | Indicates the pointer to an OH_Drawing_Pen object. |
| width | Indicates the thickness to set, which is a variable. |
OH_Drawing_SetTextStyleBaseLine()
void OH_Drawing_SetTextStyleBaseLine (OH_Drawing_TextStyle * , int )
Description
Sets the text baseline.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_TextStyle | Indicates the pointer to an OH_Drawing_TextStyle object. |
| int | Indicates the text baseline to set. For details, see the enum OH_Drawing_TextBaseline. |
OH_Drawing_SetTextStyleColor()
void OH_Drawing_SetTextStyleColor (OH_Drawing_TextStyle * , uint32_t )
Description
Sets the text color.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_TextStyle | Indicates the pointer to an OH_Drawing_TextStyle object. |
| uint32_t | Indicates the color to set. |
OH_Drawing_SetTextStyleDecoration()
void OH_Drawing_SetTextStyleDecoration (OH_Drawing_TextStyle * , int )
Description
Sets the text decoration.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_TextStyle | Indicates the pointer to an OH_Drawing_TextStyle object. |
| int | Indicates the text decoration to set. For details, see the enum OH_Drawing_TextDecoration. |
OH_Drawing_SetTextStyleDecorationColor()
void OH_Drawing_SetTextStyleDecorationColor (OH_Drawing_TextStyle * , uint32_t )
Description
Sets the color for the text decoration.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_TextStyle | Indicates the pointer to an OH_Drawing_TextStyle object. |
| uint32_t | Indicates the color to set. |
OH_Drawing_SetTextStyleFontFamilies()
void OH_Drawing_SetTextStyleFontFamilies (OH_Drawing_TextStyle * , int , const char * fontFamilies[] )
Description
Sets the font families.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_TextStyle | Indicates the pointer to an OH_Drawing_TextStyle object. |
| int | Indicates the number of font families to set. |
| char | Indicates the pointer to the font families to set. |
OH_Drawing_SetTextStyleFontHeight()
void OH_Drawing_SetTextStyleFontHeight (OH_Drawing_TextStyle * , double )
Description
Sets the font height.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_TextStyle | Indicates the pointer to an OH_Drawing_TextStyle object. |
| double | Indicates the font height to set. |
OH_Drawing_SetTextStyleFontSize()
void OH_Drawing_SetTextStyleFontSize (OH_Drawing_TextStyle * , double )
Description
Sets the font size.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_TextStyle | Indicates the pointer to an OH_Drawing_TextStyle object. |
| double | Indicates the font size to set. |
OH_Drawing_SetTextStyleFontStyle()
void OH_Drawing_SetTextStyleFontStyle (OH_Drawing_TextStyle * , int )
Description
Sets the font style.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_TextStyle | Indicates the pointer to an OH_Drawing_TextStyle object. |
| int | Indicates the font style to set. For details, see the enum OH_Drawing_FontStyle. |
OH_Drawing_SetTextStyleFontWeight()
void OH_Drawing_SetTextStyleFontWeight (OH_Drawing_TextStyle * , int )
Description
Sets the font weight.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_TextStyle | Indicates the pointer to an OH_Drawing_TextStyle object. |
| int | Indicates the font weight to set. For details, see the enum OH_Drawing_FontWeight. |
OH_Drawing_SetTextStyleLocale()
void OH_Drawing_SetTextStyleLocale (OH_Drawing_TextStyle * , const char * )
Description
Sets the locale.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_TextStyle | Indicates the pointer to an OH_Drawing_TextStyle object. |
| char | Indicates the pointer to the locale to set. |
OH_Drawing_SetTypographyTextAlign()
void OH_Drawing_SetTypographyTextAlign (OH_Drawing_TypographyStyle * , int )
Description
Sets the text alignment mode.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_TypographyStyle | Indicates the pointer to an OH_Drawing_TypographyStyle object. |
| int | Indicates the text alignment mode to set. For details, see the enum OH_Drawing_TextAlign. |
OH_Drawing_SetTypographyTextDirection()
void OH_Drawing_SetTypographyTextDirection (OH_Drawing_TypographyStyle * , int )
Description
Sets the text direction.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_TypographyStyle | Indicates the pointer to an OH_Drawing_TypographyStyle object. |
| int | Indicates the text direction to set. For details, see the enum OH_Drawing_TextDirection. |
OH_Drawing_SetTypographyTextMaxLines()
void OH_Drawing_SetTypographyTextMaxLines (OH_Drawing_TypographyStyle * , int )
Description
Sets the maximum number of lines in a text file.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_TypographyStyle | Indicates the pointer to an OH_Drawing_TypographyStyle object. |
| int | Indicates the maximum number of lines to set. |
OH_Drawing_TypographyGetAlphabeticBaseline()
double OH_Drawing_TypographyGetAlphabeticBaseline (OH_Drawing_Typography * )
Description
Obtains the alphabetic baseline.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Typography | Indicates the pointer to an OH_Drawing_Typography object. |
Returns
Returns the alphabetic baseline.
OH_Drawing_TypographyGetHeight()
double OH_Drawing_TypographyGetHeight (OH_Drawing_Typography * )
Description
Obtains the height.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Typography | Indicates the pointer to an OH_Drawing_Typography object. |
Returns
Returns the height.
OH_Drawing_TypographyGetIdeographicBaseline()
double OH_Drawing_TypographyGetIdeographicBaseline (OH_Drawing_Typography * )
Description
Obtains the ideographic baseline.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Typography | Indicates the pointer to an OH_Drawing_Typography object. |
Returns
Returns the ideographic baseline.
OH_Drawing_TypographyGetLongestLine()
double OH_Drawing_TypographyGetLongestLine (OH_Drawing_Typography * )
Description
Obtains the longest line.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Typography | Indicates the pointer to an OH_Drawing_Typography object. |
Returns
Returns the longest line.
OH_Drawing_TypographyGetMaxIntrinsicWidth()
double OH_Drawing_TypographyGetMaxIntrinsicWidth (OH_Drawing_Typography * )
Description
Obtains the maximum intrinsic width.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Typography | Indicates the pointer to an OH_Drawing_Typography object. |
Returns
Returns the maximum intrinsic width.
OH_Drawing_TypographyGetMaxWidth()
double OH_Drawing_TypographyGetMaxWidth (OH_Drawing_Typography * )
Description
Obtains the maximum width.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Typography | Indicates the pointer to an OH_Drawing_Typography object. |
Returns
Returns the maximum width.
OH_Drawing_TypographyGetMinIntrinsicWidth()
double OH_Drawing_TypographyGetMinIntrinsicWidth (OH_Drawing_Typography * )
Description
Obtains the minimum intrinsic width.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Typography | Indicates the pointer to an OH_Drawing_Typography object. |
Returns
Returns the minimum intrinsic width.
OH_Drawing_TypographyHandlerAddText()
void OH_Drawing_TypographyHandlerAddText (OH_Drawing_TypographyCreate * , const char * )
Description
Sets the text content.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_TypographyCreate | Indicates the pointer to an OH_Drawing_TypographyCreate object. |
| char | Indicates the pointer to the text content to set. |
OH_Drawing_TypographyHandlerPopTextStyle()
void OH_Drawing_TypographyHandlerPopTextStyle (OH_Drawing_TypographyCreate * )
Description
Removes the topmost style in the stack, leaving the remaining styles in effect.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_TypographyCreate | Indicates the pointer to an OH_Drawing_TypographyCreate object. |
OH_Drawing_TypographyHandlerPushTextStyle()
void OH_Drawing_TypographyHandlerPushTextStyle (OH_Drawing_TypographyCreate * , OH_Drawing_TextStyle * )
Description
Sets the text style.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_TypographyCreate | Indicates the pointer to an OH_Drawing_TypographyCreate object. |
| OH_Drawing_TextStyle | Indicates the pointer to an OH_Drawing_TextStyle object. |
OH_Drawing_TypographyLayout()
void OH_Drawing_TypographyLayout (OH_Drawing_Typography * , double )
Description
Lays out the typography.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Typography | Indicates the pointer to an OH_Drawing_Typography object. |
| double | Indicates the maximum text width to set. |
OH_Drawing_TypographyPaint()
void OH_Drawing_TypographyPaint (OH_Drawing_Typography * , OH_Drawing_Canvas * , double , double )
Description
Paints text on the canvas.
@syscap SystemCapability.Graphic.Graphic2D.NativeDrawing
Parameters
| Name | Description |
|---|---|
| OH_Drawing_Typography | Indicates the pointer to an OH_Drawing_Typography object. |
| OH_Drawing_Canvas | Indicates the pointer to an OH_Drawing_Canvas object. |
| double | Indicates the x coordinate. |
| double | Indicates the y coordinate. |