RecordingCanvas

disableZ

public void disableZ ()

Disables Z support, preventing any RenderNodes drawn after this point from being visually reordered or having shadows rendered. Note: This is not impacted by any save() or restore() calls as it is not considered to be part of the current matrix or clip. See enableZ()

drawARGB

public void drawARGB (int a, 
                int r, 
                int g, 
                int b)

Fill the entire canvas' bitmap (restricted to the current clip) with the specified ARGB color, using srcover porterduff mode.

drawArc

public void drawArc (float left, 
                float top, 
                float right, 
                float bottom, 
                float startAngle, 
                float sweepAngle, 
                boolean useCenter, 
                Paint paint)

Draw the specified arc, which will be scaled to fit inside the specified oval.

If the start angle is negative or >= 360, the start angle is treated as start angle modulo 360.

If the sweep angle is >= 360, then the oval is drawn completely. Note that this differs slightly from SkPath::arcTo, which treats the sweep angle modulo 360. If the sweep angle is negative, the sweep angle is treated as sweep angle modulo 360

The arc is drawn clockwise. An angle of 0 degrees correspond to the geometric angle of 0 degrees (3 o'clock on a watch.)

drawArc

public void drawArc (RectF oval, 
                float startAngle, 
                float sweepAngle, 
                boolean useCenter, 
                Paint paint)

Draw the specified arc, which will be scaled to fit inside the specified oval.

If the start angle is negative or >= 360, the start angle is treated as start angle modulo 360.

If the sweep angle is >= 360, then the oval is drawn completely. Note that this differs slightly from SkPath::arcTo, which treats the sweep angle modulo 360. If the sweep angle is negative, the sweep angle is treated as sweep angle modulo 360

The arc is drawn clockwise. An angle of 0 degrees correspond to the geometric angle of 0 degrees (3 o'clock on a watch.)

drawBitmap

public void drawBitmap (Bitmap bitmap, 
                Matrix matrix, 
                Paint paint)

Draw the bitmap using the specified matrix.

drawBitmap

public void drawBitmap (int[] colors, 
                int offset, 
                int stride, 
                float x, 
                float y, 
                int width, 
                int height, 
                boolean hasAlpha, 
                Paint paint)

This method is deprecated.
checkstyle

Treat the specified array of colors as a bitmap, and draw it. This gives the same result as first creating a bitmap from the array, and then drawing it, but this method avoids explicitly creating a bitmap object which can be more efficient if the colors are changing often.

drawBitmap

public void drawBitmap (int[] colors, 
                int offset, 
                int stride, 
                int x, 
                int y, 
                int width, 
                int height, 
                boolean hasAlpha, 
                Paint paint)

This method is deprecated.
checkstyle

Legacy version of drawBitmap(int[] colors, ...) that took ints for x,y

drawBitmap

public void drawBitmap (Bitmap bitmap, 
                Rect src, 
                Rect dst, 
                Paint paint)

Draw the specified bitmap, scaling/translating automatically to fill the destination rectangle. If the source rectangle is not null, it specifies the subset of the bitmap to draw.

Note: if the paint contains a maskfilter that generates a mask which extends beyond the bitmap's original width/height (e.g. BlurMaskFilter), then the bitmap will be drawn as if it were in a Shader with CLAMP mode. Thus the color outside of the original width/height will be the edge color replicated.

This function ignores the density associated with the bitmap. This is because the source and destination rectangle coordinate spaces are in their respective densities, so must already have the appropriate scaling factor applied.

drawBitmap

public void drawBitmap (Bitmap bitmap, 
                float left, 
                float top, 
                Paint paint)

Draw the specified bitmap, with its top/left corner at (x,y), using the specified paint, transformed by the current matrix.

Note: if the paint contains a maskfilter that generates a mask which extends beyond the bitmap's original width/height (e.g. BlurMaskFilter), then the bitmap will be drawn as if it were in a Shader with CLAMP mode. Thus the color outside of the original width/height will be the edge color replicated.

If the bitmap and canvas have different densities, this function will take care of automatically scaling the bitmap to draw at the same density as the canvas.

drawBitmap

public void drawBitmap (Bitmap bitmap, 
                Rect src, 
                RectF dst, 
                Paint paint)

Draw the specified bitmap, scaling/translating automatically to fill the destination rectangle. If the source rectangle is not null, it specifies the subset of the bitmap to draw.

Note: if the paint contains a maskfilter that generates a mask which extends beyond the bitmap's original width/height (e.g. BlurMaskFilter), then the bitmap will be drawn as if it were in a Shader with CLAMP mode. Thus the color outside of the original width/height will be the edge color replicated.

This function ignores the density associated with the bitmap. This is because the source and destination rectangle coordinate spaces are in their respective densities, so must already have the appropriate scaling factor applied.

drawBitmapMesh

public void drawBitmapMesh (Bitmap bitmap, 
                int meshWidth, 
                int meshHeight, 
                float[] verts, 
                int vertOffset, 
                int[] colors, 
                int colorOffset, 
                Paint paint)

Draw the bitmap through the mesh, where mesh vertices are evenly distributed across the bitmap. There are meshWidth+1 vertices across, and meshHeight+1 vertices down. The verts array is accessed in row-major order, so that the first meshWidth+1 vertices are distributed across the top of the bitmap from left to right. A more general version of this method is drawVertices(). Prior to API level android.os.Build.VERSION_CODES.P Build.VERSION_CODES.P vertOffset and colorOffset were ignored, effectively treating them as zeros. In API level android.os.Build.VERSION_CODES.P Build.VERSION_CODES.P and above these parameters will be respected.

Note: antialiasing is not supported, therefore Paint.ANTI_ALIAS_FLAG is ignored.

drawCircle

public void drawCircle (float cx, 
                float cy, 
                float radius, 
                Paint paint)

Draw the specified circle using the specified paint. If radius is <= 0, then nothing will be drawn. The circle will be filled or framed based on the Style in the paint.

drawColor

public void drawColor (long color, 
                BlendMode mode)

Fill the entire canvas' bitmap (restricted to the current clip) with the specified color and blendmode.

drawColor

public void drawColor (int color)

Fill the entire canvas' bitmap (restricted to the current clip) with the specified color, using srcover porterduff mode.

drawColor

public void drawColor (int color, 
                BlendMode mode)

Fill the entire canvas' bitmap (restricted to the current clip) with the specified color and blendmode.

drawColor

public void drawColor (int color, 
                PorterDuff.Mode mode)

Fill the entire canvas' bitmap (restricted to the current clip) with the specified color and porter-duff xfermode.

drawDoubleRoundRect

public void drawDoubleRoundRect (RectF outer, 
                float[] outerRadii, 
                RectF inner, 
                float[] innerRadii, 
                Paint paint)

Draws a double rounded rectangle using the specified paint. The resultant round rect will be filled in the area defined between the outer and inner rectangular bounds if the Paint configured with Paint.Style.FILL. Otherwise if Paint.Style.STROKE is used, then 2 rounded rect strokes will be drawn at the outer and inner rounded rectangles

drawDoubleRoundRect

public void drawDoubleRoundRect (RectF outer, 
                float outerRx, 
                float outerRy, 
                RectF inner, 
                float innerRx, 
                float innerRy, 
                Paint paint)

Draws a double rounded rectangle using the specified paint. The resultant round rect will be filled in the area defined between the outer and inner rectangular bounds if the Paint configured with Paint.Style.FILL. Otherwise if Paint.Style.STROKE is used, then 2 rounded rect strokes will be drawn at the outer and inner rounded rectangles

drawGlyphs

public void drawGlyphs (int[] glyphIds, 
                int glyphIdOffset, 
                float[] positions, 
                int positionOffset, 
                int glyphCount, 
                Font font, 
                Paint paint)

Draw array of glyphs with specified font.

drawLine

public void drawLine (float startX, 
                float startY, 
                float stopX, 
                float stopY, 
                Paint paint)

Draw a line segment with the specified start and stop x,y coordinates, using the specified paint.

Note that since a line is always "framed", the Style is ignored in the paint.

Degenerate lines (length is 0) will not be drawn.

drawLines

public void drawLines (float[] pts, 
                int offset, 
                int count, 
                Paint paint)

Draw a series of lines. Each line is taken from 4 consecutive values in the pts array. Thus to draw 1 line, the array must contain at least 4 values. This is logically the same as drawing the array as follows: drawLine(pts[0], pts[1], pts[2], pts[3]) followed by drawLine(pts[4], pts[5], pts[6], pts[7]) and so on.

drawLines

public void drawLines (float[] pts, 
                Paint paint)

drawMesh

public void drawMesh (Mesh mesh, 
                BlendMode blendMode, 
                Paint paint)

Draws a mesh object to the screen.

Note: antialiasing is not supported, therefore Paint.ANTI_ALIAS_FLAG is ignored.

drawOval

public void drawOval (float left, 
                float top, 
                float right, 
                float bottom, 
                Paint paint)

Draw the specified oval using the specified paint. The oval will be filled or framed based on the Style in the paint.

drawOval

public void drawOval (RectF oval, 
                Paint paint)

Draw the specified oval using the specified paint. The oval will be filled or framed based on the Style in the paint.

drawPaint

public void drawPaint (Paint paint)

Fill the entire canvas' bitmap (restricted to the current clip) with the specified paint. This is equivalent (but faster) to drawing an infinitely large rectangle with the specified paint.

drawPatch

public void drawPatch (NinePatch patch, 
                RectF dst, 
                Paint paint)

Draws the specified bitmap as an N-patch (most often, a 9-patch.)

Note: antialiasing is not supported, therefore Paint.ANTI_ALIAS_FLAG is ignored.

drawPatch

public void drawPatch (NinePatch patch, 
                Rect dst, 
                Paint paint)

Draws the specified bitmap as an N-patch (most often, a 9-patch.)

Note: antialiasing is not supported, therefore Paint.ANTI_ALIAS_FLAG is ignored.

drawPath

public void drawPath (Path path, 
                Paint paint)

Draw the specified path using the specified paint. The path will be filled or framed based on the Style in the paint.

drawPicture

public void drawPicture (Picture picture, 
                Rect dst)

Draw the picture, stretched to fit into the dst rectangle.

drawPicture

public void drawPicture (Picture picture, 
                RectF dst)

Draw the picture, stretched to fit into the dst rectangle.

drawPicture

public void drawPicture (Picture picture)

Save the canvas state, draw the picture, and restore the canvas state. This differs from picture.draw(canvas), which does not perform any save/restore.

Note: This forces the picture to internally call Picture.endRecording in order to prepare for playback.

drawPoint

public void drawPoint (float x, 
                float y, 
                Paint paint)

Helper for drawPoints() for drawing a single point.

drawPoints

public void drawPoints (float[] pts, 
                int offset, 
                int count, 
                Paint paint)

Draw a series of points. Each point is centered at the coordinate specified by pts[], and its diameter is specified by the paint's stroke width (as transformed by the canvas' CTM), with special treatment for a stroke width of 0, which always draws exactly 1 pixel (or at most 4 if antialiasing is enabled). The shape of the point is controlled by the paint's Cap type. The shape is a square, unless the cap type is Round, in which case the shape is a circle.

drawPoints

public void drawPoints (float[] pts, 
                Paint paint)

Helper for drawPoints() that assumes you want to draw the entire array

drawPosText

public void drawPosText (String text, 
                float[] pos, 
                Paint paint)

This method is deprecated.
checkstyle

Draw the text in the array, with each character's origin specified by the pos array.

drawPosText

public void drawPosText (char[] text, 
                int index, 
                int count, 
                float[] pos, 
                Paint paint)

This method is deprecated.
checkstyle

Draw the text in the array, with each character's origin specified by the pos array.

drawRGB

public void drawRGB (int r, 
                int g, 
                int b)

Fill the entire canvas' bitmap (restricted to the current clip) with the specified RGB color, using srcover porterduff mode.

drawRect

public void drawRect (float left, 
                float top, 
                float right, 
                float bottom, 
                Paint paint)

Draw the specified Rect using the specified paint. The rectangle will be filled or framed based on the Style in the paint.

drawRect

public void drawRect (Rect r, 
                Paint paint)

Draw the specified Rect using the specified Paint. The rectangle will be filled or framed based on the Style in the paint.

drawRect

public void drawRect (RectF rect, 
                Paint paint)

Draw the specified Rect using the specified paint. The rectangle will be filled or framed based on the Style in the paint.

drawRegion

public void drawRegion (Region region, 
                Paint paint)

Draws the given region using the given paint.

drawRenderNode

public void drawRenderNode (RenderNode renderNode)

Draws the specified display list onto this canvas.

drawRoundRect

public void drawRoundRect (RectF rect, 
                float rx, 
                float ry, 
                Paint paint)

Draw the specified round-rect using the specified paint. The roundrect will be filled or framed based on the Style in the paint.

drawRoundRect

public void drawRoundRect (float left, 
                float top, 
                float right, 
                float bottom, 
                float rx, 
                float ry, 
                Paint paint)

Draw the specified round-rect using the specified paint. The roundrect will be filled or framed based on the Style in the paint.

drawText

public void drawText (CharSequence text, 
                int start, 
                int end, 
                float x, 
                float y, 
                Paint paint)

Draw the specified range of text, specified by start/end, with its origin at (x,y), in the specified Paint. The origin is interpreted based on the Align setting in the Paint.

drawText

public void drawText (String text, 
                float x, 
                float y, 
                Paint paint)

Draw the text, with origin at (x,y), using the specified paint. The origin is interpreted based on the Align setting in the paint.

drawText

public void drawText (String text, 
                int start, 
                int end, 
                float x, 
                float y, 
                Paint paint)

Draw the text, with origin at (x,y), using the specified paint. The origin is interpreted based on the Align setting in the paint.

drawText

public void drawText (char[] text, 
                int index, 
                int count, 
                float x, 
                float y, 
                Paint paint)

Draw the text, with origin at (x,y), using the specified paint. The origin is interpreted based on the Align setting in the paint.

drawTextOnPath

public void drawTextOnPath (String text, 
                Path path, 
                float hOffset, 
                float vOffset, 
                Paint paint)

Draw the text, with origin at (x,y), using the specified paint, along the specified path. The paint's Align setting determines where along the path to start the text.

drawTextOnPath

public void drawTextOnPath (char[] text, 
                int index, 
                int count, 
                Path path, 
                float hOffset, 
                float vOffset, 
                Paint paint)

Draw the text, with origin at (x,y), using the specified paint, along the specified path. The paint's Align setting determines where along the path to start the text.

drawTextRun

public void drawTextRun (MeasuredText measuredText, 
                int start, 
                int end, 
                int contextStart, 
                int contextEnd, 
                float x, 
                float y, 
                boolean isRtl, 
                Paint paint)

Draw a run of text, all in a single direction, with optional context for complex text shaping.

See drawTextRun(java.lang.CharSequence, int, int, int, int, float, float, boolean, android.graphics.Paint) for more details. This method uses a MeasuredText rather than CharSequence to represent the string.

drawTextRun

public void drawTextRun (char[] text, 
                int index, 
                int count, 
                int contextIndex, 
                int contextCount, 
                float x, 
                float y, 
                boolean isRtl, 
                Paint paint)

Draw a run of text, all in a single direction, with optional context for complex text shaping.

See drawTextRun(java.lang.CharSequence, int, int, int, int, float, float, boolean, android.graphics.Paint) for more details. This method uses a character array rather than CharSequence to represent the string. Also, to be consistent with the pattern established in drawText(char, int, int, float, float, Paint), in this method count and contextCount are used rather than offsets of the end position; count = end - start, contextCount = contextEnd - contextStart.

drawTextRun

public void drawTextRun (CharSequence text, 
                int start, 
                int end, 
                int contextStart, 
                int contextEnd, 
                float x, 
                float y, 
                boolean isRtl, 
                Paint paint)

Draw a run of text, all in a single direction, with optional context for complex text shaping.

The run of text includes the characters from start to end in the text. In addition, the range contextStart to contextEnd is used as context for the purpose of complex text shaping, such as Arabic text potentially shaped differently based on the text next to it.

All text outside the range contextStart..contextEnd is ignored. The text between start and end will be laid out and drawn. The context range is useful for contextual shaping, e.g. Kerning, Arabic contextural form.

The direction of the run is explicitly specified by isRtl. Thus, this method is suitable only for runs of a single direction. Alignment of the text is as determined by the Paint's TextAlign value. Further, 0 <= contextStart <= start <= end <= contextEnd <= text.length must hold on entry.

Also see Paint.getRunAdvance(char, int, int, int, int, boolean, int) for a corresponding method to measure the text; the advance width of the text drawn matches the value obtained from that method.

drawVertices

public void drawVertices (Canvas.VertexMode mode, 
                int vertexCount, 
                float[] verts, 
                int vertOffset, 
                float[] texs, 
                int texOffset, 
                int[] colors, 
                int colorOffset, 
                short[] indices, 
                int indexOffset, 
                int indexCount, 
                Paint paint)

Draw the array of vertices, interpreted as triangles (based on mode). The verts array is required, and specifies the x,y pairs for each vertex. If texs is non-null, then it is used to specify the coordinate in shader coordinates to use at each vertex (the paint must have a shader in this case). If there is no texs array, but there is a color array, then each color is interpolated across its corresponding triangle in a gradient. If both texs and colors arrays are present, then they behave as before, but the resulting color at each pixels is the result of multiplying the colors from the shader and the color-gradient together. The indices array is optional, but if it is present, then it is used to specify the index of each triangle, rather than just walking through the arrays in order.

Note: antialiasing is not supported, therefore Paint.ANTI_ALIAS_FLAG is ignored.

enableZ

public void enableZ ()

Enables Z support which defaults to disabled. This allows for RenderNodes drawn with drawRenderNode(android.graphics.RenderNode) to be re-arranged based off of their RenderNode.getElevation() and RenderNode.getTranslationZ() values. It also enables rendering of shadows for RenderNodes with an elevation or translationZ.

Any draw reordering will not be moved before this call. A typical usage of this might look something like:

     void draw(Canvas canvas) {
         // Draw any background content
         canvas.drawColor(backgroundColor);

         // Begin drawing that may be reordered based off of Z
         canvas.enableZ();
         for (RenderNode child : children) {
             canvas.drawRenderNode(child);
         }
         // End drawing that may be reordered based off of Z
         canvas.disableZ();

         // Draw any overlays
         canvas.drawText("I'm on top of everything!", 0, 0, paint);
     }
 

getHeight

public int getHeight ()

Returns the height of the current drawing layer

getMaximumBitmapHeight

public int getMaximumBitmapHeight ()

Returns the maximum allowed height for bitmaps drawn with this canvas. Attempting to draw with a bitmap taller than this value will result in an error.

getMaximumBitmapWidth

public int getMaximumBitmapWidth ()

Returns the maximum allowed width for bitmaps drawn with this canvas. Attempting to draw with a bitmap wider than this value will result in an error.

getWidth

public int getWidth ()

Returns the width of the current drawing layer

isHardwareAccelerated

public boolean isHardwareAccelerated ()

Indicates whether this Canvas uses hardware acceleration. Note that this method does not define what type of hardware acceleration may or may not be used.

isOpaque

public boolean isOpaque ()

Return true if the device that the current layer draws into is opaque (that is, it does not support per-pixel alpha).

setBitmap

public void setBitmap (Bitmap bitmap)

Specify a bitmap for the canvas to draw into. All canvas state such as layers, filters, and the save/restore stack are reset. Additionally, the canvas' target density is updated to match that of the bitmap. Prior to API level android.os.Build.VERSION_CODES.O Build.VERSION_CODES.O the current matrix and clip stack were preserved.

setDensity

public void setDensity (int density)

Specifies the density for this Canvas' backing bitmap. This modifies the target density of the canvas itself, as well as the density of its backing bitmap via Bitmap.setDensity(int).