CWRVectorRenderer

touchgfx/widgets/canvas/CWRVectorRenderer.hpp

Implementation of the VectorRendererInterface based on the CanvasWidgetRenderer. The class needs to be subclasses to provide the painter objecs.

See: CWRVectorRendererRGB888, CWRVectorRendererRGB565

Inherits from: VectorRenderer

Inherited by: CWRVectorRendererRGB565, CWRVectorRendererRGB888

Public Functions

virtual void	drawPath(const uint8_t cmds, uint32_t nCmds, const float points, uint32_t nPoints, const float * bbox =0)
	Draw a Path defined by the given array of primitives (commands) and an array of the corresponding floating point coordinates.
virtual void	setAlpha(uint8_t a)
	Set the alpha value (opacity) used for future drawings.
virtual void	setColor(colortype c)
	Set a constant color used for future drawings.
virtual void	setLinearGradient(float x0, float y0, float x1, float y1, uint32_t stops, const float stopPositions, const uint32_t stopColors, float width, float height, bool solid, const uint32_t * palette)
	Set a linear gradient used for future drawings.
virtual void	setMode(DrawMode mode)
	Set the drawing mode for the VectorRenderer.
virtual void	setRadialGradient(float cx, float cy, float radius, uint32_t stops, const float stopPositions, const colortype stopColors)
	Set a radial gradient used for future drawings.
virtual void	setStrokeLineCap(VGStrokeLineCap lineCap)
	Sets stroke line cap type.
virtual void	setStrokeLineJoin(VGStrokeLineJoin lineJoin)
	Sets stroke line join type.
virtual void	setStrokeMiterLimit(float miterLimit)
	Sets stroke miter limit.
virtual void	setStrokeWidth(float w)
	Set the width used for future drawings using the VECTOR_STROKE drawing mode.
virtual void	setTransformationMatrix(const Matrix3x3 & m)
	Sets the transformation matrix used for future drawings.
virtual void	setup(const Widget & renderer, const Rect & drawingArea)
	Start a new drawing in the given area.
virtual void	tearDown()
	Finalizes the current drawing.

Additional inherited members

Public Types inherited from VectorRenderer

enum	DrawMode { STROKE, FILL_EVEN_ODD, FILL_NON_ZERO }
	A list of vector graphics drawing modes.

Public Functions inherited from VectorRenderer

virtual	~VectorRenderer()
	Virtual destructor.
VectorRenderer *	getInstance()
	Gets the VectorRenderer instance.

Public Functions Documentation

drawPath

virtual void drawPath	(	const uint8_t *	cmds ,
		uint32_t	nCmds ,
		const float *	points ,
		uint32_t	nPoints ,
		const float *	bbox =0
		)

Draw a Path defined by the given array of primitives (commands) and an array of the corresponding floating point coordinates.

Parameters:

cmds	An uint8_t array of VectorPrimitives values
nCmds	The number of commands in cmds
points	An array of coordinates for the commands
nPoints	The number of values in the points arrays
bbox	Array describing the bounding box of the path [minx,miny,maxx,maxy] or 0 if unknown

Reimplements: touchgfx::VectorRenderer::drawPath

setAlpha

virtual void setAlpha	(	uint8_t	a	)

Set the alpha value (opacity) used for future drawings.

The alpha is specified in the interval [0;1].

Parameters:

a	The alpha value.

Reimplements: touchgfx::VectorRenderer::setAlpha

setColor

virtual void setColor	(	colortype	c	)

Set a constant color used for future drawings.

Parameters:

c	An ARGB color value

Reimplements: touchgfx::VectorRenderer::setColor

setLinearGradient

virtual void setLinearGradient	(	float	x0 ,
		float	y0 ,
		float	x1 ,
		float	y1 ,
		uint32_t	stops ,
		const float *	stopPositions ,
		const uint32_t *	stopColors ,
		float	width ,
		float	height ,
		bool	solid ,
		const uint32_t *	palette
		)

Set a linear gradient used for future drawings.

The linear gradient is transformed using the current transformation matrix. Multiple colors (stops) can be specified for the gradient. The stop positions are given in the range [0;1].

Parameters:

x0	X-coordinate for gradient starting point
y0	Y-coordinate for gradient starting point
x1	X-coordinate for gradient end point
y1	Y-coordinate for gradient end point
stops	Number of stops
stopPositions	Positions of the stops on the line
stopColors	Colors of the stops
width	Width of the box to fill
height	Height of the box to fill
solid	True if all colors in the gradient are solid
palette	The gradient palette

Reimplements: touchgfx::VectorRenderer::setLinearGradient

setMode

virtual void setMode	(	DrawMode	mode	)

Set the drawing mode for the VectorRenderer.

The mode will be used for all subsequent drawings until setMode is called again.

The default mode is non-zero filling.

Parameters:

mode	The filling mode.

Reimplements: touchgfx::VectorRenderer::setMode

setRadialGradient

virtual void setRadialGradient	(	float	cx ,
		float	cy ,
		float	radius ,
		uint32_t	stops ,
		const float *	stopPositions ,
		const colortype *	stopColors
		)

Set a radial gradient used for future drawings.

The radial gradient is transformed using the current transformation matrix. Multiple colors (stops) can be specified for the gradient. The stop positions are given in the range [0;1].

Parameters:

cx	X-coordinate for the gradient center
cy	Y-coordinate for the gradient center
radius	Radius of the gradient
stops	Number of stops
stopPositions	Positions of the stops on the line
stopColors	Colors of the stops

setStrokeLineCap

virtual void setStrokeLineCap	(	VGStrokeLineCap	lineCap	)

Sets stroke line cap type.

Parameters:

lineCap	The line cap type.

Reimplements: touchgfx::VectorRenderer::setStrokeLineCap

setStrokeLineJoin

virtual void setStrokeLineJoin	(	VGStrokeLineJoin	lineJoin	)

Sets stroke line join type.

Parameters:

lineJoin	The line join type.

Reimplements: touchgfx::VectorRenderer::setStrokeLineJoin

setStrokeMiterLimit

virtual void setStrokeMiterLimit	(	float	miterLimit	)

Sets stroke miter limit.

This the max distance from the Miter point on the stroke to the stroke point that will be used. If the miter limit is exceeded for a stroke join, it will not be drawn as a Miter but as a Bevel.

Parameters:

miterLimit	The miter limit.

Reimplements: touchgfx::VectorRenderer::setStrokeMiterLimit

setStrokeWidth

virtual void setStrokeWidth	(	float	w	)

Set the width used for future drawings using the VECTOR_STROKE drawing mode.

Parameters:

w	The width used for stroke drawing.

Reimplements: touchgfx::VectorRenderer::setStrokeWidth

setTransformationMatrix

virtual void setTransformationMatrix	(	const Matrix3x3 &	m	)

Sets the transformation matrix used for future drawings.

The transformation is reset when setup is called.

Parameters:

m	The transformation matrix

Reimplements: touchgfx::VectorRenderer::setTransformationMatrix

setup

virtual void setup	(	const Widget &	renderer ,
		const Rect &	drawingArea
		)

Start a new drawing in the given area.

The area typically corresponds to an invalidated area of a Widget. Implementations may lock the framebuffer here. The drawing area is given in the widget coordinate system.

Parameters:

renderer	The Widget that does the rendering.
drawingArea	The area of the screen to draw in.

Reimplements: touchgfx::VectorRenderer::setup

tearDown

virtual void tearDown	(			)

Finalizes the current drawing.

The implementation may block here until the drawing is done.

The implementation is required to unlock the framebuffer when tearDown is called.

Reimplements: touchgfx::VectorRenderer::tearDown