VectorRenderer

touchgfx/hal/VectorRenderer.hpp

Abstract interface for classes implementing general 2D vector drawing. Users of this interface are Widgets drawing vector graphics like SVG images.

Implementations draw the path given (in drawPath) using the last color or gradient supplied with setColor, setLinearGradient, or setRadialGradient.

Inherited by: CWRVectorRenderer

Public Types

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

Public Functions

virtual void	drawPath(const uint8_t cmds, uint32_t nCmds, const float points, uint32_t nPoints, const float * bbox =0) =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) =0
	Set the alpha value (opacity) used for future drawings.
virtual void	setColor(colortype c) =0
	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) =0
	Set a linear gradient used for future drawings.
virtual void	setMode(DrawMode mode) =0
	Set the drawing mode for the VectorRenderer.
virtual void	setStrokeLineCap(VGStrokeLineCap lineCap) =0
	Sets stroke line cap type.
virtual void	setStrokeLineJoin(VGStrokeLineJoin lineJoin) =0
	Sets stroke line join type.
virtual void	setStrokeMiterLimit(float miterLimit) =0
	Sets stroke miter limit.
virtual void	setStrokeWidth(float w) =0
	Set the width used for future drawings using the VECTOR_STROKE drawing mode.
virtual void	setTransformationMatrix(const Matrix3x3 & m) =0
	Sets the transformation matrix used for future drawings.
virtual void	setup(const Widget & renderer, const Rect & drawingArea) =0
	Start a new drawing in the given area.
virtual void	tearDown() =0
	Finalizes the current drawing.
virtual	~VectorRenderer()
	Virtual destructor.
VectorRenderer *	getInstance()
	Gets the VectorRenderer instance.

Public Types Documentation

DrawMode

enum DrawMode

A list of vector graphics drawing modes.

STROKE	Draw the outline of the paths.
FILL_EVEN_ODD	Fill the paths using the even-odd filling rule.
FILL_NON_ZERO	Fill the paths using the non-zero filling rule.

Public Functions Documentation

drawPath

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

Reimplemented by: touchgfx::CWRVectorRenderer::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.

Reimplemented by: touchgfx::CWRVectorRenderer::setAlpha

setColor

virtual void setColor	(	colortype	c	)

Set a constant color used for future drawings.

Parameters:

c	An ARGB color value

Reimplemented by: touchgfx::CWRVectorRenderer::setColor

setLinearGradient

virtual void setLinearGradient	(	float	x0 ,		=0
		float	y0 ,		=0
		float	x1 ,		=0
		float	y1 ,		=0
		uint32_t	stops ,		=0
		const float *	stopPositions ,		=0
		const uint32_t *	stopColors ,		=0
		float	width ,		=0
		float	height ,		=0
		bool	solid ,		=0
		const uint32_t *	palette		=0
		)	=0

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

Reimplemented by: touchgfx::CWRVectorRenderer::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.

Reimplemented by: touchgfx::CWRVectorRenderer::setMode

setStrokeLineCap

virtual void setStrokeLineCap	(	VGStrokeLineCap	lineCap	)

Sets stroke line cap type.

Parameters:

lineCap	The line cap type.

Reimplemented by: touchgfx::CWRVectorRenderer::setStrokeLineCap

setStrokeLineJoin

virtual void setStrokeLineJoin	(	VGStrokeLineJoin	lineJoin	)

Sets stroke line join type.

Parameters:

lineJoin	The line join type.

Reimplemented by: touchgfx::CWRVectorRenderer::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.

Reimplemented by: touchgfx::CWRVectorRenderer::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.

Reimplemented by: touchgfx::CWRVectorRenderer::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

Reimplemented by: touchgfx::CWRVectorRenderer::setTransformationMatrix

setup

virtual void setup	(	const Widget &	renderer ,		=0
		const Rect &	drawingArea		=0
		)	=0

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.

Parameters:

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

Reimplemented by: touchgfx::CWRVectorRenderer::setup

tearDown

virtual void tearDown	(			)	=0

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.

Reimplemented by: touchgfx::CWRVectorRenderer::tearDown

~VectorRenderer

virtual ~VectorRenderer	(			)

Virtual destructor.

getInstance

static VectorRenderer * getInstance	(			)

Gets the VectorRenderer instance.

Returns:

The VectorRenderer instance.