A canvas is an abstraction of a drawing area. More...

#include <Canvas.h>

Inheritance diagram for te::map::Canvas:

Public Member Functions
Initializer Methods
Methods related to instantiation and destruction.
	Canvas ()
	Constructor. More...

virtual	~Canvas ()
	Virtual destructor. More...

Accessor Methods
Methods used to access internal attributes.
virtual void	setWindow (const double &llx, const double &lly, const double &urx, const double &ury)=0
	It sets the world (or window) coordinates area (supposing a cartesian reference system). More...

virtual void	calcAspectRatio (double &llx, double &lly, double &urx, double &ury, const AlignType hAlign=Center, const AlignType vAlign=Center)=0
	It calculates the best aspect ratio for world (or window) coordinates area (supposing a cartesian reference system). More...

virtual void	calcAspectRatio (te::gm::Envelope *envelope, const AlignType hAlign=Center, const AlignType vAlign=Center)=0
	It calculates the best aspect ratio for world (or window) coordinates area (supposing a cartesian reference system). More...

virtual void	setBackgroundColor (const te::color::RGBAColor &color)=0
	It sets the canvas background color. More...

virtual te::color::RGBAColor	getBackgroundColor () const =0
	It returns the canvas background color. More...

virtual void	clear ()=0
	It clears the canvas content and fills with the background color. More...

virtual void	resize (int w, int h)=0
	It adjusts the canvas size (width and height). More...

virtual int	getWidth () const =0
	It returns the canvas width. More...

virtual int	getHeight () const =0
	It returns the canvas height. More...

Geographical Objects Drawing Methods (TerraLib Geometry)
Methods used to draw geographical objects encoded as a TerraLib Geometry. Note that the visual (style and symbol) used to draw geometries is affected by the visual methods.
virtual void	draw (const te::gm::Geometry *geom)=0
	It draws the geometry on canvas. More...

virtual void	draw (const te::gm::Point *point)=0
	It draws the point on canvas. More...

virtual void	draw (const te::gm::MultiPoint *mpoint)=0
	It draws the MultiPoint on canvas. More...

virtual void	draw (const te::gm::LineString *line)=0
	It draws the LineString on canvas. More...

virtual void	draw (const te::gm::MultiLineString *mline)=0
	It draws the MultiLineString on canvas. More...

virtual void	draw (const te::gm::Polygon *poly)=0
	It draws the polygon on canvas. More...

virtual void	draw (const te::gm::MultiPolygon *mpoly)=0
	It draws the MultiPolygon on canvas. More...

virtual void	draw (const te::gm::GeometryCollection *g)=0
	It draws the GeometryCollection on canvas. More...

virtual void	draw (const te::gm::MultiSurface *g)=0
	It draws the MultiSurface on canvas. More...

Image Handling
Methods used to draw an image on Canvas.
virtual void	save (const char *fileName, ImageType t, int quality=75, int fg=0) const =0
	It saves the canvas content to a file image in the specified format type. More...

virtual char *	getImage (ImageType t, std::size_t &size, int quality=75, int fg=0) const =0
	It returns the internal content as an image in a specific format (PNG, JPEG, ...). More...

virtual te::color::RGBAColor **	getImage (const int x=0, const int y=0, const int w=0, const int h=0) const =0
	It gets a RGBA color array from internal canvas buffer. More...

virtual void	freeImage (char *img) const =0
	This is the method that you should use to release an image generated by the canvas. More...

virtual void	drawImage (char *src, std::size_t size, ImageType t)=0
	It draws the src image over the canvas. More...

virtual void	drawImage (te::color::RGBAColor **src, int w, int h)=0
	It draws the src image over the canvas. More...

virtual void	drawImage (int x, int y, char *src, std::size_t size, ImageType t)=0
	It draws the src image over the canvas at the specified position (x, y). More...

virtual void	drawImage (int x, int y, te::color::RGBAColor **src, int w, int h)=0
	It draws the src image over the canvas at the specified position (x, y). More...

virtual void	drawImage (int x, int y, int w, int h, char *src, std::size_t size, ImageType t)=0
	It draws the source image into the rectangle at position (x, y) with the given width and height. More...

virtual void	drawImage (int x, int y, int w, int h, te::color::RGBAColor **src, int srcw, int srch)=0
	It draws the source image into the rectangle at position (x, y) with the given width and height. More...

virtual void	drawImage (int x, int y, int w, int h, char *src, std::size_t size, ImageType t, int sx, int sy, int sw, int sh)=0
	It draws the rectangular portion with the origin (sx, sy), width sw and height sh, of the source image, at the point (x, y), with a width of w and a height of h. If sw or sh are equal to zero the width/height of the pixmap is used and adjusted by the offset sx/sy. More...

virtual void	drawImage (int x, int y, int w, int h, te::color::RGBAColor **src, int sx, int sy, int sw, int sh)=0
	It draws the rectangular portion with the origin (sx, sy), width sw and height sh, of the source image, at the point (x, y), with a width of w and a height of h. If sw or sh are equal to zero the width/height of the pixmap is used and adjusted by the offset sx/sy. More...

virtual void	drawImage (int x, int y, te::rst::Raster *src, int opacity=TE_OPAQUE)=0
	It draws a raster over the canvas at the specified position (x, y). The raster must be with three 8-bit bands (1R, 2G, 3B),. More...

virtual void	drawImage (int x, int y, int w, int h, te::rst::Raster *src, int sx, int sy, int sw, int sh, int opacity=TE_OPAQUE)=0
	It draws the rectangular portion with the origin (sx, sy), width sw and height sh, of the source raster, starting at the point (x, y), with a width of w and a height of h. If sw or sh are equal to zero the width/height of the pixmap is used and adjusted by the offset sx/sy. More...

Pixel Handling
Methods used to draw a pixel on Canvas.
virtual void	drawPixel (int x, int y)=0
	It sets a pixel using the point pen. More...

virtual void	drawPixel (int x, int y, const te::color::RGBAColor &color)=0
	It sets a pixel to a particular color. More...

Text Handling
Methods used to draw a text on Canvas.
virtual void	drawText (int x, int y, const std::string &txt, float angle=0.0, double anchorX=0.5, double anchorY=0.5, int displacementX=0, int displacementY=0)=0
	It draws a text. More...

virtual void	drawText (const te::gm::Point *p, const std::string &txt, float angle=0.0, double anchorX=0.5, double anchorY=0.5, int displacementX=0, int displacementY=0)=0
	It draws a text. More...

virtual void	drawText (const double &x, const double &y, const std::string &txt, float angle=0.0, double anchorX=0.5, double anchorY=0.5, int displacementX=0, int displacementY=0)=0
	It draws a text. More...

virtual te::gm::Polygon *	getTextBoundary (int x, int y, const std::string &txt, float angle=0.0, double anchorX=0.5, double anchorY=0.5, int displacementX=0, int displacementY=0)=0
	It returns the text boundary (its enclose rectangle). More...

virtual te::gm::Polygon *	getTextBoundary (const te::gm::Point *p, const std::string &txt, float angle=0.0, double anchorX=0.5, double anchorY=0.5, int displacementX=0, int displacementY=0)=0
	It returns the text boundary (its enclose rectangle). More...

virtual te::gm::Polygon *	getTextBoundary (const double &x, const double &y, const std::string &txt, float angle=0.0, double anchorX=0.5, double anchorY=0.5, int displacementX=0, int displacementY=0)=0
	It returns the text boundary (its enclose rectangle). More...

Visual and Style Configuration
Note that the visual (style and symbol) used to draw geometries is affected by the visual methods.
virtual void	setTextColor (const te::color::RGBAColor &color)=0
	It sets the text drawing color. More...

virtual void	setTextOpacity (int opacity)=0
	It sets the text opacity. More...

virtual void	setFontFamily (const std::string &family)=0
	It sets the text font family. More...

virtual void	setTextPointSize (double size)=0
	It sets the text point Size. More...

virtual void	setTextStyle (te::se::Font::FontStyleType style)=0
	It sets the text style. More...

virtual void	setTextWeight (te::se::Font::FontWeightType weight)=0
	It sets the text weight. More...

virtual void	setTextStretch (std::size_t stretch)=0
	It sets the text stretch. More...

virtual void	setTextUnderline (bool b)=0
	It sets the text underline flag. More...

virtual void	setTextOverline (bool b)=0
	It sets the text overline flag. More...

virtual void	setTextStrikeOut (bool b)=0
	It sets the text strike out flag. More...

virtual void	setTextDecorationColor (const te::color::RGBAColor &color)=0
	It sets the text color for drawing text decoration. More...

virtual void	setTextDecorationWidth (int width)=0
	It sets the width for drawing text decoration. More...

virtual void	setTextContourColor (const te::color::RGBAColor &color)=0
	It sets the text contour (outline) drawing color. More...

virtual void	setTextContourEnabled (bool b)=0
	It controls the display of the text outline. More...

virtual void	setTextContourOpacity (int opacity)=0
	It sets the text contour opacity. More...

virtual void	setTextContourWidth (int width)=0
	It sets the text contour width. More...

virtual void	setTextJustification (int justType)=0
	It sets the text justification for multi line text. More...

virtual void	setTextMultiLineSpacing (int spacing)=0
	It sets the multi line text spacing. More...

virtual void	setPointColor (const te::color::RGBAColor &color)=0
	It sets the point drawing color. More...

virtual void	setPointWidth (int w)=0
	It sets the point width. If point has a patterns, this pattern is scaled to width. More...

virtual void	setPointPattern (te::color::RGBAColor **pattern, int ncols, int nrows)=0
	It sets the point pattern. More...

virtual void	setPointPattern (char *pattern, std::size_t size, ImageType t)=0
	It sets the point pattern using a buffered image. More...

virtual void	setPointPatternRotation (const double &angle)=0
	It sets the point pattern rotation. Rotation is made from the center of the pattern. More...

virtual void	setPointPatternOpacity (int opacity)=0
	It sets the point pattern opacity. More...

virtual void	setLineColor (const te::color::RGBAColor &color)=0
	It sets the pen color used to draw line geometries. More...

virtual void	setLinePattern (te::color::RGBAColor **pattern, int ncols, int nrows)=0
	It sets the line pattern. More...

virtual void	setLinePattern (char *pattern, std::size_t size, ImageType t)=0
	It sets the line pattern using a buffered image. More...

virtual void	setLinePatternRotation (const double &angle)=0
	It sets the line pattern rotation. Rotation is made from the center of the pattern. More...

virtual void	setLinePatternOpacity (int opacity)=0
	It sets the line pattern opacity. More...

virtual void	setLineWidth (int w)=0
	It sets the line width. More...

virtual void	setLineDashStyle (LineDashStyle style)=0
	It sets the line dash style. More...

virtual void	setLineDashStyle (const std::vector< double > &style)=0
	It sets the line dash style to the given pattern. More...

virtual void	setLineCapStyle (LineCapStyle style)=0
	It sets the line cap style. More...

virtual void	setLineJoinStyle (LineJoinStyle style)=0
	It sets the line join style. More...

virtual void	setPolygonFillColor (const te::color::RGBAColor &color)=0
	It sets the color used to fill the draw of polygon geometries. More...

virtual void	setPolygonContourColor (const te::color::RGBAColor &color)=0
	It sets the pen color used to draw the boundary of polygon geometries. More...

virtual void	setPolygonFillPattern (te::color::RGBAColor **pattern, int ncols, int nrows)=0
	It sets the polygon fill pattern. More...

virtual void	setPolygonFillPattern (char *pattern, std::size_t size, ImageType t)=0
	It sets the polygon fill pattern using a buffered image. More...

virtual void	setPolygonPatternWidth (int w)=0
	It sets the polygon pattern width. More...

virtual void	setPolygonPatternRotation (const double &angle)=0
	It sets the polygon pattern rotation. More...

virtual void	setPolygonPatternOpacity (int opacity)=0
	It sets the polygon pattern opacity. More...

virtual void	setPolygonContourPattern (te::color::RGBAColor **pattern, int ncols, int nrows)=0
	It sets the pen pattern used to draw the boundary of polygon geometries. More...

virtual void	setPolygonContourPattern (char *pattern, std::size_t size, ImageType t)=0
	It sets the pen pattern used to draw the boundary of polygon geometries using a buffered image. More...

virtual void	setPolygonContourWidth (int w)=0
	It sets the polygon contour width. More...

virtual void	setPolygonContourPatternRotation (const double &angle)=0
	It sets the polygon contour pattern rotation. More...

virtual void	setPolygonContourPatternOpacity (int opacity)=0
	It sets the polygon contour pattern opacity. More...

virtual void	setPolygonContourDashStyle (LineDashStyle style)=0
	It sets the polygon contour dash style. More...

virtual void	setPolygonContourDashStyle (const std::vector< double > &style)=0
	It sets the polygon contour dash style to the given pattern. More...

virtual void	setPolygonContourCapStyle (LineCapStyle style)=0
	It sets the polygon contour cap style. More...

virtual void	setPolygonContourJoinStyle (LineJoinStyle style)=0
	It sets the polygon contour join style. More...

virtual void	setEraseMode ()=0
	It sets the painter to erase mode. More...

virtual void	setNormalMode ()=0
	It sets the painter to normal copy source to destination mode. More...

Detailed Description

A canvas is an abstraction of a drawing area.

What is a Canvas?

It is an abstraction of a drawing area. You can use it to:

draw geographical objects from a layer, with a given visual (or style);
draw texts;
draw the map legend;
create a chart.

The Canvas can be viewed as one of the rendering surface used by an application to show a map.

See also: te::qt::widgets::Canvas, te::agg::Canvas, te::gd::Canvas

Definition at line 92 of file Canvas.h.

Constructor & Destructor Documentation

te::map::Canvas::Canvas ( )

inline

Constructor.

Definition at line 102 of file Canvas.h.

virtual te::map::Canvas::~Canvas ( )

inlinevirtual

Virtual destructor.

Reimplemented in te::qt::widgets::Canvas.

Definition at line 105 of file Canvas.h.

Member Function Documentation

virtual void te::map::Canvas::calcAspectRatio	(	double &	llx,
		double &	lly,
		double &	urx,
		double &	ury,
		const AlignType	hAlign = `Center`,
		const AlignType	vAlign = `Center`
	)

pure virtual

It calculates the best aspect ratio for world (or window) coordinates area (supposing a cartesian reference system).

Parameters

llx	Lower left x-coordinate of the World.
lly	Lower left y-coordinate of the World.
urx	Upper right x-coordinate of the World.
ury	Upper right y-coordinate of the World.
hAlign	Horizontal Alignment. It can be left, center or right.
vAlign	Vertical Alignment. It can be top, center or bottom.

Note: The input coordinates will be adjusted according to the alignment parameters provided.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::calcAspectRatio	(	te::gm::Envelope *	envelope,
		const AlignType	hAlign = `Center`,
		const AlignType	vAlign = `Center`
	)

pure virtual

It calculates the best aspect ratio for world (or window) coordinates area (supposing a cartesian reference system).

Parameters

envelope	A rectangle with world coordinates that will be adjusted.
hAlign	Horizontal Alignment. It can be left, center or right.
vAlign	Vertical Alignment. It can be top, center or bottom.

Note: The input coordinates will be adjusted according to the alignment parameters provided.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::clear ( )

pure virtual

It clears the canvas content and fills with the background color.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::draw ( const te::gm::Geometry * geom )

pure virtual

It draws the geometry on canvas.

Parameters

geom	Any geometry (point, line, polygon, ...).

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::draw ( const te::gm::Point * point )

pure virtual

It draws the point on canvas.

Parameters

point The point.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::draw ( const te::gm::MultiPoint * mpoint )

pure virtual

It draws the MultiPoint on canvas.

Parameters

mpoint The MultiPoint.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::draw ( const te::gm::LineString * line )

pure virtual

It draws the LineString on canvas.

Parameters

line	The LineString.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::draw ( const te::gm::MultiLineString * mline )

pure virtual

It draws the MultiLineString on canvas.

Parameters

mline The MultiLineString.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::draw ( const te::gm::Polygon * poly )

pure virtual

It draws the polygon on canvas.

Parameters

poly	The polygon.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::draw ( const te::gm::MultiPolygon * mpoly )

pure virtual

It draws the MultiPolygon on canvas.

Parameters

mpoly The MultiPolygon.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::draw ( const te::gm::GeometryCollection * g )

pure virtual

It draws the GeometryCollection on canvas.

Parameters

g	The GeometryCollection.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::draw ( const te::gm::MultiSurface * g )

pure virtual

It draws the MultiSurface on canvas.

Parameters

g	The MultiSurface.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::drawImage	(	char *	src,
		std::size_t	size,
		ImageType	t
	)

pure virtual

It draws the src image over the canvas.

Parameters

src	A source image of any type (PNG, JPEG, GIF, ...).
size	The image size in bytes.
t	The image format type (see ImageType enum).

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::drawImage	(	te::color::RGBAColor **	src,
		int	w,
		int	h
	)

pure virtual

It draws the src image over the canvas.

Parameters

src	The source image.
w	The image width (number of columns).
h	The image height (number of rows).

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::drawImage	(	int	x,
		int	y,
		char *	src,
		std::size_t	size,
		ImageType	t
	)

pure virtual

It draws the src image over the canvas at the specified position (x, y).

Parameters

x	The canvas start position where the src image will be drawn.
y	The canvas start position where the src image will be drawn.
src	A source image of any type (PNG, JPEG, GIF, ...).
size	The image size in bytes.
t	The image format type (see ImageType enum).

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::drawImage	(	int	x,
		int	y,
		te::color::RGBAColor **	src,
		int	w,
		int	h
	)

pure virtual

It draws the src image over the canvas at the specified position (x, y).

Parameters

x	The canvas start position where the src image will be drawn.
y	The canvas start position where the src image will be drawn.
src	The source image.
w	The image width (number of columns).
h	The image height (number of rows).

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::drawImage	(	int	x,
		int	y,
		int	w,
		int	h,
		char *	src,
		std::size_t	size,
		ImageType	t
	)

pure virtual

It draws the source image into the rectangle at position (x, y) with the given width and height.

Parameters

x	The canvas start position where the src image will be drawn.
y	The canvas start position where the src image will be drawn.
w	The rectangle width.
h	The rectangle height.
src	A source image of any type (PNG, JPEG, GIF, ...).
size	The image size in bytes.
t	The image format type (see ImageType enum).

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::drawImage	(	int	x,
		int	y,
		int	w,
		int	h,
		te::color::RGBAColor **	src,
		int	srcw,
		int	srch
	)

pure virtual

It draws the source image into the rectangle at position (x, y) with the given width and height.

Parameters

x	The canvas start position where the src image will be drawn.
y	The canvas start position where the src image will be drawn.
w	The rectangle width.
h	The rectangle height.
src	The source image.
srcw	The source image width (number of columns).
srch	The source image height (number of rows).

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::drawImage	(	int	x,
		int	y,
		int	w,
		int	h,
		char *	src,
		std::size_t	size,
		ImageType	t,
		int	sx,
		int	sy,
		int	sw,
		int	sh
	)

pure virtual

It draws the rectangular portion with the origin (sx, sy), width sw and height sh, of the source image, at the point (x, y), with a width of w and a height of h. If sw or sh are equal to zero the width/height of the pixmap is used and adjusted by the offset sx/sy.

Parameters

x	The canvas start position where the src image will be drawn.
y	The canvas start position where the src image will be drawn.
w	The rectangle width.
h	The rectangle height.
src	A source image of any type (PNG, JPEG, GIF, ...).
size	The image size in bytes.
t	The image format type (see ImageType enum).
sx	The source image position.
sy	The source image position.
sw	The source image rectangle width.
sh	The source image rectangle height.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::drawImage	(	int	x,
		int	y,
		int	w,
		int	h,
		te::color::RGBAColor **	src,
		int	sx,
		int	sy,
		int	sw,
		int	sh
	)

pure virtual

It draws the rectangular portion with the origin (sx, sy), width sw and height sh, of the source image, at the point (x, y), with a width of w and a height of h. If sw or sh are equal to zero the width/height of the pixmap is used and adjusted by the offset sx/sy.

Parameters

x	The canvas start position where the src image will be drawn.
y	The canvas start position where the src image will be drawn.
w	The rectangle width.
h	The rectangle height.
src	The source image.
sx	The source image start position.
sy	The source image start position.
sw	The source image rectangle width.
sh	The source image rectangle height.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::drawImage	(	int	x,
		int	y,
		te::rst::Raster *	src,
		int	opacity = `TE_OPAQUE`
	)

pure virtual

It draws a raster over the canvas at the specified position (x, y). The raster must be with three 8-bit bands (1R, 2G, 3B),.

Parameters

x	The canvas start position in x where the raster image will be drawn.
y	The canvas start position in y where the raster image will be drawn.
src	The source raster.
opacity	The opacity value used to draw the image

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::drawImage	(	int	x,
		int	y,
		int	w,
		int	h,
		te::rst::Raster *	src,
		int	sx,
		int	sy,
		int	sw,
		int	sh,
		int	opacity = `TE_OPAQUE`
	)

pure virtual

It draws the rectangular portion with the origin (sx, sy), width sw and height sh, of the source raster, starting at the point (x, y), with a width of w and a height of h. If sw or sh are equal to zero the width/height of the pixmap is used and adjusted by the offset sx/sy.

Parameters

x	The canvas start position where the src image will be drawn.
y	The canvas start position where the src image will be drawn.
w	The rectangle width.
h	The rectangle height.
src	The source raster.
sx	The source image start position.
sy	The source image start position.
sw	The source image rectangle width.
sh	The source image rectangle height.
opacity	The opacity value used to draw the image

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::drawPixel	(	int	x,
		int	y
	)

pure virtual

It sets a pixel using the point pen.

Parameters

x	Column.
y	Row.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::drawPixel	(	int	x,
		int	y,
		const te::color::RGBAColor &	color
	)

pure virtual

It sets a pixel to a particular color.

The color must be an RGBA value. With the following range:

R: 0-255;
G: 0-255;
B: 0-255;
A: 0-255.

Parameters

x Column.

y Row.

color Pixel color.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::drawText	(	int	x,
		int	y,
		const std::string &	txt,
		float	angle = `0.0`,
		double	anchorX = `0.5`,
		double	anchorY = `0.5`,
		int	displacementX = `0`,
		int	displacementY = `0`
	)

pure virtual

It draws a text.

Color and font family should be defined in advance.

Parameters

x	The text entry point x in device coordinate.
y	The text entry point y in device coordinate.
txt	The text to be drawn.
angle	The text rotation.
anchorX	The horizontal text anchor.
anchorY	The vertical text anchor.
displacementX	The horizontal text displacement.
displacementY	The vertical text displacement.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::drawText	(	const te::gm::Point *	p,
		const std::string &	txt,
		float	angle = `0.0`,
		double	anchorX = `0.5`,
		double	anchorY = `0.5`,
		int	displacementX = `0`,
		int	displacementY = `0`
	)

pure virtual

It draws a text.

Color and font family should be defined in advance.

Parameters

p	The text entry point in world coordinate.
txt	The text to be drawn.
angle	The text rotation.
anchorX	The horizontal text anchor.
anchorY	The vertical text anchor.
displacementX	The horizontal text displacement.
displacementY	The vertical text displacement.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::drawText	(	const double &	x,
		const double &	y,
		const std::string &	txt,
		float	angle = `0.0`,
		double	anchorX = `0.5`,
		double	anchorY = `0.5`,
		int	displacementX = `0`,
		int	displacementY = `0`
	)

pure virtual

It draws a text.

Color and font family should be defined in advance.

Parameters

x	The text entry point x in world coordinate.
y	The text entry point y in world coordinate.
txt	The text to be drawn.
angle	The text rotation.
anchorX	The horizontal text anchor.
anchorY	The vertical text anchor.
displacementX	The horizontal text displacement.
displacementY	The vertical text displacement.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::freeImage ( char * img ) const

pure virtual

This is the method that you should use to release an image generated by the canvas.

Parameters

img	A pointer to an image previously created by the canvas.

Implemented in te::qt::widgets::Canvas.

virtual te::color::RGBAColor te::map::Canvas::getBackgroundColor ( ) const

pure virtual

It returns the canvas background color.

Returns: The canvas background color.

Implemented in te::qt::widgets::Canvas.

virtual int te::map::Canvas::getHeight ( ) const

pure virtual

It returns the canvas height.

Returns: The canvas height.

Implemented in te::qt::widgets::Canvas.

virtual char* te::map::Canvas::getImage	(	ImageType	t,
		std::size_t &	size,
		int	quality = `75`,
		int	fg = `0`
	)		const

pure virtual

It returns the internal content as an image in a specific format (PNG, JPEG, ...).

Parameters

t	The image format type (see ImageType enum).
size	The image size in bytes.
quality	JPEG quality, generally a value between 0 and 95.
fg	Foreground color for WBMP images.

Returns: The internal content as an image. The caller will take the ownership of the returned pointer.

Note: Use canvas freeImage in order to release the returned image resources.

Implemented in te::qt::widgets::Canvas.

virtual te::color::RGBAColor** te::map::Canvas::getImage	(	const int	x = `0`,
		const int	y = `0`,
		const int	w = `0`,
		const int	h = `0`
	)		const

pure virtual

It gets a RGBA color array from internal canvas buffer.

Returns: The Pointer RGBA colors.

Note: The caller of this method will take the ownership of the returned array.

Implemented in te::qt::widgets::Canvas.

virtual te::gm::Polygon* te::map::Canvas::getTextBoundary	(	int	x,
		int	y,
		const std::string &	txt,
		float	angle = `0.0`,
		double	anchorX = `0.5`,
		double	anchorY = `0.5`,
		int	displacementX = `0`,
		int	displacementY = `0`
	)

pure virtual

It returns the text boundary (its enclose rectangle).

Color and font family should be defined in advance.

Parameters

x	The text entry point x in device coordinate.
y	The text entry point y in device coordinate.
txt	The text to be drawn.
angle	The text rotation.
anchorX	The horizontal text anchor.
anchorY	The vertical text anchor.
displacementX	The horizontal text displacement.
displacementY	The vertical text displacement.

Returns: The text boundary in world coordinate.

Note: The caller of this method will take the ownership of the returned Polygon.

Implemented in te::qt::widgets::Canvas.

virtual te::gm::Polygon* te::map::Canvas::getTextBoundary	(	const te::gm::Point *	p,
		const std::string &	txt,
		float	angle = `0.0`,
		double	anchorX = `0.5`,
		double	anchorY = `0.5`,
		int	displacementX = `0`,
		int	displacementY = `0`
	)

pure virtual

It returns the text boundary (its enclose rectangle).

Color and font family should be defined in advance.

Parameters

p	The text entry point in world coordinate.
txt	The text to be drawn.
angle	The text rotation.
anchorX	The horizontal text anchor.
anchorY	The vertical text anchor.
displacementX	The horizontal text displacement.
displacementY	The vertical text displacement.

Returns: The text boundary in world coordinate.

Note: The caller of this method will take the ownership of the returned Polygon.

Implemented in te::qt::widgets::Canvas.

virtual te::gm::Polygon* te::map::Canvas::getTextBoundary	(	const double &	x,
		const double &	y,
		const std::string &	txt,
		float	angle = `0.0`,
		double	anchorX = `0.5`,
		double	anchorY = `0.5`,
		int	displacementX = `0`,
		int	displacementY = `0`
	)

pure virtual

It returns the text boundary (its enclose rectangle).

Color and font family should be defined in advance.

Parameters

x	The text entry point x in world coordinate.
y	The text entry point y in world coordinate.
txt	The text to be drawn.
angle	The text rotation.
anchorX	The horizontal text anchor.
anchorY	The vertical text anchor.
displacementX	The horizontal text displacement.
displacementY	The vertical text displacement.

Returns: The text boundary in world coordinates.

Note: The caller of this method will take the ownership of the returned Polygon.

Implemented in te::qt::widgets::Canvas.

virtual int te::map::Canvas::getWidth ( ) const

pure virtual

It returns the canvas width.

Returns: The canvas width.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::resize	(	int	w,
		int	h
	)

pure virtual

It adjusts the canvas size (width and height).

Parameters

w	The new canvas width.
h	The new canvas height.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::save	(	const char *	fileName,
		ImageType	t,
		int	quality = `75`,
		int	fg = `0`
	)		const

pure virtual

It saves the canvas content to a file image in the specified format type.

Parameters

fileName	The file name and path where the image will be saved.
t	The image format type (see ImageType enum).
quality	JPEG quality, generally a value between 0 and 95.
fg	Foreground color for WBMP images.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setBackgroundColor ( const te::color::RGBAColor & color )

pure virtual

It sets the canvas background color.

The default is totally transparent (255, 255, 255, 0).

Parameters

color The background color.

Note: When this method is called, all the canvas content is dropped out.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setEraseMode ( )

pure virtual

It sets the painter to erase mode.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setFontFamily ( const std::string & family )

pure virtual

It sets the text font family.

Parameters

family The new font family for drawing a text.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setLineCapStyle ( LineCapStyle style )

pure virtual

It sets the line cap style.

Parameters

style The line cap style.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setLineColor ( const te::color::RGBAColor & color )

pure virtual

It sets the pen color used to draw line geometries.

This method will drop any pattern or line style previously set.

Parameters

color The color to be used by the pen.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setLineDashStyle ( LineDashStyle style )

pure virtual

It sets the line dash style.

Parameters

style The line dash style.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setLineDashStyle ( const std::vector< double > & style )

pure virtual

It sets the line dash style to the given pattern.

Parameters

style The line custom dash style.

Note: The style should be specified as an even number of positive double where the entries 0, 2, 4, ... are dashes and 1, 3, 5, ... are spaces.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setLineJoinStyle ( LineJoinStyle style )

pure virtual

It sets the line join style.

Parameters

style The line join style.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setLinePattern	(	te::color::RGBAColor **	pattern,
		int	ncols,
		int	nrows
	)

pure virtual

It sets the line pattern.

The pattern is a matrix of int's, and each position corresponds to a RGBA color.

Parameters

pattern	The pattern matrix: a square matrix of int's where each position corresponds to a RGBA color.
ncols	Number of columns in the matrix.
nrows	Number of rows in the matrix.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setLinePattern	(	char *	pattern,
		std::size_t	size,
		ImageType	t
	)

pure virtual

It sets the line pattern using a buffered image.

Parameters

pattern	The buffered image.
size	The buffer image size.
t	The image type used by the style.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setLinePatternOpacity ( int opacity )

pure virtual

It sets the line pattern opacity.

Parameters

opacity The pattern opacity.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setLinePatternRotation ( const double & angle )

pure virtual

It sets the line pattern rotation. Rotation is made from the center of the pattern.

Parameters

angle The rotation angle in degress.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setLineWidth ( int w )

pure virtual

It sets the line width.

Parameters

w	The line width.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setNormalMode ( )

pure virtual

It sets the painter to normal copy source to destination mode.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setPointColor ( const te::color::RGBAColor & color )

pure virtual

It sets the point drawing color.

This method will instruct the canvas to draw points like pixels. Any pattern previously set will be released.

Parameters

color The new color for drawing a point.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setPointPattern	(	te::color::RGBAColor **	pattern,
		int	ncols,
		int	nrows
	)

pure virtual

It sets the point pattern.

The pattern is a matrix of int's, and each position corresponds to a RGBA color.

Parameters

pattern	The pattern matrix: a square matrix of int's where each position corresponds to a RGBA color.
ncols	Number of columns in the matrix.
nrows	Number of rows in the matrix.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setPointPattern	(	char *	pattern,
		std::size_t	size,
		ImageType	t
	)

pure virtual

It sets the point pattern using a buffered image.

Parameters

pattern	The buffered image.
size	The buffer image size.
t	The image type used by the style.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setPointPatternOpacity ( int opacity )

pure virtual

It sets the point pattern opacity.

Parameters

opacity The pattern opacity.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setPointPatternRotation ( const double & angle )

pure virtual

It sets the point pattern rotation. Rotation is made from the center of the pattern.

Parameters

angle The rotation angle in degress.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setPointWidth ( int w )

pure virtual

It sets the point width. If point has a patterns, this pattern is scaled to width.

Parameters

w	The width used to draw point.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setPolygonContourCapStyle ( LineCapStyle style )

pure virtual

It sets the polygon contour cap style.

Parameters

style The polygon contour cap style.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setPolygonContourColor ( const te::color::RGBAColor & color )

pure virtual

It sets the pen color used to draw the boundary of polygon geometries.

Parameters

color The color to be used to outline a polygon.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setPolygonContourDashStyle ( LineDashStyle style )

pure virtual

It sets the polygon contour dash style.

Parameters

style The polygon contour dash style.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setPolygonContourDashStyle ( const std::vector< double > & style )

pure virtual

It sets the polygon contour dash style to the given pattern.

Parameters

style The polygon contour custom dash style.

Note: The style should be specified as an even number of positive double where the entries 0, 2, 4, ... are dashes and 1, 3, 5, ... are spaces.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setPolygonContourJoinStyle ( LineJoinStyle style )

pure virtual

It sets the polygon contour join style.

Parameters

style The polygon contour join style.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setPolygonContourPattern	(	te::color::RGBAColor **	pattern,
		int	ncols,
		int	nrows
	)

pure virtual

It sets the pen pattern used to draw the boundary of polygon geometries.

The pattern is a matrix of int's, and each position corresponds to a RGBA color.

Parameters

pattern	The pattern matrix: a square matrix of int's where each position corresponds to a RGBA color.
ncols	Number of columns in the matrix.
nrows	Number of rows in the matrix.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setPolygonContourPattern	(	char *	pattern,
		std::size_t	size,
		ImageType	t
	)

pure virtual

It sets the pen pattern used to draw the boundary of polygon geometries using a buffered image.

Parameters

pattern	The buffered image.
size	The buffer image size.
t	The image type used by the style.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setPolygonContourPatternOpacity ( int opacity )

pure virtual

It sets the polygon contour pattern opacity.

Parameters

opacity The pattern opacity.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setPolygonContourPatternRotation ( const double & angle )

pure virtual

It sets the polygon contour pattern rotation.

Parameters

angle The rotation angle in degress.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setPolygonContourWidth ( int w )

pure virtual

It sets the polygon contour width.

Parameters

w	The contour width.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setPolygonFillColor ( const te::color::RGBAColor & color )

pure virtual

It sets the color used to fill the draw of polygon geometries.

Parameters

color The color to be used when filling a polygon.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setPolygonFillPattern	(	te::color::RGBAColor **	pattern,
		int	ncols,
		int	nrows
	)

pure virtual

It sets the polygon fill pattern.

The pattern is a matrix of int's, and each position corresponds to a RGBA color.

Parameters

pattern	The style matrix: a square matrix of int's where each position corresponds to a RGBA color.
ncols	Number of columns in the matrix.
nrows	Number of rows in the matrix.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setPolygonFillPattern	(	char *	pattern,
		std::size_t	size,
		ImageType	t
	)

pure virtual

It sets the polygon fill pattern using a buffered image.

Parameters

pattern	The buffered image.
size	The buffer image size.
t	The image type used by the style.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setPolygonPatternOpacity ( int opacity )

pure virtual

It sets the polygon pattern opacity.

Parameters

opacity The pattern opacity.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setPolygonPatternRotation ( const double & angle )

pure virtual

It sets the polygon pattern rotation.

Parameters

angle The rotation angle in degress.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setPolygonPatternWidth ( int w )

pure virtual

It sets the polygon pattern width.

Parameters

w	The pattern width.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setTextColor ( const te::color::RGBAColor & color )

pure virtual

It sets the text drawing color.

Parameters

color The new color for drawing a text.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setTextContourColor ( const te::color::RGBAColor & color )

pure virtual

It sets the text contour (outline) drawing color.

Parameters

color The new color for drawing the contour of texts.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setTextContourEnabled ( bool b )

pure virtual

It controls the display of the text outline.

Parameters

b	True to display and false to not display.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setTextContourOpacity ( int opacity )

pure virtual

It sets the text contour opacity.

Parameters

opacity The new opacity for drawing the text contour.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setTextContourWidth ( int width )

pure virtual

It sets the text contour width.

Parameters

width The new width for drawing the text contour.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setTextDecorationColor ( const te::color::RGBAColor & color )

pure virtual

It sets the text color for drawing text decoration.

Parameters

color The new color for drawing text decoration.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setTextDecorationWidth ( int width )

pure virtual

It sets the width for drawing text decoration.

Parameters

width The new width for drawing text decoration.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setTextJustification ( int justType )

pure virtual

It sets the text justification for multi line text.

Parameters

just	The new justification for drawing a multi line text.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setTextMultiLineSpacing ( int spacing )

pure virtual

It sets the multi line text spacing.

Parameters

spacing The new spacing for drawing a multi line text.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setTextOpacity ( int opacity )

pure virtual

It sets the text opacity.

Parameters

opacity The new opacity for drawing a text.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setTextOverline ( bool b )

pure virtual

It sets the text overline flag.

Parameters

b	True: for overline. False otherwise.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setTextPointSize ( double size )

pure virtual

It sets the text point Size.

Parameters

size	The new point size for drawing a text.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setTextStretch ( std::size_t stretch )

pure virtual

It sets the text stretch.

Parameters

stretch The new stretch for drawing a text.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setTextStrikeOut ( bool b )

pure virtual

It sets the text strike out flag.

Parameters

b	True: for strike out. False otherwise.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setTextStyle ( te::se::Font::FontStyleType style )

pure virtual

It sets the text style.

Parameters

style The new style for drawing a text.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setTextUnderline ( bool b )

pure virtual

It sets the text underline flag.

Parameters

b	True: for underline. False otherwise.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setTextWeight ( te::se::Font::FontWeightType weight )

pure virtual

It sets the text weight.

Parameters

weight The new weight for drawing a text.

Implemented in te::qt::widgets::Canvas.

virtual void te::map::Canvas::setWindow	(	const double &	llx,
		const double &	lly,
		const double &	urx,
		const double &	ury
	)

pure virtual

It sets the world (or window) coordinates area (supposing a cartesian reference system).

Parameters

llx	Lower left x-coordinate of the World.
lly	Lower left y-coordinate of the World.
urx	Upper right x-coordinate of the World.
ury	Upper right y-coordinate of the World.

Note: The coordinates must be in the Spatial Reference System of the features to be drawn in canvas.

Implemented in te::qt::widgets::Canvas.

The documentation for this class was generated from the following file:

/home/castejon/castejon_files/develop/terralib5/git_master/src/terralib/maptools/Canvas.h

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

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