Implements the Renderer2D interface on top of the Cairo 2D Graphics Library. More...

Inheritance diagram for CDPL.Vis.CairoBackend.CairoRenderer2D:

Public Member Functions
None	__init__ (cairo.Context cairo_ctxt)
	Constructs a renderer object that operates on the Cairo cdrawing ontext specified by cairo_ctxt. More...

None	saveState ()
	Saves the current renderer state. More...

None	restoreState ()
	Restores the last renderer state saved by a call to saveState(). More...

None	setTransform (Math.Matrix3D xform)
	Sets the applied affine transformation matrix to xform. More...

None	transform (Math.Matrix3D xform)
	Multiplies the current affine transformation matrix by xform. More...

None	setPen (Vis.Pen pen)
	Sets the pen to be used in subsequent drawing operations. More...

None	setBrush (Vis.Brush brush)
	Sets the brush to be used in subsequent drawing operations. More...

None	setFont (Vis.Font font)
	Sets the font to be used in subsequent text drawing operations. More...

None	drawRectangle (float x, float y, float width, float height)
	Draws an axis aligned rectangle of the specified width and height whose upper-left corner is located at (x, y). More...

None	drawPolygon (Math.Vector2DArray points)
	Draws the polygon defined by points. More...

None	drawLine (float x1, float y1, float x2, float y2)
	Draws a line segment from (x1, y1) to (x2, y2). More...

None	drawPolyline (Math.Vector2DArray points)
	Draws the polyline defined by points. More...

None	drawLineSegments (Math.Vector2DArray points)
	Draws the sequence of disjoint line segments defined by points. More...

None	drawPoint (float x, float y)
	Draws a point at the position (x, y). More...

None	drawEllipse (float x, float y, float width, float height)
	Draws an ellipse with the given width and height around the center position (x, y). More...

None	drawText (float x, float y, str txt)
	Draws the specified text at the position (x, y). More...

None	drawPath (Vis.Path2D path)
	Draws the given path. More...

None	setClipPath (Vis.Path2D path)

None	clearClipPath ()
	Disables clipping.

Public Member Functions inherited from CDPL.Vis.Renderer2D
None	__init__ ()
	Initializes the Renderer2D instance.

int	getObjectID ()
	Returns the numeric identifier (ID) of the wrapped C++ class instance. More...

None	setPen (Pen pen)
	Sets the pen to be used in subsequent drawing operations. More...

None	setBrush (Brush brush)
	Sets the brush to be used in subsequent drawing operations. More...

None	setFont (Font font)
	Sets the font to be used in subsequent text drawing operations. More...

None	drawPath (Path2D path)
	Draws the given path. More...

None	setClipPath (Path2D path)

Additional Inherited Members
Properties inherited from CDPL.Vis.Renderer2D
	objectID = property(getObjectID)

Detailed Description

Implements the Renderer2D interface on top of the Cairo 2D Graphics Library.

For more information about the Cairo 2D Graphics Library see [CAIRO].

Constructor & Destructor Documentation

◆ init()

None CDPL.Vis.CairoBackend.CairoRenderer2D.__init__ ( cairo.Context cairo_ctxt )

Constructs a renderer object that operates on the Cairo cdrawing ontext specified by cairo_ctxt.

Parameters

cairo_ctxt The Cairo drawing context.

Exceptions

Base.NullPointerException if cairo_ctxt is None.

Member Function Documentation

◆ saveState()

None CDPL.Vis.CairoBackend.CairoRenderer2D.saveState ( )

Saves the current renderer state.

The method saves the current pen, brush, font and transformation matrix on an internal stack. The last saved state can be restored later on by a call to restoreState().

See also: restoreState()

Reimplemented from CDPL.Vis.Renderer2D.

◆ restoreState()

None CDPL.Vis.CairoBackend.CairoRenderer2D.restoreState ( )

Restores the last renderer state saved by a call to saveState().

See also: saveState()

Reimplemented from CDPL.Vis.Renderer2D.

◆ setTransform()

None CDPL.Vis.CairoBackend.CairoRenderer2D.setTransform ( Math.Matrix3D xform )

Sets the applied affine transformation matrix to xform.

Parameters

xform The new affine transformation matrix.

Reimplemented from CDPL.Vis.Renderer2D.

◆ transform()

None CDPL.Vis.CairoBackend.CairoRenderer2D.transform ( Math.Matrix3D xform )

Multiplies the current affine transformation matrix by xform.

Parameters

xform The matrix by which the current affine transformation matrix is multiplied.

Reimplemented from CDPL.Vis.Renderer2D.

◆ setPen()

None CDPL.Vis.CairoBackend.CairoRenderer2D.setPen ( Vis.Pen pen )

Sets the pen to be used in subsequent drawing operations.

Parameters

pen	The new pen for subsequent drawing operations.

See also: Vis.Pen

◆ setBrush()

None CDPL.Vis.CairoBackend.CairoRenderer2D.setBrush ( Vis.Brush brush )

Sets the brush to be used in subsequent drawing operations.

Parameters

brush The new brush for subsequent drawing operations.

See also: Vis.Brush

◆ setFont()

None CDPL.Vis.CairoBackend.CairoRenderer2D.setFont ( Vis.Font font )

Sets the font to be used in subsequent text drawing operations.

Parameters

font	The new font used in subsequent text drawing operations.

See also: Vis.Font

◆ drawRectangle()

None CDPL.Vis.CairoBackend.CairoRenderer2D.drawRectangle	(	float	x,
		float	y,
		float	width,
		float	height
	)

Draws an axis aligned rectangle of the specified width and height whose upper-left corner is located at (x, y).

The rectangle is filled as specified by the current brush and the outline will be drawn as specified by the current pen.

Parameters

x	The x-coordinate of the upper-left corner.
y	The y-coordinate of the upper-left corner.
width	The width of the rectangle.
height	The height of the rectangle.

See also: setPen(), setBrush()

Reimplemented from CDPL.Vis.Renderer2D.

◆ drawPolygon()

None CDPL.Vis.CairoBackend.CairoRenderer2D.drawPolygon ( Math.Vector2DArray points )

Draws the polygon defined by points.

For a given set of \( N \) corner points \( p_i \) with \( i = 1, 2, \ldots, N \), the polygon's \( N \) edges are given by \( (p_1, p_2), (p_2, p_3), \ldots, (p_N, p_0) \). The polygon is filled as specified by the current brush and the outline will be drawn as specified by the current pen.

Parameters

points An array of points specifying the corners of the polygon.

See also: setPen(), setBrush()

Reimplemented from CDPL.Vis.Renderer2D.

◆ drawLine()

None CDPL.Vis.CairoBackend.CairoRenderer2D.drawLine	(	float	x1,
		float	y1,
		float	x2,
		float	y2
	)

Draws a line segment from (x1, y1) to (x2, y2).

The line style, color, cap style and line width is specified by the current pen.

Parameters

x1	The x-coordinate of the starting point.
y1	The y-coordinate of the starting point.
x2	The x-coordinate of the end point.
y2	The y-coordinate of the end point.

See also: setPen()

Reimplemented from CDPL.Vis.Renderer2D.

◆ drawPolyline()

None CDPL.Vis.CairoBackend.CairoRenderer2D.drawPolyline ( Math.Vector2DArray points )

Draws the polyline defined by points.

For a given set of \( N \) points \( p_i \) with \( i = 1, 2, \ldots, N \), \( N - 1 \) connected line segments \( (p_1, p_2), (p_2, p_3), \ldots, (p_{N - 1}, p_N) \) will be drawn. The line style, color, cap style, join style and line width is specified by the current pen.

Parameters

points An array of points defining the polyline.

See also: setPen()

Reimplemented from CDPL.Vis.Renderer2D.

◆ drawLineSegments()

None CDPL.Vis.CairoBackend.CairoRenderer2D.drawLineSegments ( Math.Vector2DArray points )

Draws the sequence of disjoint line segments defined by points.

For a given set of \( 2N \) points \( p_i \) with \( i = 1, 2, \ldots, 2N \), \( N \) disjoint line segments \( (p_1, p_2), (p_3, p_4), \ldots, (p_{2N - 1}, p_2N) \) will be drawn. The line style, color, cap style and line width is specified by the current pen.

Parameters

points An array of points defining the line segments.

See also: setPen()

Reimplemented from CDPL.Vis.Renderer2D.

◆ drawPoint()

None CDPL.Vis.CairoBackend.CairoRenderer2D.drawPoint	(	float	x,
		float	y
	)

Draws a point at the position (x, y).

The diameter and color of the point is specified by the current pen.

Parameters

x	The x-coordinate of the point.
y	The y-coordinate of the point.

See also: setPen()

Reimplemented from CDPL.Vis.Renderer2D.

◆ drawEllipse()

None CDPL.Vis.CairoBackend.CairoRenderer2D.drawEllipse	(	float	x,
		float	y,
		float	width,
		float	height
	)

Draws an ellipse with the given width and height around the center position (x, y).

The ellipse is filled as specified by the current brush and the outline will be drawn as specified by the current pen.

Parameters

x	The x-coordinate of the center point.
y	The y-coordinate of the center point.
width	The width of the ellipse.
height	The height of the ellipse.

See also: setPen(), setBrush()

Reimplemented from CDPL.Vis.Renderer2D.

◆ drawText()

None CDPL.Vis.CairoBackend.CairoRenderer2D.drawText	(	float	x,
		float	y,
		str	txt
	)

Draws the specified text at the position (x, y).

The text color is specified by the current pen. The font has to be specified by setFont().

Parameters

x	The x-position of the drawn text.
y	The y-position of the baseline.
txt	The text to draw.

See also: setPen(), setFont()

Reimplemented from CDPL.Vis.Renderer2D.

◆ drawPath()

None CDPL.Vis.CairoBackend.CairoRenderer2D.drawPath ( Vis.Path2D path )

Draws the given path.

The path is filled as specified by the current brush and the outline will be drawn as specified by the current pen.

Parameters

path	The path to draw.

See also: setPen(), setBrush()

◆ setClipPath()

None CDPL.Vis.CairoBackend.CairoRenderer2D.setClipPath ( Vis.Path2D path )

Parameters

path

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ __init__()

Member Function Documentation

◆ saveState()

◆ restoreState()

◆ setTransform()

◆ transform()

◆ setPen()

◆ setBrush()

◆ setFont()

◆ drawRectangle()

◆ drawPolygon()

◆ drawLine()

◆ drawPolyline()

◆ drawLineSegments()

◆ drawPoint()

◆ drawEllipse()

◆ drawText()

◆ drawPath()

◆ setClipPath()

◆ init()