Wt::WPainter Class Reference
[Painting system]

Helper class for painting on a WPaintDevice. More...

#include <Wt/WPainter>

List of all members.

Public Types

enum  RenderHint { Antialiasing = 0X1 }
 Enumeration for render hints. More...

Public Member Functions

 WPainter ()
 Default constructor.
 WPainter (WPaintDevice *device)
 Create a paint and initialize it for a paint device.
 ~WPainter ()
 Destructor.
bool begin (WPaintDevice *device)
 Begin painting on a paint device.
bool isActive () const
 Return whether this painter is active on a paint device.
bool end ()
 End painting.
WPaintDevicedevice () const
 The device on which this painter is active (or 0 if not active).
void setRenderHint (RenderHint hint, bool on=true)
 Set a render hint.
int renderHints () const
 Get the current render hints.
void drawArc (const WRectF &rectangle, int startAngle, int spanAngle)
 Draw an arc.
void drawArc (double x, double y, double width, double height, int startAngle, int spanAngle)
 Draw an arc.
void drawChord (const WRectF &rectangle, int startAngle, int spanAngle)
 Draw a chord.
void drawChord (double x, double y, double width, double height, int startAngle, int spanAngle)
 Draw a chord.
void drawEllipse (const WRectF &rectangle)
 Draw an ellipse.
void drawEllipse (double x, double y, double width, double height)
 Draw an ellipse.
void drawImage (const WPointF &point, const Image &image)
 Draw an image.
void drawImage (const WPointF &point, const Image &image, const WRectF &sourceRect)
 Draw part of an image.
void drawImage (const WRectF &rect, const Image &image)
 Draw an image inside a rectangle.
void drawImage (const WRectF &rect, const Image &image, const WRectF &sourceRect)
 Draw part of an image inside a rectangle.
void drawImage (double x, double y, const Image &image, double sx=0, double sy=0, double sw=-1, double sh=-1)
 Draw part of an image.
void drawLine (const WLineF &line)
 Draw a line.
void drawLine (const WPointF &p1, const WPointF &p2)
 Draw a line.
void drawLine (double x1, double y1, double x2, double y2)
 Draw a line.
void drawLines (const WT_ARRAY WLineF *lines, int lineCount)
 Draws an array of lines.
void drawLines (const WT_ARRAY WPointF *pointPairs, int lineCount)
 Draws an array of lines.
void drawLines (const std::vector< WLineF > &lines)
 Draws an array of lines.
void drawLines (const std::vector< WPointF > &pointPairs)
 Draws an array of lines.
void drawPath (const WPainterPath &path)
 Draw a (complex) path.
void drawPie (const WRectF &rectangle, int startAngle, int spanAngle)
 Draw a pie.
void drawPie (double x, double y, double width, double height, int startAngle, int spanAngle)
 Draw a pie.
void drawPoint (const WPointF &position)
 Draw a point.
void drawPoint (double x, double y)
 Draw a point.
void drawPoints (const WT_ARRAY WPointF *points, int pointCount)
 Draw a number of points.
void drawPolygon (const WT_ARRAY WPointF *points, int pointCount)
 Draw a polygon.
void drawPolyline (const WT_ARRAY WPointF *points, int pointCount)
 Draw a polyline.
void drawRect (const WRectF &rectangle)
 Draw a rectangle.
void drawRect (double x, double y, double width, double height)
 Draw a rectangle.
void drawRects (const WT_ARRAY WRectF *rectangles, int rectCount)
 Draw a number of rectangles.
void drawRects (const std::vector< WRectF > &rectangles)
 Draw a number of rectangles.
void drawText (const WRectF &rectangle, WFlags< AlignmentFlag > flags, const WString &text)
 Draw text.
void drawText (double x, double y, double width, double height, WFlags< AlignmentFlag > flags, const WString &text)
 Draw text.
void fillPath (const WPainterPath &path, const WBrush &brush)
 Fill a (complex) path.
void fillRect (const WRectF &rectangle, const WBrush &brush)
 Fill a rectangle.
void fillRect (double x, double y, double width, double height, const WBrush &brush)
 Fill a rectangle.
void strokePath (const WPainterPath &path, const WPen &pen)
 Stroke a path.
void setBrush (const WBrush &brush)
 Change the fill style.
void setFont (const WFont &font)
 Change the font.
void setPen (const WPen &pen)
 Change the pen.
const WBrushbrush () const
 Returns the current brush.
const WFontfont () const
 Returns the current font.
const WPenpen () const
 Returns the current pen.
void setClipping (bool enable)
 Enable or disable clipping.
bool hasClipping () const
 Return whether clipping is enabled.
void setClipPath (const WPainterPath &clipPath)
 Set the clip path.
WPainterPath clipPath () const
 Get the clip path.
void resetTransform ()
 Reset the current transformation.
void rotate (double angle)
 Rotate the logical coordinate system.
void scale (double sx, double sy)
 Scale the logical coordinate system.
void translate (const WPointF &offset)
 Translate the origin of the logical coordinate system.
void translate (double dx, double dy)
 Translate the origin of the logical coordinate system.
void setWorldTransform (const WTransform &matrix, bool combine=false)
 Set a transformation for the logical coordinate system.
const WTransformworldTransform () const
 Get the current world transformation matrix.
void save ()
 Save the current state.
void restore ()
 Get the last save state.
void setViewPort (const WRectF &viewPort)
 Set the viewport.
void setViewPort (double x, double y, double width, double height)
 Set the viewport.
WRectF viewPort () const
 Returns the viewport.
void setWindow (const WRectF &window)
 Set the window.
void setWindow (double x, double y, double width, double height)
 Set the window.
WRectF window () const
 Returns the current window.
WTransform combinedTransform () const
 Returns the combined transformation matrix.

Classes

class  Image
 An image that can be rendered on a WPainter. More...


Detailed Description

Helper class for painting on a WPaintDevice.

The painter class provides a rich interface for painting on a WPaintDevice. To start painting on a device, either pass the device through the constructor WPainter(WPaintDevice *), or use begin(WPaintDevice *). Typically, you will instantiate a WPainter from within the WPaintedWidget::paintEvent() method, but you can also use a painter to paint directly to a particular paint device, for example to create an SVG image.

The painter maintains state such as the current pen, brush, font, transformation and clipping settings (see setClipping() and setClipPath()). A particular state can be saved using save() and later restored using restore().

The painting system distinguishes between device coordinates, logical coordinates, and local coordinates. The device coordinate system ranges from (0, 0) in the top left corner of the device, to (device()->width(), device()->height()) for the bottom right corner. The logical coordinate system defines a coordinate system that may be chosen independent of the geometry of the device, which is convenient to make abstraction of the actual device size. Finally, the current local coordinate system may be different from the logical coordinate system because of a world transformation. Initially, the local coordinate system coincides with the logical coordinate system, which coincides with the device coordinate system.

By setting a viewPort() and a window(), a viewPort transformation is defined which maps logical coordinates onto device coordinates. By changing the world transformation (using setWorldTransform(), or translate(), rotate(), scale() operations), it is defined how current local coordinates map onto logical coordinates.

Although the painter has support for clipping using an arbitrary path, not all devices support clipping.

Usage example:

 class MyPaintedWidget : public Wt::WPaintedWidget
 {
 public:
   MyPaintedWidget(Wt::WContainerWidget *parent = 0)
     : Wt::WPaintedWidget(parent),
       foo_(100)
   {
      resize(200, 200); // provide a default size
   }

   void setFoo(int foo) {
      foo_ = foo;
      update(); // trigger a repaint
   }

 protected:
   void paintEvent(Wt::WPaintedWidget *paintDevice) {
     Wt::WPainter painter(paintDevice);
     painter.drawLine(20, 20, foo_, foo_);
     ...
   }

 private:
   int foo_;
 };

See also:
WPaintedWidget::paintEvent(WPaintDevice *)

Member Enumeration Documentation

Enumeration for render hints.

Enumerator:
Antialiasing  Antialiasing.


Constructor & Destructor Documentation

Wt::WPainter::WPainter (  ) 

Default constructor.

Before painting, you must invoke begin(WPaintDevice *) on a paint device.

See also:
WPainter(WPaintDevice *)


Member Function Documentation

bool Wt::WPainter::begin ( WPaintDevice device  ) 

Begin painting on a paint device.

Starts painting on a paint device. The paint device is automatically cleared to become entirely transparent.

See also:
end(), isActive()

bool Wt::WPainter::isActive (  )  const

Return whether this painter is active on a paint device.

See also:
begin(WPaintDevice *), end()

bool Wt::WPainter::end (  ) 

End painting.

This method is called automatically from the destructor.

WPaintDevice* Wt::WPainter::device (  )  const [inline]

The device on which this painter is active (or 0 if not active).

See also:
begin(WPaintDevice *), WPainter(WPaintDevice *), isActive()

void Wt::WPainter::setRenderHint ( RenderHint  hint,
bool  on = true 
)

Set a render hint.

Renderers may ignore particular hints for which they have no support.

int Wt::WPainter::renderHints (  )  const [inline]

Get the current render hints.

Returns the logical OR of render hints currently set.

See also:
setRenderHint(RenderHint, bool).

void Wt::WPainter::drawArc ( const WRectF rectangle,
int  startAngle,
int  spanAngle 
)

Draw an arc.

Draws an arc using the current pen, and fills using the current brush.

The arc is defined as a segment from an ellipse, which fits in the rectangle. The segment starts at startAngle, and spans an angle given by spanAngle. These angles have as unit 1/16th of a degree, and are measured counter-clockwise starting from the 3 o'clock position.

See also:
drawEllipse(const WRectF&), drawChord(const WRectF&, int, int)

drawArc(double, double, double, double, int, int)

void Wt::WPainter::drawArc ( double  x,
double  y,
double  width,
double  height,
int  startAngle,
int  spanAngle 
)

Draw an arc.

This is an overloaded method for convenience.

See also:
drawArc(const WRectF&, int, int)

void Wt::WPainter::drawChord ( const WRectF rectangle,
int  startAngle,
int  spanAngle 
)

Draw a chord.

Draws an arc using the current pen, and connects start and end point with a line. The area is filled using the current brush.

The arc is defined as a segment from an ellipse, which fits in the rectangle. The segment starts at startAngle, and spans an angle given by spanAngle. These angles have as unit 1/16th of a degree, and are measured counter-clockwise starting at 3 o'clock.

See also:
drawEllipse(const WRectF&), drawArc(const WRectF&, int, int)

drawChord(double, double, double, double, int, int)

void Wt::WPainter::drawChord ( double  x,
double  y,
double  width,
double  height,
int  startAngle,
int  spanAngle 
)

Draw a chord.

This is an overloaded method for convenience.

See also:
drawChord(const WRectF&, int, int)

void Wt::WPainter::drawEllipse ( const WRectF rectangle  ) 

Draw an ellipse.

Draws an ellipse using the current pen and fills it using the current brush.

The ellipse is defined as being bounded by the rectangle.

See also:
drawArc(const WRectF&, int, int)

drawEllipse(double, double, double, double)

void Wt::WPainter::drawEllipse ( double  x,
double  y,
double  width,
double  height 
)

Draw an ellipse.

This is an overloaded method for convenience.

See also:
drawEllipse(const WRectF&)

void Wt::WPainter::drawImage ( const WPointF point,
const Image image 
)

Draw an image.

Draws the image so that the top left corner corresponds to point.

This is an overloaded method provided for convenience.

void Wt::WPainter::drawImage ( const WPointF point,
const Image image,
const WRectF sourceRect 
)

Draw part of an image.

Draws the sourceRect rectangle from an image to the location point.

This is an overloaded method provided for convenience.

void Wt::WPainter::drawImage ( const WRectF rect,
const Image image 
)

Draw an image inside a rectangle.

Draw the image inside rect (If necessary, the image is scaled to fit into the rectangle).

This is an overloaded method provided for convenience.

void Wt::WPainter::drawImage ( const WRectF rect,
const Image image,
const WRectF sourceRect 
)

Draw part of an image inside a rectangle.

Draws the sourceRect rectangle from an image inside rect (If necessary, the image is scaled to fit into the rectangle).

void Wt::WPainter::drawImage ( double  x,
double  y,
const Image image,
double  sx = 0,
double  sy = 0,
double  sw = -1,
double  sh = -1 
)

Draw part of an image.

Draws the sourceRect rectangle with top left corner (sx, sy) and size sw x sh from an image to the location (x, y).

void Wt::WPainter::drawLine ( const WLineF line  ) 

Draw a line.

Draws a line using the current pen.

See also:
drawLine(const WPointF&, const WPointF&), drawLine(double, double, double, double)

void Wt::WPainter::drawLine ( const WPointF p1,
const WPointF p2 
)

Draw a line.

Draws a line defined by two points.

See also:
drawLine(const WLine&), drawLine(double, double, double, double)

void Wt::WPainter::drawLine ( double  x1,
double  y1,
double  x2,
double  y2 
)

Draw a line.

Draws a line defined by two points.

See also:
drawLine(const WLine&), drawLine(const WPointF&, const WPointF&)

void Wt::WPainter::drawLines ( const WT_ARRAY WLineF lines,
int  lineCount 
)

Draws an array of lines.

Draws the lineCount first lines from the given array of lines.

void Wt::WPainter::drawLines ( const WT_ARRAY WPointF pointPairs,
int  lineCount 
)

Draws an array of lines.

Draws lineCount lines, where each line is specified using a begin and end point that are read from an array. Thus, the pointPairs array must have at least 2*lineCount points.

void Wt::WPainter::drawLines ( const std::vector< WLineF > &  lines  ) 

Draws an array of lines.

Draws the lines given in the vector.

void Wt::WPainter::drawLines ( const std::vector< WPointF > &  pointPairs  ) 

Draws an array of lines.

Draws a number of lines that are specified by pairs of begin- and endpoints. The vector should hold a number of points that is a multiple of two.

void Wt::WPainter::drawPath ( const WPainterPath path  ) 

Draw a (complex) path.

Draws and fills the given path using the current pen and brush.

See also:
strokePath(const WPainterPath&, const WPen&), fillPath(const WPainterPath&, const WBrush&)

void Wt::WPainter::drawPie ( const WRectF rectangle,
int  startAngle,
int  spanAngle 
)

Draw a pie.

Draws an arc using the current pen, and connects start and end point with the center of the corresponding ellipse. The area is filled using the current brush.

The arc is defined as a segment from an ellipse, which fits in the rectangle. The segment starts at startAngle, and spans an angle given by spanAngle. These angles have as unit 1/16th of a degree, and are measured counter-clockwise starting at 3 o'clock.

See also:
drawEllipse(const WRectF&), drawArc(const WRectF&, int, int)

drawPie(double, double, double, double, int, int)

void Wt::WPainter::drawPie ( double  x,
double  y,
double  width,
double  height,
int  startAngle,
int  spanAngle 
)

Draw a pie.

This is an overloaded method for convenience.

See also:
drawPie(const WRectF&, int, int)

void Wt::WPainter::drawPoint ( const WPointF position  ) 

Draw a point.

Draw a single point using the current pen.

See also:
drawPoint(double, double)

void Wt::WPainter::drawPoint ( double  x,
double  y 
)

Draw a point.

This is an overloaded method for convenience.

See also:
drawPoint(const WPointF&)

void Wt::WPainter::drawPoints ( const WT_ARRAY WPointF points,
int  pointCount 
)

Draw a number of points.

Draws the pointCount first points from the given array of points.

See also:
drawPoint(const WPointF&)

void Wt::WPainter::drawPolygon ( const WT_ARRAY WPointF points,
int  pointCount 
)

Draw a polygon.

Draws a polygon that is specified by a list of points, using the current pen. The polygon is closed by connecting the last point with the first point, and filled using the current brush.

See also:
drawPath(const WPainterPath&), drawPolyline(const WPointF *, int)

void Wt::WPainter::drawPolyline ( const WT_ARRAY WPointF points,
int  pointCount 
)

Draw a polyline.

Draws a polyline that is specified by a list of points, using the current pen.

See also:
drawPath(const WPainterPath&), drawPolygon(const WPointF *, int)

void Wt::WPainter::drawRect ( const WRectF rectangle  ) 

Draw a rectangle.

Draws and fills a rectangle using the current pen and brush.

See also:
drawRect(double, double, double, double)

void Wt::WPainter::drawRect ( double  x,
double  y,
double  width,
double  height 
)

Draw a rectangle.

This is an overloaded method for convenience.

See also:
drawRect(const WRectF&)

void Wt::WPainter::drawRects ( const WT_ARRAY WRectF rectangles,
int  rectCount 
)

Draw a number of rectangles.

Draws and fills the rectCount first rectangles from the given array, using the current pen and brush.

See also:
drawRect(const WRectF&)

void Wt::WPainter::drawRects ( const std::vector< WRectF > &  rectangles  ) 

Draw a number of rectangles.

Draws and fills a list of rectangles using the current pen and brush.

See also:
drawRect(const WRectF&)

void Wt::WPainter::drawText ( const WRectF rectangle,
WFlags< AlignmentFlag flags,
const WString text 
)

Draw text.

Draw text using inside the rectangle, using the current font. The text is aligned inside the rectangle following alignment indications given in flags. The text is drawn using the current transformation, pen color (pen()) and font settings (font()).

Flags is the logical OR of a horizontal and vertical alignment. Horizontal alignment may be one of AlignLeft, AlignCenter, or AlignRight. Vertical alignment is one of AlignTop, AlignMiddle or AlignBottom.

Note: HtmlCanvas will always render the text horizontally (unaffected by rotation), and unaffected by the scaling component of the transformation matrix. Also, text is overlayed on top of painted shapes, and is not covered by shapes that are painted after the text. Use the SVG and VML renderers (WPaintedWidget::inlineSvgVml) for the most accurate font rendering.

void Wt::WPainter::drawText ( double  x,
double  y,
double  width,
double  height,
WFlags< AlignmentFlag flags,
const WString text 
)

Draw text.

This is an overloaded method for convenience.

See also:
drawText(const WRectF&, int, const WString&)

void Wt::WPainter::fillPath ( const WPainterPath path,
const WBrush brush 
)

Fill a (complex) path.

Like drawPath(const WPainterPath&), but does not stroke the path, and fills the path with the given brush.

See also:
drawPath(const WPainterPath&), strokePath(const WPainterPath&)

void Wt::WPainter::fillRect ( const WRectF rectangle,
const WBrush brush 
)

Fill a rectangle.

Like drawRect(const WRectF&), but does not stroke the rect, and fills the rect with the given brush.

See also:
drawRect(const WPainterPath&)

void Wt::WPainter::fillRect ( double  x,
double  y,
double  width,
double  height,
const WBrush brush 
)

Fill a rectangle.

This is an overloaded method for convenience.

See also:
fillRect(const WRectF&, const WBrush&)

void Wt::WPainter::strokePath ( const WPainterPath path,
const WPen pen 
)

Stroke a path.

Like drawPath(const WPainterPath&), but does not fill the path, and strokes the path with the given pen.

See also:
drawPath(const WRectF&), fillPath(const WRectF&, const WBrush&)

void Wt::WPainter::setBrush ( const WBrush brush  ) 

Change the fill style.

Changes the fills style for subsequent draw operations.

See also:
brush(), setPen(const WPen&)

void Wt::WPainter::setFont ( const WFont font  ) 

Change the font.

Changes the font for subsequent text rendering. Note that only font sizes that are defined as an explicit size (see WFont::FixedSize) will render correctly in all devices (SVG, VML, and HtmlCanvas).

See also:
font(), drawText()

void Wt::WPainter::setPen ( const WPen pen  ) 

Change the pen.

Changes the pen used for stroking subsequent draw operations.

See also:
pen(), setBrush(const WBrush&)

const WBrush& Wt::WPainter::brush (  )  const [inline]

Returns the current brush.

Returns the brush style that is currently used for filling.

See also:
setBrush(const WBrush&)

const WFont& Wt::WPainter::font (  )  const [inline]

Returns the current font.

Returns the font that is currently used for rendering text. The default font is a 10pt sans serif font.

See also:
setFont(const WFont&)

const WPen& Wt::WPainter::pen (  )  const [inline]

Returns the current pen.

Returns the pen that is currently used for stroking.

See also:
setPen(const WPen&)

void Wt::WPainter::setClipping ( bool  enable  ) 

Enable or disable clipping.

Enables are disables clipping for subsequent operations using the current clip path set using setClipPath().

Note: Clipping is not supported for the VML renderer.

See also:
hasClipping(), setClipPath(const WPainterPath&)

bool Wt::WPainter::hasClipping (  )  const [inline]

Return whether clipping is enabled.

Note: Clipping is not supported for the VML renderer.

See also:
setClipping(bool), setClipPath(const WPainterPath&)

void Wt::WPainter::setClipPath ( const WPainterPath clipPath  ) 

Set the clip path.

Sets the path that is used for clipping subsequent drawing operations. The clip path is only used when clipping is enabled using setClipping(bool). The path is specified in local coordinates.

Note: Only clipping with a rectangle is supported for the VML renderer (see WPainterPath::addRect()). The rectangle must, after applying the combined transformation system, be aligned with the window.

See also:
clipPath(), setClipping(bool)

WPainterPath Wt::WPainter::clipPath (  )  const [inline]

Get the clip path.

The clip path is returned as it was defined: in the local coordinates at time of definition.

See also:
setClipPath(const WPainterPath&)

void Wt::WPainter::resetTransform (  ) 

Reset the current transformation.

Resets the current transformation to the identity transformation matrix, so that the logical coordinate system coincides with the device coordinate system.

void Wt::WPainter::rotate ( double  angle  ) 

Rotate the logical coordinate system.

Rotates the logical coordinate system around its origin. The angle is specified in degrees, and positive values are clock-wise.

See also:
scale(double, double), translate(double, double), resetTransform()

void Wt::WPainter::scale ( double  sx,
double  sy 
)

Scale the logical coordinate system.

Scales the logical coordinate system around its origin, by a factor in the X and Y directions.

See also:
rotate(double), translate(double, double), resetTransform()

void Wt::WPainter::translate ( const WPointF offset  ) 

Translate the origin of the logical coordinate system.

Translates the origin of the logical coordinate system to a new location relative to the current logical coordinate system.

See also:
translate(double, double), rotate(double), scale(double, double), resetTransform()

void Wt::WPainter::translate ( double  dx,
double  dy 
)

Translate the origin of the logical coordinate system.

Translates the origin of the logical coordinate system to a new location relative to the logical coordinate system.

See also:
translate(const WPointF& offset), rotate(double), scale(double, double), resetTransform()

void Wt::WPainter::setWorldTransform ( const WTransform matrix,
bool  combine = false 
)

Set a transformation for the logical coordinate system.

Sets a new transformation which transforms logical coordinates to device coordinates. When combine is true, the transformation is combined with the current world transformation matrix.

See also:
worldTransform()

rotate(double), scale(double, double), translate(double, double)

resetTransform()

const WTransform& Wt::WPainter::worldTransform (  )  const [inline]

Get the current world transformation matrix.

See also:
setWorldTransform()

void Wt::WPainter::save (  ) 

Save the current state.

A copy of the current state is saved on a stack. This state will may later be restored by popping this state from the stack using restore().

The state that is saved is the current pen, brush, font, transformation and clipping settings (see setClipping() and setClipPath()).

See also:
restore()

void Wt::WPainter::restore (  ) 

Get the last save state.

Pops the last saved state from the state stack.

See also:
save()

void Wt::WPainter::setViewPort ( const WRectF viewPort  ) 

Set the viewport.

Selects the part of the device that will correspond to the logical coordinate system.

By default, the viewport spans the entire device: it is the rectangle (0, 0) to (device->width(), device->height()). The window defines how the viewport is mapped to logical coordinates.

See also:
viewPort(), setWindow(const WRectF&)

void Wt::WPainter::setViewPort ( double  x,
double  y,
double  width,
double  height 
)

Set the viewport.

This is an overloaded method for convenience.

See also:
setViewPort(const WRectF&)

WRectF Wt::WPainter::viewPort (  )  const [inline]

Returns the viewport.

See also:
setViewPort(const WRectF&)

void Wt::WPainter::setWindow ( const WRectF window  ) 

Set the window.

Defines the viewport rectangle in logical coordinates, and thus how logical coordinates map onto the viewPort.

By default, is (0, 0) to (device->width(), device->height()). Thus, the default window and viewport leave logical coordinates identical to device coordinates.

See also:
window(), setViewPort(const WRectF&)

void Wt::WPainter::setWindow ( double  x,
double  y,
double  width,
double  height 
)

Set the window.

This is an overloaded method for convenience.

See also:
setWindow(const WRectF&)

WRectF Wt::WPainter::window (  )  const [inline]

Returns the current window.

See also:
setViewPort(const WRectF&)

WTransform Wt::WPainter::combinedTransform (  )  const

Returns the combined transformation matrix.

Returns the transformation matrix that maps coordinates to device coordinates. It is the combination of the current world transformation (which defines the transformation within the logical coordinate system) and the window/viewport transformation (which transforms logical coordinates to device coordinates).

See also:
setWorldTransform(), setViewPort(), setWindow()


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