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The Power in your Hands |
Canvas Class Referenceabstract
#include <Pt/Gfx/Canvas.h>
Backend canvas for drawing commands. More...
Public Member Functions | |
| virtual | ~Canvas () |
| Destroys the canvas. | |
| const PointF & | origin () const |
| Returns the logical origin of the current region. | |
| const RectF & | region () const |
| Returns the current paint region. | |
| void | setRegion (const RectF &r) |
| Sets the paint region. | |
| const Scaling & | scaling () const |
| Returns the logical-to-physical scaling. | |
| void | setScaling (const Scaling &scaling) |
| Sets the logical-to-physical scaling. | |
| const Gfx::ImageFormat & | format () const |
| Returns the pixel format of the target. | |
| const Gfx::Transform & | transform () const |
| Returns the current transform. | |
| void | setTransform (const Gfx::Transform &tx) |
| Sets the current transform. | |
| void | resetTransform () |
| Resets the transform to the identity matrix. | |
| void | beginPaint (const Gfx::Paint &paint) |
| Begins painting with the given paint state. | |
| void | finishPaint () |
| Ends the current painting operation. | |
| bool | isActive () const |
| Returns true if painting is currently active. | |
| void | setCompositionMode (const Gfx::CompositionMode &mode) |
| Sets the current composition mode. | |
| void | setPen (const Pen &pen) |
| Sets the current pen. | |
| void | setBrush (const Brush &brush) |
| Sets the current brush. | |
| void | setFont (const Gfx::Font &font) |
| Sets the current font. | |
| void | setClip (const RectF &clip) |
| Sets the clip rectangle. | |
| void | resetClip () |
| Clears the clip rectangle. | |
| void | drawLine (const PointF &from, const PointF &to) |
| Draws a line between two points. | |
| void | drawPolyline (const Gfx::PointF *ps, const size_t n) |
| Draws a connected sequence of line segments. | |
| void | fillPolygon (const Gfx::PointF *ps, const size_t n) |
| Fills a polygon. | |
| void | drawRect (const Gfx::RectF &rectangle) |
| Draws the outline of a rectangle. | |
| void | fillRect (const Gfx::RectF &rectangle) |
| Fills a rectangle. | |
| void | drawEllipse (const Gfx::PointF &topLeft, const Gfx::SizeF &size) |
| Draws the outline of an ellipse. | |
| void | fillEllipse (const Gfx::PointF &topLeft, const Gfx::SizeF &size) |
| Fills an ellipse. | |
| void | setPath (const Path &path) |
| Sets the current path. | |
| void | drawPath () |
| Draws the current path. | |
| void | fillPath () |
| Fills the current path. | |
| void | drawPath (const Path &path) |
| Draws the given path. | |
| void | fillPath (const Path &path) |
| Fills the given path. | |
| const FontMetrics & | fontMetrics () const |
| Returns metrics for the current font. | |
| TextMetrics | textMetrics (const Pt::String &text) const |
| Measures a line of text. | |
| void | drawText (const PointF &to, const Pt::String &text, const Transform *tform=0) |
| Draws a line of text. | |
| void | drawImage (const Gfx::PointF &to, const Gfx::Image &image, const Gfx::RectF *rect=0) |
| Draws an image. | |
| void | drawBitmap (const Gfx::PointF &to, const Gfx::Bitmap &bitmap, const Gfx::RectF *rect=0) |
| Draws a bitmap. | |
Detailed Description
Canvas is implemented by paint backends and executes the drawing commands emitted by PainterBase. It manages the active drawing state for a target, exposes target geometry and scaling, and translates high-level operations such as path, text and bitmap drawing into backend-specific primitives.