TCanvas

Abstract base class for a 2D surface that allows drawing upon

Inheritance

Level	Ancestor	Description
1	TObject	Ultimate ancestor in a class hierarchy
2	TCanvas

Source

Drawing.Canvas.pas (55)

Description

A canvas uses the painter's algorithm which means that later drawing operations are drawn over earlier operations. For every drawing operation the current Transformation and ClippingWindow are applied. Also, a new layer can be created using PushLayer which will receive all drawing operations until PopLayer is called at which point the layer is composited onto specified area of the canvas. The functions for transformation, clipping and layers come in pairs and should be balanced properly.

Fields

Scope	Visibility	Type	Name
Instance	protected	TSizedFont	FFont
Instance	protected	TStroke	FStroke
Instance	protected	TFill	FFill

Methods

Scope	Visibility	Result	Name
Instance	protected		SetFont(Value: TSizedFont)
Instance	protected		SetStroke(Value: TStroke)
Instance	protected		SetFill(Value: TFill)
Instance	protected	T2dCompoundAffineTransformation	GetTransformation()
Instance	protected	TClippingWindow	GetClippingWindow()
Instance	protected		FontChanged()
Instance	protected		StrokeChanged()
Instance	protected		FillChanged()
Instance	public		Destroy()
Instance	public		FillRectangle(Rectangle: TInteger32Rectangle)
Instance	public		FillRectangle(Rectangle: T2dFloatingPoint64Rectangle)
Instance	public		DrawRectangle(Rectangle: TInteger32Rectangle)
Instance	public		DrawRectangle(Rectangle: T2dFloatingPoint64Rectangle)
Instance	public		DrawRoundedRectangle(Rectangle: T2dFloatingPoint64RoundedRectangle)
Instance	public		FillRoundedRectangle(Rectangle: T2dFloatingPoint64RoundedRectangle)
Instance	public		DrawImage(Position: T2dFloatingPoint64Point; Image: TRasterImage)
Instance	public		StrokeGeometry(Geometry: T2dGeometry)
Instance	public		FillGeometry(Geometry: T2dGeometry)
Instance	public		DrawLine(Point1: TInteger32Point; Point2: TInteger32Point)
Instance	public		DrawLine(Point1: T2dFloatingPoint64Point; Point2: T2dFloatingPoint64Point)
Instance	public		HorizontalLine(HorizontalRange: TInteger32Interval; Y: TInteger32)
Instance	public		VerticalLine(X: TInteger32; VerticalRange: TInteger32Interval)
Instance	public		HorizontalLine(HorizontalRange: TFloatingPoint64Interval; Y: TFloatingPoint64)
Instance	public		VerticalLine(X: TFloatingPoint64; VerticalRange: TFloatingPoint64Interval)
Instance	public		FillEllipse(Ellipse: T2dFloatingPoint64Ellipse)
Instance	public		TextOut(TopLeft: T2dFloatingPoint64Point; Text: TText)
Instance	public		FillText(BaseLineLeft: T2dFloatingPoint64Point; Text: TText)
Instance	public		FillTextLayout(TopLeft: T2dFloatingPoint64Point; Layout: TTextLayout)
Instance	public		OverlayRectangle(Rectangle: TInteger32Rectangle; Factor: TFloatingPoint64)
Instance	public		OverlayGradient(Rectangle: TInteger32Rectangle; Color: TRgbColor; Factors: TFloatingPoint64Interval; Dimension: T2dDimension)
Instance	public	TCanvas	PushLayer(Bounds: T2dFloatingPoint64Rectangle; Opacity: TFloatingPoint64)
Instance	public		PopLayer()
Instance	public	TCanvas	Create3dCanvas(Size: TInteger32Size; RotationX: TFloatingPoint64; RotationY: TFloatingPoint64)
Instance	public		Destroy3dCanvas(Canvas: TCanvas)