Paint (gb.qt4)

This class is used for doing anti-aliased painting on various targets.

This class is static.

Constants

ExtendPad	Pixels outside of the brush copy the closest pixel.
ExtendReflect	The brush is tiled by reflecting at the edges.
ExtendRepeat	The pattern is tiled by repeating.
FillRuleEvenOdd	Constant used to select how paths are filled.
FillRuleWinding	Constant used to select how paths are filled.
LineCapButt	Specifies to render the endpoints of the path when stroking by starting(stopping) the line exactly at the start(end) point.
LineCapRound	Specifies to render the endpoints of the path when stroking by using a round ending, the center of the circle being the end point.
LineCapSquare	Specifies to render the endpoints of the path when stroking by using squared ending, the center of the square being the end point.
LineJoinBevel	Specifies to render the junction of two lines by using a cut-off join, the join being cut off at half the line width from the joint point.
LineJoinMiter	Specifies to render the junction of two lines by using a sharp (angled) corner.
LineJoinRound	Specifies to render the junction of two lines by using a rounded join, the center of the circle being the joint point.
OperatorATop	Compositing operator that draws the source on top of destination content and only there.
OperatorAdd	Compositing operator that accumulates the source and destination layers.
OperatorClear	Compositing operator that clears the destination layer (bounded).
OperatorColorBurn	Composition operator that darkens the destination color to reflect the source color.
OperatorColorDodge	Compositing operator that brightens the destination color to reflect the source color.
OperatorDarken	Compositing operator that replaces the destination with the source if it is darker, otherwise keeps the source.
OperatorDest	Compositing operator that ignores the source.
OperatorDestATop	Compositing operator that leaves the destination on top of source content and only there (unbounded).
OperatorDestIn	Compositing operator that leaves the destination only where there was source content (unbounded).
OperatorDestOut	Compositing operator that leaves the destination only where there was no source content.
OperatorDestOver	Compositing operator that draws the destination on top of the source.
OperatorDifference	Compositing operator that takes the difference of the source and destination color.
OperatorExclusion	Compositing operator that produces an effect similar to difference, but with lower contrast.
OperatorHardLight	Compositing operator that multiplies or screens, dependent on source color.
OperatorIn	Compositing operator that draws the source where there was destination content (unbounded).
OperatorLighten	Compositing operator that replaces the destination with the source if it is lighter, otherwise keeps the source.
OperatorMultiply	Compositing operator that multiply the source and destination layers. This causes the result to be at least as dark as the darker inputs.
OperatorOut	Compositing operator that draws the source where there was no destination content (unbounded).
OperatorOver	Compositing operator that draws the source layer on top of the destination layer (bounded).
OperatorOverlay	Compositing operator that multiplies or screens, depending on the lightness of the destination color.
OperatorSaturate	The output is the source color multiplied by the destination. Multiplying a color with white leaves the color unchanged, while multiplying a color with black produces black.
OperatorScreen	Compositing operator that complement and multiply the source and the destination. This causes the result to be at least as light as the lighter inputs.
OperatorSoftLight	Compositing operator that darkens or lightens, dependent on source color.
OperatorSource	Compositing operator that replaces the destination layer (bounded).
OperatorXor	Compositing operator that shows source and destination where there is only one of them.

Static properties

AntiAlias	Return or set if the painting will be anti-aliased.
Background	Return or set the background color.
Brush	Returns or sets the brush used for drawing.
BrushOrigin	Return or set the brush origin.
ClipExtents	Computes a bounding box in user coordinates covering the area inside the current clip.
ClipRect	Return or set the clipping region as a rectangle.
Dash	Returns or sets the dash pattern to be used by Paint.Stroke.
DashOffset	Returns or sets the offset used for drawing dashes.
Device	Returns the device you are drawing on with the Paint class.
FillRule	Returns or sets the current fill rule within the current drawing.
Font	Returns or sets the font used for painting text.
FontScale	Return or set a scale that is transparently applied to the size of the painting font.
H	Returns the height of the device being painted.
Height	Returns the height of the device being painted.
LineCap	Returns or sets the current line cap style within the current paiting.
LineDash	A synonymous of Dash.
LineDashOffset	A synonymous of DashOffset.
LineJoin	Returns or sets the current line join style within the current painting.
LineWidth	Returns or sets the current line width. The line width value specifies the diameter of a pen that is circular in user space, though device-space pen may be an ellipse in general due to scaling/shear/rotation of the current transformation matrix (CTM).
Matrix	Returns or sets the current transformation matrix.
MiterLimit	Returns or sets the current miter limit.
Operator	Returns or sets the compositing operator to be used for all drawing operations. See each one of the constants below for details on the semantics of each available compositing operator.
PathExtents	Computes a bounding box in user-space coordinates covering the points on the current path.
PathOutline	Return a array of polygons corresponding to the current drawing path.
ResolutionX	Returns the horizontal resolution of the device being painted.
ResolutionY	Returns the vertical resolution of the device being painted.
TextHeight	Return the height of one line of text.
W	Returns the width of the device being painted.
Width	Returns the width of the device being painted.
X	Returns the X coordinate of the current point.
Y	Returns the Y coordinate of the current point.

Static methods

Arc	Adds a circular arc of the given Radius to the current path. The arc is centered at (XC, YC), begins at Angle and proceeds counter-clockwise during Length radians.
Arrow	Add an arrow to the current path.
Begin	Starts painting on the specified device.
Check	Add a check mark to the current path.
Circle	Paint a circle.
Clip	Establishes a new clip region by intersecting the current clip region with the current path as it would be filled by Paint.Fill and according to the current fill rule (see Paint.FillRule).
ClosePath	Adds a line segment to the path from the current point to the beginning of the current sub-path, (the most recent point passed to Paint.MoveTo), and closes this sub-path. After this call the current point will be at the joined endpoint of the sub-path.
Color	Creates a new brush corresponding to an opaque or translucent color.
CurveTo	Adds a cubic Bézier spline to the path from the current point to position (X3, Y3) in user-space coordinates, using (X1, Y1) and (X2, Y2) as the control points. After this call the current point will be (X3, Y3).
DrawImage	Draw an Image, or part of it.
DrawPicture	Draw a Picture, or part of it.
DrawRect	Draw a rectangle frame
DrawRichText	Draws a piece of rich text.
DrawRichTextShadow	Draw the shadow of a rich text.
DrawText	Draws the specified text.
DrawTextShadow	Draw the shadow of a text.
Ellipse	Adds an elliptic arc to the current path. The ellipse is defined by its (X, Y, Width, Height) bounding-box, begins at Angle and proceeds counter-clockwise during Length radians.
End	Ends a painting.
Fill	A drawing operator that fills the current path according to the current fill rule, (each sub-path is implicitly closed before being filled).
FillRect	Fill a rectangle with a specific color.
Image	Creates a new brush from an image.
LineTo	Adds a line to the path from the current point to position (X, Y) in user-space coordinates. After this call the current point will be (X, Y).
LinearGradient	Creates a new linear gradient brush along the line defined by (X0, Y0) and (X1, Y1), and using color stops defined by the Colors and Positions arguments.
MoveTo	Begin a new sub-path. After this call the current point will be (X, Y).
NewPath	Clears the current path. After this call there will be no path and no current point.
PathContains	Tests whether the given point is inside the area described by the current path. Device dimensions and clipping are not taken into account.
Polygon	Add a closed sub-path polygon to the current path.
RadialGradient	Creates a new radial gradient paint brush that interpolates colors between a focal point ( FX , FY ) and end points on a circle defined by ( CX0 , CY0 , Radius0 ), and using color stops defined by the Colors and Positions arguments.
Rectangle	Adds a closed sub-path rectangle of the given size to the current path at position (X, Y) in user-space coordinates.
RelCurveTo	Relative-coordinate version of CurveTo.
RelLineTo	Relative-coordinate version of LineTo.
RelMoveTo	Begin a new sub-path. After this call the current point will be offset by (X, Y).
Reset	Resets the transformation matrix to the identity.
ResetClip	Reset the current clip region to its original, unrestricted state. That is, set the clip region to an infinitely large shape containing the target surface. Equivalently, if infinity is too hard to grasp, one can imagine the clip region being reset to the exact bounds of the target surface.
Restore	Restores the drawing state to the state saved by a preceding call to Save and removes that state from the stack of saved states.
RichText	Adds the specified rich text to the current path, using the current font defined by the Font property.
RichTextExtents	Gets the extents for a string of rich text.
RichTextSize	Return the bounding box needed by a string of rich text.
Rotate	Modifies the current transformation matrix (CTM) by rotating the user-space axes by angle radians. The rotation of the axes takes places after any existing transformation of user space. The rotation direction for positive angles is from the positive X axis toward the positive Y axis.
Save	Makes a copy of the current drawing state and saves it on an internal stack of saved states.
Scale	Modifies the current transformation matrix (CTM) by scaling the X and Y user-space axes by sx and sy respectively. The scaling of the axes takes place after any existing transformation of user space.
StretchImage	Stretch and draw an image or part of an image so that it fits a specified rectangle.
Stroke	A drawing operator that strokes the current path according to the current line width, line join, line cap, and dash settings.
Text	Adds the specified text to the current path, using the current font defined by the Font property.
TextExtents	Gets the extents for a string of text.
TextSize	Return the bounding box needed by a string of text.
Translate	Modifies the current transformation matrix (CTM) by translating the user-space origin by (TX, TY).
TrimRichText	Return a trimmed version of the specified rich text so that it fits the requested rectangle.
TrimText	Return a trimmed version of the specified text so that it fits the requested rectangle.
ZoomImage	Draw a quick zoomed version of an image or a part of it.

Paint can draw on the following targets:

Before starting drawing anything, you must call the Paint.Begin method by passing it the object you want to draw.

Then you can draw what you want in three steps:

Define a brush by calling Paint.Color, Paint.Image, Paint.LinearGradient or Paint.RadialGradient, and assign the result to the Paint.Brush property.
Define the drawing path by using the Paint.MoveTo, Paint.LineTo, Paint.Rectangle, Paint.Arc... methods.
Paint the previous path with the selected brush by calling Paint.Stroke or Paint.Fill.

When your drawing is finished, you must call the Paint.End method.

The interface of this class is very close to the Cairo drawing model.