Sets the source pattern within the context to an opaque color. This opaque color will then be used for any subsequent drawing operation until a new source pattern is set.

The color components are floating point numbers in the range 0 to 1. If the values passed in are outside that range, they will be clamped.

Sets the source pattern within the context to a translucent color. This color will then be used for any subsequent drawing operation until a new source pattern is set.

The color and alpha components are floating point numbers in the range 0 to 1. If the values passed in are outside that range, they will be clamped.

Sets the source pattern within the context to source. This pattern will then be used for any subsequent drawing operation until a new source pattern is set.

Note: The pattern's transformation matrix will be locked to the user space in effect at the time of setSource. This means that further modifications of the current transformation matrix will not affect the source pattern. See setMatrix.

This is a convenience function for creating a pattern from surface and setting it as the source in the context with setSource.

The x and y parameters give the user-space coordinate at which the surface origin should appear. (The surface origin is its upper-left corner before any transformation has been applied.) The x and y patterns are negated and then set as translation values in the pattern matrix.

Other than the initial translation pattern matrix, as described above, all other pattern attributes, (such as its extend mode), are set to the default values as in patternCreateForSurface. The resulting pattern can be queried with getSource so that these attributes can be modified if desired, (eg. to create a repeating pattern with patternSetExtent.

Set the antialiasing mode of the rasterizer used for drawing shapes. This value is a hint, and a particular backend may or may not support a particular value. At the current time, no backend supports AntialiasSubpixel when drawing shapes.

Note that this option does not affect text rendering, instead see fontOptionsSetAntilias.

Sets the dash pattern to be used by stroke. A dash pattern is specified by dashes, a list of positive values. Each value provides the user-space length of altenate on and off portions of the stroke. The offset specifies an offset into the pattern at which the stroke begins.

If dashes is [] then dashing is disabled.

Sets the current line cap style within the cairo context. See LineCap for details about how the available line cap styles are drawn.

As with the other stroke parameters, the current line cap style is examined by stroke, strokeExtents, and strokeToPath, but does not have any effect during path construction.

Sets the current line join style within the cairo context. See LineJoin for details about how the available line join styles are drawn.

As with the other stroke parameters, the current line join style is examined by stroke, strokeExtents, and strokeToPath, but does not have any effect during path construction.

Sets the current line width within the cairo context. The line width specifies the diameter of a pen that is circular in user-space.

As with the other stroke parameters, the current line cap style is examined by stroke, strokeExtents, and strokeToPath, but does not have any effect during path construction.

Adds a circular arc of the given radius to the current path. The arc is centered at (xc, yc), begins at angle1 and proceeds in the direction of increasing angles to end at angle2. If angle2 is less than angle1 it will be progressively increased by 2*pi until it is greater than angle1.

If there is a current point, an initial line segment will be added to the path to connect the current point to the beginning of the arc.

Angles are measured in radians. An angle of 0 is in the direction of the positive X axis (in user-space). An angle of pi radians (90 degrees) is in the direction of the positive Y axis (in user-space). Angles increase in the direction from the positive X axis toward the positive Y axis. So with the default transformation matrix, angles increase in a clockwise direction.

(To convert from degrees to radians, use degrees * (pi / 180).)

This function gives the arc in the direction of increasing angles; see arcNegative to get the arc in the direction of decreasing angles.

The arc is circular in user-space. To achieve an elliptical arc, you can scale the current transformation matrix by different amounts in the X and Y directions. For example, to draw an ellipse in the box given by x, y, width, height:

 save
 translate (x + width / 2) (y + height / 2)
 scale (1 / (height / 2.)) (1 / (width / 2))
 arc 0 0 1 0 (2 * pi)
 restore

Adds a circular arc of the given radius to the current path. The arc is centered at (xc, yc), begins at angle1 and proceeds in the direction of decreasing angles to end at angle2. If angle2 is greater than angle1 it will be progressively decreased by 2*pi until it is greater than angle1.

See arc for more details. This function differs only in the direction of the arc between the two angles.

Render text at the current path.

• See showText for why you should use Gtk functions.

Relative-coordinate version of curveTo. All offsets are relative to the current point. Adds a cubic Bezier spline to the path from the current point to a point offset from the current point by (dx3, dy3), using points offset by (dx1, dy1) and (dx2, dy2) as the control points. After this call the current point will be offset by (dx3, dy3).

Given a current point of (x, y), relCurveTo dx1 dy1 dx2 dy2 dx3 dy3 is logically equivalent to curveTo (x + dx1) (y + dy1) (x + dx2) (y + dy2) (x + dx3) (y + dy3).

Relative-coordinate version of lineTo. Adds a line to the path from the current point to a point that is offset from the current point by (dx, dy) in user space. After this call the current point will be offset by (dx, dy).

Given a current point of (x, y), relLineTo dx dy is logically equivalent to lineTo (x + dx) (y + dy).

If the current subpath is not empty, begin a new subpath. After this call the current point will offset by (x, y).

Given a current point of (x, y), relMoveTo dx dy is logically equivalent to moveTo (x + dx) (y + dy)

Creates a new Pattern corresponding to an opaque color. The color components are floating point numbers in the range 0 to 1. If the values passed in are outside that range, they will be clamped.

For example to create a solid red pattern:

 withRBGPattern 1 0 0 $ do
   ...
   ...

Creates a new Pattern corresponding to a translucent color. The color components are floating point numbers in the range 0 to 1. If the values passed in are outside that range, they will be clamped.

For example to create a solid red pattern at 50% transparency:

 withRBGPattern 1 0 0 0.5 $ do
   ...
   ...

Create a new linear gradient Pattern along the line defined by (x0, y0) and (x1, y1). Before using the gradient pattern, a number of color stops should be defined using patternAddColorStopRGB and patternAddColorStopRGBA.

• Note: The coordinates here are in pattern space. For a new pattern, pattern space is identical to user space, but the relationship between the spaces can be changed with patternSetMatrix.

Creates a new radial gradient Pattern between the two circles defined by (x0, y0, c0) and (x1, y1, c0). Before using the gradient pattern, a number of color stops should be defined using patternAddColorStopRGB or patternAddColorStopRGBA.

• Note: The coordinates here are in pattern space. For a new pattern, pattern space is identical to user space, but the relationship between the spaces can be changed with patternSetMatrix.

Adds an opaque color stop to a gradient pattern. The offset specifies the location along the gradient's control vector. For example, a linear gradient's control vector is from (x0,y0) to (x1,y1) while a radial gradient's control vector is from any point on the start circle to the corresponding point on the end circle.

The color is specified in the same way as in setSourceRGB.

Note: If the pattern is not a gradient pattern, (eg. a linear or radial pattern), then the pattern will be put into an error status with a status of StatusPatternTypeMismatch.

Adds a translucent color stop to a gradient pattern. The offset specifies the location along the gradient's control vector. For example, a linear gradient's control vector is from (x0,y0) to (x1,y1) while a radial gradient's control vector is from any point on the start circle to the corresponding point on the end circle.

The color is specified in the same way as in setSourceRGBA.

Note: If the pattern is not a gradient pattern, (eg. a linear or radial pattern), then the pattern will be put into an error status with a status of StatusPatternTypeMismatch.

Sets the pattern's transformation matrix to matrix. This matrix is a transformation from user space to pattern space.

When a pattern is fi