Function

CGContextClearRect

Paints a transparent rectangle.

Declaration

void CGContextClearRect(CGContextRef c, CGRect rect);

Parameters

c

The graphics context in which to paint the rectangle.

rect

The rectangle, in user space coordinates.

Discussion

If the provided context is a window or bitmap context, Core Graphics clears the rectangle. For other context types, Core Graphics fills the rectangle in a device-dependent manner. However, you should not use this function in contexts other than window or bitmap contexts.

See Also

Painting Paths

CGContextDrawPath

Draws the current path using the provided drawing mode.

CGContextEOFillPath

Paints the area within the current path, using the even-odd fill rule.

CGContextFillPath

Paints the area within the current path, using the nonzero winding number rule.

CGContextFillRect

Paints the area contained within the provided rectangle, using the fill color in the current graphics state.

CGContextFillRects

Paints the areas contained within the provided rectangles, using the fill color in the current graphics state.

CGContextFillEllipseInRect

Paints the area of the ellipse that fits inside the provided rectangle, using the fill color in the current graphics state.

CGContextStrokePath

Paints a line along the current path.

CGContextStrokeRect

Paints a rectangular path.

CGContextStrokeRectWithWidth

Paints a rectangular path, using the specified line width.

CGContextReplacePathWithStrokedPath

Replaces the path in the graphics context with the stroked version of the path.

CGContextStrokeEllipseInRect

Strokes an ellipse that fits inside the specified rectangle.

CGContextStrokeLineSegments

Strokes a sequence of line segments.

Beta Software

This documentation contains preliminary information about an API or technology in development. This information is subject to change, and software implemented according to this documentation should be tested with final operating system software.

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