Function

CGContextConvertRectToUserSpace

Returns a rectangle that is transformed from device space coordinate to user space coordinates.

Declaration

CGRect CGContextConvertRectToUserSpace(CGContextRef c, CGRect rect);

Parameters

c

A graphics context.

rect

The rectangle, in device space coordinates, to transform.

Return Value

The rectangle in user space coordinates.

Discussion

In general, affine transforms do not preserve rectangles. As a result, this function returns the smallest rectangle that contains the transformed corner points of the rectangle.

See Also

Converting Between Device Space and User Space

CGContextGetUserSpaceToDeviceSpaceTransform

Returns an affine transform that maps user space coordinates to device space coordinates.

CGContextConvertPointToDeviceSpace

Returns a point that is transformed from user space coordinates to device space coordinates.

CGContextConvertPointToUserSpace

Returns a point that is transformed from device space coordinates to user space coordinates.

CGContextConvertSizeToDeviceSpace

Returns a size that is transformed from user space coordinates to device space coordinates.

CGContextConvertSizeToUserSpace

Returns a size that is transformed from device space coordinates to user space coordinates.

CGContextConvertRectToDeviceSpace

Returns a rectangle that is transformed from user space coordinate to device space coordinates.