Function

CGContextSetGrayStrokeColor

Sets the current stroke color to a value in the DeviceGray color space.

Declaration

void CGContextSetGrayStrokeColor(CGContextRef c, CGFloat gray, CGFloat alpha);

Parameters

c

The graphics context for which to set the current stroke color.

gray

A value that specifies the desired gray level. The DeviceGray color space permits the specification of a value ranging from 0.0 (absolute black) to 1.0 (absolute white). Values outside this range are clamped to 0.0 or 1.0.

alpha

A value that specifies the opacity level. Values can range from 0.0 (transparent) to 1.0 (opaque). Values outside this range are clipped to 0.0 or 1.0.

Discussion

When you call this function, two things happen:

  • Core Graphics sets the current stroke color space to DeviceGray. The DeviceGray color space is a single-dimension space in which color values are specified solely by the intensity of a gray value (from absolute black to absolute white).

  • Core Graphics sets the current stroke color to the value you specify in the gray and alpha parameters.

See Also

Setting Color, Color Space, and Shadow Values

CGContextSetAlpha

Sets the opacity level for objects drawn in a graphics context.

CGContextSetCMYKFillColor

Sets the current fill color to a value in the DeviceCMYK color space.

CGContextSetFillColor

Sets the current fill color.

CGContextSetCMYKStrokeColor

Sets the current stroke color to a value in the DeviceCMYK color space.

CGContextSetFillColorSpace

Sets the fill color space in a graphics context.

CGContextSetFillColorWithColor

Sets the current fill color in a graphics context, using a CGColor.

CGContextSetGrayFillColor

Sets the current fill color to a value in the DeviceGray color space.

CGContextSetRGBFillColor

Sets the current fill color to a value in the DeviceRGB color space.

CGContextSetRGBStrokeColor

Sets the current stroke color to a value in the DeviceRGB color space.

CGContextSetShadow

Enables shadowing in a graphics context.

CGContextSetShadowWithColor

Enables shadowing with color a graphics context.

CGContextSetStrokeColor

Sets the current stroke color.

CGContextSetStrokeColorSpace

Sets the stroke color space in a graphics context.

CGContextSetStrokeColorWithColor

Sets the current stroke color in a context, using a CGColor.