setStrokeColor(gray:alpha:)

Declaration

func setStrokeColor(gray: CGFloat, alpha: CGFloat)

Parameters

• 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 Fill, Stroke, and Shadow Colors

• setFillColor(_:)
• setFillColor(_:)
• setFillColor(cyan:magenta:yellow:black:alpha:)
• setFillColor(gray:alpha:)
• setFillColor(red:green:blue:alpha:)
• setFillColorSpace(_:)
• setShadow(offset:blur:)
• setShadow(offset:blur:color:)
• setStrokeColor(_:)
• setStrokeColor(_:)
• setStrokeColor(cyan:magenta:yellow:black:alpha:)
• setStrokeColor(red:green:blue:alpha:)
• setStrokeColorSpace(_:)
• setStrokePattern(_:colorComponents:)
• setAlpha(_:)