Inherits from | |
Conforms to | |
Framework | /System/Library/Frameworks/AppKit.framework |
Availability | Available in Mac OS X v10.3 and later. |
Companion guide | |
Declared in | NSShadow.h |
Related sample code |
An NSShadow
object encapsulates the attributes used to create a drop shadow during drawing operations.
Shadows are always drawn in the default user coordinate space, regardless of any transformations applied to that space. This means that rotations, translations and and other transformations of the current transformation matrix (the CTM) do not affect the resulting shadow. Another way to think about this is that changes to the CTM do not move or change the apparent position of the shadow’s light source.
There are two positional parameters for a shadow: an x-offset and a y-offset. These values are expressed using a single NSSize
data type and using the units of the default user coordinate space. Positive values for these offsets extend up and to the right.
In addition to its positional parameters, a shadow also contains a blur radius, which specifies how much a drawn object's image mask is blurred before it is composited onto the destination. A value of 0 means there is no blur. Larger values give correspondingly larger amounts of blurring.
An NSShadow
object may be used in one of two ways. First, it may be set, like a color or a font, in which case its attributes are applied to all content drawn thereafter—or at least until another shadow is applied or a previous graphics state is restored. Second, it may be used as the value for the NSShadowAttributeName
text attribute, in which case it is applied to the glyphs corresponding to the characters bearing this attribute.
– setShadowOffset:
– shadowOffset
– setShadowBlurRadius:
– shadowBlurRadius
– setShadowColor:
– shadowColor
Returns an NSShadow
object initialized with default values.
- (id)init
An NSShadow
object initialized with 0
as its offset, 0
as its blur radius, and the default color as its color. The returned object may be different from the original receiver.
NSShadow.h
Sets the shadow of subsequent drawing operations to the shadow represented by the receiver.
- (void)set
The shadow attributes of the receiver are used until another shadow is set or until the graphics state is restored.
NSShadow.h
Sets the blur radius of the receiver.
- (void)setShadowBlurRadius:(CGFloat)val
The blur radius, as measured in the default user coordinate space. A value of 0
indicates no blur, while larger values produce correspondingly larger blurring. This value must not be negative.
NSShadow.h
Sets the shadow color for the receiver.
- (void)setShadowColor:(NSColor *)color
The shadow color, which must be convertible to an RGBA color. Specify nil
if you do not want the shadow to be drawn. Your color may contain alpha information.
NSShadow.h
Sets the offset values for the receiver.
- (void)setShadowOffset:(NSSize)offset
The horizontal and vertical offset values, specified using the width
and height
fields of the NSSize
data type. These offsets are measured using the default user coordinate space and are not affected by custom transformations. This means that positive values always extend up and to the right from the user's perspective.
NSShadow.h
Returns the blur radius of the receiver.
- (CGFloat)shadowBlurRadius
The blur radius, as measured in the default user coordinate space. A value of 0
indicates no blur, while larger values produce correspondingly larger blurring. The default value is 0
.
NSShadow.h
Returns the color for the receiver.
- (NSColor *)shadowColor
The current shadow color. A nil
shadow color indicates the shadow is not to be drawn. The default shadow color is black with an alpha of 1/3.
NSShadow.h
Returns the offset values for the receiver.
- (NSSize)shadowOffset
The horizontal and vertical offset values, specified using the width
and height
fields of the NSSize
data type. These offsets are measured using the default user coordinate space and are not affected by custom transformations. This means that positive values always extend up and to the right from the user's perspective.
NSShadow.h
© 2009 Apple Inc. All Rights Reserved. (Last updated: 2009-02-04)