Hi,
I'm trying to draw an NSImage (a PNG) in a CALayer. The goal is to
create a method that allows me to pass an NSImage as an argument to
create a layer-hosting view. I have:
-(id)drawButton: (NSView *)button withImage:(NSImage *)anImage {
...
// image layer
imageLayer=[CALayer layer];
[imageLayer drawLayer:imageLayer inContext:ctx];
imageLayer.masksToBounds=YES;
[imageLayer addConstraint:[CAConstraint
constraintWithAttribute:kCAConstraintMaxY
relativeTo:@"superlayer"
attribute:kCAConstraintMaxY
offset:-(height/2)]];
[imageLayer addConstraint:[CAConstraint
constraintWithAttribute:kCAConstraintMidX
relativeTo:@"superlayer"
attribute:kCAConstraintMidX]];
[titleLayer addSublayer:imageLayer];
[titleLayer layoutIfNeeded];
...
And I found this snippet in the Core Animation Cookbook:
- (void)drawLayer:(CALayer *)layer inContext:(CGContextRef)ctx
{
NSGraphicsContext *nsGraphicsContext;
nsGraphicsContext = [NSGraphicsContext
graphicsContextWithGraphicsPort:ctx
flipped:NO];
[NSGraphicsContext saveGraphicsState];
[NSGraphicsContext setCurrentContext:nsGraphicsContext];
// ...Draw content using NS APIs...
NSRect aRect=NSMakeRect(10.0,10.0,30.0,30.0);
NSBezierPath *thePath=[NSBezierPath bezierPathWithRect:aRect];
[[NSColor redColor] set];
[thePath fill];
[NSGraphicsContext restoreGraphicsState];
}
But I don't know how to get the current CGContextRef for the second
parameter.
Thanks in advance.
Brad
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