On Feb 15, 2012, at 7:32 AM, koko wrote:
> I want to capture a rect centered on the point where the user clicked so I
> can get a best fit for the color.
Here's a thought:
[NSEvent addGlobalMonitorForEventsMatchingMask:NSMouseMovedMask
handler:^(NSEvent * event){
if (event.type == NSMouseMoved) {
NSPoint point = [NSEvent mouseLocation];
CGRect mainDisplayBounds =
CGDisplayBounds(CGMainDisplayID());
CGPoint cgDisplayPoint = CGPointMake(point.x,
mainDisplayBounds.size.height - point.y);
CGRect rect = CGRectMake(cgDisplayPoint.x - 10,
cgDisplayPoint.y - 10, 20, 20);
CGImageRef imageRef = CGWindowListCreateImage(rect,
kCGWindowListOptionOnScreenOnly, kCGNullWindowID, kCGWindowImageDefault);
magnifierView.image = [[[NSImage alloc]
initWithCGImage:imageRef size:rect.size] autorelease];
CGImageRelease(imageRef);
} else if (event.type == NSLeftMouseDown) {
if (this is supposed to be a color selection click) {
grab the pixel color from the image
}
}
}];
--
Seth Willits
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