TargetView.m
/* |
File: TargetView.m |
Abstract: A simple NSImageView subclass that draws little green circles where the user clicks on top of the image. |
Version: 1.1 |
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*/ |
#import "TargetView.h" |
@implementation TargetView |
- (id)initWithFrame:(NSRect)frame { |
self = [super initWithFrame:frame]; |
if (self) { |
self.image = [NSImage imageNamed:@"bullseye"]; |
[self setAutoresizingMask: (NSViewMinYMargin | NSViewMinXMargin)]; |
} |
return self; |
} |
- (void)dealloc { |
[_path release]; |
[super dealloc]; |
} |
#pragma mark NSResponder |
- (void)mouseDown:(NSEvent *)event { |
// We use an NSBezierPath to store and draw the clicked points. We create it lazily on the first click in the view. |
if (!_path){ |
_path = [[NSBezierPath bezierPath] retain]; |
} |
// Convert the clicked point into the views coordinate space and add the green circle to the bezierPath. Any point within the bounds of the view is considered a hit. |
NSPoint cursorLocation = [event locationInWindow]; |
cursorLocation = [self convertPoint:cursorLocation fromView:nil]; |
// Test if the hit occured in the opaque part of the image. We create a 1x1 rectange at the click point and test for intersection with a non-transparent section of the image. |
NSRect cursorLocationRect = { cursorLocation, {1, 1} }; |
if ( [self.image hitTestRect:cursorLocationRect withImageDestinationRect:self.bounds |
context:nil hints:nil flipped:NO] == NO ) { |
// If the click missed then we ignore it here. |
[super mouseDown:event]; |
return; |
} |
static const CGFloat kHoleRadius = 6.0f; |
CGFloat kHoleDiameter = kHoleRadius * 2.0f; |
NSRect holeFrame = NSMakeRect(cursorLocation.x - kHoleRadius, cursorLocation.y - kHoleRadius, kHoleDiameter, kHoleDiameter); |
[_path appendBezierPath:[NSBezierPath bezierPathWithOvalInRect:holeFrame]]; |
[self setNeedsDisplayInRect:holeFrame]; |
} |
#pragma mark NSView |
- (void)drawRect:(NSRect)dirtyRect { |
// Let super handle drawing of the image. |
[super drawRect:dirtyRect]; |
// All we need to draw are the green circles where the user clicked. |
[[NSColor greenColor] set]; |
[_path fill]; |
} |
@end |
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