Assumes "Automatic Reference Counting" (ARC) is enabled.
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@interface Shape : NSObject
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@property (assign) NSPoint center;
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@property (strong) NSColor* color;
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@end
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@interface Rectangle : Shape
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@property (assign) NSSize size;
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@end
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@interface Circle : Shape
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@property (assign) CGFloat radius;
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@end
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@implementation Shape
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@synthesize centre;
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@synthesize color;
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- (void)draw {
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[color set];
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}
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@end
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@implementation Rectangle
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@synthesize size;
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- (void)draw {
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[super draw];
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[NSBezierPath fillRect:NSMakeRect(self.centre.x - size.width / 2, self.centre.y - size.height / 2, size.width, size.height)];
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}
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@end
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@implementation Circle
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@synthesize radius;
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- (void)draw {
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[super draw];
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[[NSBezierPath bezierPathWithOvalInRect:NSMakeRect(self.centre.x - radius, self.centre.y - radius, radius2, radius2)] fill];
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}
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@end
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- (void)drawRect:(NSRect)rect {
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rect = [self bounds];
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[[NSColor cyanColor] set];
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[NSBezierPath fillRect:rect];
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Rectangle* rectangle = [[Rectangle alloc] init];
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rectangle.size = NSMakeSize(300, 200);
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rectangle.centre = NSMakePoint(NSMidX(rect), NSMidY(rect));
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rectangle.color = [NSColor whiteColor];
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[rectangle draw];
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Circle* circle = [[Circle alloc] init];
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circle.radius = 60;
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circle.centre = rectangle.centre;
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circle.color = [NSColor redColor];
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[circle draw];
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}
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