Re: Working out the four points of a sublayerTransform

• Subject: Re: Working out the four points of a sublayerTransform
• From: Neil Clayton <email@hidden>
• Date: Wed, 19 Mar 2008 15:14:30 +1300
• Comment: DomainKeys? See http://antispam.yahoo.com/domainkeys
• Delivered-to: email@hidden
• Delivered-to: email@hidden
• Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=private; d=cloudnine.net.nz; b=IghqdXBH+iLMQXntGQIYxBN2JI8D5i20hZr9Ga8PFXDuRJw7ptmAQhaLQqahdQIR;

John, Thanks for your help. I got it going (cheering in the background!)

@interface CGCorners : NSObject {
	CGPoint bottomLeft;
	CGPoint bottomRight;
	CGPoint topRight;
	CGPoint topLeft;
}
@end

@implementation CGCorners

struct A3DPoint {
	CGFloat x;
	CGFloat y;
	CGFloat z;
	CGFloat w;
};
typedef struct A3DPoint A3DPoint;

union CG3DPoint {
	struct A3DPoint tdp;
	struct CGPoint cgp;
};
typedef union CG3DPoint CG3DPoint;

CG3DPoint CGPointTo3DPoint(CGPoint aCGpoint) {
	CG3DPoint point = {0};
	point.tdp.z = 0;
	point.tdp.w = 1;	
	point.cgp = aCGpoint;
	return point;
}

- (id) initWithCGRect:(CGRect)frame {
	self = [super init];
	if (self != nil) {
		bottomLeft = frame.origin;
		
		bottomRight = frame.origin;
		bottomRight.x += frame.size.width;
		
		topRight = frame.origin;
		topRight.x += frame.size.width;
		topRight.y += frame.size.height;
		
		topLeft = frame.origin;
		topLeft.y += frame.size.height;
	}
	return self;
}

- (CATransform3D) mapChildToParent:(CALayer*)child {
	float zPosition = 0;
	CGPoint position = child.position;

- (void) apply3DStartingFrom:(CALayer*)layer {
	CALayer *start = layer;
	CATransform3D transform = CATransform3DIdentity;
	while(start) {
		transform = [self mapChildToParent:start];
		[self apply3DTransform:transform zPosition:0];
		start = start.superlayer;
	}
}

- (CGCorners*) visibleCorners {
	// Rotate, translate and scale through all layers
	CGCorners *corners = [[CGCorners alloc] initWithCGRect:self.bounds];
	[corners applyAllLayerTransforms:self];
	return corners;
}

_______________________________________________
Do not post admin requests to the list. They will be ignored.
Quartz-dev mailing list      (email@hidden)
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/quartz-dev/email@hidden

• Prev by Date: Re: Working out the four points of a sublayerTransform
• Next by Date: Re: Working out the four points of a sublayerTransform
• Previous by thread: Re: Working out the four points of a sublayerTransform
• Next by thread: Re: Working out the four points of a sublayerTransform
• Index(es):
  • Date
  • Thread