Handy matrix thingummy for slanting a bezier path or other drawings.

jawngee · Mar 14, 2010 · a7e2063 · a7e2063
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diff --git a/NSAffineTransform+Shearing.h b/NSAffineTransform+Shearing.h
@@ -0,0 +1,16 @@
+//
+//  NSAffineTransform+Shearing.h
+//  Propaganda
+//
+//  Created by Uli Kusterer on 14.03.10.
+//  Copyright 2010 The Void Software. All rights reserved.
+//
+
+#import <Cocoa/Cocoa.h>
+
+
+@interface NSAffineTransform (UKShearing)
+
+-(void)	shearXBy: (CGFloat)xFraction yBy: (CGFloat)yFraction;
+
+@end
diff --git a/NSAffineTransform+Shearing.m b/NSAffineTransform+Shearing.m
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+//
+//  NSAffineTransform+Shearing.m
+//  Propaganda
+//
+//  Created by Uli Kusterer on 14.03.10.
+//  Copyright 2010 The Void Software. All rights reserved.
+//
+
+#import "NSAffineTransform+Shearing.h"
+
+
+@implementation NSAffineTransform (UKShearing)
+
+-(void)	shearXBy: (CGFloat)xFraction yBy: (CGFloat)yFraction
+{
+	NSAffineTransform*		theTransform = [NSAffineTransform transform];
+	NSAffineTransformStruct	transformStruct = { 0 };
+
+	transformStruct.m11 = 1.0;
+	transformStruct.m12 = yFraction;
+	transformStruct.m21 = xFraction;
+	transformStruct.m22 = 1.0;
+
+	[theTransform setTransformStruct: transformStruct];
+	[self prependTransform: theTransform];
+}
+
+@end