From a7e20635cbf8b948f5a31bcb3bbac1fe92b0f03d Mon Sep 17 00:00:00 2001
From: Uli Kusterer <ulivc@zathras.de>
Date: Sun, 14 Mar 2010 23:39:33 +0100
Subject: [PATCH] Handy matrix thingummy for slanting a bezier path or other
 drawings.

---
 NSAffineTransform+Shearing.h | 16 ++++++++++++++++
 NSAffineTransform+Shearing.m | 28 ++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+)
 create mode 100644 NSAffineTransform+Shearing.h
 create mode 100644 NSAffineTransform+Shearing.m

diff --git a/NSAffineTransform+Shearing.h b/NSAffineTransform+Shearing.h
new file mode 100644
index 0000000..4efae23
--- /dev/null
+++ 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
new file mode 100644
index 0000000..1dce3a8
--- /dev/null
+++ b/NSAffineTransform+Shearing.m
@@ -0,0 +1,28 @@
+//
+//  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