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Code Snippets > Graphical Effects ( Created 06 March 2011 | Last Edited 06 March 2011) NSImage Nine-Part Drawing by Cower | No Votes A category that adds simplified nine-part image drawing to NSImage Written in Objective-C This is a fairly simple category add-on to NSImage that allows you to draw a given image with stretching applied only to its middle while respecting the cap sizes on the corners. I tried to add support for having non-caps in some cases, but I honestly can't think of a scenario where that would be useful, so it's untested (and, as a result, there are a number of conditionals in the drawing code that might break it if you don't specify all four caps). Essentially, it lets you take this image: And draw it like so: The methods are fairly simple, so I don't think I need to explain them here. FYI: this code is licensed under the zlib/libpng license. This basically means you can do whatever the hell you want with it provided you don't claim you wrote it, but you should ask your lawyer if you have any questions. /* * NSImage+NinePatchDrawing.h * * Copyright (c) 2011 Noel R. Cower * * This software is provided 'as-is', without any express or implied * warranty. In no event will the authors be held liable for any damages * arising from the use of this software. * * Permission is granted to anyone to use this software for any purpose, * including commercial applications, and to alter it and redistribute it * freely, subject to the following restrictions: * * 1. The origin of this software must not be misrepresented; you must not * claim that you wrote the original software. If you use this software * in a product, an acknowledgment in the product documentation would be * appreciated but is not required. * * 2. Altered source versions must be plainly marked as such, and must not be * misrepresented as being the original software. * * 3. This notice may not be removed or altered from any source * distribution. * */ #import <Cocoa/Cocoa.h> extern const CGFloat NNoCap; @interface NSImage (NinePatchDrawing) - (void)drawInRect:(NSRect)dstSpacePortionRect operation:(NSCompositingOperation)op fraction:(CGFloat)requestedAlpha respectFlipped:(BOOL)respectContextIsFlipped hints:(NSDictionary *)hints topCap:(CGFloat)top bottomCap:(CGFloat)bottom leftCap:(CGFloat)left rightCap:(CGFloat)right; - (void)drawInRect:(NSRect)dstSpacePortionRect topCap:(CGFloat)top bottomCap:(CGFloat)bottom leftCap:(CGFloat)left rightCap:(CGFloat)right; - (void)drawInRect:(NSRect)dstSpacePortionRect heightCap:(CGFloat)heightCap widthCap:(CGFloat)widthCap; - (void)drawInRect:(NSRect)dstSpacePortionRect withCap:(CGFloat)cap; @end --> /* * NSImage+NinePatchDrawing.m * * Copyright (c) 2011 Noel R. Cower * * This software is provided 'as-is', without any express or implied * warranty. In no event will the authors be held liable for any damages * arising from the use of this software. * * Permission is granted to anyone to use this software for any purpose, * including commercial applications, and to alter it and redistribute it * freely, subject to the following restrictions: * * 1. The origin of this software must not be misrepresented; you must not * claim that you wrote the original software. If you use this software * in a product, an acknowledgment in the product documentation would be * appreciated but is not required. * * 2. Altered source versions must be plainly marked as such, and must not be * misrepresented as being the original software. * * 3. This notice may not be removed or altered from any source * distribution. * */ #import "NSImage+NinePatchDrawing.h" const CGFloat NNoCap = -1; @implementation NSImage (NinePatchDrawing) - (void)drawInRect:(NSRect)dstSpacePortionRect topCap:(CGFloat)top bottomCap:(CGFloat)bottom leftCap:(CGFloat)left rightCap:(CGFloat)right { [self drawInRect:dstSpacePortionRect operation:NSCompositeSourceOver fraction:1.0 respectFlipped:YES hints:nil topCap:top bottomCap:left leftCap:bottom rightCap:right]; } - (void)drawInRect:(NSRect)dstSpacePortionRect heightCap:(CGFloat)heightCap widthCap:(CGFloat)widthCap { [self drawInRect:dstSpacePortionRect operation:NSCompositeSourceOver fraction:1.0 respectFlipped:YES hints:nil topCap:heightCap bottomCap:heightCap leftCap:widthCap rightCap:widthCap]; } - (void)drawInRect:(NSRect)dstSpacePortionRect withCap:(CGFloat)cap { [self drawInRect:dstSpacePortionRect operation:NSCompositeSourceOver fraction:1.0 respectFlipped:YES hints:nil topCap:cap bottomCap:cap leftCap:cap rightCap:cap]; } - (void)drawInRect:(NSRect)dstSpacePortionRect operation:(NSCompositingOperation)op fraction:(CGFloat)requestedAlpha respectFlipped:(BOOL)respectContextIsFlipped hints:(NSDictionary *)hints topCap:(CGFloat)top bottomCap:(CGFloat)bottom leftCap:(CGFloat)left rightCap:(CGFloat)right { top = fmax(top, 0); bottom = fmax(bottom, 0); left = fmax(left, 0); right = fmax(right, 0); NSSize size = [self size]; NSRect srcRect = NSZeroRect; NSRect dstRect = dstSpacePortionRect; srcRect.size.width = left; srcRect.size.height = bottom; dstRect.size = srcRect.size; if (bottom > 0) { if (left > 0) { [self drawInRect:dstRect fromRect:srcRect operation:op fraction:requestedAlpha respectFlipped:respectContextIsFlipped hints:hints]; } dstRect.origin.x += (srcRect.origin.x = left); dstRect.size.width = dstSpacePortionRect.size.width - (left + right); srcRect.size.width = size.width - left - right; [self drawInRect:dstRect fromRect:srcRect operation:op fraction:requestedAlpha respectFlipped:respectContextIsFlipped hints:hints]; dstRect.origin.x = (dstSpacePortionRect.origin.x + dstSpacePortionRect.size.width) - right; srcRect.origin.x = size.width - right; dstRect.size.width = srcRect.size.width = right; if (right > 0) { [self drawInRect:dstRect fromRect:srcRect operation:op fraction:requestedAlpha respectFlipped:respectContextIsFlipped hints:hints]; } } srcRect.size.height = size.height - (bottom + top); dstRect.size.height = dstSpacePortionRect.size.height - (bottom + top); dstRect.origin.y = dstSpacePortionRect.origin.y + (srcRect.origin.y = bottom); if (right > 0) { [self drawInRect:dstRect fromRect:srcRect operation:op fraction:requestedAlpha respectFlipped:respectContextIsFlipped hints:hints]; } if (left > 0) { srcRect.origin.x = 0; dstRect.origin.x = dstSpacePortionRect.origin.x; dstRect.size.width = srcRect.size.width = left; [self drawInRect:dstRect fromRect:srcRect operation:op fraction:requestedAlpha respectFlipped:respectContextIsFlipped hints:hints]; } dstRect.origin.x = dstSpacePortionRect.origin.x + (srcRect.origin.x = left); dstRect.size.width = dstSpacePortionRect.size.width - (left + right); srcRect.size.width = size.width - left - right; [self drawInRect:dstRect fromRect:srcRect operation:op fraction:requestedAlpha respectFlipped:respectContextIsFlipped hints:hints]; if (top > 0) { srcRect.origin.y = size.height - top; dstRect.origin.y = (dstSpacePortionRect.origin.y + dstSpacePortionRect.size.height) - top; dstRect.size.height = srcRect.size.height = top; [self drawInRect:dstRect fromRect:srcRect operation:op fraction:requestedAlpha respectFlipped:respectContextIsFlipped hints:hints]; if (right > 0) { srcRect.origin.x = size.width - right; dstRect.origin.x = (dstSpacePortionRect.origin.x + dstSpacePortionRect.size.width) - right; srcRect.size.width = dstRect.size.width = right; [self drawInRect:dstRect fromRect:srcRect operation:op fraction:requestedAlpha respectFlipped:respectContextIsFlipped hints:hints]; } if (left > 0) { srcRect.origin.x = 0; dstRect.origin.x = dstSpacePortionRect.origin.x; srcRect.size.width = dstRect.size.width = left; [self drawInRect:dstRect fromRect:srcRect operation:op fraction:requestedAlpha respectFlipped:respectContextIsFlipped hints:hints]; } } } @end --> There are no comments for this entry.

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