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77 lines
2.1 KiB
Objective-C
77 lines
2.1 KiB
Objective-C
//
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// ScaledImageView.m
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//
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// Created by Greg Neagle on 5/27/09.
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//
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// Copyright 2009 Greg Neagle.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#import "ScaledImageView.h"
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@implementation ScaledImageView
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-(void)drawRect:(NSRect *)rect {
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NSRect dstRect = [self bounds];
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float sourceWidth = [[self image] size].width;
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float sourceHeight = [[self image] size].height;
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float targetWidth = dstRect.size.width;
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float targetHeight = dstRect.size.height;
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// Calculate aspect ratios
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float sourceRatio = sourceWidth / sourceHeight;
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float targetRatio = targetWidth / targetHeight;
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// Determine what side of the source image to use for proportional scaling
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BOOL scaleWidth = (sourceRatio <= targetRatio);
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// Proportionally scale source image
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float scalingFactor, scaledWidth, scaledHeight;
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if (scaleWidth) {
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scalingFactor = 1.0 / sourceRatio;
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scaledWidth = targetWidth;
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scaledHeight = round(targetWidth * scalingFactor);
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} else {
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scalingFactor = sourceRatio;
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scaledWidth = round(targetHeight * scalingFactor);
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scaledHeight = targetHeight;
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}
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float scaleFactor = scaledHeight / sourceHeight;
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// Calculate compositing rectangles
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NSRect sourceRect;
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float destX, destY;
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// Crop from center
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destX = round((scaledWidth - targetWidth) / 2.0);
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destY = round((scaledHeight - targetHeight) / 2.0);
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sourceRect = NSMakeRect(destX / scaleFactor, destY / scaleFactor,
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targetWidth / scaleFactor, targetHeight / scaleFactor);
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[[self image] drawInRect:dstRect
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fromRect:sourceRect
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operation:NSCompositeSourceOver
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fraction:1.0];
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}
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@end
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