作物可绘制坊 [英] Crop Drawable to Square

问题描述

我有我已经调整到合适的所需高度（25dp）一个绘制，而宽度按比例缩放。不过，我想它的形象是正方形，25dp的宽度为好。不过，我不希望扭曲的形象，所以我期待裁剪右侧等分离开了绘制的给​​我中心25dpx25dp。这可能吗？怎么样？我一直在努力，在过去两个小时，我对准备认输...

解决方案

位图目标= Bitmap.createBitmap（宽度，高度，Config.ARGB_8888）;
帆布帆布=新的Canvas（目标）
浮HSCALE =宽/（浮点）source.getWidth（）;
浮VSCALE =身高/（浮点）source.getHeight（）;
浮规模= Math.min（HSCALE，VSCALE）;
字模=新的Matrix（）;
matrix.setScale（秤，秤）;
matrix.postTranslate（宽度/ 2  -  source.getWidth（）/ 2 *刻度，高度/ 2  -  source.getHeight（）/ 2 *标度）;
canvas.drawColor（Color.BLACK）;
canvas.drawBitmap（源，矩阵，新的油漆（））;

I have a drawable that I have resized to the appropriate desired height (25dp), and the width is scaled proportionally. However, I want an image that is square, with a width of 25dp as well. However, I do not want to distort the image, so I am looking to to crop equal portions of the right and left of the drawable to give me the center 25dpx25dp. Is this possible? How? I have been trying for the past two hours and I'm about ready to throw in the towel...

解决方案

Bitmap target= Bitmap.createBitmap(width, height,Config.ARGB_8888);
Canvas canvas = new Canvas(target) 
float hScale = width/(float)source.getWidth();
float vScale = height/(float)source.getHeight();
float scale = Math.min(hScale, vScale);
Matrix matrix = new Matrix();
matrix.setScale(scale, scale);
matrix.postTranslate(width/2 - source.getWidth()/2 * scale, height/2 - source.getHeight()/2 * scale);
canvas.drawColor(Color.BLACK);
canvas.drawBitmap(source, matrix, new Paint());

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