Java tutorial
//package com.java2s; //License from project: Apache License public class Main { public static float calculateScale(int originalWidth, int originalHeight, int expectWidth, int expectHeight, boolean zoomScale) { return zoomScale ? calculateZoomScale(originalWidth, originalHeight, expectWidth, expectHeight) : calculateShrinkScale(originalWidth, originalHeight, expectWidth, expectHeight); } public static float calculateZoomScale(int originalWidth, int originalHeight, int expectWidth, int expectHeight) { float hScale = expectWidth / (float) originalWidth; float vScale = expectHeight / (float) originalHeight; return Math.max(hScale, vScale); } public static float calculateShrinkScale(int originalWidth, int originalHeight, int expectWidth, int expectHeight) { float hScale = expectWidth / (float) originalWidth; float vScale = expectHeight / (float) originalHeight; return Math.min(hScale, vScale); } }