矩形操作工具箱

/*
* Copyright (C) 2013 Peng fei Pan <sky@xiaopan.me>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*   http://www.apache.org/licenses/LICENSE-2.0 *
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

package me.xiaopan.android.graphics;

import android.graphics.Point;
import android.graphics.Rect;

/**
* 矩形操作工具箱
*/
public class RectUtils {
/**
* 缩放Rect
* @param rect
* @param scaleX
* @param scaleY
* @return rect
*/
public static Rect zoom(Rect rect, float scaleX, float scaleY){
rect.left *= scaleX;
rect.top *= scaleY;
rect.right *= scaleX;
rect.bottom *= scaleY;
return rect;
}

/**
* 缩放Rect
* @param rect
* @param scale
* @return rect
*/
public static Rect zoom(Rect rect, float scale){
rect.left *= scale;
rect.top *= scale;
rect.right *= scale;
rect.bottom *= scale;
return rect;
}

/**
* 映射矩形，将源尺寸中的一个矩形映射到目标尺寸中
* @param rectIntSourceSize 源尺寸中的一个矩形
* @param sourceSize 源尺寸
* @param targetSize 目标尺寸
* @return 源尺寸中的矩形映射到目标尺寸中后的矩形
*/
public static Rect mapping(Rect rectIntSourceSize, Point sourceSize, Point targetSize){
Rect rect = new Rect(rectIntSourceSize);
float scaleX = (float) targetSize.x / sourceSize.x;
float scaleY = (float) targetSize.y / sourceSize.y;
rect.left *= scaleX;
rect.top *= scaleY;
rect.right *= scaleX;
rect.bottom *= scaleY;
return rect;
}

/**
* 映射矩形，将源尺寸中的一个矩形映射到目标尺寸中
* @param rectIntSourceSize 源尺寸中的一个矩形
* @param sourceSize 源尺寸
* @param targetSize 目标尺寸
* @param isTargetSizeInterchange 是否将targetSize的宽高互换
* @return 源尺寸中的矩形映射到目标尺寸中后的矩形
*/
public static Rect mapping(Rect rectIntSourceSize, Point sourceSize, Point targetSize, boolean isTargetSizeInterchange){
if(isTargetSizeInterchange){
targetSize.x = targetSize.x + targetSize.y;
targetSize.y = targetSize.x - targetSize.y;
targetSize.x = targetSize.x - targetSize.y;
}
Rect rect = new Rect(rectIntSourceSize);
float scaleX = (float) targetSize.x / sourceSize.x;
float scaleY = (float) targetSize.y / sourceSize.y;
rect.left *= scaleX;
rect.top *= scaleY;
rect.right *= scaleX;
rect.bottom *= scaleY;
return rect;
}
}