Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 *  COPYRIGHT NOTICE  
 *  Copyright (C) 2015, Jhuster <lujun.hust@gmail.com>
 *  https://github.com/Jhuster/Android
 *   
 *  @license under the Apache License, Version 2.0 
 *
 *  @file    BitmapHelper.java
 *  @brief   Bitmap processor, include load,save,rotate,crop etc.
 *  
 *  @version 1.0     
 *  @author  Jhuster
 *  @date    2015/11/20    
 */

import android.graphics.Bitmap;

import android.graphics.Canvas;
import android.graphics.Matrix;

public class Main {
    public static Bitmap rotateWithCanvas(Bitmap bitmap, int degrees) {

        int destWidth, destHeight;

        float centerX = bitmap.getWidth() / 2;
        float centerY = bitmap.getHeight() / 2;

        // We want to do the rotation at origin, but since the bounding
        // rectangle will be changed after rotation, so the delta values
        // are based on old & new width/height respectively.
        Matrix matrix = new Matrix();
        matrix.preTranslate(-centerX, -centerY);
        matrix.postRotate(degrees);
        if (degrees / 90 % 2 == 0) {
            destWidth = bitmap.getWidth();
            destHeight = bitmap.getHeight();
            matrix.postTranslate(centerX, centerY);
        } else {
            destWidth = bitmap.getHeight();
            destHeight = bitmap.getWidth();
            matrix.postTranslate(centerY, centerX);
        }
        Bitmap cropped = Bitmap.createBitmap(destWidth, destHeight, Bitmap.Config.RGB_565);
        Canvas canvas = new Canvas(cropped);
        canvas.drawBitmap(bitmap, matrix, null);
        return cropped;
    }
}