Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright (C) 2014 ChatWing
 *
 * 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.
 */

import android.graphics.Bitmap;

import android.graphics.Canvas;

import android.graphics.RectF;

public class Main {
    public static Bitmap scaleCenterCrop(Bitmap source, int newHeight, int newWidth) {
        int sourceWidth = source.getWidth();
        int sourceHeight = source.getHeight();

        // Compute the scaling factors to fit the new height and width, respectively.
        // To cover the final image, the final scaling will be the bigger
        // of these two.
        float xScale = (float) newWidth / sourceWidth;
        float yScale = (float) newHeight / sourceHeight;
        float scale = Math.max(xScale, yScale);

        // Now get the size of the source bitmap when scaled
        float scaledWidth = scale * sourceWidth;
        float scaledHeight = scale * sourceHeight;

        // Let's find out the upper left coordinates if the scaled bitmap
        // should be centered in the new size give by the parameters
        float left = (newWidth - scaledWidth) / 2;
        float top = (newHeight - scaledHeight) / 2;

        // The target rectangle for the new, scaled version of the source bitmap will now
        // be
        RectF targetRect = new RectF(left, top, left + scaledWidth, top + scaledHeight);

        // Finally, we create a new bitmap of the specified size and draw our new,
        // scaled bitmap onto it.
        Bitmap dest = Bitmap.createBitmap(newWidth, newHeight, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(dest);
        canvas.drawBitmap(source, null, targetRect, null);

        return dest;
    }
}