Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright (C) 2008 Romain Guy
 *
 * 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.Paint;

import android.graphics.Matrix;
import android.graphics.Rect;
import android.graphics.RectF;

public class Main {
    private static final float EDGE_START = 0.0f;
    private static final float EDGE_END = 4.0f;
    private static final Paint EDGE_PAINT = new Paint();
    private static final Paint END_EDGE_PAINT = new Paint();
    private static final float FOLD_START = 5.0f;
    private static final float FOLD_END = 13.0f;
    private static final Paint FOLD_PAINT = new Paint();
    private static final float SHADOW_RADIUS = 12.0f;
    private static final Paint SHADOW_PAINT = new Paint();
    private static final Paint SCALE_PAINT = new Paint(Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG);
    private static volatile Matrix sScaleMatrix;

    /**
     * Create a book cover with the specified bitmap. This method applies several
     * lighting effects to the original bitmap and returns a new decored bitmap.
     *
     * @param bitmap The bitmap to decor with lighting effects
     * @param width The target width of the decored bitmap
     * @param height The target height of the decored bitmap
     *
     * @return A new Bitmap based on the original bitmap
     */
    public static Bitmap createBookCover(Bitmap bitmap, int width, int height) {
        final int bitmapWidth = bitmap.getWidth();
        final int bitmapHeight = bitmap.getHeight();

        final float scale = Math.min((float) width / (float) bitmapWidth, (float) height / (float) bitmapHeight);

        final int scaledWidth = (int) (bitmapWidth * scale);
        final int scaledHeight = (int) (bitmapHeight * scale);

        final Bitmap decored = createScaledBitmap(bitmap, scaledWidth, scaledHeight, SHADOW_RADIUS, true,
                SHADOW_PAINT);
        final Canvas canvas = new Canvas(decored);

        canvas.translate(SHADOW_RADIUS / 2.0f, SHADOW_RADIUS / 2.0f);
        canvas.drawRect(EDGE_START, 0.0f, EDGE_END, scaledHeight, EDGE_PAINT);
        canvas.drawRect(FOLD_START, 0.0f, FOLD_END, scaledHeight, FOLD_PAINT);
        //noinspection PointlessArithmeticExpression
        canvas.translate(scaledWidth - (EDGE_END - EDGE_START), 0.0f);
        canvas.drawRect(EDGE_START, 0.0f, EDGE_END, scaledHeight, END_EDGE_PAINT);

        return decored;
    }

    private static Bitmap createScaledBitmap(Bitmap src, int dstWidth, int dstHeight, float offset,
            boolean clipShadow, Paint paint) {

        Matrix m;
        synchronized (Bitmap.class) {
            m = sScaleMatrix;
            sScaleMatrix = null;
        }

        if (m == null) {
            m = new Matrix();
        }

        final int width = src.getWidth();
        final int height = src.getHeight();
        final float sx = dstWidth / (float) width;
        final float sy = dstHeight / (float) height;
        m.setScale(sx, sy);

        Bitmap b = createBitmap(src, 0, 0, width, height, m, offset, clipShadow, paint);

        synchronized (Bitmap.class) {
            sScaleMatrix = m;
        }

        return b;
    }

    private static Bitmap createBitmap(Bitmap source, int x, int y, int width, int height, Matrix m, float offset,
            boolean clipShadow, Paint paint) {

        int scaledWidth = width;
        int scaledHeight = height;

        final Canvas canvas = new Canvas();
        canvas.translate(offset / 2.0f, offset / 2.0f);

        Bitmap bitmap;

        final Rect from = new Rect(x, y, x + width, y + height);
        final RectF to = new RectF(0, 0, width, height);

        if (m == null || m.isIdentity()) {
            bitmap = Bitmap.createBitmap(scaledWidth + (int) offset,
                    scaledHeight + (int) (clipShadow ? (offset / 2.0f) : offset), Bitmap.Config.ARGB_8888);
            paint = null;
        } else {
            RectF mapped = new RectF();
            m.mapRect(mapped, to);

            scaledWidth = Math.round(mapped.width());
            scaledHeight = Math.round(mapped.height());

            bitmap = Bitmap.createBitmap(scaledWidth + (int) offset,
                    scaledHeight + (int) (clipShadow ? (offset / 2.0f) : offset), Bitmap.Config.ARGB_8888);
            canvas.translate(-mapped.left, -mapped.top);
            canvas.concat(m);
        }

        canvas.setBitmap(bitmap);
        canvas.drawRect(0.0f, 0.0f, width, height, paint);
        canvas.drawBitmap(source, from, to, SCALE_PAINT);

        return bitmap;
    }
}