Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;

import android.graphics.Canvas;
import android.graphics.Rect;

public class Main {
    public static Bitmap scrambleImage(Bitmap image, int piecesPerLine) {
        int px = (int) Math.ceil(image.getWidth() / (double) piecesPerLine);
        int ph = (int) Math.ceil(image.getHeight() / (double) piecesPerLine);
        int count = piecesPerLine * piecesPerLine;
        int[] arr = shuffle(arrayRange(count));

        Config config = image.getConfig() == null ? Bitmap.Config.ARGB_8888 : image.getConfig();
        Bitmap destBmp = Bitmap.createBitmap(image.getWidth(), image.getHeight(), config);
        Canvas canvas = new Canvas(destBmp);

        for (int i = 0; i < piecesPerLine; i++) {
            for (int j = 0; j < piecesPerLine; j++) {
                int n = arr[i * piecesPerLine + j];
                int row = n / piecesPerLine;
                int col = n % piecesPerLine;

                Rect fromRect = new Rect(row * px, col * ph, row * px + px, col * ph + ph);
                Rect toRect = new Rect(j * px, i * ph, j * px + px, i * ph + ph);

                canvas.drawBitmap(image, fromRect, toRect, null);
            }
        }

        return destBmp;
    }

    public static int[] shuffle(int[] arr) {
        for (int i = arr.length - 1; i >= 0; --i) {
            // swap indexes
            int r = (int) Math.rint(Math.random() * i);
            int t = arr[i];
            arr[i] = arr[r];
            arr[r] = t;
        }

        return arr;
    }

    public static int[] arrayRange(int count) {
        int[] arr = new int[count];

        for (int i = 0; i < count; i++) {
            arr[i] = i;
        }
        return arr;
    }
}