Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Apache License 

import android.graphics.Rect;

public class Main {
    /**
     * Method for finding the flag given its index.
     * @param index The index of the flag of one of the 32 countries.
     * @param width The width of the source image.
     * @return Rect
     * 
     * <p>
     * Usage for BitmapRegiondDecoder.
     *  It decodes a region of a bitmap. 
     *  It can be very useful if you only need a region of a large image.
     *  <p>
     */
    public static Rect getRectForIndex(int index, int width, int countAllImages, int countPerRow, int space) {
        // check if index is valid
        if (index < 0 && index >= countAllImages)
            throw new IllegalArgumentException("Index must be between 0 and 31.");

        // calculate one side of a single flag
        int oneSide = (width - ((countPerRow + 1) * space)) / countPerRow;

        // calculate the row and col of the given index
        int row = (index / countPerRow);
        int col = (index % countPerRow);

        // left and right sides of the rectangle
        int left = (oneSide * col) + (space * (col + 1));
        int right = left + oneSide;

        // top and bottom sides of the rectangle
        int top = (oneSide * row) + (space * (row + 1));
        int bottom = top + oneSide;

        // the resulting rectangle
        return new Rect(left, top, right, bottom);
    }
}