is Collision Detected between two Bitmap - Android Graphics

Android examples for Graphics:Canvas

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Description

is Collision Detected between two Bitmap

Demo Code


//package com.java2s;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.graphics.Rect;

public class Main {
    public static boolean isCollisionDetected(Bitmap bitmap1, int x1,
            int y1, Bitmap bitmap2, int x2, int y2) {

        Rect bounds1 = new Rect(x1, y1, x1 + bitmap1.getWidth(), y1
                + bitmap1.getHeight());/*  ww  w  .ja v  a 2s . c om*/
        Rect bounds2 = new Rect(x2, y2, x2 + bitmap2.getWidth(), y2
                + bitmap2.getHeight());

        if (Rect.intersects(bounds1, bounds2)) {
            Rect collisionBounds = getCollisionBounds(bounds1, bounds2);
            for (int i = collisionBounds.left; i < collisionBounds.right; i++) {
                for (int j = collisionBounds.top; j < collisionBounds.bottom; j++) {
                    int bitmap1Pixel = bitmap1.getPixel(i - x1, j - y1);
                    int bitmap2Pixel = bitmap2.getPixel(i - x2, j - y2);
                    if (isFilled(bitmap1Pixel) && isFilled(bitmap2Pixel)) {
                        return true;
                    }
                }
            }
        }
        return false;
    }

    private static Rect getCollisionBounds(Rect rect1, Rect rect2) {
        int left = (int) Math.max(rect1.left, rect2.left);
        int top = (int) Math.max(rect1.top, rect2.top);
        int right = (int) Math.min(rect1.right, rect2.right);
        int bottom = (int) Math.min(rect1.bottom, rect2.bottom);
        return new Rect(left, top, right, bottom);
    }

    private static boolean isFilled(int pixel) {
        return pixel != Color.TRANSPARENT;
    }
}

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