Collision detection between two images in java

Question

I need to know when the rocket hit the meteor, img2 is the meteor and img is the rocket

g.drawImage(img, posX - img.getWidth(this)/2, posY - img.getHeight(this), this);
        g.drawImage(img2,posX1 - img2.getWidth(this), posY1 - img2.getHeight(this),this);
        System.out.println(posY-img.getWidth(this));
        System.out.println(posY1);
      }
      public void colid (){
        if (posY1+img.getWidth(this)>= posY-img2.getWidth(this) ){

            System.out.println("teste");
        }

Please fix your code, as it stands, it will not compile (are there missing lines above the first curly bracket?) — blurfus, Apr 01 '16 at 23:14
Do you just want to do simple rectangular collision, for [example](http://stackoverflow.com/questions/30251027/creating-many-objects-with-collision-properties-java/30251268#30251268), [exmaple](http://stackoverflow.com/questions/21153110/brick-collision-java/21153384#21153384), [example](http://stackoverflow.com/questions/20927189/detecting-collision-of-two-sprites-that-can-rotate/20928531#20928531), [example](http://stackoverflow.com/questions/13261767/java-ball-object-doesnt-bounce-off-of-drawn-rectangles-like-its-supposed-to/13263022#13263022) — MadProgrammer, Apr 01 '16 at 23:19
Or do you want to know when the non-alpha pixels collide, for [example](http://stackoverflow.com/questions/23332096/how-to-detect-if-two-images-collide-in-java/23332186#23332186)? — MadProgrammer, Apr 01 '16 at 23:20

score 0 · Accepted Answer · answered Apr 01 '16 at 23:22

You can create a Rectangle for every object like for a rocket or meteor

and there is a Rectangle method you can use

boolean intersects(Rectangle r)
Determines whether or not this Rectangle and the specified Rectangle intersect.

so you could check

if (rectangleA.intersects(rectangleB){
 System.out.println("Colliosion!!")
}

score 0 · Answer 2 · answered Apr 01 '16 at 23:24

This should do it

        Rectangle r1 = new Rectangle(posX - img.getWidth(this)/2, posY - img.getHeight(this), img.getWidth(this), img.getHeight(this));
        Rectangle r2 = new Rectangle(posX1 - img2.getWidth(this), posY1 - img2.getHeight(this), img2.getWidth(this), img2.getHeight(this));

        boolean collision = r1.intersects(r2);

Note: You are dividing the width with 2 in the first image and not the second. Maybe it is as it should be but just want to let you know if it is not.

He gave almost certain but it was only in the center even changing the image position — Giovanni, Apr 02 '16 at 00:08

Collision detection between two images in java

2 Answers2