Collision between two rects

Programming Questions

RobertC.

in Programming Questions • 1 year ago

Does any body know how to detect and implement collisions between two 50x50 rects? I am using the selter.motion library with Processing 2.0a6. Here is my detection code:

boolean bouncing() {

return ????;

}

And my bouncing code:

if(!bouncing()) {

background(128);

// all my code

} else {

mp.springTo((mp.getX() - mb.getX())*(-1), ((mp.getY() - mb.getY())*(-1)));

mb.springTo((mb.getX() - mp.getX())-1, ((mb.getY() - mp.getY())-1));

}

Thanks!

Replies(4)

calsign

Re: Collision between two rects

1 year ago

If you're using seltar.motion... shouldn't this be in the Contributed Library Questions section?
If it's anything like a normal rectangle... this has been asked numerous times before.

Here's an article on the Wiki...

asimes

Re: Collision between two rects

1 year ago

float x1, y1, x2, y2; // These are the rects' top left positions
if (x2 > x1 && x2 < x1+50) { // Collision on x-axis
if (y2 > y1 && y2 < y1+50) { // Collision on y-axis
println("Collision!");
}
}

RobertC.

Re: Collision between two rects

1 year ago

Calsign, this has nothing to do with the seltar.motion lib except the fact that I am using it to record motion and execute it.

Asimes, thanks, I would have never thought of that myself.

But, the big question of mine remains: How to make them bounce.

asimes

Re: Collision between two rects

1 year ago

// These are arbitrary
float speedX = 2.0;
float speedY = 3.0;
void draw() {
x1 += speedX;
y1 += speedY;
if (a collision happened) {
// This may or may not be needed, not tested
// x1 -= speedX;
// y1 -= speedY;
// Reverse direction
speedX *= -1;
speedY *= -1;
}
}

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