Hey i'm trying to get the side with which the two objects in the canvas collide. Here's what i'm using for collision detection, but it only checks for a collision, without a specific side.

Where o1 and o2 are objects taht have properties:

x - position on the X axis
y - position on the Y axis
w - the width of the rectangle
h - the height of the rectangle

var collidesWith = function (o2) {
    var o1 = this;
    if ((o1.y + o1.h) < o2.y) {
        return 0;
    }
    if (o1.y > (o2.y + o2.h)) {
        return 0;
    }
    if ((o1.x + o1.w) < o2.x) {
        return 0;
    }
    if (o1.x > (o2.x + o2.w)) {
        return 0;
    }
    return 1;
};

EDIT: Here's the code i came up for the collision detection on the top of the element:

if (
    (o1.y - o1.dy >= o2.y) &&
    (o1.y - o1.dy <= o2.y + o2.h) &&
    (o1.x + o1.w >= o2.x) &&
    (o1.x <= o2.x + o2.w)
) {
    // We have collision at the top end
}

Hey i'm trying to get the side with which the two objects in the canvas collide. Here's what i'm using for collision detection, but it only checks for a collision, without a specific side.

Where o1 and o2 are objects taht have properties:

x - position on the X axis
y - position on the Y axis
w - the width of the rectangle
h - the height of the rectangle

var collidesWith = function (o2) {
    var o1 = this;
    if ((o1.y + o1.h) < o2.y) {
        return 0;
    }
    if (o1.y > (o2.y + o2.h)) {
        return 0;
    }
    if ((o1.x + o1.w) < o2.x) {
        return 0;
    }
    if (o1.x > (o2.x + o2.w)) {
        return 0;
    }
    return 1;
};

EDIT: Here's the code i came up for the collision detection on the top of the element:

if (
    (o1.y - o1.dy >= o2.y) &&
    (o1.y - o1.dy <= o2.y + o2.h) &&
    (o1.x + o1.w >= o2.x) &&
    (o1.x <= o2.x + o2.w)
) {
    // We have collision at the top end
}

• javascript
• html
• canvas
• collision

Share Improve this question Follow edited Feb 27, 2011 at 11:49 Pockata asked Feb 23, 2011 at 22:26 PockataPockata 1,57833 gold badges1313 silver badges1313 bronze badges

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1 Answer 1

Sorted by: Reset to default 8

You need double-conditions like this:

if ((o1.y > o2.y) && (o1.y < o2.y + o2.h)) {
  return 'top'; // o1's top border collided with o2's bottom border
}

Similarily for other sides.