How to Implement Collision Detection in JavaScript without Libraries?

Collision Detection in JavaScript

Problem: Implementing collision detection in JavaScript without using libraries like jQuery or gameQuery for a simple scenario involving moving objects.

Solution:

To detect collisions between two objects, a simple bounding rectangle routine can be used. It calculates whether the rectangles representing each object overlap by comparing their positions and dimensions.

The function isCollide() checks if the rectangles represented by objects a and b intersect:

<code class="javascript">function isCollide(a, b) {
    return !(
        ((a.y + a.height) < (b.y)) ||
        (a.y > (b.y + b.height)) ||
        ((a.x + a.width) < b.x) ||
        (a.x > (b.x + b.width))
    );
}</code>

Where:

• a and b are objects with properties x, y, width, and height.

To use this function, you can create arrays containing the positions of the objects involved in the collision detection. Then, you can iterate over the array to check if the moving object collides with any of the pre-defined objects.

By using this bounding rectangle routine, you can implement basic collision detection in JavaScript without the need for complex algorithms or libraries.

Interactive Example:

Click [here](https://codepen.io/MixerOID/pen/Rwgeob) to see a demonstration of the isCollide() function in action, showcasing the detection of collisions between moving objects.

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