javascript detect collision
if (rect1.x < rect2.x + rect2.width &&
rect1.x + rect1.width > rect2.x &&
rect1.y < rect2.y + rect2.height &&
rect1.y + rect1.height > rect2.y) {
// collision detected!
}javascript detect collision
if (rect1.x < rect2.x + rect2.width &&
rect1.x + rect1.width > rect2.x &&
rect1.y < rect2.y + rect2.height &&
rect1.y + rect1.height > rect2.y) {
// collision detected!
}javascript collision detection
function checkCollisions(x1, y1, w1, h1, x2, y2, w2, h2){
if (x1 + w1 >= x2 && x1 + w1 <= x2 + w2 && y1 + h1 >= y2 && y1 + h1 <= y2 + h2) {
return true;
} else if (x1 >= x2 && x1 <= x2 + w2 && y1 >= y2 && y1 <= y2 + h2) {
return true;
} else {
return false;
}
}circle collision javascript
/*
You should call the function resolveCollsion, when a collision between two
circles is detected.
*/
function rotate(velocity, angle) {
const rotatedVelocities = {
x: velocity.x * Math.cos(angle) - velocity.y * Math.sin(angle),
y: velocity.x * Math.sin(angle) + velocity.y * Math.cos(angle)
}
return rotatedVelocities;
}
function resolveCollision(particle, otherParticle) {
/*
the particles passed as parameters should be objects with
x and y position,
a velocity object with x and y values,
a mass value
as attributes
example of a class:
function Circle() {
this.x = x;
this.y = y;
this.velocity = {
x: 5,
y: 5
};
this.mass = 2;
}
*/
const xVelocityDiff = particle.velocity.x - otherParticle.velocity.x;
const yVelocityDiff = particle.velocity.y - otherParticle.velocity.y;
const xDist = otherParticle.x - particle.x;
const yDist = otherParticle.y - particle.y;
if (xVelocityDiff * xDist + yVelocityDiff * yDist >= 0) {
const angle = -Math.atan2(otherParticle.y - particle.y, otherParticle.x - particle.x);
const m1 = particle.mass;
const m2 = otherParticle.mass;
const u1 = rotate(particle.velocity, angle);
const u2 = rotate(otherParticle.velocity, angle);
const v1 = { x: u1.x * (m1 - m2) / (m1 + m2) + u2.x * 2 * m2 / (m1 + m2), y: u1.y };
const v2 = { x: u2.x * (m1 - m2) / (m1 + m2) + u1.x * 2 * m2 / (m1 + m2), y: u2.y };
const vFinal1 = rotate(v1, -angle);
const vFinal2 = rotate(v2, -angle);
particle.velocity.x = vFinal1.x;
particle.velocity.y = vFinal1.y;
otherParticle.velocity.x = vFinal2.x;
otherParticle.velocity.y = vFinal2.y;
}
}
/*
source:
https://youtu.be/789weryntzM
*/Copyright © 2021 Codeinu
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