For school I need to make a program in JavaScript that says if circles had a collision.
It doesn't need to be shown graphically.
I gave it a try, but my code doesn't seem to work. How can I fix it?
Here's the code I produced:
function collision (p1x, p1y, r1, p2x, p2y, r2) {
var a;
var x;
var y;
a = r1 + r2;
x = p1x - p2x;
y = p1y - p2y;
if (a > (x*x) + (y*y)) {
return true;
} else {
return false;
}
}
var collision = collision(5, 500, 10, 1000, 1500, 1500);
alert(collision);
Your check should be if (a > Math.sqrt((x*x) + (y*y)))
http://cgp.wikidot.com/circle-to-circle-collision-detection
So the complete code is
function collision(p1x, p1y, r1, p2x, p2y, r2) { var a; var x; var y; a = r1 + r2; x = p1x - p2x; y = p1y - p2y; if (a > Math.sqrt((x * x) + (y * y))) { return true; } else { return false; } } var collision = collision(5, 500, 10, 1000, 1500, 1500); console.log(collision);
and for a less computational implementation ( using ES7 syntax for the snippet ) use
const checkCollision = (p1x, p1y, r1, p2x, p2y, r2) => ((r1 + r2) ** 2 > (p1x - p2x) ** 2 + (p1y - p2y) ** 2) var collision = checkCollision(5, 500, 10, 1000, 1500, 1500); console.log(collision);
as Darek Rossman shows in his answer .
In your if statement, try this instead:
if ( a * a > (x * x + y * y) ) {
...
} else {
...
}
The length of a triangle having sides dx
and dy
(ie the distance between points (x1, y1)
and (x2, y2)
where dx = x2 - x1
and dy = y2 - y1
) is equal to:
sqrt(dx^2 + dy^2)
So you probably want:
if(a > Math.sqrt(x*x + y*y)) {
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