function $_collision(a, b){var c = a.x- b.x,
d = a.y- b.y,
e = a.r+ b.r;return c * c + d * d <= e * e
}
$_collision({
x:150,
y:200,
r:100},{
x:100,
y:150,
r:200});// true
function $_collision(a, b) {
var c = a.x — b.x,
d = a.y — b.y,
e = a.r + b.r;
return c * c + d * d <= e * e
}
$_collision({
x: 150,
y: 200,
r: 100
}, {
x: 100,
y: 150,
r: 200
}); // true
