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Code Issues Wiki Activity

added Query.collides, closes #478

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liabru 2017-11-25 17:19:55 +00:00
parent 3307760e6e
commit 6593a72e46
1 changed files with 36 additions and 18 deletions
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54
src/collision/Query.js
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@ -18,6 +18,38 @@ var Vertices = require('../geometry/Vertices');
(function() { (function() {
/**
* Returns a list of collisions between `body` and `bodies`.
* @method collides
* @param {body} body
* @param {body[]} bodies
* @return {object[]} Collisions
*/
Query.collides = function(body, bodies) {
var collisions = [];
for (var i = 0; i < bodies.length; i++) {
var bodyA = bodies[i];
if (Bounds.overlaps(bodyA.bounds, body.bounds)) {
for (var j = bodyA.parts.length === 1 ? 0 : 1; j < bodyA.parts.length; j++) {
var part = bodyA.parts[j];
if (Bounds.overlaps(part.bounds, body.bounds)) {
var collision = SAT.collides(part, body);
if (collision.collided) {
collisions.push(collision);
break;
}
}
}
}
}
return collisions;
};
/** /**
* Casts a ray segment against a set of bodies and returns all collisions, ray width is optional. Intersection points are not provided. * Casts a ray segment against a set of bodies and returns all collisions, ray width is optional. Intersection points are not provided.
* @method ray * @method ray
@ -35,25 +67,11 @@ var Vertices = require('../geometry/Vertices');
rayX = (endPoint.x + startPoint.x) * 0.5, rayX = (endPoint.x + startPoint.x) * 0.5,
rayY = (endPoint.y + startPoint.y) * 0.5, rayY = (endPoint.y + startPoint.y) * 0.5,
ray = Bodies.rectangle(rayX, rayY, rayLength, rayWidth, { angle: rayAngle }), ray = Bodies.rectangle(rayX, rayY, rayLength, rayWidth, { angle: rayAngle }),
collisions = []; collisions = Query.collides(ray, bodies);
for (var i = 0; i < bodies.length; i++) { for (var i = 0; i < collisions.length; i += 1) {
var bodyA = bodies[i]; var collision = collisions[i];
collision.body = collision.bodyB = collision.bodyA;
if (Bounds.overlaps(bodyA.bounds, ray.bounds)) {
for (var j = bodyA.parts.length === 1 ? 0 : 1; j < bodyA.parts.length; j++) {
var part = bodyA.parts[j];
if (Bounds.overlaps(part.bounds, ray.bounds)) {
var collision = SAT.collides(part, ray);
if (collision.collided) {
collision.body = collision.bodyA = collision.bodyB = bodyA;
collisions.push(collision);
break;
}
}
}
}
} }
return collisions; return collisions;