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Code Issues Wiki Activity

Algorithm optimization of Pair methods create and update

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This commit is contained in:
Brice Chevalier 2017-11-24 10:41:18 +09:00
parent 0895d81fa1
commit 6931276cab
4 changed files with 38 additions and 76 deletions
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38
src/collision/Contact.js
View file

@ -1,38 +0,0 @@
/**
* The `Matter.Contact` module contains methods for creating and manipulating collision contacts.
*
* @class Contact
*/
var Contact = {};
module.exports = Contact;
(function() {
/**
* Creates a new contact.
* @method create
* @param {vertex} vertex
* @return {contact} A new contact
*/
Contact.create = function(vertex) {
return {
id: Contact.id(vertex),
vertex: vertex,
normalImpulse: 0,
tangentImpulse: 0
};
};
/**
* Generates a contact id.
* @method id
* @param {vertex} vertex
* @return {string} Unique contactID
*/
Contact.id = function(vertex) {
return vertex.body.id + '_' + vertex.index;
};
})();

64
src/collision/Pair.js
View file

@ -8,8 +8,6 @@ var Pair = {};
module.exports = Pair;
var Contact = require('./Contact');
(function() {
/**
@ -21,26 +19,24 @@ var Contact = require('./Contact');
*/
Pair.create = function(collision, timestamp) {
var bodyA = collision.bodyA,
bodyB = collision.bodyB,
parentA = collision.parentA,
parentB = collision.parentB;
bodyB = collision.bodyB;
var pair = {
id: Pair.id(bodyA, bodyB),
bodyA: bodyA,
bodyB: bodyB,
contacts: {},
activeContacts: [],
separation: 0,
isActive: true,
isSensor: bodyA.isSensor || bodyB.isSensor,
timeCreated: timestamp,
timeUpdated: timestamp,
inverseMass: parentA.inverseMass + parentB.inverseMass,
friction: Math.min(parentA.friction, parentB.friction),
frictionStatic: Math.max(parentA.frictionStatic, parentB.frictionStatic),
restitution: Math.max(parentA.restitution, parentB.restitution),
slop: Math.max(parentA.slop, parentB.slop)
collision: null,
inverseMass: 0,
friction: 0,
frictionStatic: 0,
restitution: 0,
slop: 0
};
Pair.update(pair, collision, timestamp);
@ -56,31 +52,29 @@ var Contact = require('./Contact');
* @param {number} timestamp
*/
Pair.update = function(pair, collision, timestamp) {
var contacts = pair.contacts,
supports = collision.supports,
activeContacts = pair.activeContacts,
parentA = collision.parentA,
parentB = collision.parentB;
pair.collision = collision;
pair.inverseMass = parentA.inverseMass + parentB.inverseMass;
pair.friction = Math.min(parentA.friction, parentB.friction);
pair.frictionStatic = Math.max(parentA.frictionStatic, parentB.frictionStatic);
pair.restitution = Math.max(parentA.restitution, parentB.restitution);
pair.slop = Math.max(parentA.slop, parentB.slop);
activeContacts.length = 0;
if (collision.collided) {
for (var i = 0; i < supports.length; i++) {
var support = supports[i],
contactId = Contact.id(support),
contact = contacts[contactId];
if (contact) {
activeContacts.push(contact);
} else {
activeContacts.push(contacts[contactId] = Contact.create(support));
}
if (collision.collided) {
var supports = collision.supports,
activeContacts = pair.activeContacts;
parentA = collision.parentA,
parentB = collision.parentB;
pair.inverseMass = parentA.inverseMass + parentB.inverseMass;
pair.friction = Math.min(parentA.friction, parentB.friction);
pair.frictionStatic = Math.max(parentA.frictionStatic, parentB.frictionStatic);
pair.restitution = Math.max(parentA.restitution, parentB.restitution);
pair.slop = Math.max(parentA.slop, parentB.slop);
for (var i = 0; i < supports.length; i++) {
activeContacts[i] = supports[i].contact;
}
// Optimizing out resizing of the array
// Most likely unnecessary
var supportCount = supports.length;
if (supportCount < activeContacts.length) {
activeContacts.length = supportCount;
}
pair.separation = collision.depth;
@ -123,4 +117,4 @@ var Contact = require('./Contact');
}
};
})();
})();

11
src/geometry/Vertices.js
View file

@ -44,9 +44,16 @@ var Common = require('../core/Common');
y: point.y,
index: i,
body: body,
isInternal: false
isInternal: false,
contact: null
};
vertex.contact = {
vertex: vertex,
normalImpulse: 0,
tangentImpulse: 0
};
vertices.push(vertex);
}
@ -443,4 +450,4 @@ var Common = require('../core/Common');
return upper.concat(lower);
};
})();
})();

1
src/module/main.js
View file

@ -4,7 +4,6 @@ Matter.Body = require('../body/Body');
Matter.Composite = require('../body/Composite');
Matter.World = require('../body/World');
Matter.Contact = require('../collision/Contact');
Matter.Detector = require('../collision/Detector');
Matter.Grid = require('../collision/Grid');
Matter.Pairs = require('../collision/Pairs');