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Code Issues Wiki Activity

fixed some issues with engine.timeScale

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This commit is contained in:
liabru 2014-04-24 16:23:23 +01:00
parent 50224c55dc
commit e8dba617de
3 changed files with 13 additions and 6 deletions
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5
src/collision/Resolver.js
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@ -16,8 +16,9 @@ var Resolver = {};
* Description
* @method solvePosition
* @param {pair[]} pairs
* @param {number} timeScale
*/
Resolver.solvePosition = function(pairs) {
Resolver.solvePosition = function(pairs, timeScale) {
var i,
pair,
collision,
@ -59,7 +60,7 @@ var Resolver = {};
bodyA = collision.bodyA;
bodyB = collision.bodyB;
normal = collision.normal;
positionImpulse = (pair.separation * _positionDampen) - pair.slop;
positionImpulse = ((pair.separation * _positionDampen) - pair.slop) * timeScale;
if (bodyA.isStatic || bodyB.isStatic)
positionImpulse *= 2;

12
src/core/Engine.js
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@ -91,7 +91,8 @@ var Engine = {};
correction,
counterTimestamp = 0,
frameCounter = 0,
deltaHistory = [];
deltaHistory = [],
timeScalePrev = 1;
(function render(timestamp){
_requestAnimationFrame(render);
@ -129,9 +130,14 @@ var Engine = {};
delta = delta < engine.timing.deltaMin ? engine.timing.deltaMin : delta;
delta = delta > engine.timing.deltaMax ? engine.timing.deltaMax : delta;
// verlet time correction
// time correction for delta
correction = delta / timing.delta;
// time correction for time scaling
if (timeScalePrev !== 0)
correction *= engine.timeScale / timeScalePrev;
timeScalePrev = engine.timeScale;
// update engine timing object
timing.timestamp = timestamp;
timing.correction = correction;
@ -296,7 +302,7 @@ var Engine = {};
// iteratively resolve position between collisions
for (i = 0; i < engine.positionIterations; i++) {
Resolver.solvePosition(pairs.list);
Resolver.solvePosition(pairs.list, engine.timeScale * engine.timing.correction);
}
Resolver.postSolvePosition(allBodies);

2
src/render/Gui.js
View file

@ -168,7 +168,7 @@ var Gui = {};
Composite.setModified(engine.world, true, false, false);
});
physics.add(engine, 'timeScale', 0.1, 2).step(0.1);
physics.add(engine, 'timeScale', 0, 1.2).step(0.05);
physics.add(engine, 'velocityIterations', 1, 10).step(1);
physics.add(engine, 'positionIterations', 1, 10).step(1);
physics.add(engine, 'enabled');