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Added Camera Hit Test specific cull

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This commit is contained in:
Richard Davey 2017-07-18 02:35:55 +01:00
parent 95dea5c88a
commit 9a34ce71ac
2 changed files with 68 additions and 0 deletions
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1
v3/src/camera/Camera.js
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@ -67,6 +67,7 @@ var Camera = new Class({
centerToBounds: require('./components/CenterToBounds'),
centerToSize: require('./components/CenterToSize'),
cull: require('./components/Cull'),
cullHitTest: require('./components/CullHitTest'),
destroy: require('./components/Destroy'),
fade: require('./components/Fade'),
flash: require('./components/Flash'),

67
v3/src/camera/components/CullHitTest.js Normal file
View file

@ -0,0 +1,67 @@
var CullHitTest = function (interactiveObjects)
{
if (this.disableCull)
{
return interactiveObjects;
}
var cameraMatrix = this.matrix.matrix;
var mva = cameraMatrix[0];
var mvb = cameraMatrix[1];
var mvc = cameraMatrix[2];
var mvd = cameraMatrix[3];
/* First Invert Matrix */
var determinant = (mva * mvd) - (mvb * mvc);
if (!determinant)
{
return interactiveObjects;
}
var mve = cameraMatrix[4];
var mvf = cameraMatrix[5];
var scrollX = this.scrollX;
var scrollY = this.scrollY;
var cameraW = this.width;
var cameraH = this.height;
var length = interactiveObjects.length;
determinant = 1 / determinant;
var culledObjects = [];
for (var index = 0; index < length; ++index)
{
var object = interactiveObjects[index].gameObject;
if (!object.hasOwnProperty('width'))
{
culledObjects.push(interactiveObjects[index]);
continue;
}
var objectW = object.width;
var objectH = object.height;
var objectX = (object.x - (scrollX * object.scrollFactorX)) - (objectW * object.originX);
var objectY = (object.y - (scrollY * object.scrollFactorY)) - (objectH * object.originY);
var tx = (objectX * mva + objectY * mvc + mve);
var ty = (objectX * mvb + objectY * mvd + mvf);
var tw = ((objectX + objectW) * mva + (objectY + objectH) * mvc + mve);
var th = ((objectX + objectW) * mvb + (objectY + objectH) * mvd + mvf);
var cullW = cameraW + objectW;
var cullH = cameraH + objectH;
if (tx > -objectW || ty > -objectH || tx < cullW || ty < cullH ||
tw > -objectW || th > -objectH || tw < cullW || th < cullH)
{
culledObjects.push(interactiveObjects[index]);
}
}
return culledObjects;
};
module.exports = CullHitTest;