fireball/lib/helpers/RectAreaLightHelper.js

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JavaScript
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2018-12-25 13:59:22 +00:00
/**
* @author abelnation / http://github.com/abelnation
* @author Mugen87 / http://github.com/Mugen87
* @author WestLangley / http://github.com/WestLangley
*/
import { Object3D } from '../core/Object3D.js';
import { Line } from '../objects/Line.js';
import { LineBasicMaterial } from '../materials/LineBasicMaterial.js';
import { BufferGeometry } from '../core/BufferGeometry.js';
import { BufferAttribute } from '../core/BufferAttribute.js';
function RectAreaLightHelper( light, color ) {
Object3D.call( this );
this.light = light;
this.light.updateMatrixWorld();
this.matrix = light.matrixWorld;
this.matrixAutoUpdate = false;
this.color = color;
var material = new LineBasicMaterial( { fog: false } );
var geometry = new BufferGeometry();
geometry.addAttribute( 'position', new BufferAttribute( new Float32Array( 5 * 3 ), 3 ) );
this.line = new Line( geometry, material );
this.add( this.line );
this.update();
}
RectAreaLightHelper.prototype = Object.create( Object3D.prototype );
RectAreaLightHelper.prototype.constructor = RectAreaLightHelper;
RectAreaLightHelper.prototype.dispose = function () {
this.children[ 0 ].geometry.dispose();
this.children[ 0 ].material.dispose();
};
RectAreaLightHelper.prototype.update = function () {
// calculate new dimensions of the helper
var hx = this.light.width * 0.5;
var hy = this.light.height * 0.5;
var position = this.line.geometry.attributes.position;
var array = position.array;
// update vertices
array[ 0 ] = hx; array[ 1 ] = - hy; array[ 2 ] = 0;
array[ 3 ] = hx; array[ 4 ] = hy; array[ 5 ] = 0;
array[ 6 ] = - hx; array[ 7 ] = hy; array[ 8 ] = 0;
array[ 9 ] = - hx; array[ 10 ] = - hy; array[ 11 ] = 0;
array[ 12 ] = hx; array[ 13 ] = - hy; array[ 14 ] = 0;
position.needsUpdate = true;
if ( this.color !== undefined ) {
this.line.material.color.set( this.color );
} else {
this.line.material.color.copy( this.light.color );
}
};
export { RectAreaLightHelper };