source: other-projects/playing-in-the-street/summer-2013/trunk/Playing-in-the-Street-WPF/Content/Web/mrdoob-three.js-4862f5f/src/extras/curves/LineCurve.js@ 28897

/**************************************************************
 *  Line
 **************************************************************/

THREE.LineCurve = function ( v1, v2 ) {

    this.v1 = v1;
    this.v2 = v2;

};

THREE.LineCurve.prototype = Object.create( THREE.Curve.prototype );

THREE.LineCurve.prototype.getPoint = function ( t ) {

    var point = this.v2.clone().sub(this.v1);
    point.multiplyScalar( t ).add( this.v1 );

    return point;

};

// Line curve is linear, so we can overwrite default getPointAt

THREE.LineCurve.prototype.getPointAt = function ( u ) {

    return this.getPoint( u );

};

THREE.LineCurve.prototype.getTangent = function( t ) {

    var tangent = this.v2.clone().sub(this.v1);

    return tangent.normalize();

};