Vector3D.jsx

#include Matrix.jsx

Vector3D = function(x, y, z){

    if ( !(this instanceof arguments.callee) ) {
        return new Vector3D(x, y, z);
    }

    Matrix.apply(this, [[x],[y],[z],[1]]);
    this.x = x;
    this.y = y;
    this.z = z;
    if(this.rows != 4 || this.columns != 1){
        throw new Error("Error: a 3D Vector must have 3 coordinates");
    }
    
    return this;
}

Vector3D.prototype = new Matrix(true);

Vector3D.prototype.clone = function(){
     return new Vector3D(this.x, this.y, this.z);
}

Vector3D.prototype.setX = function(val){
    this.x = val;
    this[0][0] = val;
    return this;
}

Vector3D.prototype.setY = function(val){
    this.y = val;
    this[1][0] = val;   
    return this;
}

Vector3D.prototype.setZ = function(val){
    this.z = val;
    this[2][0] = val;
    return this;
}


Vector3D.prototype.toVector2D = function(){
    return new Vector2D(x, y);
}

Vector3D.prototype.apply3DMatrix = function(m3){
    var result = m3 * this;

    return new Vector3D(result[0][0], result[1][0], result[2][0]);
}

Vector3D.prototype["-"] = function(other){
        return new Vector3D(this.x - other.x, this.y - other.y, this.z - other.z);
}