obelisk.js/src/geom/Point3D.js

JavaScript Library for Building Pixel Isometric Element with HTML5 Canvas

/*jslint node: true*/

'use strict';

var Point = require('./Point');

var Point3D, p;
Point3D = function (x, y, z) {
    this.initialize(x, y, z);
};
p = Point3D.prototype;

// public properties
p.x = 0;
p.y = 0;
p.z = 0;

// constructor
p.initialize = function (x, y, z) {
    this.x = (x === undefined ? 0 : x);
    this.y = (y === undefined ? 0 : y);
    this.z = (z === undefined ? 0 : z);

    return this;
};

// public methods
p.toGlobalCoordinates = function (offset) {
    var p2D = new Point(
        this.x - this.y,
        Math.floor(this.x / 2 + this.y / 2) - this.z
    );

    if (offset !== undefined) {
        p2D.x = p2D.x + offset.x;
        p2D.y = p2D.y + offset.y;
    }

    return p2D;
};

p.toString = function () {
    return '[Point3D x : ' + this.x + ', y : ' + this.y + ', z: ' + this.z + ']';
};

module.exports = Point3D;