odin
Version:
Node.js Canvas/WebGL Javascript Game Framework
500 lines (412 loc) • 11.6 kB
JavaScript
if (typeof(define) !== "function") {
var define = require("amdefine")(module);
}
define([
"odin/math/mathf"
],
function(Mathf) {
"use strict";
var cos = Math.cos,
sin = Math.sin,
atan2 = Math.atan2;
/**
* @class Mat2
* 2x2 matrix
* @param Number m11
* @param Number m12
* @param Number m21
* @param Number m22
*/
function Mat2(m11, m12, m21, m22) {
var te = new Float32Array(4);
/**
* @property Float32Array elements
* @memberof Odin.Mat2
*/
this.elements = te;
te[0] = m11 !== undefined ? m11 : 1;
te[2] = m12 || 0;
te[1] = m21 || 0;
te[3] = m22 !== undefined ? m22 : 1;
}
Mathf._classes["Mat2"] = Mat2;
/**
* @method clone
* @memberof Odin.Mat2
* returns new instance of this
* @return Mat2
*/
Mat2.prototype.clone = function() {
var te = this.elements;
return new Mat2(
te[0], te[1],
te[2], te[3]
);
};
/**
* @method copy
* @memberof Odin.Mat2
* copies other
* @param Mat2 other
* @return this
*/
Mat2.prototype.copy = function(other) {
var te = this.elements,
me = other.elements;
te[0] = me[0];
te[1] = me[1];
te[2] = me[2];
te[3] = me[3];
return this;
};
/**
* @method set
* @memberof Odin.Mat2
* sets values of this
* @param Number m11
* @param Number m12
* @param Number m21
* @param Number m22
* @return this
*/
Mat2.prototype.set = function(m11, m12, m21, m22) {
var te = this.elements;
te[0] = m11;
te[2] = m12;
te[1] = m21;
te[3] = m22;
return this;
};
/**
* @method mul
* @memberof Odin.Mat2
* muliples this's values by other's
* @param Mat2 other
* @return this
*/
Mat2.prototype.mul = function(other) {
var ae = this.elements,
be = other.elements,
a11 = ae[0],
a12 = ae[2],
a21 = ae[1],
a22 = ae[3],
b11 = be[0],
b12 = be[2],
b21 = be[1],
b22 = be[3];
ae[0] = a11 * b11 + a21 * b12;
ae[1] = a12 * b11 + a22 * b12;
ae[2] = a11 * b21 + a21 * b22;
ae[3] = a12 * b21 + a22 * b22;
return this;
};
/**
* @method mmul
* @memberof Odin.Mat2
* muliples a and b saves it in this
* @param Mat2 a
* @param Mat2 b
* @return this
*/
Mat2.prototype.mmul = function(a, b) {
var te = this.elements,
ae = a.elements,
be = b.elements,
a11 = ae[0],
a12 = ae[2],
a21 = ae[1],
a22 = ae[3],
b11 = be[0],
b12 = be[2],
b21 = be[1],
b22 = be[3];
te[0] = a11 * b11 + a21 * b12;
te[1] = a12 * b11 + a22 * b12;
te[2] = a11 * b21 + a21 * b22;
te[3] = a12 * b21 + a22 * b22;
return this;
};
/**
* @method smul
* @memberof Odin.Mat2
* muliples this by a scalar value
* @param Number s
* @return this
*/
Mat2.prototype.smul = function(s) {
var te = this.elements;
te[0] *= s;
te[1] *= s;
te[2] *= s;
te[3] *= s;
return this;
};
/**
* @method sdiv
* @memberof Odin.Mat2
* divides this by scalar value
* @param Number s
* @return this
*/
Mat2.prototype.sdiv = function(s) {
var te = this.elements;
s = s !== 0 ? 1 / s : 1;
te[0] *= s;
te[1] *= s;
te[2] *= s;
te[3] *= s;
return this;
};
/**
* @method identity
* @memberof Odin.Mat2
* identity matrix
* @return this
*/
Mat2.prototype.identity = function() {
var te = this.elements;
te[0] = 1;
te[1] = 0;
te[2] = 0;
te[3] = 1;
return this;
};
/**
* @method zero
* @memberof Odin.Mat2
* zero matrix
* @return this
*/
Mat2.prototype.zero = function() {
var te = this.elements;
te[0] = 0;
te[1] = 0;
te[2] = 0;
te[3] = 0;
return this;
};
/**
* @method determinant
* @memberof Odin.Mat2
* returns the determinant of this
* @return this
*/
Mat2.prototype.determinant = function() {
var te = this.elements;
return te[0] * te[3] - te[2] * te[1];
};
/**
* @method inverse
* @memberof Odin.Mat2
* returns the inverse of this
* @return this
*/
Mat2.prototype.inverse = function() {
var te = this.elements,
m11 = te[0],
m12 = te[2],
m21 = te[1],
m22 = te[3],
det = m11 * m22 - m12 * m21;
det = det !== 0 ? 1 / det : 0;
te[0] = m22 * det;
te[1] = -m12 * det;
te[2] = -m21 * det;
te[3] = m11 * det;
return this;
};
/**
* @method inverseMat
* @memberof Odin.Mat2
* returns the inverse of other
* @param Mat2 other
* @return this
*/
Mat2.prototype.inverseMat = function(other) {
var te = this.elements,
me = other.elements,
m11 = me[0],
m12 = me[2],
m21 = me[1],
m22 = me[3],
det = m11 * m22 - m12 * m21;
det = det !== 0 ? 1 / det : 0;
te[0] = m22 * det;
te[1] = -m12 * det;
te[2] = -m21 * det;
te[3] = m11 * det;
return this;
};
/**
* @method transpose
* @memberof Odin.Mat2
* transposes this matrix
* @return this
*/
Mat2.prototype.transpose = function() {
var te = this.elements,
tmp;
tmp = te[1];
te[1] = te[2];
te[2] = tmp;
return this;
};
/**
* @method setTrace
* @memberof Odin.Mat2
* sets the diagonal of matrix
* @param Number x
* @param Number y
* @return this
*/
Mat2.prototype.setTrace = function(x, y) {
var te = this.elements;
te[0] = x;
te[3] = y;
return this;
};
/**
* @method setRotation
* @memberof Odin.Mat2
* sets the rotation in radians this
* @param Number angle
* @return this
*/
Mat2.prototype.setRotation = function(angle) {
var te = this.elements,
c = cos(angle),
s = sin(angle);
te[0] = c;
te[1] = s;
te[2] = -s;
te[3] = c;
return this;
};
/**
* @method getRotation
* @memberof Odin.Mat2
* returns the rotation in radians of this
* @return Number
*/
Mat2.prototype.getRotation = function() {
var te = this.elements;
return atan2(te[1], te[0]);
};
/**
* @method rotate
* @memberof Odin.Mat2
* rotates this by angle in radians
* @param Number angle
* @return this
*/
Mat2.prototype.rotate = function(angle) {
var te = this.elements,
m11 = te[0],
m12 = te[2],
m21 = te[1],
m22 = te[3],
s = sin(angle),
c = sin(angle);
te[0] = m11 * c + m12 * s;
te[1] = m11 * -s + m12 * c;
te[2] = m21 * c + m22 * s;
te[3] = m21 * -s + m22 * c;
return this;
};
/**
* @method fromMat3
* @memberof Odin.Mat2
* sets this from Mat3
* @param Mat3 m
* @return this
*/
Mat2.prototype.fromMat3 = function(m) {
var te = this.elements,
me = m.elements;
te[0] = me[0];
te[1] = me[1];
te[2] = me[3];
te[3] = me[4];
return this;
};
/**
* @method fromMat4
* @memberof Odin.Mat2
* sets this from Mat4
* @param Mat4 m
* @return this
*/
Mat2.prototype.fromMat4 = function(m) {
var te = this.elements,
me = m.elements;
te[0] = me[0];
te[1] = me[1];
te[2] = me[4];
te[3] = me[5];
return this;
};
/**
* @memberof Odin.Mat2
* @param Odin.Mat2 other
* @return this
*/
Mat2.prototype.equals = function(other) {
var ae = this.elements,
be = other.elements;
return !(
ae[0] !== be[0] ||
ae[1] !== be[1] ||
ae[2] !== be[2] ||
ae[3] !== be[3]
);
};
/**
* @method fromJSON
* @memberof Odin.Mat2
* sets values from JSON object
* @param Object json
* @return this
*/
Mat2.prototype.fromJSON = function(json) {
var te = this.elements,
me = json.elements;
te[0] = me[0];
te[1] = me[1];
te[2] = me[2];
te[3] = me[3];
return this;
};
/**
* @method toJSON
* @memberof Odin.Mat2
* returns json object of this
* @return Object
*/
Mat2.prototype.toJSON = function(json) {
json || (json = {});
var te = this.elements,
je = json.elements || (json.elements = []);
json._className = "Mat2";
je[0] = te[0];
je[1] = te[1];
je[2] = te[2];
je[3] = te[3];
return json;
};
/**
* @method toString
* @memberof Odin.Mat2
* returns string of this
* @return String
*/
Mat2.prototype.toString = function() {
var te = this.elements;
return (
"Mat2[ " + te[0] + ", " + te[2] + "]\n" +
" [ " + te[1] + ", " + te[3] + "]"
);
};
return Mat2;
}
);