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'use strict';
// combine 2 matrixes
// m1, m2 - [a, b, c, d, e, g]
//
function combine(m1, m2) {
return [
m1[0] * m2[0] + m1[2] * m2[1],
m1[1] * m2[0] + m1[3] * m2[1],
m1[0] * m2[2] + m1[2] * m2[3],
m1[1] * m2[2] + m1[3] * m2[3],
m1[0] * m2[4] + m1[2] * m2[5] + m1[4],
m1[1] * m2[4] + m1[3] * m2[5] + m1[5]
];
}
function Matrix() {
if (!(this instanceof Matrix)) { return new Matrix(); }
this.queue = []; // list of matrixes to apply
this.cache = null; // combined matrix cache
}
Matrix.prototype.matrix = function (m) {
if (m[0] === 1 && m[1] === 0 && m[2] === 0 && m[3] === 1 && m[4] === 0 && m[5] === 0) {
return this;
}
this.cache = null;
this.queue.push(m);
return this;
};
Matrix.prototype.translate = function (tx, ty) {
if (tx !== 0 || ty !== 0) {
this.cache = null;
this.queue.push([ 1, 0, 0, 1, tx, ty ]);
}
return this;
};
Matrix.prototype.scale = function (sx, sy) {
if (sx !== 1 || sy !== 1) {
this.cache = null;
this.queue.push([ sx, 0, 0, sy, 0, 0 ]);
}
return this;
};
Matrix.prototype.rotate = function (angle, rx, ry) {
var rad, cos, sin;
if (angle !== 0) {
this.translate(rx, ry);
rad = angle * Math.PI / 180;
cos = Math.cos(rad);
sin = Math.sin(rad);
this.queue.push([ cos, sin, -sin, cos, 0, 0 ]);
this.cache = null;
this.translate(-rx, -ry);
}
return this;
};
Matrix.prototype.skewX = function (angle) {
if (angle !== 0) {
this.cache = null;
this.queue.push([ 1, 0, Math.tan(angle * Math.PI / 180), 1, 0, 0 ]);
}
return this;
};
Matrix.prototype.skewY = function (angle) {
if (angle !== 0) {
this.cache = null;
this.queue.push([ 1, Math.tan(angle * Math.PI / 180), 0, 1, 0, 0 ]);
}
return this;
};
// Flatten queue
//
Matrix.prototype.toArray = function () {
if (this.cache) {
return this.cache;
}
if (!this.queue.length) {
this.cache = [ 1, 0, 0, 1, 0, 0 ];
return this.cache;
}
this.cache = this.queue[0];
if (this.queue.length === 1) {
return this.cache;
}
for (var i = 1; i < this.queue.length; i++) {
this.cache = combine(this.cache, this.queue[i]);
}
return this.cache;
};
// Apply list of matrixes to (x,y) point.
// If `isRelative` set, `translate` component of matrix will be skipped
//
Matrix.prototype.calc = function (x, y, isRelative) {
var m;
// Don't change point on empty transforms queue
if (!this.queue.length) { return [ x, y ]; }
// Calculate final matrix, if not exists
//
// NB. if you deside to apply transforms to point one-by-one,
// they should be taken in reverse order
if (!this.cache) {
this.cache = this.toArray();
}
m = this.cache;
// Apply matrix to point
return [
x * m[0] + y * m[2] + (isRelative ? 0 : m[4]),
x * m[1] + y * m[3] + (isRelative ? 0 : m[5])
];
};
module.exports = Matrix;