git.iko.soy/elk
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elk/libraries/Native/Matrix2D.js
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2Elm.Native.Matrix2D = function(elm) {
3 "use strict";
5 elm.Native = elm.Native || {};
6 if (elm.Native.Matrix2D) return elm.Native.Matrix2D;
8 try { Float32Array; } catch(e) { Float32Array = Array; }
9 var A = Float32Array;
11 // layout of matrix in an array is
12 //
13 // | m11 m12 dx |
14 // | m21 m22 dy |
15 // | 0 0 1 |
16 //
17 // new A([ m11, m12, dx, m21, m22, dy ])
19 var identity = new A([1,0,0,0,1,0]);
20 function matrix(m11, m21, m12, m22, dx, dy) {
21 return new A([m11, m12, dx, m21, m22, dy]);
22 }
24 function rotate(t,m) {
25 var c = Math.cos(t);
26 var s = Math.sin(t);
27 var m11 = m[0], m12 = m[1], m21 = m[3], m22 = m[4];
28 return new A([m11*c + m12*s, -m11*s + m12*c, m[2],
29 m21*c + m22*s, -m21*s + m22*c, m[5]]);
30 }
31 function move(x,y,m) {
32 var m11 = m[0], m12 = m[1], m21 = m[3], m22 = m[4];
33 return new A([m11, m12, m11*x + m12*y + m[2],
34 m21, m22, m21*x + m22*y + m[5]]);
35 }
36 function scale(s,m) { return new A([m[0]*s, m[1]*s, m[2], m[3]*s, m[4]*s, m[5]]); }
37 function scaleX(x,m) { return new A([m[0]*x, m[1], m[2], m[3]*x, m[4], m[5]]); }
38 function scaleY(y,m) { return new A([m[0], m[1]*y, m[2], m[3], m[4]*y, m[5]]); }
39 function reflectX(m) { return new A([-m[0], m[1], m[2], -m[3], m[4], m[5]]); }
40 function reflectY(m) { return new A([m[0], -m[1], m[2], m[3], -m[4], m[5]]); }
42 function transform(m11, m21, m12, m22, mdx, mdy, n) {
43 var n11 = n[0], n12 = n[1], n21 = n[3], n22 = n[4], ndx = n[2], ndy = n[5];
44 return new A([m11*n11 + m12*n21,
45 m11*n12 + m12*n22,
46 m11*ndx + m12*ndy + mdx,
47 m21*n11 + m22*n21,
48 m21*n12 + m22*n22,
49 m21*ndx + m22*ndy + mdy]);
50 }
52 function multiply(m, n) {
53 return transform(m[0], m[3], m[1], m[4], m[2], m[5], n);
54 }
56 return elm.Native.Matrix2D = {
57 identity:identity,
58 matrix:F6(matrix),
59 multiply:F2(multiply),
61 transform:F7(transform),
62 rotate:F2(rotate),
63 move:F3(move),
64 scale:F2(scale),
65 scaleX:F2(scaleX),
66 scaleY:F2(scaleY),
67 reflectX:reflectX,
68 reflectY:reflectY
69 };
71};