git.iko.soy/elk
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elk/libraries/Native/Transform2D.js
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2Elm.Native.Transform2D = {};
3Elm.Native.Transform2D.make = function(elm) {
5 elm.Native = elm.Native || {};
6 if (elm.Native.Transform2D) return elm.Native.Transform2D;
8 var A;
9 if (typeof Float32Array === 'undefined') {
10 A = function(arr) {
11 this.length = arr.length;
12 this[0] = arr[0];
13 this[1] = arr[1];
14 this[2] = arr[2];
15 this[3] = arr[3];
16 this[4] = arr[4];
17 this[5] = arr[5];
18 };
19 } else {
20 A = Float32Array;
21 }
23 // layout of matrix in an array is
24 //
25 // | m11 m12 dx |
26 // | m21 m22 dy |
27 // | 0 0 1 |
28 //
29 // new A([ m11, m12, dx, m21, m22, dy ])
31 var identity = new A([1,0,0,0,1,0]);
32 function matrix(m11, m12, m21, m22, dx, dy) {
33 return new A([m11, m12, dx, m21, m22, dy]);
34 }
35 function rotation(t) {
36 var c = Math.cos(t);
37 var s = Math.sin(t);
38 return new A([c, -s, 0, s, c, 0]);
39 }
41 function rotate(t,m) {
42 var c = Math.cos(t);
43 var s = Math.sin(t);
44 var m11 = m[0], m12 = m[1], m21 = m[3], m22 = m[4];
45 return new A([m11*c + m12*s, -m11*s + m12*c, m[2],
46 m21*c + m22*s, -m21*s + m22*c, m[5]]);
47 }
48 /*
49 function move(xy,m) {
50 var x = xy._0;
51 var y = xy._1;
52 var m11 = m[0], m12 = m[1], m21 = m[3], m22 = m[4];
53 return new A([m11, m12, m11*x + m12*y + m[2],
54 m21, m22, m21*x + m22*y + m[5]]);
55 }
56 function scale(s,m) { return new A([m[0]*s, m[1]*s, m[2], m[3]*s, m[4]*s, m[5]]); }
57 function scaleX(x,m) { return new A([m[0]*x, m[1], m[2], m[3]*x, m[4], m[5]]); }
58 function scaleY(y,m) { return new A([m[0], m[1]*y, m[2], m[3], m[4]*y, m[5]]); }
59 function reflectX(m) { return new A([-m[0], m[1], m[2], -m[3], m[4], m[5]]); }
60 function reflectY(m) { return new A([m[0], -m[1], m[2], m[3], -m[4], m[5]]); }
62 function transform(m11, m21, m12, m22, mdx, mdy, n) {
63 var n11 = n[0], n12 = n[1], n21 = n[3], n22 = n[4], ndx = n[2], ndy = n[5];
64 return new A([m11*n11 + m12*n21,
65 m11*n12 + m12*n22,
66 m11*ndx + m12*ndy + mdx,
67 m21*n11 + m22*n21,
68 m21*n12 + m22*n22,
69 m21*ndx + m22*ndy + mdy]);
70 }
71 */
72 function multiply(m, n) {
73 var m11 = m[0], m12 = m[1], m21 = m[3], m22 = m[4], mdx = m[2], mdy = m[5];
74 var n11 = n[0], n12 = n[1], n21 = n[3], n22 = n[4], ndx = n[2], ndy = n[5];
75 return new A([m11*n11 + m12*n21,
76 m11*n12 + m12*n22,
77 m11*ndx + m12*ndy + mdx,
78 m21*n11 + m22*n21,
79 m21*n12 + m22*n22,
80 m21*ndx + m22*ndy + mdy]);
81 }
83 return elm.Native.Transform2D = {
84 identity:identity,
85 matrix:F6(matrix),
86 rotation:rotation,
87 multiply:F2(multiply)
88 /*
89 transform:F7(transform),
90 rotate:F2(rotate),
91 move:F2(move),
92 scale:F2(scale),
93 scaleX:F2(scaleX),
94 scaleY:F2(scaleY),
95 reflectX:reflectX,
96 reflectY:reflectY
97 */
98 };
100};