100 lines
2.3 KiB
JavaScript
100 lines
2.3 KiB
JavaScript
export function create() {
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return [1, 0, 0, 1, 0, 0];
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}
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export function identity(out) {
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out[0] = 1;
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out[1] = 0;
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out[2] = 0;
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out[3] = 1;
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out[4] = 0;
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out[5] = 0;
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return out;
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}
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export function copy(out, m) {
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out[0] = m[0];
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out[1] = m[1];
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out[2] = m[2];
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out[3] = m[3];
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out[4] = m[4];
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out[5] = m[5];
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return out;
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}
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export function mul(out, m1, m2) {
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var out0 = m1[0] * m2[0] + m1[2] * m2[1];
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var out1 = m1[1] * m2[0] + m1[3] * m2[1];
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var out2 = m1[0] * m2[2] + m1[2] * m2[3];
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var out3 = m1[1] * m2[2] + m1[3] * m2[3];
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var out4 = m1[0] * m2[4] + m1[2] * m2[5] + m1[4];
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var out5 = m1[1] * m2[4] + m1[3] * m2[5] + m1[5];
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out[0] = out0;
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out[1] = out1;
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out[2] = out2;
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out[3] = out3;
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out[4] = out4;
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out[5] = out5;
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return out;
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}
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export function translate(out, a, v) {
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out[0] = a[0];
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out[1] = a[1];
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out[2] = a[2];
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out[3] = a[3];
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out[4] = a[4] + v[0];
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out[5] = a[5] + v[1];
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return out;
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}
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export function rotate(out, a, rad, pivot) {
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if (pivot === void 0) { pivot = [0, 0]; }
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var aa = a[0];
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var ac = a[2];
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var atx = a[4];
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var ab = a[1];
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var ad = a[3];
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var aty = a[5];
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var st = Math.sin(rad);
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var ct = Math.cos(rad);
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out[0] = aa * ct + ab * st;
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out[1] = -aa * st + ab * ct;
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out[2] = ac * ct + ad * st;
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out[3] = -ac * st + ct * ad;
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out[4] = ct * (atx - pivot[0]) + st * (aty - pivot[1]) + pivot[0];
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out[5] = ct * (aty - pivot[1]) - st * (atx - pivot[0]) + pivot[1];
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return out;
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}
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export function scale(out, a, v) {
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var vx = v[0];
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var vy = v[1];
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out[0] = a[0] * vx;
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out[1] = a[1] * vy;
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out[2] = a[2] * vx;
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out[3] = a[3] * vy;
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out[4] = a[4] * vx;
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out[5] = a[5] * vy;
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return out;
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}
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export function invert(out, a) {
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var aa = a[0];
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var ac = a[2];
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var atx = a[4];
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var ab = a[1];
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var ad = a[3];
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var aty = a[5];
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var det = aa * ad - ab * ac;
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if (!det) {
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return null;
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}
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det = 1.0 / det;
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out[0] = ad * det;
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out[1] = -ab * det;
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out[2] = -ac * det;
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out[3] = aa * det;
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out[4] = (ac * aty - ad * atx) * det;
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out[5] = (ab * atx - aa * aty) * det;
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return out;
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}
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export function clone(a) {
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var b = create();
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copy(b, a);
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return b;
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}
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