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48 lines
1.4 KiB
48 lines
1.4 KiB
4 months ago
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import { mat3 } from 'gl-matrix';
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function leftTranslate(out, a, v) {
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var transMat = [0, 0, 0, 0, 0, 0, 0, 0, 0];
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mat3.fromTranslation(transMat, v);
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return mat3.multiply(out, transMat, a);
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}
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function leftRotate(out, a, rad) {
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var rotateMat = [0, 0, 0, 0, 0, 0, 0, 0, 0];
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mat3.fromRotation(rotateMat, rad);
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return mat3.multiply(out, rotateMat, a);
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}
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function leftScale(out, a, v) {
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var scaleMat = [0, 0, 0, 0, 0, 0, 0, 0, 0];
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mat3.fromScaling(scaleMat, v);
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return mat3.multiply(out, scaleMat, a);
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}
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function leftMultiply(out, a, a1) {
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return mat3.multiply(out, a1, a);
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}
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/**
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* 根据 actions 来做 transform
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* @param m
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* @param actions
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*/
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export function transform(m, actions) {
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var matrix = m ? [].concat(m) : [1, 0, 0, 0, 1, 0, 0, 0, 1];
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for (var i = 0, len = actions.length; i < len; i++) {
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var action = actions[i];
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switch (action[0]) {
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case 't':
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leftTranslate(matrix, matrix, [action[1], action[2]]);
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break;
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case 's':
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leftScale(matrix, matrix, [action[1], action[2]]);
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break;
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case 'r':
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leftRotate(matrix, matrix, action[1]);
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break;
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case 'm':
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leftMultiply(matrix, matrix, action[1]);
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break;
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default:
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break;
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}
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}
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return matrix;
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}
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//# sourceMappingURL=transform.js.map
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