TanTan
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75 lines
2.3 KiB
Plaintext
75 lines
2.3 KiB
Plaintext
/**
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* @file 根据transform参数变换轮廓
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* @author mengke01(kekee000@gmail.com)
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*/
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import {mul, multiply} from '../../graphics/matrix';
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import pathTransform from '../../graphics/pathTransform';
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/**
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* 根据transform参数变换轮廓
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*
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* @param {Array} contours 轮廓集合
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* @param {Array} transforms 变换指令集合
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* transforms = [{
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* name: 'scale'
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* params: [3,4]
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* }]
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*
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* @return {Array} 变换后的轮廓数组
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*/
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export default function contoursTransform(contours, transforms) {
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if (!contours || !contours.length || !transforms || !transforms.length) {
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return contours;
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}
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let matrix = [1, 0, 0, 1, 0, 0];
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for (let i = 0, l = transforms.length; i < l; i++) {
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const transform = transforms[i];
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const params = transform.params;
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let radian = null;
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switch (transform.name) {
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case 'translate':
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matrix = mul(matrix, [1, 0, 0, 1, params[0], params[1]]);
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break;
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case 'scale':
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matrix = mul(matrix, [params[0], 0, 0, params[1], 0, 0]);
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break;
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case 'matrix':
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matrix = mul(matrix,
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[params[0], params[1], params[2], params[3], params[4], params[5]]);
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break;
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case 'rotate':
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radian = params[0] * Math.PI / 180;
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if (params.length > 1) {
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matrix = multiply(
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matrix,
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[1, 0, 0, 1, -params[1], -params[2]],
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[Math.cos(radian), Math.sin(radian), -Math.sin(radian), Math.cos(radian), 0, 0],
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[1, 0, 0, 1, params[1], params[2]]
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);
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}
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else {
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matrix = mul(
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matrix, [Math.cos(radian), Math.sin(radian), -Math.sin(radian), Math.cos(radian), 0, 0]);
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}
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break;
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case 'skewX':
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matrix = mul(matrix,
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[1, 0, Math.tan(params[0] * Math.PI / 180), 1, 0, 0]);
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break;
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case 'skewY':
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matrix = mul(matrix,
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[1, Math.tan(params[0] * Math.PI / 180), 0, 1, 0, 0]);
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break;
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}
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}
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contours.forEach(p => {
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pathTransform(p, matrix[0], matrix[1], matrix[2], matrix[3], matrix[4], matrix[5]);
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});
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return contours;
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}
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