| 1 | 'use strict';
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| 2 |
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| 3 | // TODO implement as separate plugin
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| 4 |
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| 5 | const {
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| 6 | transformsMultiply,
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| 7 | transform2js,
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| 8 | transformArc,
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| 9 | } = require('./_transforms.js');
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| 10 | const { removeLeadingZero } = require('../lib/svgo/tools.js');
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| 11 | const { referencesProps, attrsGroupsDefaults } = require('./_collections.js');
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| 12 |
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| 13 | const regNumericValues = /[-+]?(\d*\.\d+|\d+\.?)(?:[eE][-+]?\d+)?/g;
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| 14 | const defaultStrokeWidth = attrsGroupsDefaults.presentation['stroke-width'];
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| 15 |
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| 16 | /**
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| 17 | * Apply transformation(s) to the Path data.
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| 18 | *
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| 19 | * @param {Object} elem current element
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| 20 | * @param {Array} path input path data
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| 21 | * @param {Object} params whether to apply transforms to stroked lines and transform precision (used for stroke width)
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| 22 | * @return {Array} output path data
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| 23 | */
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| 24 | const applyTransforms = (elem, pathData, params) => {
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| 25 | // if there are no 'stroke' attr and references to other objects such as
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| 26 | // gradiends or clip-path which are also subjects to transform.
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| 27 | if (
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| 28 | elem.attributes.transform == null ||
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| 29 | elem.attributes.transform === '' ||
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| 30 | // styles are not considered when applying transform
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| 31 | // can be fixed properly with new style engine
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| 32 | elem.attributes.style != null ||
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| 33 | Object.entries(elem.attributes).some(
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| 34 | ([name, value]) =>
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| 35 | referencesProps.includes(name) && value.includes('url(')
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| 36 | )
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| 37 | ) {
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| 38 | return;
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| 39 | }
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| 40 |
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| 41 | const matrix = transformsMultiply(transform2js(elem.attributes.transform));
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| 42 | const stroke = elem.computedAttr('stroke');
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| 43 | const id = elem.computedAttr('id');
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| 44 | const transformPrecision = params.transformPrecision;
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| 45 |
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| 46 | if (stroke && stroke != 'none') {
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| 47 | if (
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| 48 | !params.applyTransformsStroked ||
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| 49 | ((matrix.data[0] != matrix.data[3] ||
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| 50 | matrix.data[1] != -matrix.data[2]) &&
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| 51 | (matrix.data[0] != -matrix.data[3] || matrix.data[1] != matrix.data[2]))
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| 52 | )
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| 53 | return;
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| 54 |
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| 55 | // "stroke-width" should be inside the part with ID, otherwise it can be overrided in <use>
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| 56 | if (id) {
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| 57 | let idElem = elem;
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| 58 | let hasStrokeWidth = false;
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| 59 |
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| 60 | do {
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| 61 | if (idElem.attributes['stroke-width']) {
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| 62 | hasStrokeWidth = true;
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| 63 | }
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| 64 | } while (
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| 65 | idElem.attributes.id !== id &&
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| 66 | !hasStrokeWidth &&
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| 67 | (idElem = idElem.parentNode)
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| 68 | );
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| 69 |
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| 70 | if (!hasStrokeWidth) return;
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| 71 | }
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| 72 |
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| 73 | const scale = +Math.sqrt(
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| 74 | matrix.data[0] * matrix.data[0] + matrix.data[1] * matrix.data[1]
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| 75 | ).toFixed(transformPrecision);
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| 76 |
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| 77 | if (scale !== 1) {
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| 78 | const strokeWidth =
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| 79 | elem.computedAttr('stroke-width') || defaultStrokeWidth;
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| 80 |
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| 81 | if (
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| 82 | elem.attributes['vector-effect'] == null ||
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| 83 | elem.attributes['vector-effect'] !== 'non-scaling-stroke'
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| 84 | ) {
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| 85 | if (elem.attributes['stroke-width'] != null) {
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| 86 | elem.attributes['stroke-width'] = elem.attributes['stroke-width']
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| 87 | .trim()
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| 88 | .replace(regNumericValues, (num) => removeLeadingZero(num * scale));
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| 89 | } else {
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| 90 | elem.attributes['stroke-width'] = strokeWidth.replace(
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| 91 | regNumericValues,
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| 92 | (num) => removeLeadingZero(num * scale)
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| 93 | );
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| 94 | }
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| 95 |
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| 96 | if (elem.attributes['stroke-dashoffset'] != null) {
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| 97 | elem.attributes['stroke-dashoffset'] = elem.attributes[
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| 98 | 'stroke-dashoffset'
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| 99 | ]
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| 100 | .trim()
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| 101 | .replace(regNumericValues, (num) => removeLeadingZero(num * scale));
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| 102 | }
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| 103 |
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| 104 | if (elem.attributes['stroke-dasharray'] != null) {
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| 105 | elem.attributes['stroke-dasharray'] = elem.attributes[
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| 106 | 'stroke-dasharray'
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| 107 | ]
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| 108 | .trim()
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| 109 | .replace(regNumericValues, (num) => removeLeadingZero(num * scale));
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| 110 | }
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| 111 | }
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| 112 | }
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| 113 | } else if (id) {
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| 114 | // Stroke and stroke-width can be redefined with <use>
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| 115 | return;
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| 116 | }
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| 117 |
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| 118 | applyMatrixToPathData(pathData, matrix.data);
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| 119 |
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| 120 | // remove transform attr
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| 121 | delete elem.attributes.transform;
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| 122 |
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| 123 | return;
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| 124 | };
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| 125 | exports.applyTransforms = applyTransforms;
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| 126 |
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| 127 | const transformAbsolutePoint = (matrix, x, y) => {
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| 128 | const newX = matrix[0] * x + matrix[2] * y + matrix[4];
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| 129 | const newY = matrix[1] * x + matrix[3] * y + matrix[5];
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| 130 | return [newX, newY];
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| 131 | };
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| 132 |
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| 133 | const transformRelativePoint = (matrix, x, y) => {
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| 134 | const newX = matrix[0] * x + matrix[2] * y;
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| 135 | const newY = matrix[1] * x + matrix[3] * y;
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| 136 | return [newX, newY];
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| 137 | };
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| 138 |
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| 139 | const applyMatrixToPathData = (pathData, matrix) => {
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| 140 | const start = [0, 0];
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| 141 | const cursor = [0, 0];
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| 142 |
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| 143 | for (const pathItem of pathData) {
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| 144 | let { command, args } = pathItem;
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| 145 |
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| 146 | // moveto (x y)
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| 147 | if (command === 'M') {
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| 148 | cursor[0] = args[0];
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| 149 | cursor[1] = args[1];
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| 150 | start[0] = cursor[0];
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| 151 | start[1] = cursor[1];
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| 152 | const [x, y] = transformAbsolutePoint(matrix, args[0], args[1]);
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| 153 | args[0] = x;
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| 154 | args[1] = y;
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| 155 | }
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| 156 | if (command === 'm') {
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| 157 | cursor[0] += args[0];
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| 158 | cursor[1] += args[1];
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| 159 | start[0] = cursor[0];
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| 160 | start[1] = cursor[1];
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| 161 | const [x, y] = transformRelativePoint(matrix, args[0], args[1]);
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| 162 | args[0] = x;
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| 163 | args[1] = y;
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| 164 | }
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| 165 |
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| 166 | // horizontal lineto (x)
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| 167 | // convert to lineto to handle two-dimentional transforms
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| 168 | if (command === 'H') {
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| 169 | command = 'L';
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| 170 | args = [args[0], cursor[1]];
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| 171 | }
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| 172 | if (command === 'h') {
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| 173 | command = 'l';
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| 174 | args = [args[0], 0];
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| 175 | }
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| 176 |
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| 177 | // vertical lineto (y)
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| 178 | // convert to lineto to handle two-dimentional transforms
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| 179 | if (command === 'V') {
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| 180 | command = 'L';
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| 181 | args = [cursor[0], args[0]];
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| 182 | }
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| 183 | if (command === 'v') {
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| 184 | command = 'l';
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| 185 | args = [0, args[0]];
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| 186 | }
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| 187 |
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| 188 | // lineto (x y)
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| 189 | if (command === 'L') {
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| 190 | cursor[0] = args[0];
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| 191 | cursor[1] = args[1];
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| 192 | const [x, y] = transformAbsolutePoint(matrix, args[0], args[1]);
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| 193 | args[0] = x;
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| 194 | args[1] = y;
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| 195 | }
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| 196 | if (command === 'l') {
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| 197 | cursor[0] += args[0];
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| 198 | cursor[1] += args[1];
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| 199 | const [x, y] = transformRelativePoint(matrix, args[0], args[1]);
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| 200 | args[0] = x;
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| 201 | args[1] = y;
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| 202 | }
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| 203 |
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| 204 | // curveto (x1 y1 x2 y2 x y)
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| 205 | if (command === 'C') {
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| 206 | cursor[0] = args[4];
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| 207 | cursor[1] = args[5];
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| 208 | const [x1, y1] = transformAbsolutePoint(matrix, args[0], args[1]);
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| 209 | const [x2, y2] = transformAbsolutePoint(matrix, args[2], args[3]);
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| 210 | const [x, y] = transformAbsolutePoint(matrix, args[4], args[5]);
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| 211 | args[0] = x1;
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| 212 | args[1] = y1;
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| 213 | args[2] = x2;
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| 214 | args[3] = y2;
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| 215 | args[4] = x;
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| 216 | args[5] = y;
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| 217 | }
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| 218 | if (command === 'c') {
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| 219 | cursor[0] += args[4];
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| 220 | cursor[1] += args[5];
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| 221 | const [x1, y1] = transformRelativePoint(matrix, args[0], args[1]);
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| 222 | const [x2, y2] = transformRelativePoint(matrix, args[2], args[3]);
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| 223 | const [x, y] = transformRelativePoint(matrix, args[4], args[5]);
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| 224 | args[0] = x1;
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| 225 | args[1] = y1;
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| 226 | args[2] = x2;
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| 227 | args[3] = y2;
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| 228 | args[4] = x;
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| 229 | args[5] = y;
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| 230 | }
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| 231 |
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| 232 | // smooth curveto (x2 y2 x y)
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| 233 | if (command === 'S') {
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| 234 | cursor[0] = args[2];
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| 235 | cursor[1] = args[3];
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| 236 | const [x2, y2] = transformAbsolutePoint(matrix, args[0], args[1]);
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| 237 | const [x, y] = transformAbsolutePoint(matrix, args[2], args[3]);
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| 238 | args[0] = x2;
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| 239 | args[1] = y2;
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| 240 | args[2] = x;
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| 241 | args[3] = y;
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| 242 | }
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| 243 | if (command === 's') {
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| 244 | cursor[0] += args[2];
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| 245 | cursor[1] += args[3];
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| 246 | const [x2, y2] = transformRelativePoint(matrix, args[0], args[1]);
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| 247 | const [x, y] = transformRelativePoint(matrix, args[2], args[3]);
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| 248 | args[0] = x2;
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| 249 | args[1] = y2;
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| 250 | args[2] = x;
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| 251 | args[3] = y;
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| 252 | }
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| 253 |
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| 254 | // quadratic Bézier curveto (x1 y1 x y)
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| 255 | if (command === 'Q') {
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| 256 | cursor[0] = args[2];
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| 257 | cursor[1] = args[3];
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| 258 | const [x1, y1] = transformAbsolutePoint(matrix, args[0], args[1]);
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| 259 | const [x, y] = transformAbsolutePoint(matrix, args[2], args[3]);
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| 260 | args[0] = x1;
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| 261 | args[1] = y1;
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| 262 | args[2] = x;
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| 263 | args[3] = y;
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| 264 | }
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| 265 | if (command === 'q') {
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| 266 | cursor[0] += args[2];
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| 267 | cursor[1] += args[3];
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| 268 | const [x1, y1] = transformRelativePoint(matrix, args[0], args[1]);
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| 269 | const [x, y] = transformRelativePoint(matrix, args[2], args[3]);
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| 270 | args[0] = x1;
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| 271 | args[1] = y1;
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| 272 | args[2] = x;
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| 273 | args[3] = y;
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| 274 | }
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| 275 |
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| 276 | // smooth quadratic Bézier curveto (x y)
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| 277 | if (command === 'T') {
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| 278 | cursor[0] = args[0];
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| 279 | cursor[1] = args[1];
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| 280 | const [x, y] = transformAbsolutePoint(matrix, args[0], args[1]);
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| 281 | args[0] = x;
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| 282 | args[1] = y;
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| 283 | }
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| 284 | if (command === 't') {
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| 285 | cursor[0] += args[0];
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| 286 | cursor[1] += args[1];
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| 287 | const [x, y] = transformRelativePoint(matrix, args[0], args[1]);
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| 288 | args[0] = x;
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| 289 | args[1] = y;
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| 290 | }
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| 291 |
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| 292 | // elliptical arc (rx ry x-axis-rotation large-arc-flag sweep-flag x y)
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| 293 | if (command === 'A') {
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| 294 | transformArc(cursor, args, matrix);
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| 295 | cursor[0] = args[5];
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| 296 | cursor[1] = args[6];
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| 297 | // reduce number of digits in rotation angle
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| 298 | if (Math.abs(args[2]) > 80) {
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| 299 | const a = args[0];
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| 300 | const rotation = args[2];
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| 301 | args[0] = args[1];
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| 302 | args[1] = a;
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| 303 | args[2] = rotation + (rotation > 0 ? -90 : 90);
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| 304 | }
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| 305 | const [x, y] = transformAbsolutePoint(matrix, args[5], args[6]);
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| 306 | args[5] = x;
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| 307 | args[6] = y;
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| 308 | }
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| 309 | if (command === 'a') {
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| 310 | transformArc([0, 0], args, matrix);
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| 311 | cursor[0] += args[5];
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| 312 | cursor[1] += args[6];
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| 313 | // reduce number of digits in rotation angle
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| 314 | if (Math.abs(args[2]) > 80) {
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| 315 | const a = args[0];
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| 316 | const rotation = args[2];
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| 317 | args[0] = args[1];
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| 318 | args[1] = a;
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| 319 | args[2] = rotation + (rotation > 0 ? -90 : 90);
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| 320 | }
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| 321 | const [x, y] = transformRelativePoint(matrix, args[5], args[6]);
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| 322 | args[5] = x;
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| 323 | args[6] = y;
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| 324 | }
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| 325 |
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| 326 | // closepath
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| 327 | if (command === 'z' || command === 'Z') {
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| 328 | cursor[0] = start[0];
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| 329 | cursor[1] = start[1];
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| 330 | }
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| 331 |
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| 332 | pathItem.command = command;
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| 333 | pathItem.args = args;
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| 334 | }
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| 335 | };
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