93 lines
3.0 KiB
TypeScript
93 lines
3.0 KiB
TypeScript
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import { ROTATE, SCALE, SKEW_X, SKEW_Y, iMatrix } from '../constants';
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import { reNum } from './constants';
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import type { TMat2D } from '../typedefs';
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import { cleanupSvgAttribute } from '../util/internals/cleanupSvgAttribute';
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import {
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createRotateMatrix,
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createScaleMatrix,
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createSkewXMatrix,
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createSkewYMatrix,
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createTranslateMatrix,
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multiplyTransformMatrixArray,
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} from '../util/misc/matrix';
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// == begin transform regexp
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const p = `(${reNum})`;
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const skewX = String.raw`(skewX)\(${p}\)`;
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const skewY = String.raw`(skewY)\(${p}\)`;
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const rotate = String.raw`(rotate)\(${p}(?: ${p} ${p})?\)`;
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const scale = String.raw`(scale)\(${p}(?: ${p})?\)`;
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const translate = String.raw`(translate)\(${p}(?: ${p})?\)`;
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const matrix = String.raw`(matrix)\(${p} ${p} ${p} ${p} ${p} ${p}\)`;
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const transform = `(?:${matrix}|${translate}|${rotate}|${scale}|${skewX}|${skewY})`;
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const transforms = `(?:${transform}*)`;
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const transformList = String.raw`^\s*(?:${transforms}?)\s*$`;
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// http://www.w3.org/TR/SVG/coords.html#TransformAttribute
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const reTransformList = new RegExp(transformList);
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const reTransform = new RegExp(transform);
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const reTransformAll = new RegExp(transform, 'g');
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// == end transform regexp
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/**
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* Parses "transform" attribute, returning an array of values
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* @param {String} attributeValue String containing attribute value
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* @return {TTransformMatrix} Array of 6 elements representing transformation matrix
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*/
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export function parseTransformAttribute(attributeValue: string): TMat2D {
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// first we clean the string
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attributeValue = cleanupSvgAttribute(attributeValue)
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// remove spaces around front parentheses
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.replace(/\s*([()])\s*/gi, '$1');
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// start with identity matrix
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const matrices: TMat2D[] = [];
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// return if no argument was given or
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// an argument does not match transform attribute regexp
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if (
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!attributeValue ||
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(attributeValue && !reTransformList.test(attributeValue))
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) {
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return [...iMatrix];
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}
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for (const match of attributeValue.matchAll(reTransformAll)) {
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const transformMatch = reTransform.exec(match[0]);
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if (!transformMatch) {
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continue;
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}
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let matrix: TMat2D = iMatrix;
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const matchedParams = transformMatch.filter((m) => !!m);
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const [, operation, ...rawArgs] = matchedParams;
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const [arg0, arg1, arg2, arg3, arg4, arg5] = rawArgs.map((arg) =>
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parseFloat(arg),
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);
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switch (operation) {
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case 'translate':
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matrix = createTranslateMatrix(arg0, arg1);
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break;
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case ROTATE:
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matrix = createRotateMatrix({ angle: arg0 }, { x: arg1, y: arg2 });
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break;
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case SCALE:
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matrix = createScaleMatrix(arg0, arg1);
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break;
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case SKEW_X:
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matrix = createSkewXMatrix(arg0);
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break;
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case SKEW_Y:
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matrix = createSkewYMatrix(arg0);
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break;
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case 'matrix':
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matrix = [arg0, arg1, arg2, arg3, arg4, arg5];
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break;
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}
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// snapshot current matrix into matrices array
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matrices.push(matrix);
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}
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return multiplyTransformMatrixArray(matrices);
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}
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