fabric/dist/src/util/misc/projectStroke/index.mjs

Object model for HTML5 canvas, and SVG-to-canvas parser. Backed by jsdom and node-canvas.

import { Point } from '../../../Point.mjs';
import { findIndexRight } from '../../internals/findRight.mjs';
import { StrokeLineCapProjections } from './StrokeLineCapProjections.mjs';
import { StrokeLineJoinProjections } from './StrokeLineJoinProjections.mjs';

/**
 *
 * Used to calculate object's bounding box
 *
 * @see https://github.com/fabricjs/fabric.js/pull/8344
 *
 */
const projectStrokeOnPoints = function (points, options) {
  let openPath = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
  const projections = [];
  if (points.length === 0) {
    return projections;
  }

  // first we remove duplicate neighboring points
  const reduced = points.reduce((reduced, point) => {
    if (!reduced[reduced.length - 1].eq(point)) {
      reduced.push(new Point(point));
    }
    return reduced;
  }, [new Point(points[0])]);
  if (reduced.length === 1) {
    openPath = true;
  } else if (!openPath) {
    // remove points from end in case they equal the first point
    // in order to correctly project the first point
    const start = reduced[0];
    const index = findIndexRight(reduced, point => !point.eq(start));
    reduced.splice(index + 1);
  }
  reduced.forEach((A, index, points) => {
    let B, C;
    if (index === 0) {
      C = points[1];
      B = openPath ? A : points[points.length - 1];
    } else if (index === points.length - 1) {
      B = points[index - 1];
      C = openPath ? A : points[0];
    } else {
      B = points[index - 1];
      C = points[index + 1];
    }
    if (openPath && points.length === 1) {
      projections.push(...new StrokeLineCapProjections(A, A, options).project());
    } else if (openPath && (index === 0 || index === points.length - 1)) {
      projections.push(...new StrokeLineCapProjections(A, index === 0 ? C : B, options).project());
    } else {
      projections.push(...new StrokeLineJoinProjections(A, B, C, options).project());
    }
  });
  return projections;
};

export { projectStrokeOnPoints };
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