pixi.js/lib/scene/graphics/shared/utils/getMaxMiterRatio.js

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'use strict';

"use strict";
function getMaxMiterRatio(path, miterLimit) {
  let maxRatio = 1;
  const shapePrimitives = path.shapePath.shapePrimitives;
  for (let i = 0; i < shapePrimitives.length; i++) {
    const shape = shapePrimitives[i].shape;
    if (shape.type !== "polygon") continue;
    const points = shape.points;
    const n = points.length;
    if (n < 6) continue;
    const closed = shape.closePath;
    for (let j = 0; j < n; j += 2) {
      if (!closed && (j === 0 || j === n - 2)) continue;
      const prevIdx = (j - 2 + n) % n;
      const nextIdx = (j + 2) % n;
      const x0 = points[prevIdx];
      const y0 = points[prevIdx + 1];
      const x1 = points[j];
      const y1 = points[j + 1];
      const x2 = points[nextIdx];
      const y2 = points[nextIdx + 1];
      const dx0 = x0 - x1;
      const dy0 = y0 - y1;
      const dx1 = x2 - x1;
      const dy1 = y2 - y1;
      const len0Sq = dx0 * dx0 + dy0 * dy0;
      const len1Sq = dx1 * dx1 + dy1 * dy1;
      if (len0Sq < 1e-12 || len1Sq < 1e-12) continue;
      const dot = dx0 * dx1 + dy0 * dy1;
      const cosAngle = dot / Math.sqrt(len0Sq * len1Sq);
      let clampedCos = cosAngle;
      if (clampedCos < -1) clampedCos = -1;
      else if (clampedCos > 1) clampedCos = 1;
      const sinHalfAngle = Math.sqrt((1 - clampedCos) * 0.5);
      if (sinHalfAngle < 1e-6) continue;
      const miterRatio = Math.min(1 / sinHalfAngle, miterLimit);
      if (miterRatio > maxRatio) maxRatio = miterRatio;
    }
  }
  return maxRatio;
}

exports.getMaxMiterRatio = getMaxMiterRatio;
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