nothoughts/node_modules/pixi.js/lib/scene/graphics/shared/buildCommands/buildArcToSvg.js

'use strict';

var buildAdaptiveBezier = require('./buildAdaptiveBezier.js');

"use strict";
const TAU = Math.PI * 2;
const out = {
  centerX: 0,
  centerY: 0,
  ang1: 0,
  ang2: 0
};
const mapToEllipse = ({ x, y }, rx, ry, cosPhi, sinPhi, centerX, centerY, out2) => {
  x *= rx;
  y *= ry;
  const xp = cosPhi * x - sinPhi * y;
  const yp = sinPhi * x + cosPhi * y;
  out2.x = xp + centerX;
  out2.y = yp + centerY;
  return out2;
};
function approxUnitArc(ang1, ang2) {
  const a1 = ang2 === -1.5707963267948966 ? -0.551915024494 : 4 / 3 * Math.tan(ang2 / 4);
  const a = ang2 === 1.5707963267948966 ? 0.551915024494 : a1;
  const x1 = Math.cos(ang1);
  const y1 = Math.sin(ang1);
  const x2 = Math.cos(ang1 + ang2);
  const y2 = Math.sin(ang1 + ang2);
  return [
    {
      x: x1 - y1 * a,
      y: y1 + x1 * a
    },
    {
      x: x2 + y2 * a,
      y: y2 - x2 * a
    },
    {
      x: x2,
      y: y2
    }
  ];
}
const vectorAngle = (ux, uy, vx, vy) => {
  const sign = ux * vy - uy * vx < 0 ? -1 : 1;
  let dot = ux * vx + uy * vy;
  if (dot > 1) {
    dot = 1;
  }
  if (dot < -1) {
    dot = -1;
  }
  return sign * Math.acos(dot);
};
const getArcCenter = (px, py, cx, cy, rx, ry, largeArcFlag, sweepFlag, sinPhi, cosPhi, pxp, pyp, out2) => {
  const rxSq = Math.pow(rx, 2);
  const rySq = Math.pow(ry, 2);
  const pxpSq = Math.pow(pxp, 2);
  const pypSq = Math.pow(pyp, 2);
  let radicant = rxSq * rySq - rxSq * pypSq - rySq * pxpSq;
  if (radicant < 0) {
    radicant = 0;
  }
  radicant /= rxSq * pypSq + rySq * pxpSq;
  radicant = Math.sqrt(radicant) * (largeArcFlag === sweepFlag ? -1 : 1);
  const centerXp = radicant * rx / ry * pyp;
  const centerYp = radicant * -ry / rx * pxp;
  const centerX = cosPhi * centerXp - sinPhi * centerYp + (px + cx) / 2;
  const centerY = sinPhi * centerXp + cosPhi * centerYp + (py + cy) / 2;
  const vx1 = (pxp - centerXp) / rx;
  const vy1 = (pyp - centerYp) / ry;
  const vx2 = (-pxp - centerXp) / rx;
  const vy2 = (-pyp - centerYp) / ry;
  const ang1 = vectorAngle(1, 0, vx1, vy1);
  let ang2 = vectorAngle(vx1, vy1, vx2, vy2);
  if (sweepFlag === 0 && ang2 > 0) {
    ang2 -= TAU;
  }
  if (sweepFlag === 1 && ang2 < 0) {
    ang2 += TAU;
  }
  out2.centerX = centerX;
  out2.centerY = centerY;
  out2.ang1 = ang1;
  out2.ang2 = ang2;
};
function buildArcToSvg(points, px, py, cx, cy, rx, ry, xAxisRotation = 0, largeArcFlag = 0, sweepFlag = 0) {
  if (rx === 0 || ry === 0) {
    return;
  }
  const sinPhi = Math.sin(xAxisRotation * TAU / 360);
  const cosPhi = Math.cos(xAxisRotation * TAU / 360);
  const pxp = cosPhi * (px - cx) / 2 + sinPhi * (py - cy) / 2;
  const pyp = -sinPhi * (px - cx) / 2 + cosPhi * (py - cy) / 2;
  if (pxp === 0 && pyp === 0) {
    return;
  }
  rx = Math.abs(rx);
  ry = Math.abs(ry);
  const lambda = Math.pow(pxp, 2) / Math.pow(rx, 2) + Math.pow(pyp, 2) / Math.pow(ry, 2);
  if (lambda > 1) {
    rx *= Math.sqrt(lambda);
    ry *= Math.sqrt(lambda);
  }
  getArcCenter(
    px,
    py,
    cx,
    cy,
    rx,
    ry,
    largeArcFlag,
    sweepFlag,
    sinPhi,
    cosPhi,
    pxp,
    pyp,
    out
  );
  let { ang1, ang2 } = out;
  const { centerX, centerY } = out;
  let ratio = Math.abs(ang2) / (TAU / 4);
  if (Math.abs(1 - ratio) < 1e-7) {
    ratio = 1;
  }
  const segments = Math.max(Math.ceil(ratio), 1);
  ang2 /= segments;
  let lastX = points[points.length - 2];
  let lastY = points[points.length - 1];
  const outCurvePoint = { x: 0, y: 0 };
  for (let i = 0; i < segments; i++) {
    const curve = approxUnitArc(ang1, ang2);
    const { x: x1, y: y1 } = mapToEllipse(curve[0], rx, ry, cosPhi, sinPhi, centerX, centerY, outCurvePoint);
    const { x: x2, y: y2 } = mapToEllipse(curve[1], rx, ry, cosPhi, sinPhi, centerX, centerY, outCurvePoint);
    const { x, y } = mapToEllipse(curve[2], rx, ry, cosPhi, sinPhi, centerX, centerY, outCurvePoint);
    buildAdaptiveBezier.buildAdaptiveBezier(
      points,
      lastX,
      lastY,
      x1,
      y1,
      x2,
      y2,
      x,
      y
    );
    lastX = x;
    lastY = y;
    ang1 += ang2;
  }
}

exports.buildArcToSvg = buildArcToSvg;
//# sourceMappingURL=buildArcToSvg.js.map