import { SHAPES } from '@pixi/core';
import { JOINT_TYPE } from '../core/const.mjs';

class CircleBuilder {
  path(graphicsData, _target) {
    const points = graphicsData.points;
    let x;
    let y;
    let dx;
    let dy;
    let rx;
    let ry;
    if (graphicsData.type === SHAPES.CIRC) {
      const circle = graphicsData.shape;
      x = circle.x;
      y = circle.y;
      rx = ry = circle.radius;
      dx = dy = 0;
    } else if (graphicsData.type === SHAPES.ELIP) {
      const ellipse = graphicsData.shape;
      x = ellipse.x;
      y = ellipse.y;
      rx = ellipse.width;
      ry = ellipse.height;
      dx = dy = 0;
    } else {
      const roundedRect = graphicsData.shape;
      const halfWidth = roundedRect.width / 2;
      const halfHeight = roundedRect.height / 2;
      x = roundedRect.x + halfWidth;
      y = roundedRect.y + halfHeight;
      rx = ry = Math.max(0, Math.min(roundedRect.radius, Math.min(halfWidth, halfHeight)));
      dx = halfWidth - rx;
      dy = halfHeight - ry;
    }
    if (!(rx >= 0 && ry >= 0 && dx >= 0 && dy >= 0)) {
      points.length = 0;
      return;
    }
    const n = Math.ceil(2.3 * Math.sqrt(rx + ry));
    const m = n * 8 + (dx ? 4 : 0) + (dy ? 4 : 0);
    points.length = m;
    if (m === 0) {
      return;
    }
    if (n === 0) {
      points.length = 8;
      points[0] = points[6] = x + dx;
      points[1] = points[3] = y + dy;
      points[2] = points[4] = x - dx;
      points[5] = points[7] = y - dy;
      return;
    }
    let j1 = 0;
    let j2 = n * 4 + (dx ? 2 : 0) + 2;
    let j3 = j2;
    let j4 = m;
    {
      const x0 = dx + rx;
      const y0 = dy;
      const x1 = x + x0;
      const x2 = x - x0;
      const y1 = y + y0;
      points[j1++] = x1;
      points[j1++] = y1;
      points[--j2] = y1;
      points[--j2] = x2;
      if (dy) {
        const y2 = y - y0;
        points[j3++] = x2;
        points[j3++] = y2;
        points[--j4] = y2;
        points[--j4] = x1;
      }
    }
    for (let i = 1; i < n; i++) {
      const a = Math.PI / 2 * (i / n);
      const x0 = dx + Math.cos(a) * rx;
      const y0 = dy + Math.sin(a) * ry;
      const x1 = x + x0;
      const x2 = x - x0;
      const y1 = y + y0;
      const y2 = y - y0;
      points[j1++] = x1;
      points[j1++] = y1;
      points[--j2] = y1;
      points[--j2] = x2;
      points[j3++] = x2;
      points[j3++] = y2;
      points[--j4] = y2;
      points[--j4] = x1;
    }
    {
      const x0 = dx;
      const y0 = dy + ry;
      const x1 = x + x0;
      const x2 = x - x0;
      const y1 = y + y0;
      const y2 = y - y0;
      points[j1++] = x1;
      points[j1++] = y1;
      points[--j4] = y2;
      points[--j4] = x1;
      if (dx) {
        points[j1++] = x2;
        points[j1++] = y1;
        points[--j4] = y2;
        points[--j4] = x2;
      }
    }
  }
  fill(graphicsData, target) {
    const { verts, joints } = target;
    const { points, triangles } = graphicsData;
    if (points.length === 0) {
      return;
    }
    let x;
    let y;
    if (graphicsData.type !== SHAPES.RREC) {
      const circle = graphicsData.shape;
      x = circle.x;
      y = circle.y;
    } else {
      const roundedRect = graphicsData.shape;
      x = roundedRect.x + roundedRect.width / 2;
      y = roundedRect.y + roundedRect.height / 2;
    }
    const matrix = graphicsData.matrix;
    const cx = matrix ? matrix.a * x + matrix.c * y + matrix.tx : x;
    const cy = matrix ? matrix.b * x + matrix.d * y + matrix.ty : y;
    let vertPos = 1;
    const center = 0;
    if (!graphicsData.fillAA) {
      verts.push(cx, cy);
      joints.push(JOINT_TYPE.FILL);
      verts.push(points[0], points[1]);
      joints.push(JOINT_TYPE.FILL);
      for (let i = 2; i < points.length; i += 2) {
        verts.push(points[i], points[i + 1]);
        joints.push(JOINT_TYPE.FILL);
        triangles.push(vertPos++, center, vertPos);
      }
      triangles.push(center + 1, center, vertPos);
      return;
    }
    const len = points.length;
    let x1 = points[len - 2];
    let y1 = points[len - 1];
    let nx1 = y1 - points[len - 3];
    let ny1 = points[len - 4] - x1;
    const n1 = Math.sqrt(nx1 * nx1 + ny1 * ny1);
    nx1 /= n1;
    ny1 /= n1;
    let bx1;
    let by1;
    for (let i = 0; i < len; i += 2) {
      const x2 = points[i];
      const y2 = points[i + 1];
      let nx2 = y2 - y1;
      let ny2 = x1 - x2;
      const n2 = Math.sqrt(nx2 * nx2 + ny2 * ny2);
      nx2 /= n2;
      ny2 /= n2;
      let bx2 = nx1 + nx2;
      let by2 = ny1 + ny2;
      const b2 = nx2 * bx2 + ny2 * by2;
      bx2 /= b2;
      by2 /= b2;
      if (i > 0) {
        verts.push(bx2);
        verts.push(by2);
      } else {
        bx1 = bx2;
        by1 = by2;
      }
      verts.push(cx);
      verts.push(cy);
      verts.push(x1);
      verts.push(y1);
      verts.push(x2);
      verts.push(y2);
      verts.push(0);
      verts.push(0);
      verts.push(bx2);
      verts.push(by2);
      joints.push(JOINT_TYPE.FILL_EXPAND + 2);
      joints.push(JOINT_TYPE.NONE);
      joints.push(JOINT_TYPE.NONE);
      joints.push(JOINT_TYPE.NONE);
      joints.push(JOINT_TYPE.NONE);
      joints.push(JOINT_TYPE.NONE);
      x1 = x2;
      y1 = y2;
      nx1 = nx2;
      ny1 = ny2;
    }
    verts.push(bx1);
    verts.push(by1);
  }
  line(graphicsData, target) {
    const { verts, joints } = target;
    const { points } = graphicsData;
    const joint = points.length === 8 ? graphicsData.goodJointType() : JOINT_TYPE.JOINT_MITER + 3;
    const len = points.length;
    if (len === 0) {
      return;
    }
    verts.push(points[len - 2], points[len - 1]);
    joints.push(JOINT_TYPE.NONE);
    for (let i = 0; i < len; i += 2) {
      verts.push(points[i], points[i + 1]);
      joints.push(joint);
    }
    verts.push(points[0], points[1]);
    joints.push(JOINT_TYPE.NONE);
    verts.push(points[2], points[3]);
    joints.push(JOINT_TYPE.NONE);
  }
}

export { CircleBuilder };
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