'use strict';

var Point = require('../../../../maths/point/Point.js');
var _const = require('../const.js');
var getOrientationOfPoints = require('../utils/getOrientationOfPoints.js');

"use strict";
function square(x, y, nx, ny, innerWeight, outerWeight, clockwise, verts) {
  const ix = x - nx * innerWeight;
  const iy = y - ny * innerWeight;
  const ox = x + nx * outerWeight;
  const oy = y + ny * outerWeight;
  let exx;
  let eyy;
  if (clockwise) {
    exx = ny;
    eyy = -nx;
  } else {
    exx = -ny;
    eyy = nx;
  }
  const eix = ix + exx;
  const eiy = iy + eyy;
  const eox = ox + exx;
  const eoy = oy + eyy;
  verts.push(eix, eiy);
  verts.push(eox, eoy);
  return 2;
}
function round(cx, cy, sx, sy, ex, ey, verts, clockwise) {
  const cx2p0x = sx - cx;
  const cy2p0y = sy - cy;
  let angle0 = Math.atan2(cx2p0x, cy2p0y);
  let angle1 = Math.atan2(ex - cx, ey - cy);
  if (clockwise && angle0 < angle1) {
    angle0 += Math.PI * 2;
  } else if (!clockwise && angle0 > angle1) {
    angle1 += Math.PI * 2;
  }
  let startAngle = angle0;
  const angleDiff = angle1 - angle0;
  const absAngleDiff = Math.abs(angleDiff);
  const radius = Math.sqrt(cx2p0x * cx2p0x + cy2p0y * cy2p0y);
  const segCount = (15 * absAngleDiff * Math.sqrt(radius) / Math.PI >> 0) + 1;
  const angleInc = angleDiff / segCount;
  startAngle += angleInc;
  if (clockwise) {
    verts.push(cx, cy);
    verts.push(sx, sy);
    for (let i = 1, angle = startAngle; i < segCount; i++, angle += angleInc) {
      verts.push(cx, cy);
      verts.push(
        cx + Math.sin(angle) * radius,
        cy + Math.cos(angle) * radius
      );
    }
    verts.push(cx, cy);
    verts.push(ex, ey);
  } else {
    verts.push(sx, sy);
    verts.push(cx, cy);
    for (let i = 1, angle = startAngle; i < segCount; i++, angle += angleInc) {
      verts.push(
        cx + Math.sin(angle) * radius,
        cy + Math.cos(angle) * radius
      );
      verts.push(cx, cy);
    }
    verts.push(ex, ey);
    verts.push(cx, cy);
  }
  return segCount * 2;
}
function buildLine(points, lineStyle, flipAlignment, closed, vertices, _verticesStride, _verticesOffset, indices, _indicesOffset) {
  const eps = _const.closePointEps;
  if (points.length === 0) {
    return;
  }
  const style = lineStyle;
  let alignment = style.alignment;
  if (lineStyle.alignment !== 0.5) {
    let orientation = getOrientationOfPoints.getOrientationOfPoints(points);
    if (flipAlignment)
      orientation *= -1;
    alignment = (alignment - 0.5) * orientation + 0.5;
  }
  const firstPoint = new Point.Point(points[0], points[1]);
  const lastPoint = new Point.Point(points[points.length - 2], points[points.length - 1]);
  const closedShape = closed;
  const closedPath = Math.abs(firstPoint.x - lastPoint.x) < eps && Math.abs(firstPoint.y - lastPoint.y) < eps;
  if (closedShape) {
    points = points.slice();
    if (closedPath) {
      points.pop();
      points.pop();
      lastPoint.set(points[points.length - 2], points[points.length - 1]);
    }
    const midPointX = (firstPoint.x + lastPoint.x) * 0.5;
    const midPointY = (lastPoint.y + firstPoint.y) * 0.5;
    points.unshift(midPointX, midPointY);
    points.push(midPointX, midPointY);
  }
  const verts = vertices;
  const length = points.length / 2;
  let indexCount = points.length;
  const indexStart = verts.length / 2;
  const width = style.width / 2;
  const widthSquared = width * width;
  const miterLimitSquared = style.miterLimit * style.miterLimit;
  let x0 = points[0];
  let y0 = points[1];
  let x1 = points[2];
  let y1 = points[3];
  let x2 = 0;
  let y2 = 0;
  let perpX = -(y0 - y1);
  let perpY = x0 - x1;
  let perp1x = 0;
  let perp1y = 0;
  let dist = Math.sqrt(perpX * perpX + perpY * perpY);
  perpX /= dist;
  perpY /= dist;
  perpX *= width;
  perpY *= width;
  const ratio = alignment;
  const innerWeight = (1 - ratio) * 2;
  const outerWeight = ratio * 2;
  if (!closedShape) {
    if (style.cap === "round") {
      indexCount += round(
        x0 - perpX * (innerWeight - outerWeight) * 0.5,
        y0 - perpY * (innerWeight - outerWeight) * 0.5,
        x0 - perpX * innerWeight,
        y0 - perpY * innerWeight,
        x0 + perpX * outerWeight,
        y0 + perpY * outerWeight,
        verts,
        true
      ) + 2;
    } else if (style.cap === "square") {
      indexCount += square(x0, y0, perpX, perpY, innerWeight, outerWeight, true, verts);
    }
  }
  verts.push(
    x0 - perpX * innerWeight,
    y0 - perpY * innerWeight
  );
  verts.push(
    x0 + perpX * outerWeight,
    y0 + perpY * outerWeight
  );
  for (let i = 1; i < length - 1; ++i) {
    x0 = points[(i - 1) * 2];
    y0 = points[(i - 1) * 2 + 1];
    x1 = points[i * 2];
    y1 = points[i * 2 + 1];
    x2 = points[(i + 1) * 2];
    y2 = points[(i + 1) * 2 + 1];
    perpX = -(y0 - y1);
    perpY = x0 - x1;
    dist = Math.sqrt(perpX * perpX + perpY * perpY);
    perpX /= dist;
    perpY /= dist;
    perpX *= width;
    perpY *= width;
    perp1x = -(y1 - y2);
    perp1y = x1 - x2;
    dist = Math.sqrt(perp1x * perp1x + perp1y * perp1y);
    perp1x /= dist;
    perp1y /= dist;
    perp1x *= width;
    perp1y *= width;
    const dx0 = x1 - x0;
    const dy0 = y0 - y1;
    const dx1 = x1 - x2;
    const dy1 = y2 - y1;
    const dot = dx0 * dx1 + dy0 * dy1;
    const cross = dy0 * dx1 - dy1 * dx0;
    const clockwise = cross < 0;
    if (Math.abs(cross) < 1e-3 * Math.abs(dot)) {
      verts.push(
        x1 - perpX * innerWeight,
        y1 - perpY * innerWeight
      );
      verts.push(
        x1 + perpX * outerWeight,
        y1 + perpY * outerWeight
      );
      if (dot >= 0) {
        if (style.join === "round") {
          indexCount += round(
            x1,
            y1,
            x1 - perpX * innerWeight,
            y1 - perpY * innerWeight,
            x1 - perp1x * innerWeight,
            y1 - perp1y * innerWeight,
            verts,
            false
          ) + 4;
        } else {
          indexCount += 2;
        }
        verts.push(
          x1 - perp1x * outerWeight,
          y1 - perp1y * outerWeight
        );
        verts.push(
          x1 + perp1x * innerWeight,
          y1 + perp1y * innerWeight
        );
      }
      continue;
    }
    const c1 = (-perpX + x0) * (-perpY + y1) - (-perpX + x1) * (-perpY + y0);
    const c2 = (-perp1x + x2) * (-perp1y + y1) - (-perp1x + x1) * (-perp1y + y2);
    const px = (dx0 * c2 - dx1 * c1) / cross;
    const py = (dy1 * c1 - dy0 * c2) / cross;
    const pDist = (px - x1) * (px - x1) + (py - y1) * (py - y1);
    const imx = x1 + (px - x1) * innerWeight;
    const imy = y1 + (py - y1) * innerWeight;
    const omx = x1 - (px - x1) * outerWeight;
    const omy = y1 - (py - y1) * outerWeight;
    const smallerInsideSegmentSq = Math.min(dx0 * dx0 + dy0 * dy0, dx1 * dx1 + dy1 * dy1);
    const insideWeight = clockwise ? innerWeight : outerWeight;
    const smallerInsideDiagonalSq = smallerInsideSegmentSq + insideWeight * insideWeight * widthSquared;
    const insideMiterOk = pDist <= smallerInsideDiagonalSq;
    if (insideMiterOk) {
      if (style.join === "bevel" || pDist / widthSquared > miterLimitSquared) {
        if (clockwise) {
          verts.push(imx, imy);
          verts.push(x1 + perpX * outerWeight, y1 + perpY * outerWeight);
          verts.push(imx, imy);
          verts.push(x1 + perp1x * outerWeight, y1 + perp1y * outerWeight);
        } else {
          verts.push(x1 - perpX * innerWeight, y1 - perpY * innerWeight);
          verts.push(omx, omy);
          verts.push(x1 - perp1x * innerWeight, y1 - perp1y * innerWeight);
          verts.push(omx, omy);
        }
        indexCount += 2;
      } else if (style.join === "round") {
        if (clockwise) {
          verts.push(imx, imy);
          verts.push(x1 + perpX * outerWeight, y1 + perpY * outerWeight);
          indexCount += round(
            x1,
            y1,
            x1 + perpX * outerWeight,
            y1 + perpY * outerWeight,
            x1 + perp1x * outerWeight,
            y1 + perp1y * outerWeight,
            verts,
            true
          ) + 4;
          verts.push(imx, imy);
          verts.push(x1 + perp1x * outerWeight, y1 + perp1y * outerWeight);
        } else {
          verts.push(x1 - perpX * innerWeight, y1 - perpY * innerWeight);
          verts.push(omx, omy);
          indexCount += round(
            x1,
            y1,
            x1 - perpX * innerWeight,
            y1 - perpY * innerWeight,
            x1 - perp1x * innerWeight,
            y1 - perp1y * innerWeight,
            verts,
            false
          ) + 4;
          verts.push(x1 - perp1x * innerWeight, y1 - perp1y * innerWeight);
          verts.push(omx, omy);
        }
      } else {
        verts.push(imx, imy);
        verts.push(omx, omy);
      }
    } else {
      verts.push(x1 - perpX * innerWeight, y1 - perpY * innerWeight);
      verts.push(x1 + perpX * outerWeight, y1 + perpY * outerWeight);
      if (style.join === "round") {
        if (clockwise) {
          indexCount += round(
            x1,
            y1,
            x1 + perpX * outerWeight,
            y1 + perpY * outerWeight,
            x1 + perp1x * outerWeight,
            y1 + perp1y * outerWeight,
            verts,
            true
          ) + 2;
        } else {
          indexCount += round(
            x1,
            y1,
            x1 - perpX * innerWeight,
            y1 - perpY * innerWeight,
            x1 - perp1x * innerWeight,
            y1 - perp1y * innerWeight,
            verts,
            false
          ) + 2;
        }
      } else if (style.join === "miter" && pDist / widthSquared <= miterLimitSquared) {
        if (clockwise) {
          verts.push(omx, omy);
          verts.push(omx, omy);
        } else {
          verts.push(imx, imy);
          verts.push(imx, imy);
        }
        indexCount += 2;
      }
      verts.push(x1 - perp1x * innerWeight, y1 - perp1y * innerWeight);
      verts.push(x1 + perp1x * outerWeight, y1 + perp1y * outerWeight);
      indexCount += 2;
    }
  }
  x0 = points[(length - 2) * 2];
  y0 = points[(length - 2) * 2 + 1];
  x1 = points[(length - 1) * 2];
  y1 = points[(length - 1) * 2 + 1];
  perpX = -(y0 - y1);
  perpY = x0 - x1;
  dist = Math.sqrt(perpX * perpX + perpY * perpY);
  perpX /= dist;
  perpY /= dist;
  perpX *= width;
  perpY *= width;
  verts.push(x1 - perpX * innerWeight, y1 - perpY * innerWeight);
  verts.push(x1 + perpX * outerWeight, y1 + perpY * outerWeight);
  if (!closedShape) {
    if (style.cap === "round") {
      indexCount += round(
        x1 - perpX * (innerWeight - outerWeight) * 0.5,
        y1 - perpY * (innerWeight - outerWeight) * 0.5,
        x1 - perpX * innerWeight,
        y1 - perpY * innerWeight,
        x1 + perpX * outerWeight,
        y1 + perpY * outerWeight,
        verts,
        false
      ) + 2;
    } else if (style.cap === "square") {
      indexCount += square(x1, y1, perpX, perpY, innerWeight, outerWeight, false, verts);
    }
  }
  const eps2 = _const.curveEps * _const.curveEps;
  for (let i = indexStart; i < indexCount + indexStart - 2; ++i) {
    x0 = verts[i * 2];
    y0 = verts[i * 2 + 1];
    x1 = verts[(i + 1) * 2];
    y1 = verts[(i + 1) * 2 + 1];
    x2 = verts[(i + 2) * 2];
    y2 = verts[(i + 2) * 2 + 1];
    if (Math.abs(x0 * (y1 - y2) + x1 * (y2 - y0) + x2 * (y0 - y1)) < eps2) {
      continue;
    }
    indices.push(i, i + 1, i + 2);
  }
}

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