simstudioai--sim/apps/sim/lib/pptx-renderer/shapes/shape-arc.ts

/**
 * Convert OOXML arc specification to SVG path arc command.
 * Based on PPTXjs shapeArc() implementation.
 *
 * @param cx - Center X coordinate
 * @param cy - Center Y coordinate
 * @param rx - Horizontal radius
 * @param ry - Vertical radius
 * @param startAngle - Start angle in degrees
 * @param endAngle - End angle in degrees
 * @param isClose - Whether to close the path with Z
 * @returns SVG path string for the arc
 */
export function shapeArc(
  cx: number,
  cy: number,
  rx: number,
  ry: number,
  startAngle: number,
  endAngle: number,
  isClose: boolean
): string {
  const startRad = (startAngle * Math.PI) / 180
  const endRad = (endAngle * Math.PI) / 180

  const x1 = cx + rx * Math.cos(startRad)
  const y1 = cy + ry * Math.sin(startRad)
  const x2 = cx + rx * Math.cos(endRad)
  const y2 = cy + ry * Math.sin(endRad)

  // OOXML convention: always sweep clockwise from startAngle to endAngle.
  // Compute the clockwise sweep in degrees, handling angle wrapping.
  let sweepDeg = (((endAngle - startAngle) % 360) + 360) % 360
  if (sweepDeg === 0 && startAngle !== endAngle) sweepDeg = 360

  const largeArc = sweepDeg > 180 ? 1 : 0
  const sweep = 1 // always clockwise

  let d = `M${x1},${y1} A${rx},${ry} 0 ${largeArc},${sweep} ${x2},${y2}`
  if (isClose) {
    d += ' Z'
  }
  return d
}