export function calcRectByStartEndPoint()

in packages/shared/src/coordinate.ts [283:341]

• 59 lines of code
• 7 McCabe index (conditional complexity)

export function calcRectByStartEndPoint(
  startPoint: IPoint,
  endPoint: IPoint,
  scrollX = 0,
  scrollY = 0
) {
  let drawStartX = 0,
    drawStartY = 0
  if (
    endPoint.x + scrollX >= startPoint.x &&
    endPoint.y + scrollY >= startPoint.y
  ) {
    //4象限
    drawStartX = startPoint.x
    drawStartY = startPoint.y
    return new Rect(
      drawStartX - scrollX,
      drawStartY - scrollY,
      Math.abs(endPoint.x - startPoint.x + scrollX),
      Math.abs(endPoint.y - startPoint.y + scrollY)
    )
  } else if (
    endPoint.x + scrollX < startPoint.x &&
    endPoint.y + scrollY < startPoint.y
  ) {
    //1象限
    drawStartX = endPoint.x
    drawStartY = endPoint.y
    return new Rect(
      drawStartX,
      drawStartY,
      Math.abs(endPoint.x - startPoint.x + scrollX),
      Math.abs(endPoint.y - startPoint.y + scrollY)
    )
  } else if (
    endPoint.x + scrollX < startPoint.x &&
    endPoint.y + scrollY >= startPoint.y
  ) {
    //3象限
    drawStartX = endPoint.x
    drawStartY = startPoint.y
    return new Rect(
      drawStartX - scrollX,
      drawStartY - scrollY,
      Math.abs(endPoint.x - startPoint.x + scrollX),
      Math.abs(endPoint.y - startPoint.y + scrollY)
    )
  } else {
    //2象限
    drawStartX = startPoint.x
    drawStartY = endPoint.y
    return new Rect(
      drawStartX,
      drawStartY,
      Math.abs(endPoint.x - startPoint.x + scrollX),
      Math.abs(endPoint.y - startPoint.y + scrollY)
    )
  }
}