updateDrawing method

void updateDrawing(Offset point)

Implementation

void updateDrawing(Offset point) {
  if (_currentDrawingTool == null) return;

  switch (_currentDrawingTool!.type) {
    case DrawingToolType.trendLine:
      final tool = _currentDrawingTool as TrendLineTool;
      tool.endPoint = point;
      break;
    case DrawingToolType.trendAngle:
      final tool = _currentDrawingTool as TrendAngleTool;
      tool.endPoint = point;
      // 计算角度
      if (tool.startPoint != null && tool.endPoint != null) {
        final dx = tool.endPoint!.dx - tool.startPoint!.dx;
        final dy = tool.endPoint!.dy - tool.startPoint!.dy;
        tool.angle = (atan2(dy, dx) * 180 / pi).abs();
      }
      break;
    case DrawingToolType.arrow:
      final tool = _currentDrawingTool as ArrowTool;
      tool.endPoint = point;
      break;
    case DrawingToolType.verticalLine:
      final tool = _currentDrawingTool as VerticalLineTool;
      tool.xPosition = point.dx;
      break;
    case DrawingToolType.horizontalLine:
      final tool = _currentDrawingTool as HorizontalLineTool;
      tool.yPosition = point.dy;
      break;
    case DrawingToolType.horizontalRay:
      final tool = _currentDrawingTool as HorizontalRayTool;
      if (tool.direction == null) {
        tool.direction = point.dx > tool.startPoint!.dx ? 1.0 : -1.0;
      }
      break;
    case DrawingToolType.ray:
      final tool = _currentDrawingTool as RayTool;
      tool.directionPoint = point;
      break;
    case DrawingToolType.crossLine:
      final tool = _currentDrawingTool as CrossLineTool;
      tool.centerPoint = point;
      break;
  }

  _notifyToolsChanged();
}