CircleDragInfo AddCylinder(Cylinder area)
{
var info = new CircleDragInfo
{
Area = area,
Center = new Ellipse { Fill = Brushes.Yellow, Width = centerSize, Height = centerSize, Opacity = 0.5 },
Circle = new Ellipse
{
Fill = Brushes.Red,
StrokeThickness = 5,
Opacity = 0.3,
Stroke = Brushes.Yellow,
Width = area.R * 2,
Height = area.R * 2
}
};
Canvas.SetLeft(info.Circle, area.X - area.R);
Canvas.SetTop(info.Circle, area.Y - area.R);
Canvas.SetLeft(info.Center, area.X - centerSize / 2.0);
Canvas.SetTop(info.Center, area.Y - centerSize / 2.0);
areaInfos.Add(info);
canvas.Children.Add(info.Circle);
canvas.Children.Add(info.Center);
return info;
}
void canvas_MouseDown(object sender, MouseButtonEventArgs e)
{
if (Keyboard.Modifiers == ModifierKeys.None)
{
e.Handled = true;
var startPoint = e.GetPosition(canvas);
if (dragInfo is NoArea)
{
if (circleButton.IsChecked == true)
{
// create circle
canvas.CaptureMouse();
var area = new Cylinder { X = startPoint.X, Y = startPoint.Y, R = 0 };
var info = AddCylinder(area);
dragInfo = info;
Region.Areas.Add(info.Area);
}
else if (rectangleButton.IsChecked == true)
{
// create rectangle
canvas.CaptureMouse();
var area = new RectangularArea { X = startPoint.X, Y = startPoint.Y, Height = 0, Width = 0 };
var info = AddRectangle(area);
dragInfo = info;
Region.Areas.Add(info.Area);
}
else if (deleteButton.IsChecked == true && e.Source is Shape)
{
// delete shape
foreach (var info in areaInfos.ToArray())
{
// remove area
var circleDragInfo = info as CircleDragInfo;
if (circleDragInfo != null &&
(circleDragInfo.Center == e.Source || circleDragInfo.Circle == e.Source))
{
areaInfos.Remove(circleDragInfo);
Region.Areas.Remove(circleDragInfo.Area);
canvas.Children.Remove(circleDragInfo.Center);
canvas.Children.Remove(circleDragInfo.Circle);
}
var rectangleDragInfo = info as RectangleDragInfo;
if (rectangleDragInfo != null && (rectangleDragInfo.Rectangle == e.Source))
{
areaInfos.Remove(rectangleDragInfo);
Region.Areas.Remove(rectangleDragInfo.Area);
canvas.Children.Remove(rectangleDragInfo.Rectangle);
}
if (info is NoArea) throw new Exception("NoArea should not be in the list");
}
}
}
}
}