private void DrawArea_LeftMouseDown(object sender, MouseButtonEventArgs e)
{
var vm = DataContext as PolygonsViewModel;
var drawArea = sender as ItemsControl;
var pos = e.GetPosition(drawArea);
int x = (int)(pos.X / drawArea.ActualWidth * vm.BitmapWidth);
int y = (int)(pos.Y / drawArea.ActualHeight * vm.BitmapHeight);
if (vm.IsCreating)
{
if (vm.SelectedPolygon.Points.Count > 3)
{
var dist = PointsHelpers.Distance(vm.SelectedPolygon.Points[0].X, vm.SelectedPolygon.Points[0].Y, x, y);
Debug.WriteLine("Distance: " + dist.ToString());
}
if (vm.SelectedPolygon.Points.Count >= 3 && PointsHelpers.Distance(vm.SelectedPolygon.Points[0].X, vm.SelectedPolygon.Points[0].Y, x, y) <= 15)
{
vm.IsCreating = false;
vm.SelectedPolygon.RenderBitmap();
}
else
{
vm.SelectedPolygon.AddPoint(new DragablePoint(x, y));
vm.SelectedPolygon.RenderBitmap(true);
}
}
else
{
Polygon clicked = null;
foreach (var poly in vm.Polygons.Reverse())
{
if (poly.IsHit(new Point(x, y)))
{
clicked = poly;
break;
}
}
vm.SelectedPolygon = clicked;
if (clicked == null)
{
Debug.WriteLine("Selected: null");
}
else
{
Debug.WriteLine("Selected:" + clicked.Name);
}
if (vm.SelectedPolygon != null)
{
if (e.LeftButton == MouseButtonState.Pressed)
{
if (!vm.IsAddingRelation)
{
foreach (var pnt in vm.SelectedPolygon.Points)
{
if (pnt.IsHit(x, y, 6))
{
if (!pnt.IsBlocked)
{
selectedPoint = pnt;
dragStartPoint = new Point(x, y);
vm.IsPointDragged = true;
return;
}
}
}
}
foreach (var line in vm.SelectedPolygon.Lines)
{
if (line.IsHit(x, y, 6))
{
if (vm.IsAddingRelation)
{
if (line.Relation == Relation.NONE)
{
vm.AddRelationEnd(line);
vm.SelectedPolygon.FixRelations(line.Second.IsBlocked ? line.First : line.Second);
vm.SelectedPolygon.RenderBitmap();
}
}
else
{
if (!(line.First.IsBlocked || line.Second.IsBlocked))
{
dragStartPoint = new Point(x, y);
selectedLine = line;
lineInitial = (new DragablePoint(line.First.X, line.First.Y), new DragablePoint(line.Second.X, line.Second.Y));
vm.IsLineDragged = true;
return;
}
}
}
}
if (!vm.IsAddingRelation && !vm.SelectedPolygon.IsAnyPointBlocked)
{
dragStartPoint = new Point(x, y);
vm.IsMoving = true;
}
}
}
}
}
public bool IsHit(int x1, int y1, int margin)
{
return(PointsHelpers.Distance(X, Y, x1, y1) <= margin);
}
public bool IsHit(int x, int y, int margin)
{
return(PointsHelpers.DistanceToLine(First.X, First.Y,
Second.X, Second.Y, x, y) <= margin);
}