protected DesignerThumb CreateThumb(PlacementAlignment alignment, Cursor cursor, int index)
{
DesignerThumb designerThumb = new MultiPointThumb
{
Index = index,
Alignment = alignment,
Cursor = cursor,
IsPrimarySelection = true
};
AdornerPlacement ap = Place(designerThumb, alignment, index);
(designerThumb as MultiPointThumb).AdornerPlacement = ap;
AdornerPanel.SetPlacement(designerThumb, ap);
adornerPanel.Children.Add(designerThumb);
DragListener drag = new DragListener(designerThumb);
WeakEventManager <DesignerThumb, MouseButtonEventArgs> .AddHandler(designerThumb,
"PreviewMouseLeftButtonDown", ResizeThumbOnMouseLeftButtonUp);
drag.Started += drag_Started;
drag.Changed += drag_Changed;
drag.Completed += drag_Completed;
return(designerThumb);
}
private void SelectThumb(MultiPointThumb mprt)
{
PointCollection points = GetPointCollection();
Point p = points[mprt.Index];
_selectedPoints.Add(mprt.Index, p);
mprt.IsPrimarySelection = false;
}
// TODO : Remove all hide/show extensions from here.
protected void drag_Started(DragListener drag)
{
//get current thumb
MultiPointThumb mprt = (drag.Target as MultiPointThumb);
if (mprt != null)
{
SetOperation();
}
}
private void SelectThumb(MultiPointThumb mprt)
{
PointCollection points = GetPointCollection();
Point p = points[mprt.Index];
_selectedThumbs.Add(mprt.Index, new Bounds {
X = p.X, Y = p.Y
});
mprt.IsPrimarySelection = false;
}
private void ResizeThumbOnMouseLeftButtonUp(object sender, MouseButtonEventArgs mouseButtonEventArgs)
{
//get current thumb
MultiPointThumb mprt = sender as MultiPointThumb;
if (mprt != null)
{
//shift+ctrl will remove selected point
if ((Keyboard.IsKeyDown(Key.LeftShift) || Keyboard.IsKeyDown(Key.RightShift)) &&
(Keyboard.IsKeyDown(Key.LeftCtrl) || Keyboard.IsKeyDown(Key.RightCtrl)))
{
//unselect all points
ResetThumbs();
PointCollection points = GetPointCollection();
//iterate thumbs to lower index of remaining thumbs
foreach (MultiPointThumb m in adornerPanel.Children)
{
if (m.Index > mprt.Index)
{
m.Index--;
}
}
//remove point and thumb
points.RemoveAt(mprt.Index);
adornerPanel.Children.Remove(mprt);
Invalidate();
}
else
{
//if not keyboard ctrl is pressed and selected point is not previously selected, clear selection
if (!_selectedPoints.ContainsKey(mprt.Index) & !Keyboard.IsKeyDown(Key.LeftCtrl) &
!Keyboard.IsKeyDown(Key.RightCtrl))
{
ResetThumbs();
}
//add selected thumb, if ctrl pressed this could be all points in poly
if (!_selectedPoints.ContainsKey(mprt.Index))
{
SelectThumb(mprt);
}
_isDragging = false;
}
}
}
protected void drag_Completed(DragListener drag)
{
MultiPointThumb mprt = drag.Target as MultiPointThumb;
if (mprt != null)
{
if (operation != null && drag.IsCanceled)
{
operation.Abort();
}
else if (drag.IsCanceled)
{
changeGroup.Abort();
}
CommitOperation();
}
}
protected void drag_Changed(DragListener drag)
{
PointCollection points = GetPointCollection();
MultiPointThumb mprt = drag.Target as MultiPointThumb;
if (mprt != null)
{
double dx = 0;
double dy = 0;
//if has zoomed
if (_zoom != null)
{
dx = drag.Delta.X * (1 / _zoom.CurrentZoom);
dy = drag.Delta.Y * (1 / _zoom.CurrentZoom);
}
Double theta;
//if one point selected snapping angle is calculated in relation to previous point
if (_selectedPoints.Count == 1 && mprt.Index > 0)
{
theta = (180 / Math.PI) * Math.Atan2(_selectedPoints[mprt.Index].Y + dy - points[mprt.Index - 1].Y, _selectedPoints[mprt.Index].X + dx - points[mprt.Index - 1].X);
}
else //if multiple points snapping angle is calculated in relation to mouse dragging angle
{
theta = (180 / Math.PI) * Math.Atan2(dy, dx);
}
//snappingAngle is used for snapping function to horizontal or vertical plane in line drawing, and is activated by pressing ctrl or shift button
int?snapAngle = null;
//shift+alt gives a new point
if ((Keyboard.IsKeyDown(Key.LeftShift) || Keyboard.IsKeyDown(Key.RightShift)) && (Keyboard.IsKeyDown(Key.LeftAlt) || Keyboard.IsKeyDown(Key.RightAlt)))
{
//if dragging occurs on a point and that point is the only selected, a new node will be added.
//_isCtrlDragging is needed since this method is called for every x pixel that the mouse moves
//so it could be many thousands of times during a single dragging
if (!_isDragging && _selectedPoints.Count == 1 && (Math.Abs(dx) > 0 || Math.Abs(dy) > 0))
{
//duplicate point that is selected
Point p = points[mprt.Index];
//insert duplicate
points.Insert(mprt.Index, p);
//create adorner marker
CreateThumb(PlacementAlignment.BottomRight, Cursors.Cross, mprt.Index);
//set index of all points that had a higher index than selected to +1
foreach (FrameworkElement rt in adornerPanel.Children)
{
if (rt is MultiPointThumb)
{
MultiPointThumb t = rt as MultiPointThumb;
if (t.Index > mprt.Index)
{
t.Index++;
}
}
}
//set index of new point to old point index + 1
mprt.Index = mprt.Index + 1;
ResetThumbs();
SelectThumb(mprt);
}
snapAngle = 10;
}
//snapping occurs when mouse is within 10 degrees from horizontal or vertical plane if shift is pressed
else if (Keyboard.IsKeyDown(Key.LeftShift) || Keyboard.IsKeyDown(Key.RightShift))
{
snapAngle = 10;
}
//snapping occurs within 45 degree intervals that is line will always be horizontal or vertical if alt is pressed
else if (Keyboard.IsKeyDown(Key.LeftAlt) || Keyboard.IsKeyDown(Key.RightAlt))
{
snapAngle = 45;
}
_isDragging = true;
points = MovePoints(points, dx, dy, theta, snapAngle);
}
(drag.Target as DesignerThumb).InvalidateArrange();
}
