protected override void OnMouseWheel(MouseWheelEventArgs e)
{
base.OnMouseWheel(e);
if (null == ViewModel)
{
return;
}
if (!_IsWheeling)
{
History.NodeGraphHistory history = ViewModel.Model.History;
history.BeginTransaction("Zooming");
_ZoomAndPanStartMatrix = ZoomAndPan.Matrix;
}
_WheelStartTime = _CurrentTime;
_IsWheeling = true;
double newScale = _ZoomAndPan.Scale;
newScale += (0.0 > e.Delta) ? -0.05 : 0.05;
newScale = Math.Max(0.1, Math.Min(1.0, newScale));
Point vsZoomCenter = e.GetPosition(this);
Point zoomCenter = _ZoomAndPan.MatrixInv.Transform(vsZoomCenter);
_ZoomAndPan.Scale = newScale;
Point vsNextZoomCenter = _ZoomAndPan.Matrix.Transform(zoomCenter);
Point vsDelta = new Point(vsZoomCenter.X - vsNextZoomCenter.X, vsZoomCenter.Y - vsNextZoomCenter.Y);
_ZoomAndPan.StartX -= vsDelta.X;
_ZoomAndPan.StartY -= vsDelta.Y;
}
protected override void OnMouseRightButtonDown(MouseButtonEventArgs e)
{
base.OnMouseRightButtonDown(e);
if (null == ViewModel)
{
return;
}
Keyboard.Focus(this);
_RightButtonDownPos = e.GetPosition(this);
_ZoomAndPanStartMatrix = ZoomAndPan.Matrix;
if (!NodeGraphManager.IsDragging)
{
_IsDraggingCanvas = true;
Mouse.Capture(this, CaptureMode.SubTree);
History.NodeGraphHistory history = ViewModel.Model.History;
history.BeginTransaction("Panning");
}
}