protected override void DoUpdateElementPosition(Point pointBegin, Point pointEnd)
{
PathGeometry path = new PathGeometry();
PathGeometryEditor pathGeometryEditor = new PathGeometryEditor(path);
pathGeometryEditor.StartFigure(pointBegin);
pathGeometryEditor.AppendLineSegment(pointEnd);
using (ScenePathEditorTarget pathEditorTarget = new ScenePathEditorTarget((PathElement)this.EditingElement))
{
pathEditorTarget.BeginEditing();
pathEditorTarget.PathGeometry = path;
pathEditorTarget.EndEditing(true);
}
}
protected override void OnBegin(PathEditContext pathEditContext, MouseDevice mouseDevice)
{
PerformanceUtility.MeasurePerformanceUntilRender(PerformanceEvent.EditPath);
Vector lastTangent = this.LastTangent;
base.OnBegin(pathEditContext, mouseDevice);
PathGeometryEditor pathGeometryEditor = this.BeginEditing();
Matrix elementTransformToRoot = this.EditingElementTransformToRoot;
Point lastPoint = this.GetLastPoint(pathEditContext.FigureIndex);
Point point1 = elementTransformToRoot.Transform(lastPoint);
Vector vector = this.GetPointInViewRootCoordinates(mouseDevice, true) - point1;
Size devicePixelSize = DeviceUtilities.GetDevicePixelSize(this.View.Zoom);
if (Math.Abs(vector.X) < devicePixelSize.Width / 2.0)
{
vector.X = 0.0;
}
if (Math.Abs(vector.Y) < devicePixelSize.Height / 2.0)
{
vector.Y = 0.0;
}
Vector correspondingVector = ElementUtilities.GetCorrespondingVector(vector, elementTransformToRoot, this.IsShiftDown ? this.AxisConstraint : (AxisConstraint)null);
Point point2 = lastPoint + correspondingVector;
if (VectorUtilities.IsZero(lastTangent))
{
pathGeometryEditor.AppendLineSegment(point2, pathEditContext.FigureIndex);
}
else
{
Point q = lastPoint + lastTangent;
pathGeometryEditor.AppendCubicBezier(q, point2, point2, pathEditContext.FigureIndex);
}
int figureIndex = pathEditContext.FigureIndex;
PathFigure figure = this.Path.Figures[figureIndex];
this.PathEditContext = new PathEditContext(figureIndex, PathFigureUtilities.PointCount(figure) - 1);
this.Initialize(elementTransformToRoot.Transform(point2), true, elementTransformToRoot);
}