private void UpdatePosition()
{
Point positionInBrush = this.dragCurrentPosition * this.rootToBrushMatrix;
if (this.IsShiftDown)
{
Vector vector1 = this.initialEndPoint - this.initialStartPoint;
double length = vector1.Length;
if (length == 0.0)
{
positionInBrush = this.initialStartPoint;
}
else
{
Vector vector2 = vector1 / length;
positionInBrush = this.initialStartPoint + vector2 * (positionInBrush - this.initialStartPoint) * vector2;
}
}
Point point = RoundingHelper.RoundPosition(new Point(this.initialStartPoint.X + this.initialEndPoint.X - positionInBrush.X, this.initialStartPoint.Y + this.initialEndPoint.Y - positionInBrush.Y));
if (this.ActiveAdorner.Kind == LinearGradientAdornerKind.StartPoint)
{
positionInBrush *= this.brushToRootMatrix;
BrushTransformBehavior.OffsetDragPoint(ref positionInBrush, this.initialEndPoint * this.brushToRootMatrix, this.dragOffset, 0.001 / this.ActiveView.Zoom);
positionInBrush = RoundingHelper.RoundPosition(positionInBrush * this.rootToBrushMatrix);
this.actionString = StringTable.UndoUnitLinearGradientStart;
if (!this.HasMouseMovedAfterDown)
{
this.CopyPrimaryBrushToSelection();
}
this.SetBrushValue(LinearGradientBrushNode.StartPointProperty, (object)positionInBrush);
if (this.IsAltDown)
{
this.SetBrushValue(LinearGradientBrushNode.EndPointProperty, (object)point);
}
}
else
{
positionInBrush *= this.brushToRootMatrix;
BrushTransformBehavior.OffsetDragPoint(ref positionInBrush, this.initialStartPoint * this.brushToRootMatrix, this.dragOffset, 0.001 / this.ActiveView.Zoom);
positionInBrush = RoundingHelper.RoundPosition(positionInBrush * this.rootToBrushMatrix);
this.actionString = StringTable.UndoUnitLinearGradientEnd;
if (!this.HasMouseMovedAfterDown)
{
this.CopyPrimaryBrushToSelection();
}
this.SetBrushValue(LinearGradientBrushNode.EndPointProperty, (object)positionInBrush);
if (this.IsAltDown)
{
this.SetBrushValue(LinearGradientBrushNode.StartPointProperty, (object)point);
}
}
this.UpdateEditTransaction();
}
protected override bool OnDrag(Point dragStartPosition, Point dragCurrentPosition, bool scrollNow)
{
switch (this.ActiveAdorner.Kind)
{
case RadialGradientAdornerKind.GradientOriginPoint:
this.actionString = StringTable.UndoUnitRadialGradientOrigin;
if (!this.HasMouseMovedAfterDown)
{
this.CopyPrimaryBrushToSelection();
}
Point point = this.initialCenterInBrush;
if (Tolerances.HaveMoved(dragCurrentPosition, this.initialCenterInDocument, this.ActiveView.Zoom))
{
Point positionInBrush = this.ActiveAdorner.InverseTransformPoint(dragCurrentPosition * this.initialContextToElementMatrix, true) * this.brushToRootMatrix;
BrushTransformBehavior.OffsetDragPoint(ref positionInBrush, this.initialCenterInBrush * this.brushToRootMatrix, this.dragOffset, 0.0);
point = RoundingHelper.RoundPosition(positionInBrush * this.rootToBrushMatrix);
}
if (this.ActiveAdorner.GradientOriginPoint != point)
{
this.SetBrushValue(RadialGradientBrushNode.GradientOriginProperty, (object)point);
this.UpdateEditTransaction();
break;
}
break;
case RadialGradientAdornerKind.RadiusPoint:
this.actionString = StringTable.UndoUnitScaleRadialGradient;
if (!this.HasMouseMovedAfterDown)
{
this.CopyPrimaryBrushToSelection();
this.radiusX = (double)this.GetBrushValue(RadialGradientBrushNode.RadiusXProperty);
this.radiusY = (double)this.GetBrushValue(RadialGradientBrushNode.RadiusYProperty);
if (Math.Abs(this.radiusX) < 0.01)
{
this.radiusX = 0.01;
}
if (Math.Abs(this.radiusY) < 0.01)
{
this.radiusY = 0.01;
}
}
Vector perpendicular;
double num1 = GradientStopBehavior.VectorProjection(this.ActiveAdorner.BrushCenter * this.brushToRootMatrix, this.initialPointerPosition, dragCurrentPosition, 0.0, out perpendicular);
double num2 = RoundingHelper.RoundLength(this.radiusX * num1);
double num3 = RoundingHelper.RoundLength(this.radiusY * num1);
this.SetBrushValue(RadialGradientBrushNode.RadiusXProperty, (object)num2);
this.SetBrushValue(RadialGradientBrushNode.RadiusYProperty, (object)num3);
this.UpdateEditTransaction();
break;
}
this.ActiveView.EnsureVisible((IAdorner)this.ActiveAdorner, scrollNow);
return(true);
}