internal Rect GetRect()
{
return(new Rect(
ModelingHelper.Round(DesignerCanvas.GetLeft(this)),
ModelingHelper.Round(DesignerCanvas.GetTop(this)),
ModelingHelper.Round(this.ActualWidth),
ModelingHelper.Round(this.ActualHeight)
));
}
private void UpdateAnchorPosition()
{
Point point, tangent;
var path = this.PathGeometry;
path.GetPointAtFractionLength(0, out point, out tangent);
this.SourceAnchorAngle = ModelingHelper.ToAngle(-tangent.Y, -tangent.X);
this.SourceAnchorPosition = point;
path.GetPointAtFractionLength(1, out point, out tangent);
this.SinkAnchorAngle = ModelingHelper.ToAngle(tangent.Y, tangent.X);
this.SinkAnchorPosition = point;
path.GetPointAtFractionLength(0.5, out point, out tangent);
this.LabelPosition = this.CenterPoint = point;
}
private static PathGeometry GenerateGeometry(List <Point> points)
{
bool pointsCreated = false;
if (points.Count > 0)
{
pointsCreated = true;
//当两个块的边叠在一起时，距离为 0，这时会造成外层的逻辑出错。所以应该做些临时的处理。
if (points.Count == 2)
{
var start = points[0];
var end = points[1];
if (ModelingHelper.RoundEqual(start, end))
{
pointsCreated = false;
//points[1] = new Point(end.X + 1, end.Y + 1);
}
}
}
if (pointsCreated)
{
var geometry = new PathGeometry();
PathFigure figure = new PathFigure();
figure.StartPoint = points[0];
points.Remove(points[0]);
figure.Segments.Add(new PolyLineSegment(points, true));
geometry.Figures.Add(figure);
return(geometry);
}
return(null);
}
private static double Round(double y)
{
return(ModelingHelper.Round(y));
}
/// <summary>
/// 计算某个点到矩形中点的角度。
/// </summary>
/// <param name="center"></param>
/// <param name="point"></param>
/// <returns></returns>
private static double AngleFromCenter(Point center, Point point)
{
return(ModelingHelper.ToAngle(point.Y - center.Y, point.X - center.X));
}
/// <summary>
/// 在可视树中找到元素的外层 DesignerCanvas
/// </summary>
/// <param name="element"></param>
/// <returns></returns>
public static DesignerCanvas GetOwnerCanvas(DependencyObject element)
{
return(ModelingHelper.GetVisualParent <DesignerCanvas>(element));
}