/// <summary>
/// エッジの矢印描画物作成。
/// </summary>
private Polygon NewArrowPoly(WWVectorD2 pos1, WWVectorD2 pos2, Brush stroke)
{
var dir2to1N = WWVectorD2.Sub(pos1, pos2).Normalize();
var dir2to1S = dir2to1N.Scale(mDP.mArrowSz);
// 2→1の方向と垂直のベクトル2つ。
var dirA = new WWVectorD2(-dir2to1N.Y, dir2to1N.X).Scale(mDP.mArrowSz * 0.5);
var dirB = new WWVectorD2(dir2to1N.Y, -dir2to1N.X).Scale(mDP.mArrowSz * 0.5);
var vecA = WWVectorD2.Add(dir2to1S, dirA);
var vecB = WWVectorD2.Add(dir2to1S, dirB);
var pos2a = WWVectorD2.Add(pos2, dir2to1N.Scale(mDP.mPointSz / 2));
var posA = WWVectorD2.Add(pos2a, vecA);
var posB = WWVectorD2.Add(pos2a, vecB);
var pc = new PointCollection();
pc.Add(new Point(posB.X, posB.Y));
pc.Add(new Point(pos2a.X, pos2a.Y));
pc.Add(new Point(posA.X, posA.Y));
var poly = new Polygon();
poly.Points = pc;
poly.Fill = stroke;
poly.StrokeThickness = 0;
return(poly);
}
/// <summary>
/// エッジの描画物を作り、キャンバスに登録。
/// 描画物が無い状態で呼んで下さい。
/// </summary>
public void EdgeDrawablesCreate(Edge edge, Brush brush)
{
System.Diagnostics.Debug.Assert(edge.line == null);
System.Diagnostics.Debug.Assert(edge.arrow == null);
var p1 = mPP.FindPointByIdx(edge.fromPointIdx, PointProc.FindPointMode.FindAll);
var p2 = mPP.FindPointByIdx(edge.toPointIdx, PointProc.FindPointMode.FindAll);
edge.line = DrawUtil.NewLine(p1.xy, p2.xy, brush);
edge.arrow = NewArrowPoly(p1.xy, p2.xy, brush);
Canvas.SetZIndex(edge.line, mDP.Z_Edge);
Canvas.SetZIndex(edge.arrow, mDP.Z_Edge);
mDP.mCanvas.Children.Add(edge.line);
mDP.mCanvas.Children.Add(edge.arrow);
// 文字を出す。
var xy = WWVectorD2.Add(p1.xy, p2.xy).Scale(0.5);
edge.tbIdx = new TextBlock();
edge.tbIdx.Padding = new Thickness(2);
edge.tbIdx.Text = EdgeDescriptionText(edge.EdgeIdx, edge.C, edge.B);
edge.tbIdx.Foreground = mDP.mEdgeTextFgBrush;
edge.tbIdx.Background = mDP.mEdgeTextBgBrush;
edge.tbIdx.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
var tbWH = edge.tbIdx.DesiredSize;
Canvas.SetLeft(edge.tbIdx, xy.X - tbWH.Width / 2);
Canvas.SetTop(edge.tbIdx, xy.Y - tbWH.Height / 2);
Canvas.SetZIndex(edge.tbIdx, mDP.Z_Edge + 1);
mDP.mCanvas.Children.Add(edge.tbIdx);
}
/// <summary>
/// エッジの係数が変更された。
/// </summary>
public void EdgeParamChanged(Edge edge, double newC, double newB)
{
edge.tbIdx.Text = EdgeDescriptionText(edge.EdgeIdx, newC, newB);
// 表示位置を調整する。
var p1 = mPP.FindPointByIdx(edge.fromPointIdx, PointProc.FindPointMode.FindAll);
var p2 = mPP.FindPointByIdx(edge.toPointIdx, PointProc.FindPointMode.FindAll);
var xy = WWVectorD2.Add(p1.xy, p2.xy).Scale(0.5);
edge.tbIdx.Measure(new Size(double.PositiveInfinity, double.PositiveInfinity));
var tbWH = edge.tbIdx.DesiredSize;
Canvas.SetLeft(edge.tbIdx, xy.X - tbWH.Width / 2);
Canvas.SetTop(edge.tbIdx, xy.Y - tbWH.Height / 2);
}