private void OnPaint(object sender, PaintEventArgs e)
{
e.Graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
TPoint lastPoint = null;
foreach (TPoint point in points)
{
if (point == selectedPoint)
{
e.Graphics.FillRectangle(Brushes.Red, point.X - 2, point.Y - 2, 5, 5);
}
else
{
e.Graphics.DrawRectangle(Pens.Black, point.X - 1, point.Y - 1, 2, 2);
}
if (clipEdgesBox.Checked && lastPoint != null)
{
e.Graphics.DrawLine(Pens.Black, lastPoint.X, lastPoint.Y, point.X, point.Y);
}
e.Graphics.DrawString(point.Index.ToString(), SystemFonts.DefaultFont, Brushes.Black, new PointF(point.X, point.Y));
lastPoint = point;
}
TPoint first = points.FirstOrDefault();
if (clipEdgesBox.Checked && first != null && lastPoint != null)
{
e.Graphics.DrawLine(Pens.Black, lastPoint.X, lastPoint.Y, first.X, first.Y);
}
if (tris != null)
{
foreach (Triangle t in tris)
{
DrawEdge(e.Graphics, t.Edge1);
DrawEdge(e.Graphics, t.Edge2);
DrawEdge(e.Graphics, t.Edge3);
if (showCircleBox.Checked)
{
int radius2 = (int)t.Circumcircle.Radius * 2;
Rectangle rect = new Rectangle(
(int)(t.Circumcircle.Center.X - t.Circumcircle.Radius),
(int)(t.Circumcircle.Center.Y - t.Circumcircle.Radius),
radius2,
radius2);
e.Graphics.DrawEllipse(Pens.Tomato, rect);
}
}
}
if (!goButton.Enabled)
{
e.Graphics.DrawLine(Pens.LightBlue, curX, 0, curX, canvas.Height);
}
}
private void OnGoClick(object sender, EventArgs e)
{
logBox.Items.Clear();
goButton.Enabled = false;
clearButton.Enabled = false;
var triangulator = new Delaunay(points);
triangulator.PointSelected += (o, pe) => {
selectedPoint = pe.SelectedPoint;
BeginInvoke(new Action(() => {
curX = (int)pe.SelectedPoint.X;
logBox.Items.Insert(0, String.Format(
"Point {0} selected ({1:#},{2:#})",
pe.SelectedPoint.Index,
pe.SelectedPoint.X,
pe.SelectedPoint.Y
));
canvas.Invalidate();
}));
Thread.Sleep(100);
};
EventHandler <TrianglesModifiedArgs> triEvent = (o, te) => {
tris = te.NewTriangles.ToList();
BeginInvoke(new Action(() => {
logBox.Items.Insert(0, String.Format(
"Triangles {0}: New count: {1}",
te.EventType,
te.NewTriangles.Count()
));
canvas.Invalidate();
}));
Thread.Sleep(100);
};
triangulator.CreatedTriangles += triEvent;
triangulator.RemovedTriangles += triEvent;
EventHandler <EdgeArgs> edgeEvent = (o, ee) => {
selectedEdge = ee.Edge;
BeginInvoke(new Action(() => {
logBox.Items.Insert(0, String.Format(
"Edge {0} between {1} and {2}",
ee.EventType,
ee.Edge.First.Index,
ee.Edge.Second.Index
));
canvas.Invalidate();
}));
Thread.Sleep(50);
};
triangulator.EdgeAdded += edgeEvent;
triangulator.EdgeRemoved += edgeEvent;
ThreadPool.QueueUserWorkItem(o => {
tris = triangulator.CalculateTriangles().ToList();
BeginInvoke(new Action(() => {
selectedEdge = null;
selectedPoint = null;
goButton.Enabled = true;
clearButton.Enabled = true;
canvas.Invalidate();
}));
});
}