// Display the points.
private void pointsPictureBox_Paint(object sender, PaintEventArgs e)
{
e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
// Draw the points.
#if USE_COLOR
Root.DrawPoints(e.Graphics, Brushes.White, Pens.Blue, Radius);
#else
Root.DrawPoints(e.Graphics, Brushes.White, Pens.Black, Radius);
#endif
// Draw the selected point.
if (PointIsSelected)
{
#if USE_COLOR
e.Graphics.FillEllipse(Brushes.LightGreen,
SelectedPoint.X - Radius, SelectedPoint.Y - Radius,
2 * Radius, 2 * Radius);
e.Graphics.DrawEllipse(Pens.Green,
SelectedPoint.X - Radius, SelectedPoint.Y - Radius,
2 * Radius, 2 * Radius);
#else
e.Graphics.FillEllipse(Brushes.Gray,
SelectedPoint.X - Radius, SelectedPoint.Y - Radius,
2 * Radius, 2 * Radius);
e.Graphics.DrawEllipse(Pens.Black,
SelectedPoint.X - Radius, SelectedPoint.Y - Radius,
2 * Radius, 2 * Radius);
#endif
}
// Draw the quadtree if desired.
if (drawBoxesCheckBox.Checked)
{
e.Graphics.SmoothingMode = SmoothingMode.None;
#if USE_COLOR
Root.DrawAreas(e.Graphics, Pens.Red);
#else
Root.DrawAreas(e.Graphics, Pens.Black);
#endif
}
}
// Draw the quadtree areas.
public void DrawAreas(Graphics gr, Pen pen)
{
// Draw this quadtree node's area.
gr.DrawRectangle(pen, Area.Left, Area.Top, Area.Width, Area.Height);
// Draw the child nodes.
if (NWchild != null)
{
NWchild.DrawAreas(gr, pen);
NEchild.DrawAreas(gr, pen);
SEchild.DrawAreas(gr, pen);
SWchild.DrawAreas(gr, pen);
}
}