// 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 points in this quadtree node.
public void DrawPoints(Graphics gr, Brush brush, Pen pen, float radius)
{
// See if this node has children.
if (Points == null)
{
// Make the children draw themselves.
NWchild.DrawPoints(gr, brush, pen, radius);
NEchild.DrawPoints(gr, brush, pen, radius);
SEchild.DrawPoints(gr, brush, pen, radius);
SWchild.DrawPoints(gr, brush, pen, radius);
}
else
{
// Draw the points in this node.
foreach (PointF point in Points)
{
gr.FillEllipse(brush, point.X - radius, point.Y - radius,
2 * radius, 2 * radius);
gr.DrawEllipse(pen, point.X - radius, point.Y - radius,
2 * radius, 2 * radius);
}
}
}