/// <summary>
/// Helper function to draw a crosshair.
/// </summary>
/// <param name="dc"></param>
/// <param name="x"></param>
/// <param name="y"></param>
private void DrawCrossHair(
Microsoft.SPOT.Presentation.Media.DrawingContext dc, int x,
int y)
{
dc.DrawLine(pen, x - 10, y, x - 2, y);
dc.DrawLine(pen, x + 10, y, x + 2, y);
dc.DrawLine(pen, x, y - 10, x, y - 2);
dc.DrawLine(pen, x, y + 10, x, y + 2);
}
/// <summary>
/// Handles the render event.
/// </summary>
/// <param name="dc"></param>
public override void OnRender(
Microsoft.SPOT.Presentation.Media.DrawingContext dc)
{
base.OnRender(dc);
if (calibrating)
{
DrawCrossHair(dc, calPoints[currentCalPoint].x,
calPoints[currentCalPoint].y);
}
else
{
dc.DrawEllipse(brush, pen, centerx, centery, r, r);
}
}
