/// <summary>
/// Remember the latest point defining a zoom by rectangle.
/// This should be called by a MouseMove handler.
/// </summary>
/// <param name="p">The updated position</param>
void RectUpdate(IPosition p)
{
MapControl display = this.MapControl;
// Remember the second corner for the next draw (the first
// corner was defined by RectBegin).
m_SecondCorner = p;
// If we previously drew a rectangle, get rid of it by
// re-drawing it so that it disappears
if (!m_Rect.IsEmpty)
{
display.DrawReversibleFrame(m_Rect);
m_Rect = Rectangle.Empty;
}
// Create new rectangle and draw it
Window x = new Window(m_FirstCorner, m_SecondCorner);
m_Rect = display.DrawReversibleFrame(x);
}
/// <summary>
/// Finishes off a zoom by rectangle
/// </summary>
void RectFinish()
{
// Only do stuff if a rectangle has been defined
if (!m_Rect.IsEmpty)
{
// Make the rectangle invisible
MapControl display = this.MapControl;
display.DrawReversibleFrame(m_Rect);
m_Rect = Rectangle.Empty;
// Define the new draw window
display.SetNewWindow(new Window(m_FirstCorner, m_SecondCorner), true);
}
Finish();
}