/// <summary>
/// Shows the specified annotation.
/// </summary>
/// <param name="annotation">The text annotation</param>
/// <param name="text">The message text.</param>
/// <param name="anchor">The message anchor.</param>
private void OnShowAnnotation(MapTextAnnotation annotation, string text, IAnchor anchor)
{
// Get the old message bounds.
Rectangle oldBounds = annotation.Bounds;
// Suspend the message layout.
annotation.SuspendLayout();
// Set the new message properties.
annotation.Text = text;
annotation.Anchor = anchor;
// Result the message layout.
annotation.ResumeLayout();
// Get the new message bounds.
Rectangle newBounds = annotation.Bounds;
// If the message is currently visible.
if (annotation.Visible)
{
// Invalidate the area corresponding to the old annotation bounds.
this.Invalidate(oldBounds);
}
else
{
// Set the annotation visibility to true.
annotation.Visible = true;
}
// Invalidated the area corresponding to the new annotation bounds.
this.Invalidate(newBounds);
}
/// <summary>
/// Creates a new control instance.
/// </summary>
public MapControl()
{
// Set the default properties.
this.DoubleBuffered = true;
// Create the background bitmap.
using (Graphics graphics = Graphics.FromImage(this.bitmapBackground))
{
using (SolidBrush brush = new SolidBrush(Color.LightGray))
{
// Draw the gray checker board.
graphics.FillRectangle(brush, 0, 0, 10, 10);
graphics.FillRectangle(brush, 10, 10, 20, 20);
// Draw the white checker board.
brush.Color = Color.White;
graphics.FillRectangle(brush, 10, 0, 20, 10);
graphics.FillRectangle(brush, 0, 10, 10, 20);
}
}
// Create the map annotations.
this.annotationMessage = new MapTextAnnotation(MapControl.messageNoMap, this, null);
this.annotationInfo = new MapInfoAnnotation(null, this, this);
this.annotations = new MapAnnotation[] {
this.annotationMessage,
this.annotationInfo
};
// Create the background brush.
this.brushBackground = new TextureBrush(this.bitmapBackground);
// Create the spring motion event handler.
this.scrollSpring.Tick += this.OnSpringTick;
// Create the marker collection event handlers.
this.markers.BeforeCleared += this.OnBeforeMarkersCleared;
this.markers.AfterItemInserted += this.OnAfterMarkerInserted;
this.markers.AfterItemRemoved += this.OnAfterMarkerRemoved;
this.markers.AfterItemSet += this.OnAfterMarkerSet;
// Create the grid font.
this.fontGrid = new Font(Window.DefaultFont.FontFamily, 7.0f);
}
/// <summary>
/// Refreshes the specified text annotation.
/// </summary>
/// <param name="annotation">The annotation.</param>
private void OnRefreshAnnotation(MapTextAnnotation annotation)
{
// If the annotation is visible.
if (annotation.Visible)
{
// Invalidate the area corresponding to the old annotation bounds.
this.Invalidate(annotation.Bounds);
// Refresh the annotation.
annotation.Refresh();
// Invalidate the area corresponding to the new annotation bounds.
this.Invalidate(annotation.Bounds);
}
}
/// <summary>
/// Hides the specified text annotation.
/// </summary>
/// <param name="annotation">The annotation.</param>
private void OnHideAnnotation(MapTextAnnotation annotation)
{
// If the annotation is visible.
if (annotation.Visible)
{
// Invalidate the area corresponding to the annotation bounds.
this.Invalidate(annotation.Bounds);
}
// Set the annotation visibility to false.
annotation.Visible = false;
}
