/// <summary> Handles the click on the map. </summary>
/// <param name="sender"> The sender of the MouseDown event. </param>
/// <param name="e"> The event parameters. </param>
private void map_MouseDown(object sender, MouseButtonEventArgs e)
{
if (!(e.ChangedButton == MouseButton.Left && e.ButtonState == MouseButtonState.Pressed))
{
return;
}
// get clicked coordinate and transform to PTV Mercator
var canvasPoint = e.GetPosition(this);
var mercatorPoint = CanvasToPtvMercator(canvasPoint);
// ctrl-key adds the selected polygon
if (!(Keyboard.IsKeyDown(Key.LeftCtrl) || Keyboard.IsKeyDown(Key.RightCtrl)))
{
geometries.Clear();
}
// query the items for a point (which is a rectangle of size 0)
foreach (var geoItem in provider.QueryBBox(mercatorPoint.X, mercatorPoint.Y, mercatorPoint.X, mercatorPoint.Y, null))
{
// parse the geometry from the wkb to a WPF path
// transform to canvas coordinates
var geometry = WkbToWpf.Parse(geoItem.Wkb, PtvMercatorToCanvas);
// The result set conains all geometries whose *envelope* contains the point.
// Check for exact containment
if (geometry.FillContains(canvasPoint))
{
geometries.Add(geometry);
}
}
}
