/// <summary>
/// Raises the mousemove event.
/// </summary>
/// <param name="e"></param>
protected override void OnMouseMove(MouseEventArgs e)
{
base.OnMouseMove(e);
var currentCoordinates = new double[] { e.X, e.Y };
if (this.MapAllowPan &&
e.Button == MouseButtons.Left &&
_draggingCoordinates != null)
{
var delta = new double[] { _draggingCoordinates[0] - currentCoordinates[0],
(_draggingCoordinates[1] - currentCoordinates[1]) };
var newCenter = new double[] { this.Width / 2.0f + delta[0], this.Height / 2.0f + delta[1] };
this.MapCenter = _oldCenter;
View2D view = _renderer.Create(this.Width, this.Height, this.Map,
(float)this.Map.Projection.ToZoomFactor(this.MapZoom), this.MapCenter, false, true);
double x, y;
var fromMatrix = view.CreateFromViewPort(this.Width, this.Height);
fromMatrix.Apply(newCenter[0], newCenter[1], out x, out y);
// project to new center.
this.MapCenter = this.Map.Projection.ToGeoCoordinates(x, y);
// notify the map.
this.QueueNotifyMapViewChanged();
}
this.RaiseOnMapMouseMove(e);
}
/// <summary>
/// Transforms the canvas to the coordinate system of the view.
/// </summary>
/// <param name="view"></param>
/// <param name="target"></param>
protected override void Transform(Target2DWrapper <global::Android.Graphics.Canvas> target, View2D view)
{
_view = view;
_target = target;
_toViewPort = _view.CreateToViewPort(_target.Width, _target.Height);
_fromViewPort = _view.CreateFromViewPort(_target.Width, _target.Height);
}
/// <summary>
/// Raises the OnMapMouseDoubleClick event.
/// </summary>
/// <param name="e"></param>
private void RaiseOnMapMouseDoubleClick(MouseEventArgs e)
{
if (this.Map != null)
{
View2D view = _renderer.Create(this.Width, this.Height, this.Map,
(float)this.Map.Projection.ToZoomFactor(this.MapZoom), this.MapCenter, false, true);
// get scene coordinates.
double x, y;
var fromMatrix = view.CreateFromViewPort(this.Width, this.Height);
fromMatrix.Apply(e.X, e.Y, out x, out y);
var geoCoordinates = this.Map.Projection.ToGeoCoordinates(x, y);
// create map user control event args.
var args = new MapControlEventArgs(e, geoCoordinates);
this.OnMapMouseDoubleClick(args);
if (MapMouseDoubleClick != null)
{
MapMouseDoubleClick(args);
}
}
}
/// <summary>
/// Utility method for ensuring a view stays within a bounding box of geo coordinated.
/// </summary>
/// <param name="center">The map center we want to move to.</param>
/// <param name="boundingBox">A GeoCoordinateBox defining the bounding box.</param>
/// <param name="view" The current view.</param>
/// <returns>Returns a center geo coordinate that is corrected so the view stays within the bounding box.</returns>
public GeoCoordinate EnsureViewWithinBoundingBox(GeoCoordinate center, GeoCoordinateBox boundingBox, View2D view)
{
double[] mapCenterSceneCoords = this.Projection.ToPixel(center);
var toViewPort = view.CreateToViewPort(view.Width, view.Height);
double mapCenterPixelsX, mapCenterPixelsY;
toViewPort.Apply(mapCenterSceneCoords[0], mapCenterSceneCoords[1], out mapCenterPixelsX, out mapCenterPixelsY);
//double[] mapCenterPixels = view.ToViewPort(view.Width, view.Height, mapCenterSceneCoords[0], mapCenterSceneCoords[1]);
var fromViewPort = view.CreateFromViewPort(view.Height, view.Width);
double leftScene, topScene, rightScene, bottomScene;
fromViewPort.Apply(mapCenterPixelsX - (view.Width) / 2.0, mapCenterPixelsY - (view.Height) / 2.0, out leftScene, out topScene);
//double[] topLeftSceneCoordinates = view.FromViewPort(view.Width,
// view.Height,
// mapCenterPixels[0] - (view.Width) / 2.0,
// mapCenterPixels[1] - (view.Height) / 2.0);
GeoCoordinate topLeft = this.Projection.ToGeoCoordinates(leftScene, topScene);
//GeoCoordinate topLeft = this.Projection.ToGeoCoordinates(topLeftSceneCoordinates[0], topLeftSceneCoordinates[1]);
fromViewPort.Apply(mapCenterPixelsX + (view.Width) / 2.0, mapCenterPixelsY + (view.Height) / 2.0, out rightScene, out bottomScene);
//double[] bottomRightSceneCoordinates = view.FromViewPort(view.Width,
// view.Height,
// mapCenterPixels[0] + (view.Width) / 2.0,
// mapCenterPixels[1] + (view.Height) / 2.0);
GeoCoordinate bottomRight = this.Projection.ToGeoCoordinates(rightScene, bottomScene);
// Early exit when the view is inside the box.
if (boundingBox.Contains(topLeft) && boundingBox.Contains(bottomRight))
{
return(center);
}
double viewNorth = topLeft.Latitude;
double viewEast = bottomRight.Longitude;
double viewSouth = bottomRight.Latitude;
double viewWest = topLeft.Longitude;
double boxNorth = boundingBox.MaxLat;
double boxEast = boundingBox.MaxLon;
double boxSouth = boundingBox.MinLat;
double boxWest = boundingBox.MinLon;
//TODO: Check if the view acrually fits the bounding box, if not resize the view.
// Correct all view bounds if neccecary.
if (viewNorth > boxNorth)
{
viewSouth -= viewNorth - boxNorth;
viewNorth = boxNorth;
}
if (viewEast > boxEast)
{
viewWest -= viewEast - boxEast;
viewEast = boxEast;
}
if (viewSouth < boxSouth)
{
viewNorth += boxSouth - viewSouth;
viewSouth = boxSouth;
}
if (viewWest < boxWest)
{
viewEast += boxWest - viewWest;
viewWest = boxWest;
}
// Compute and return corrected map center
return(new GeoCoordinate(viewSouth + (viewNorth - viewSouth) / 2.0f, viewWest + (viewEast - viewWest) / 2.0f));
}