/// <summary>
/// Notifies change.
/// </summary>
public void TriggerRendering(bool force)
{
// notify map layout of changes.
if (this.Width > 0 && this.Height > 0)
{
// create the view.
View2D view = _renderer.Create(this.Width, this.Height,
this.Map, (float)this.Map.Projection.ToZoomFactor(this.MapZoom),
this.MapCenter, false, true);
// notify the map that the view has changed.
this.Map.ViewChanged((float)this.Map.Projection.ToZoomFactor(this.MapZoom), this.MapCenter,
view);
_mapView.NotifyMapChange(this.Width, this.Height, view, this.Map.Projection);
this.SetOrtho(view);
// build the layers list.
var layers = new List <Layer>();
for (int layerIdx = 0; layerIdx < this.Map.LayerCount; layerIdx++)
{
// get the layer.
layers.Add(this.Map[layerIdx]);
}
_renderer.Render(_target,
layers,
view,
(float)this.Map.Projection.ToZoomFactor(this.MapZoom));
}
}
/// <summary>
/// Raises the draw event.
/// </summary>
/// <param name="canvas">Canvas.</param>
protected override void OnDraw(global::Android.Graphics.Canvas canvas)
{
try
{
base.OnDraw(canvas);
if (_renderingSuspended)
{ // do nothing when rendering is suspended.
return;
}
// set the height/width.
if (_surfaceHeight != canvas.Height ||
_surfaceWidth != canvas.Width)
{
_surfaceHeight = canvas.Height;
_surfaceWidth = canvas.Width;
// make sure markers are in the correct position too.
_mapView.NotifyMapChange(this.SurfaceWidth, this.SurfaceHeight, this.CreateView(), this.Map.Projection);
// trigger rendering.
this.TriggerRendering();
// raise map initialized.
_mapView.RaiseMapInitialized();
}
if (_onScreenBuffer != null)
{ // there is a buffer.
// render only the cached scene.
canvas.DrawColor(new global::Android.Graphics.Color(_backgroundColor));
View2D view = this.CreateView();
float zoomFactor = (float)this.Map.Projection.ToZoomFactor(this.MapZoom);
_renderer.SceneRenderer.Render(
canvas,
view,
zoomFactor,
new Primitive2D[] { _onScreenBuffer });
}
}
catch (Exception ex)
{
OsmSharp.Logging.Log.TraceEvent("MapViewSurface", TraceEventType.Critical,
string.Format("An unhandled exception occured:{0}", ex.ToString()));
}
}
/// <summary>
/// Notifies that there was movement.
/// </summary>
private void NotifyMovement()
{
// invalidate the current view.
this.Invalidate();
// notify map layout of changes.
if (this.Width > 0 && this.Height > 0)
{
View2D view = _cacheRenderer.Create(this.Width, this.Height,
this.Map, (float)this.Map.Projection.ToZoomFactor(this.MapZoomLevel),
this.MapCenter, _invertX, _invertY);
_mapLayout.NotifyMapChange(this.Width, this.Height, view, this.Map.Projection);
}
}
/// <summary>
/// Notifies that there was movement.
/// </summary>
private void NotifyMovement()
{
// invalidate the current view.
this.Invalidate();
// notify map layout of changes.
if (this.SurfaceWidth > 0 && this.SurfaceHeight > 0)
{
// create the current view.
View2D view = this.CreateView();
// notify map change to reposition markers.
_mapView.NotifyMapChange(this.SurfaceWidth, this.SurfaceHeight, view, this.Map.Projection);
// notify listener.
_listener.NotifyChange(view, this.MapZoom);
}
}