/// <summary>
/// Renders the map using the provided <see cref="T:System.Drawing.Graphics" /> object.
/// Uses custom <see cref="LayerCollectionRendererThrowsException"/> in order to honor WmsLayer property ContinueOnError.
/// If ContinueOnError is false, an exception will be thrown.
/// If ContinueOnErrror is true, a red X will be drawn instead of the layer.
/// </summary>
/// <param name="g">the <see cref="T:System.Drawing.Graphics" /> object to use</param>
/// <exception cref="T:System.ArgumentNullException">if <see cref="T:System.Drawing.Graphics" /> object is null.</exception>
/// <exception cref="T:System.InvalidOperationException">if there are no layers to render.</exception>
public new void RenderMap(Graphics g)
{
OnMapRendering(g);
if (g == null)
{
throw new ArgumentNullException("g", "Cannot render map with null graphics object!");
}
//Pauses the timer for VariableLayer
VariableLayerCollection.Pause = true;
if ((Layers == null || Layers.Count == 0) && (BackgroundLayer == null || BackgroundLayer.Count == 0) && (VariableLayers == null || VariableLayers.Count == 0))
{
throw new InvalidOperationException("No layers to render");
}
lock (MapTransform)
{
g.Transform = MapTransform.Clone();
}
g.Clear(BackColor);
g.PageUnit = GraphicsUnit.Pixel;
double zoom = Zoom;
double scale = double.NaN; //will be resolved if needed
ILayer[] layerList;
if (BackgroundLayer != null && BackgroundLayer.Count > 0)
{
layerList = new ILayer[BackgroundLayer.Count];
BackgroundLayer.CopyTo(layerList, 0);
foreach (ILayer layer in layerList)
{
if (layer.VisibilityUnits == VisibilityUnits.Scale && double.IsNaN(scale))
{
scale = MapScale;
}
double visibleLevel = layer.VisibilityUnits == VisibilityUnits.ZoomLevel ? zoom : scale;
OnLayerRendering(layer, LayerCollectionType.Background);
if (layer.Enabled)
{
if (layer.MaxVisible >= visibleLevel && layer.MinVisible < visibleLevel)
{
LayerCollectionRendererThrowsException.RenderLayer(layer, g, this);
}
}
OnLayerRendered(layer, LayerCollectionType.Background);
}
}
if (Layers != null && Layers.Count > 0)
{
layerList = new ILayer[Layers.Count];
Layers.CopyTo(layerList, 0);
//int srid = (Layers.Count > 0 ? Layers[0].SRID : -1); //Get the SRID of the first layer
foreach (ILayer layer in layerList)
{
if (layer.VisibilityUnits == VisibilityUnits.Scale && double.IsNaN(scale))
{
scale = MapScale;
}
double visibleLevel = layer.VisibilityUnits == VisibilityUnits.ZoomLevel ? zoom : scale;
OnLayerRendering(layer, LayerCollectionType.Static);
if (layer.Enabled && layer.MaxVisible >= visibleLevel && layer.MinVisible < visibleLevel)
{
LayerCollectionRendererThrowsException.RenderLayer(layer, g, this);
}
OnLayerRendered(layer, LayerCollectionType.Static);
}
}
if (VariableLayers != null && VariableLayers.Count > 0)
{
layerList = new ILayer[VariableLayers.Count];
VariableLayers.CopyTo(layerList, 0);
foreach (ILayer layer in layerList)
{
if (layer.VisibilityUnits == VisibilityUnits.Scale && double.IsNaN(scale))
{
scale = MapScale;
}
double visibleLevel = layer.VisibilityUnits == VisibilityUnits.ZoomLevel ? zoom : scale;
if (layer.Enabled && layer.MaxVisible >= visibleLevel && layer.MinVisible < visibleLevel)
{
LayerCollectionRendererThrowsException.RenderLayer(layer, g, this);
}
}
}
#pragma warning disable 612,618
RenderDisclaimer(g);
#pragma warning restore 612,618
// Render all map decorations
foreach (var mapDecoration in Decorations)
{
mapDecoration.Render(g, this);
}
//Resets the timer for VariableLayer
VariableLayerCollection.Pause = false;
OnMapRendered(g);
}