/// <summary>
/// Creates a RasterizingLayer which rasterizes a layer for performance
/// </summary>
/// <param name="layer">The Layer to be rasterized</param>
/// <param name="delayBeforeRasterize">Delay after viewport change to start rerasterising</param>
/// <param name="renderResolutionMultiplier"></param>
/// <param name="rasterizer">Rasterizer to use. null will use the default</param>
/// <param name="overscanRatio">The ratio of the size of the rasterized output to the current viewport</param>
/// <param name="onlyRerasterizeIfOutsideOverscan">
/// Set the rerasterization policy. false will trigger a Rerasterisation on
/// every viewport change. true will trigger a Rerasterisation only if the viewport moves outside the existing
/// rasterisation.
/// </param>
public RasterizingLayer(ILayer layer, int delayBeforeRasterize = 500, double renderResolutionMultiplier = 1,
IRenderer rasterizer = null, double overscanRatio = 1, bool onlyRerasterizeIfOutsideOverscan = false)
{
if (overscanRatio < 1)
throw new ArgumentException($"{nameof(overscanRatio)} must be >= 1", nameof(overscanRatio));
_layer = layer;
Name = layer.Name;
_delayBeforeRasterize = delayBeforeRasterize;
_renderResolutionMultiplier = renderResolutionMultiplier;
_rasterizer = rasterizer;
_timer = new Timer(TimerElapsed, null, _delayBeforeRasterize, int.MaxValue);
_timer.Stop();
_layer.DataChanged += LayerOnDataChanged;
_cache = new MemoryProvider();
_overscan = overscanRatio;
_onlyRerasterizeIfOutsideOverscan = onlyRerasterizeIfOutsideOverscan;
}
public ImageLayer(string layername)
{
Name = layername;
StartFetchTimer = new Timer(StartFetchTimerElapsed, null, 500, int.MaxValue);
NumberOfFeaturesReturned = 1;
}
public override void ViewChanged(bool majorChange, BoundingBox extent, double resolution)
{
if (!Enabled) return;
if (DataSource == null) return;
if (!majorChange) return;
NewExtent = extent;
NewResolution = resolution;
if (IsFetching)
{
NeedsUpdate = true;
return;
}
StartFetchTimer.Dispose();
StartFetchTimer = new Timer(StartFetchTimerElapsed, null, 500, int.MaxValue);
}
public void AddFeatures(IEnumerable<IFeature> features)
{
var previousCache = _cache;
_cache = ConvertToAnimatedItems(features.ToList(), previousCache, IdField);
_startTimeAnimation = DateTime.Now.Ticks / TimeSpan.TicksPerMillisecond;
if (_animation != null) StopAnimation();
_animation = new Timer(AnimationCallback, this, 0, MillisecondsBetweenUpdates);
_first = true;
}
private void StopAnimation()
{
_animation.Stop();
_animation.Dispose();
_animation = null;
}
public AnimatedPointsWithAutoUpdateLayer()
: base(new DynamicMemoryProvider())
{
Style = new SymbolStyle {Fill = {Color = new Color(255, 215, 0, 200)}, SymbolScale = 0.9};
_timer = new Timer(arg => UpdateData(), this, 0, 2000);
}