public override void Initialize(WorldWind.DrawArgs drawArgs)
{
lock (this)
{
m_oLastAoI = drawArgs.CurrentRoI;
m_oLastAoIChangeTime = DateTime.Now;
if (m_oGroundOverlay.Icon.ViewRefreshMode == KMLViewRefreshMode.onStop)
{
GeographicBoundingBox oRenderBox = GetNewBox(drawArgs.CurrentRoI, m_oGroundOverlay.Icon.ViewBoundScale);
m_oLayer = new ImageLayer(
m_oGroundOverlay.Name,
drawArgs.CurrentWorld,
m_oGroundOverlay.Altitude,
m_strImageFilename,
oRenderBox.South,
oRenderBox.North,
oRenderBox.West,
oRenderBox.East,
(byte)(m_oGroundOverlay.Color.A * ((double)m_opacity / (double)(byte.MaxValue))),
drawArgs.CurrentWorld.TerrainAccessor);
if (m_oGroundOverlay.Icon.IsLocalFile)
{
m_oLayer.ImagePath = Path.Combine(m_strKMLDirectory, m_oGroundOverlay.Icon.HRef);
}
else
{
m_oLayer.ImageUrl = m_oGroundOverlay.Icon.GetUri(oRenderBox.West, oRenderBox.South, oRenderBox.East, oRenderBox.North);
}
m_oLayerAoI = drawArgs.CurrentRoI.Clone() as GeographicBoundingBox;
}
else
{
m_oLayer = new ImageLayer(
m_oGroundOverlay.Name,
drawArgs.CurrentWorld,
m_oGroundOverlay.Altitude,
m_strImageFilename,
m_oGroundOverlay.LatLonBox.South,
m_oGroundOverlay.LatLonBox.North,
m_oGroundOverlay.LatLonBox.West,
m_oGroundOverlay.LatLonBox.East,
(byte)(m_oGroundOverlay.Color.A * ((double)m_opacity / (double)(byte.MaxValue))),
drawArgs.CurrentWorld.TerrainAccessor);
if (m_oGroundOverlay.Icon.IsLocalFile)
{
m_oLayer.ImagePath = Path.Combine(m_strKMLDirectory, m_oGroundOverlay.Icon.HRef);
}
else
{
m_oLayer.ImageUrl = m_oGroundOverlay.GetUri();
}
}
m_oLayer.Initialize(drawArgs);
}
}
public override void Update(WorldWind.DrawArgs drawArgs)
{
lock (this)
{
if (m_oLayer != null)
{
if (m_oGroundOverlay.Icon.ViewRefreshMode == KMLViewRefreshMode.onStop)
{
double dTimeStopped;
if (drawArgs.CurrentRoI.Equals(m_oLastAoI))
{
dTimeStopped = (DateTime.Now - m_oLastAoIChangeTime).Seconds;
}
else
{
dTimeStopped = 0.0;
m_oLastAoI = drawArgs.CurrentRoI;
m_oLastAoIChangeTime = DateTime.Now;
}
if (dTimeStopped > m_oGroundOverlay.Icon.ViewRefreshTime && !m_oLayerAoI.Equivalent(drawArgs.CurrentRoI, 1e-6))
{
try
{
File.Delete(m_strImageFilename);
}
catch (IOException) { return; }
GeographicBoundingBox oRenderBox = GetNewBox(drawArgs.CurrentRoI, m_oGroundOverlay.Icon.ViewBoundScale);
m_oLayer = new ImageLayer(
m_oGroundOverlay.Name,
drawArgs.CurrentWorld,
m_oGroundOverlay.Altitude,
m_strImageFilename,
oRenderBox.South,
oRenderBox.North,
oRenderBox.West,
oRenderBox.East,
(byte)(m_oGroundOverlay.Color.A * ((double)m_opacity / (double)(byte.MaxValue))),
drawArgs.CurrentWorld.TerrainAccessor);
if (m_oGroundOverlay.Icon.IsLocalFile)
{
m_oLayer.ImagePath = Path.Combine(m_strKMLDirectory, m_oGroundOverlay.Icon.HRef);
}
else
{
m_oLayer.ImageUrl = m_oGroundOverlay.Icon.GetUri(oRenderBox.West, oRenderBox.South, oRenderBox.East, oRenderBox.North);
}
m_oLayer.Initialize(drawArgs);
m_oLayerAoI = drawArgs.CurrentRoI.Clone() as GeographicBoundingBox;
}
}
m_oLayer.Update(drawArgs);
}
}
}
/// <summary>
/// 渲染当前图层
/// </summary>
/// <param name="drawArgs"></param>
public void Render(DrawArgs drawArgs)
{
if (imagelyr == null)
{
return;
}
if (!IsOn)
{
return;
}
if (!imagelyr.Initialized)
{
imagelyr.Initialize(drawArgs);
}
imagelyr.Render(drawArgs);
}