public void Render(object sender, IDrawArgs drawArgs)
{
if (_cntLines == null || _cntLines.Length == 0 || _contourClassItems == null || _contourClassItems.Length == 0)
{
return;
}
if (_canvas == null)
{
_canvas = sender as ICanvas;
_canvasSizeChanged = new EventHandler(Container_SizeChanged);
_canvas.OnEnvelopeChanged += _canvasSizeChanged;
_conflictor = new PixelConflictor(_canvas.Container.Size);
}
CoordEnvelope evp = _canvas.CurrentEnvelope;
_crtCanvasEnvelope = new ContourLine.ContourEnvelope((float)evp.MinX, (float)evp.MaxX, (float)evp.MinY, (float)evp.MaxY);
TryUpdateLabelBuffers(drawArgs);
TryProject();
TrySetSmoothMode(drawArgs);
TryResetConflictor();
float minWidth = MIN_WIDTH * _canvas.ResolutionX;
float minHeight = MIN_WIDTH * _canvas.ResolutionY;
ContourLine.ContourEnvelope thisEvp = null;
int classIdx = 0;
ContourClass cntClass = null;
foreach (ContourLine cntLine in _cntLines)
{
if (cntLine == null)
{
continue;
}
classIdx = cntLine.ClassIndex;
cntClass = _contourClassItems[classIdx];
thisEvp = cntLine.Envelope;
//如果不在可视区域则绘制
if (!_crtCanvasEnvelope.IsInteractived(thisEvp))
{
continue;
}
//如果在当前比例尺下太小则不显示
if (thisEvp.Width > minWidth || thisEvp.Height > minHeight)
{
DrawContour(drawArgs, cntLine, cntClass, _canvas);
}
}
}
