private unsafe void DrawContour(IDrawArgs drawArgs, ContourLine cntLine, ContourClass cntClass, ICanvas canvas)
{
if (!cntClass.IsDisplay)
{
return;
}
ICoordinateTransform tran = canvas.CoordTransform;
int nCount = cntLine.Count;
PointF[] pts = new PointF[nCount];
GCHandle dstHandle = GCHandle.Alloc(pts, GCHandleType.Pinned);
GCHandle srcHandle = GCHandle.Alloc(cntLine.Points, GCHandleType.Pinned);
try
{
MemoryCopy(dstHandle.AddrOfPinnedObject(), srcHandle.AddrOfPinnedObject(), nCount << _pointfSize); // nCount * sizeof(PointF)
QuickTransform quickTran = drawArgs.QuickTransformArgs;
fixed(PointF *ptr0 = pts)
{
PointF *ptr = ptr0;
for (int i = 0; i < nCount; i++, ptr++)
{
quickTran.Transform(ptr);
}
}
Graphics g = drawArgs.Graphics as Graphics;
//
if (_isUseCurveRender)
{
g.DrawCurve(cntClass.Pen, pts, _tension);
}
else
{
_grahpicPath.Reset();
_grahpicPath.AddLines(pts);
g.DrawPath(cntClass.Pen, _grahpicPath);
}
//
if (_isLabel)
{
if (_isCheckConflicting)
{
if (_conflictor.IsConflicted(pts[0], cntClass.LabelBuffer.Size))
{
return;
}
_conflictor.HoldPosition(pts[0], cntClass.LabelBuffer.Size);
}
g.DrawImageUnscaled(cntClass.LabelBuffer, (int)pts[0].X, (int)pts[0].Y);
}
}
finally
{
dstHandle.Free();
srcHandle.Free();
}
}
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);
}
}
}
protected override object CreateAndFillObject(XElement propertyXml)
{
List <ContourClass> ccs = new List <ContourClass>();
var itemElements = propertyXml.Elements("ContourClass");
foreach (XElement itemElement in itemElements)
{
double contourValue = AttToDouble(itemElement, "contourvalue");
bool isdisplay = AttToBool(itemElement, "isdisplay");
float linewidth = AttToFloat(itemElement, "linewidth");
Color contourColor = Color.Black;
XElement cElement = itemElement.Element("ContourColor");
if (cElement != null)
{
ColorPropertyConverter c = new ColorPropertyConverter();
contourColor = (Color)c.FromXml(cElement);
}
ContourClass cc = new ContourClass(contourValue, contourColor, linewidth);
ccs.Add(cc);
}
return(ccs.Count > 0 ? ccs.ToArray() : null);
}