protected void AssignFastDrawnStates()
{
_drawnStatesNeeded = true;
_drawnStates = new FastDrawnState[DataSet.ShapeIndices.Count];
_selection = new IndexSelection(this); // update the new drawn-states;
_selection.Changed += SelectedFeaturesChanged;
// Fastest when no categories are used because we don't need DataTable at all
List<IFeatureCategory> categories = _scheme.GetCategories().ToList();
IFeatureCategory deflt = null;
if(categories.Count > 0 && categories[0].FilterExpression == null) deflt = categories[0];
for (int i = 0; i < DataSet.ShapeIndices.Count; i++)
{
_drawnStates[i] = new FastDrawnState();
_drawnStates[i].Category = deflt;
}
if(categories.Count == 1 && categories[0].FilterExpression == null) return;
bool containsFID = false;
DataTable table = DataSet.DataTable;
foreach (var category in categories)
{
if (category.FilterExpression != null && category.FilterExpression.Contains("[FID]"))
{
containsFID = true;
}
}
if(containsFID && table.Columns.Contains("FID") == false)
{
table.Columns.Add("FID");
for(int i = 0; i < table.Rows.Count; i++)
{
table.Rows[i]["FID"] = i;
}
}
foreach (var category in categories)
{
DataRow[] result = table.Select(category.FilterExpression);
foreach (DataRow row in result)
{
_drawnStates[table.Rows.IndexOf(row)].Category = category;
}
}
if(containsFID)table.Columns.Remove("FID");
}
// This draws the individual line features
private void DrawFeatures(MapArgs e, IEnumerable<int> indices)
{
Graphics g = e.Device ?? Graphics.FromImage(_backBuffer);
double minX = e.MinX;
double maxY = e.MaxY;
double dx = e.Dx;
double dy = e.Dy;
if(!DrawnStatesNeeded)
{
if(Symbology == null || Symbology.Categories.Count == 0) return;
FastDrawnState state = new FastDrawnState(false, Symbology.Categories[0]);
IPointCategory pc = state.Category as IPointCategory;
IPointSymbolizer ps = null;
if(pc != null && pc.Symbolizer !=null) ps = pc.Symbolizer;
if (ps == null) return;
g.SmoothingMode = ps.Smoothing ? SmoothingMode.AntiAlias : SmoothingMode.None;
double[] vertices = DataSet.Vertex;
foreach (int index in indices)
{
if(!DrawnStates[index].Visible) continue;
if(DataSet.FeatureType == FeatureTypes.Point)
{
System.Drawing.Point pt = new System.Drawing.Point();
pt.X = Convert.ToInt32((vertices[index * 2] - minX) * dx);
pt.Y = Convert.ToInt32((maxY - vertices[index * 2 + 1]) * dy);
double scaleSize = 1;
if (ps.ScaleMode == ScaleModes.Geographic)
{
scaleSize = e.ImageRectangle.Width / e.GeographicExtents.Width;
}
Matrix old = g.Transform;
Matrix shift = g.Transform;
shift.Translate(pt.X, pt.Y);
g.Transform = shift;
ps.Draw(g, scaleSize);
g.Transform = old;
}
else
{
// multi-point
ShapeRange range = DataSet.ShapeIndices[index];
for (int i = range.StartIndex; i <= range.EndIndex(); i++)
{
System.Drawing.Point pt = new System.Drawing.Point();
pt.X = Convert.ToInt32((vertices[i * 2 ] - minX) * dx);
pt.Y = Convert.ToInt32((maxY - vertices[i * 2 + 1]) * dy);
double scaleSize = 1;
if (ps.ScaleMode == ScaleModes.Geographic)
{
scaleSize = e.ImageRectangle.Width / e.GeographicExtents.Width;
}
Matrix old = g.Transform;
Matrix shift = g.Transform;
shift.Translate(pt.X, pt.Y);
g.Transform = shift;
ps.Draw(g, scaleSize);
g.Transform = old;
}
}
}
}
else
{
FastDrawnState[] states = DrawnStates;
double[] vertices = DataSet.Vertex;
foreach (IPointCategory category in Symbology.Categories)
{
if (category.Symbolizer == null) continue;
double scaleSize = 1;
if (category.Symbolizer.ScaleMode == ScaleModes.Geographic)
{
scaleSize = e.ImageRectangle.Width / e.GeographicExtents.Width;
}
Size2D size = category.Symbolizer.GetSize();
if (size.Width * scaleSize < 1 || size.Height * scaleSize < 1) continue;
Bitmap normalSymbol = new Bitmap((int)(size.Width * scaleSize), (int)(size.Height * scaleSize));
Graphics bg = Graphics.FromImage(normalSymbol);
bg.SmoothingMode = category.Symbolizer.Smoothing ? SmoothingMode.AntiAlias : SmoothingMode.None;
Matrix trans = bg.Transform;
trans.Translate((float)size.Width/2, (float)size.Height/2);
bg.Transform = trans;
category.Symbolizer.Draw(bg, 1);
Size2D selSize = category.SelectionSymbolizer.GetSize();
if (selSize.Width * scaleSize < 1 || selSize.Height * scaleSize < 1) continue;
Bitmap selectedSymbol = new Bitmap((int)(size.Width * scaleSize), (int)(size.Height * scaleSize));
Graphics sg = Graphics.FromImage(selectedSymbol);
sg.SmoothingMode = category.SelectionSymbolizer.Smoothing ? SmoothingMode.AntiAlias : SmoothingMode.None;
Matrix trans2 = bg.Transform;
trans2.Translate((float)size.Width / 2, (float)size.Height / 2);
sg.Transform = trans2;
category.Symbolizer.Draw(sg, 1);
foreach (int index in indices)
{
FastDrawnState state = states[index];
if (!state.Visible) continue;
if (state.Category == null) continue;
IPointCategory pc = state.Category as IPointCategory;
if (pc == null) continue;
if (pc != category) continue;
Bitmap bmp = normalSymbol;
if (state.Selected)
{
bmp = selectedSymbol;
}
if (DataSet.FeatureType == FeatureTypes.Point)
{
System.Drawing.Point pt = new System.Drawing.Point();
pt.X = Convert.ToInt32((vertices[index * 2] - minX) * dx);
pt.Y = Convert.ToInt32((maxY - vertices[index * 2 + 1]) * dy);
Matrix old = g.Transform;
Matrix shift = g.Transform;
shift.Translate(pt.X, pt.Y);
g.Transform = shift;
g.DrawImageUnscaled(bmp, -bmp.Width/2,-bmp.Height/2);
g.Transform = old;
}
else
{
ShapeRange range = DataSet.ShapeIndices[index];
for (int i = range.StartIndex; i <= range.EndIndex(); i++)
{
System.Drawing.Point pt = new System.Drawing.Point();
pt.X = Convert.ToInt32((vertices[i*2] - minX)*dx);
pt.Y = Convert.ToInt32((maxY - vertices[i*2 + 1])*dy);
Matrix old = g.Transform;
Matrix shift = g.Transform;
shift.Translate(pt.X, pt.Y);
g.Transform = shift;
g.DrawImageUnscaled(bmp, -bmp.Width / 2, -bmp.Height / 2);
g.Transform = old;
}
}
}
}
if (e.Device == null) g.Dispose();
}
}
private void BuildPaths(MapArgs e, IEnumerable<int> indices, out List<GraphicsPath> paths)
{
paths = new List<GraphicsPath>();
Extent drawExtents = new Extent(e.PixelToProj(_drawingBounds));
Dictionary<FastDrawnState, GraphicsPath> borders = new Dictionary<FastDrawnState, GraphicsPath>();
for (int selectState = 0; selectState < 2; selectState++)
{
foreach (IPolygonCategory category in Symbology.Categories)
{
FastDrawnState state = new FastDrawnState(selectState == 1, category);
GraphicsPath border = new GraphicsPath();
borders.Add(state, border);
paths.Add(border);
}
}
List<ShapeRange> shapes = DataSet.ShapeIndices;
double[] vertices = DataSet.Vertex;
if(!DrawnStatesNeeded)
{
FastDrawnState state = new FastDrawnState(false, Symbology.Categories[0]);
foreach (int shp in indices)
{
ShapeRange shape = shapes[shp];
if (!shape.Extent.Intersects(e.GeographicExtents)) continue;
if(shp >= shapes.Count) continue;
if (!borders.ContainsKey(state)) continue;
if (drawExtents.Contains(shape.Extent))
{
BuildPolygon(vertices, shapes[shp], borders[state], e, false);
}
else
{
BuildPolygon(vertices, shapes[shp], borders[state], e, true);
}
}
}
else
{
FastDrawnState[] states = DrawnStates;
foreach (int shp in indices)
{
if (shp >= shapes.Count) continue;
if (shp >= states.Length)
{
AssignFastDrawnStates();
states = DrawnStates;
}
if (states[shp].Visible == false) continue;
ShapeRange shape = shapes[shp];
if (!shape.Extent.Intersects(e.GeographicExtents)) continue;
if (drawExtents.Contains(shape.Extent))
{
FastDrawnState state = states[shp];
if (!borders.ContainsKey(state)) continue;
BuildPolygon(vertices, shapes[shp], borders[state], e, false);
}
else
{
FastDrawnState state = states[shp];
if (!borders.ContainsKey(state)) continue;
BuildPolygon(vertices, shapes[shp], borders[state], e, true);
}
}
}
}
