public Layer(string n)
{
name = n;
shapetype = ShapeType.EMPTY;
Visible = true;
Features = new Dictionary<int, Feature>();
Selected = new List<Feature>();
shapetype = ShapeType.EMPTY;
Style = new Style();
}
// draws arbitrary geometry
public void Draw(IGeometry ge, Graphics gr, Style c)
{
if (ge.GeometryType == "Polygon")
drawPolygon((Polygon)ge, gr, c);
if (ge.GeometryType == "MultiPolygon" || ge.GeometryType == "MultiLineString")
foreach(IGeometry g in ((IGeometryCollection)ge).Geometries)
Draw(g, gr, c);
if (ge.GeometryType == "LineString")
drawLine((LineString)ge, gr, c);
if (ge.GeometryType == "Point")
drawPoint((NTSPoint)ge, gr, c);
}
private void drawPoint(NTSPoint ge, Graphics gr, Style c)
{
float rad = Math.Max(1, c.pen.Width * 5 * (float)scale.X);
var mid = ScaleAndOffSet(ge);
gr.FillEllipse(c.brush, (int)(mid.X - rad), (int)(mid.Y - rad), (int)(rad*2), (int)(rad*2));
}
// draws polygon and then path around polygon
private void drawPolygon(Polygon ge, Graphics gr, Style c)
{
System.Drawing.Drawing2D.GraphicsPath gp = CreatePath(ge.ExteriorRing);
var hulls = ge.InteriorRings;
for (int h = 0; h < hulls.Count(); h++)
gp.AddPath(CreatePath(hulls[h]), false);
gp.FillMode = System.Drawing.Drawing2D.FillMode.Alternate;
gr.FillPath(c.brush, gp);
if (c.pen.Width > 0)
gr.DrawPath(c.pen, gp);
}
private void drawLine(LineString ge, Graphics gr, Style c)
{
var points = ge.Coordinates;
for (int i = 1; i < points.Count(); i++)
{
var a = ScaleAndOffSet(new NTSPoint(points[i - 1]));
var b = ScaleAndOffSet(new NTSPoint(points[i]));
gr.DrawLine(c.pen, (int)a.X, (int)a.Y, (int)b.X, (int)b.Y);
}
}
