public static IPointCollection VectorArrowPoints(double beginPntX, double beginPntY, IMapPoint endPnt)
{
double x = beginPntX - endPnt.X;
double y = beginPntY - endPnt.Y;
double angle = Math.Atan2(y, x);
double alpha = Math.PI / 6; // arrow is 30 degree by each side of original line
double length = Math.Sqrt(x * x + y * y) * 0.25; // arrow is a quarter of original length
double x1 = endPnt.X + length * Math.Cos(angle + alpha);
double y1 = endPnt.Y + length * Math.Sin(angle + alpha);
double x2 = endPnt.X + length * Math.Cos(angle - alpha);
double y2 = endPnt.Y + length * Math.Sin(angle - alpha);
IMapPoint p1 = Runtime.geometryEngine.newMapPoint(x1, y1);
IMapPoint p2 = Runtime.geometryEngine.newMapPoint(x2, y2);
IPointCollection pc = Runtime.geometryEngine.newPointCollection();
pc.Add(p1);
pc.Add(endPnt);
pc.Add(p2);
return(pc);
}
// Draw horizontal distributed load
// Note: x1<x2, (x1,y1)-(x2,y1) is a horizontal line, (x1,y2)-(x2,y3) is a oblique line
//
public static IGraphicCollection DistributedLoad_Horizontal(double x1, double x2, double y1, double y2, double y3,
ISymbol backgroundFillSymbol, ISymbol arrowFillSymbol, ISymbol lineSymbol)
{
IGraphicCollection gc = Runtime.graphicEngine.newGraphicCollection();
IMapPoint p1 = Runtime.geometryEngine.newMapPoint(x1, y1);
IMapPoint p2 = Runtime.geometryEngine.newMapPoint(x1, y2);
IMapPoint p3 = Runtime.geometryEngine.newMapPoint(x2, y3);
IMapPoint p4 = Runtime.geometryEngine.newMapPoint(x2, y1);
IGraphic g = Runtime.graphicEngine.newQuadrilateral(p1, p2, p3, p4);
g.Symbol = backgroundFillSymbol;
gc.Add(g);
IPointCollection pc = Runtime.geometryEngine.newPointCollection();
pc.Add(p1);
pc.Add(p2);
pc.Add(p3);
pc.Add(p4);
pc.Add(p1);
g = Runtime.graphicEngine.newPolyline(pc);
g.Symbol = lineSymbol;
gc.Add(g);
double x00, y00, y01;
for (int i = 0; i <= 10; ++i)
{
x00 = x1 + i * (x2 - x1) / 10.0;
y00 = y1;
y01 = y2 + i * (y3 - y2) / 10.0;
IMapPoint p00 = Runtime.geometryEngine.newMapPoint(x00, y00);
IMapPoint p01 = Runtime.geometryEngine.newMapPoint(x00, y01);
g = Runtime.graphicEngine.newLine(p00, p01);
g.Symbol = lineSymbol;
gc.Add(g);
pc = GeomUtil.VectorArrowPoints(x00, y2, p00);
g = Runtime.graphicEngine.newPolygon(pc);
g.Symbol = arrowFillSymbol;
gc.Add(g);
}
return(gc);
}
void test()
{
IPointCollection pc = Runtime.geometryEngine.newPointCollection();
IMapPoint p1 = Runtime.geometryEngine.newMapPoint(0, 0);
IMapPoint p2 = Runtime.geometryEngine.newMapPoint(0, 100);
IMapPoint p3 = Runtime.geometryEngine.newMapPoint(100, 0);
pc.Add(p1);
pc.Add(p2);
pc.Add(p3);
IGraphicCollection gc = Runtime.graphicEngine.newGraphicCollection();
IGraphic g1 = Runtime.graphicEngine.newLine(p1, p2);
IGraphic g2 = Runtime.graphicEngine.newLine(p1, p3);
gc.Add(g1);
gc.Add(g2);
IEnvelope env = GraphicsUtil.GetGraphicsEnvelope(gc);
}
public static void Reverse(IPointCollection pts)
{
IEnumerable <IMapPoint> reversedPts = pts.Reverse();
IPointCollection newPts = Runtime.geometryEngine.newPointCollection();
foreach (IMapPoint pt in reversedPts)
{
newPts.Add(pt);
}
pts = Runtime.geometryEngine.newPointCollection();
foreach (IMapPoint pt in newPts)
{
pts.Add(pt);
}
}
public static void Reverse(IPointCollection pts)
{
IEnumerable<IMapPoint> reversedPts = pts.Reverse();
IPointCollection newPts = Runtime.geometryEngine.newPointCollection();
foreach (IMapPoint pt in reversedPts)
newPts.Add(pt);
pts = Runtime.geometryEngine.newPointCollection();
foreach (IMapPoint pt in newPts)
pts.Add(pt);
}