Perpendicular lines at start and end of a line

Question

I have some lines. I want to draw perpendicular lines at the start and end of the lines, on both sides of the lines.

Can somebody help me in Python? Also, what are the variable settings of the script?

Answer 1

I have done something like this with arcObjects.

void DrawNormalOnPolyline(IPolyline polyline)
{
    IActiveView activeView = ArcMap.Document.ActiveView;
    double length = polyline.Length;
    ILine normalLine;
    normalLine = GetNormalOnPolylineFromStartPointToSpecificDistance(polyline, 0);//perpendicular line at start
    DrawLine(normalLine);
    normalLine = GetNormalOnPolylineFromStartPointToSpecificDistance(polyline, length);//perpendicular line at end
    DrawLine(normalLine);
    activeView.PartialRefresh(esriViewDrawPhase.esriViewGraphics, null, null);
}

ILine GetNormalOnPolylineFromStartPointToSpecificDistance(IPolyline polyline, double distance)
{
    double normalLineLength = 0.01;
    ILine normal = new Line();
    ICurve curve = polyline;
    curve.QueryNormal(esriSegmentExtension.esriNoExtension, distance, false, normalLineLength, normal);
    return normal;
}

void DrawLine (ILine normalLine)
{
    IElement element = null;
    IGraphicsContainer graphicsContainer = (IGraphicsContainer)ArcMap.Document.FocusMap;

    ILineElement lineElement = new LineElementClass();
    lineElement.Symbol = GetLineStyle();
    element = (IElement)lineElement; 

    if (!(element == null))
    {
        element.Geometry = GetLineGeometry(normalLine);
        graphicsContainer.AddElement(element, 0);
    }
}