//构造垂直线上点法
private void button9_Click(object sender, EventArgs e)
{
delFeature("point");
IPoint[] points = new IPoint[2];
for (int i = 0; i < 2; i++)
{
points[i] = new PointClass();
}
points[0].PutCoords(0, 0);
points[1].PutCoords(20, 0);
ISegment segment;
ILine line = new LineClass();
line.FromPoint = points[0];
line.ToPoint = points[1];
segment = line as ISegment;
IPoint fromPoint = new PointClass();
fromPoint.X = points[0].X + 10;
fromPoint.Y = points[0].Y + 10;
IConstructPoint constructPoint = new PointClass();
constructPoint.ConstructPerpendicular(segment, esriSegmentExtension.esriNoExtension, fromPoint, 3, false);
addFeature("point", points[0]);
addFeature("point", points[1]);
addFeature("point", constructPoint as IPoint);
axMapControl1.Refresh();
}
static public List <IPolyline> CreatePerpendicularLine(FeaPtInform fptClass, IFeatureLayer plyFeatureLyr, bool isValOrRige)
{
IPoint pt1 = CreateAngleBisectorPt(fptClass, plyFeatureLyr, isValOrRige);
ILine AngleBisectorLine = new LineClass();
AngleBisectorLine.FromPoint = fptClass.PtCoord;
AngleBisectorLine.ToPoint = pt1;
IConstructPoint constructPt = new PointClass();
double m = 100;
if (isValOrRige == true)
{
m = 150;
}
constructPt.ConstructPerpendicular(AngleBisectorLine as ISegment, esriSegmentExtension.esriNoExtension, AngleBisectorLine.FromPoint, m, false);
IPoint newpt = constructPt as IPoint;
ILine beforeLine = new LineClass();
beforeLine.FromPoint = fptClass.PtCoord;
beforeLine.ToPoint = newpt;
IPolyline leftPly = new PolylineClass();
leftPly.FromPoint = fptClass.PtCoord;
leftPly.ToPoint = newpt;
IPolyline temperply = new PolylineClass();
temperply = ExtendLineFun(beforeLine.FromPoint, beforeLine.Angle - Math.PI);
IPolyline rightPly = new PolylineClass();
rightPly.FromPoint = fptClass.PtCoord;
rightPly.ToPoint = temperply.ToPoint;
List <IPolyline> buildPerpendicularLine = new List <IPolyline>();
buildPerpendicularLine.Add(leftPly);
buildPerpendicularLine.Add(rightPly);
return(buildPerpendicularLine);
}
