//构造圆弧点
private void button1_Click(object sender, EventArgs e)
{
delFeature("point");
//构造一段圆弧
IPoint centerPoint = new PointClass();
centerPoint.PutCoords(10, 0);
IPoint fromPoint = new PointClass();
fromPoint.PutCoords(0, 0);
IPoint toPoint = new PointClass();
toPoint.PutCoords(0, 20);
IConstructCircularArc circularArcConstruction = new CircularArcClass();
circularArcConstruction.ConstructThreePoints(fromPoint, centerPoint, toPoint, false);
//构造圆弧点
IConstructMultipoint constructMultipoint = new MultipointClass();
constructMultipoint.ConstructArcPoints(circularArcConstruction as ICircularArc);
IPointCollection pointCollection = constructMultipoint as IPointCollection;
for (int i = 0; i < pointCollection.PointCount; i++)
{
addFeature("point", pointCollection.get_Point(i));
}
axMapControl1.Refresh();
}