ArcEngine生成矩形缓冲区

这里生成缓冲区肯定是根据点进行生成的，说是生成缓冲区其实是根据点生成面。具体思路如下：
首先根据点获取要生成矩形缓冲区的四个顶点的坐标，然后将这四个点生成面即可得到所谓的矩形缓冲区。

//首先获取要生成缓冲区的点
IPoint pPoint = new PointClass();
pPoint.X = cPointList[i].point.X;
pPoint.Y = cPointList[i].point.Y;
//获取生成的缓冲区的四个顶点的坐标
IPointCollection pPC = new MultipointClass();
for (int j = 0; j < 4; j++)
{
IPoint pPoint1 = new PointClass();
if (j == 0)
{
pPoint1.X = pPoint.X - 2.55;
pPoint1.Y = pPoint.Y - 2.55;
}
if (j == 1)
{
pPoint1.X = pPoint.X - 2.55;
pPoint1.Y = pPoint.Y + 2.55;
} if (j == 2)
{
pPoint1.X = pPoint.X + 2.55;
pPoint1.Y = pPoint.Y + 2.55;
} if (j == 3)
{
pPoint1.X = pPoint.X + 2.55;
pPoint1.Y = pPoint.Y - 2.55;
}
pPC.AddPoint(pPoint1);
}
IGeometryCollection pGeometryCollection = new PolygonClass();
Ring ring = new RingClass(http://www.my516.com);
object missing = Type.Missing;
ring.AddPointCollection(Points);
pGeometryCollection.AddGeometry(ring as IGeometry, ref missing, ref missing);
IPolygon polyGonGeo = pGeometryCollection as IPolygon;
polyGonGeo.Close();
polyGonGeo.SimplifyPreserveFromTo();
pGeo =polyGonGeo as IGeometry;
//创建要素
pFeatureBuffer = pFeaClaPolygon.CreateFeatureBuffer();
pFeatureBuffer.Shape = pGeo;
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结果图：下图为点生成矩形缓冲区的最终成果。

这个是融合之后的图形。

当然在进行顶点坐标输入的时候需要按照顺序，不然就会出现下边这种情况：
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