如何选择圆形范围比较？

• 回答：

  通过圆形范围把两个控件里面不同的内容标记出来，首先需要动态画一个圆，具体实现js代码如下：

  
  

    function DoDynWorldDrawFun(dX, dY, pWorldDraw, pData) {
      var sGuid = pData.Guid;
      var ocx1 = document.getElementById("MxDrawXCtrl1");
      ocx1.SetEventRet(0);
      if (sGuid == "DrawCircle") {
          var pt1 = pData.GetPoint("pt1");
          if (pt1 == null)
              return;
          var pt2 = ocx1.NewPoint();
          pt2.x = dX;
          pt2.y = dY;
          var dR = pt1.DistanceTo(pt2);
          pWorldDraw.DrawCircle(pt1.x, pt1.y, dR);
      }
  
  }

  
  

  用户可以选取圆形范围内的图纸作比较，具体实现js代码如下：

  
  

  function CircleCompare() {
      var mxOcx  = document.getElementById("MxDrawXCtrl1");
      var getPt1 = mxOcx.NewComObject("IMxDrawUiPrPoint");
      getPt1.message = "指定圆心";
      if (getPt1.go() != 1) {
          return;
      }
      var getPt2 = mxOcx.NewComObject("IMxDrawUiPrPoint");
      getPt2.message = "指定圆上一点";
      getPt2.basePoint = getPt1.value();
      var spDrawData = getPt2.InitUserDraw("DrawCircle");
      spDrawData.SetPoint("pt1", getPt1.value());
      getPt2.setUseBasePt(true);
      if (getPt2.go() != 1) {
          return;
      }
      var cen = getPt1.value();
      var pt2 = getPt2.value();
      var dR = cen.DistanceTo(pt2);
      var circle = mxOcx.NewEntity("IMxDrawCircle");
      circle.Center = cen;
      circle.Radius = dR;
      var points = circle.GetSamplePoints(0.1);
  
      if (points.Count < 3) {
          alert("圆太小");
      }
      var filter = mxOcx.NewResbuf();
      DoImpCompare(points, filter);
  }