在网页中如何绘制自定义实体？

• 回答：

  调用DrawCustomEntity函数，绘制一个自定义实体对象。

  
  

  下面代码绘制一个自定义实体，设置了两个属性，属性名分别“startpoint”,“endpoint”的两个点坐标，js代码实现如下：

  
  

  //绘制自定义实体
  function DyInsertCustomEntity() {
      //清空当前显示内容
      mxOcx.NewFile();
      var getPt = mxOcx.NewComObject("IMxDrawUiPrPoint");
      getPt.message = "点取第一点";
      if (getPt.go() != 1)
          return;
      var frstPt = getPt.value();
      if (frstPt == null)
          return;
      var getSecondPt = mxOcx.NewComObject("IMxDrawUiPrPoint");
      getSecondPt.message = "点取第二点";
      getSecondPt.basePoint = frstPt;
      getSecondPt.setUseBasePt(true);
      if (getSecondPt.go() != 1)
          return;
      var secondPt = getSecondPt.value();
      if (secondPt == null)
          return;
      var ent = mxOcx.DrawCustomEntity("TestMxCustomEntity", "");
      ent.SetPoint("spt", frstPt);
      ent.SetPoint("ept", secondPt);
  }

  
  

  需要响应DMxDrawXEvents::CustomEntity_Explode事件。

  
  

  下面例子，得到自实体的数据，js代码实现如下：

  
  

  // 自定义实体绘制函数
  function ExplodeFun(pCustomEntity, pWorldDraw, txt) {
      var sGuid = pCustomEntity.Guid;
      if (sGuid == "TestMxCustomEntity") {
          if (!pCustomEntity.IsHave("ept"))
              return;
          var stp = pCustomEntity.GetPoint("spt");
          if (stp == null)
              return;
          var ept = pCustomEntity.GetPoint("ept");
          if (ept == null)
              return;
          var mxUtility = mxOcx.NewUtility();
          var vec = ept.SumVector(stp);
          vec.Mult(0.5);
          var midPt = mxOcx.NewPoint();
          midPt.x = stp.x;
          midPt.y = stp.y;
          midPt.Add(vec);
          var dAng = vec.Angle();
          //计算一个标注角度，使用文字对象始终头朝上
          dAng = mxUtility.GetDimAngle(dAng);
          var dDis = 0.0;
          dDis = stp.DistanceTo(ept);
          var sTxt = "L=" + formatNumber(dDis, '#.##');
          dAng = dAng * 180.0 / 3.14159265;
          vec.RotateByXyPlan(3.14159265 / 2.0);
          vec.Normalize();
          vec.Mult(10);
          stp.Add(vec);
          ept.Add(vec);
          pWorldDraw.DrawLine(stp.x, stp.y, ept.x, ept.y);
          vec.Mult(2);
          stp.Sum(vec);
          ept.Sum(vec);
          pWorldDraw.DrawLine(stp.x, stp.y, ept.x, ept.y);
          pWorldDraw.SetColorIndex(1);
          pWorldDraw.DrawText(midPt.x, midPt.y, sTxt, 5, dAng,
              1, 2);
          mxOcx.SetEventRet(1);
  
      }
     
  
  }

  
  

  需要响应_DMxDrawXEvents::CustomEntity_getGripPoints事件，js代码实现如下：

  
  

  // 返回自定义实体夹点
  function GetGripPointsFun(pCustomEntity) {
      var sGuid = pCustomEntity.Guid;
      
      //自定义实体绘制两条直线
      if (sGuid == "TestMxCustomEntity") {
          if (!pCustomEntity.IsHave("ept"))
              return;
  
          var stp = pCustomEntity.GetPoint("spt");
          if (stp == null)
              return;
  
          var ept = pCustomEntity.GetPoint("ept");
          if (ept == null)
              return;
  
          var ret = mxOcx.NewResbuf();
  
          ret.AddPoint(stp);
          ret.AddPoint(ept);
  
          mxOcx.SetEventRetEx(ret);
      }
      
      
  }

  
  

  需要响应CustomEntity_moveGripPointsAt事件。

  
  

  下面例子，夹点移动后，修改自定义实体的属性，js代码实现如下：

  
  

  // 移动自定义实体夹点
  function MoveGripPointsFun(pCustomEntity, lGridIndex, dOffsetX, dOffsetY) {
  
      var sGuid = pCustomEntity.Guid;
     
      if (sGuid == "TestMxCustomEntity") {
          if (!pCustomEntity.IsHave("ept"))
              return;
  
          var stp = pCustomEntity.GetPoint("spt");
          if (stp == null)
              return;
  
          var ept = pCustomEntity.GetPoint("ept");
          if (ept == null)
              return;
  
  
          if (lGridIndex == 0) {
              stp.x = stp.x + dOffsetX;
              stp.y = stp.y + dOffsetY;
              pCustomEntity.SetPoint("spt", stp);
          }
          else {
              ept.x = ept.x + dOffsetX;
              ept.y = ept.y + dOffsetY;
              pCustomEntity.SetPoint("ept", ept);
          }
  
          mxOcx.SetEventRet(1);
      }
      
  }