To Zoom in to an AutoCAD Entity

The AutoCAD JavaScript API tutorial demonstrates how you can implement a command in AutoCAD to zoom to the extents of a selected entity.

1. Use the following JavaScript code to create a command to zoom to the extents of a selected entity:

   // Command to zoom to the extents of a selected entity
   
   function zoomEntity() {
     try {
       
       // Set the options for our user prompt
   
       var peo = new Acad.PromptEntityOptions();
       peo.setMessageAndKeywords("\nSelect an entity", "");
       peo.allowObjectOnLockedLayer = true;
   
       // Ask the user to select an entity
   
       Acad.Editor.getEntity(peo).then(onComplete, onError);
     }
     catch(e) {
       console.log(e.message);
     }
   }
   
   function onComplete(jsonPromptResult) {
     try {
       
       // Parse the JSON string containing the prompt result
   
       var resultObj = JSON.parse(jsonPromptResult);
       if (resultObj && resultObj.status == 5100) {
         
         // If it was successful, get the selected entity...
   
         var entity = new Acad.DBEntity(resultObj.objectId);
   
         // ... and its extents
   
         var ext = entity.getExtents();
   
         // Zoom to the object's extents, choosing to animate the
         // view transition (if possible to do so)
   
         Acad.Editor.CurrentViewport.zoomExtents(
           ext.minPoint3d, ext.maxPoint3d, true
         );
       }
     }
     catch(e) {
       console.log(e.message); 
     }
   }
   
   function onError(jsonPromptResult) {
     console.log("\nProblem encountered.");
   }
   
   // Add the command, we'll make it transparent
   
   Acad.Editor.addCommand(
     "ZOOM_CMDS",
     "ZEN",
     "ZEN",
     Acad.CommandFlag.TRANSPARENT,
     zoomEntity
   );
   
   console.log("\nRegistered ZEN command.\n");

   NoteSave the file as ZoomEntity.js.
2. Register the domain from where you want to load the JavaScript file using the TRUSTEDDOMAINS sysvar.

   (setvar "TRUSTEDDOMAINS" (strcat 
   (getvar "TRUSTEDDOMAINS") ";mywesbite.com"))

3. Use the WEBLOAD command in AutoCAD to load the ZoomEntity.js file.

   (command "_.WEBLOAD" 
   "http://mywebsite.com/files/ZoomEntity.js")

4. Execute the ZEN command from the command line to zoom to an entity.