display functionality

LemmingSim.html

@@ -46,6 +46,8 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
           </td>
           <td>Sensor values<span id="SensorLabel"></span></td>
         </tr>
+        <tr><th colspan="2" align="center">Display</th></tr>
+        <tr><td colspan="2" id="bayDisplay"></td></tr>
       </tbody></table>
   </body>
 </html>

lemming_sim_student.js

@@ -108,21 +108,29 @@ class Lemming extends Robot {
             block = 'blue'
         }
         const {distL, distR, wallL, wallR} = vals
+        this.block = block
         if (distL < wallL - 5 || distR < wallR - 5) {
+            this.state = 'block'
             // if it senses a block
             if (!block) return this.drive(2e-4) // no block: drive towards block?
             if (block == 'blue') void 0; // if blue: ignore
             if (block == 'red') return this.turnDeg(-90) // if red: leave block
         } else if (wallL < Infinity || wallR < Infinity) {
+            this.state = 'wall'
             // no block: turn left or right
             if (!block) return this.turnDeg(90 * (Math.random() < 0.5 ? -1 : 1))
             if (block == 'blue') return this.turnDeg(-90) // blue: leave
             if (block == 'red') return this.turnDeg(90) // red: keep
+        } else {
+            this.state = 'nothing'
         }
         // by default: wander
-        this.rotate(+0.002);
+        this.rotate(+0.001);
         this.drive(0.0002);
     }
+    getDisplay() {
+        return "carrying " + this.block + "\nseeing " + this.state
+    }
 }
 var sim = null
 class Simulation {
@@ -319,6 +327,7 @@ class Bay {
             }).join('')
                                                   
             document.getElementById('SensorLabel').innerHTML = sensorString;
+            document.getElementById('bayDisplay').innerHTML = robot.getDisplay()
         }
     }
     transformMouse({x,y}) {
@@ -374,6 +383,9 @@ Object.assign(Robot.prototype, {
          */
         this.body.torque = torque;
     },
+    getDisplay() {
+        return ""
+    },
     
     drive(force=0) {
         /* Apply a force to the robot to move it.