UI/Info Icons

src/programs/http_client.ts

@@ -87,8 +87,18 @@ export class HttpClient extends ProgramBase {
       this.resource,
     );
 
+    srcDevice.showDeviceIcon(
+      "tcp-handshake",
+      "🤝",
+      "TCP handshake in progress",
+      Layer.App,
+    );
+
     // Write request
     const socket = await this.runner.tcpConnect(this.dstId);
+
+    srcDevice.hideDeviceIcon("tcp-handshake");
+
     if (!socket) {
       console.error("HttpClient failed to connect");
       showError(
@@ -185,7 +195,7 @@ export class HttpServer extends ProgramBase {
       );
       return;
     }
-
+    srcDevice.showHttpServerIcon();
     const listener = await this.runner.tcpListenOn(this.port);
     if (!listener) {
       showError(`Port ${this.port} already in use`);
@@ -203,6 +213,7 @@ export class HttpServer extends ProgramBase {
       this.serveClient(socket);
     }
     listener.close();
+    srcDevice.hideHttpServerIcon();
   }
 
   // eslint-disable-next-line @typescript-eslint/no-unused-vars

src/styles/alert.css

@@ -16,8 +16,7 @@
   border: 1px solid rgba(255, 255, 255, 0.2); /* Subtle border */
   max-width: 400px; /* Maximum width */
   line-height: 1.5; /* Line spacing */
-  font-family:
-    "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; /* Font family */
+  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
   opacity: 0; /* Initially transparent */
   transition:
     opacity 0.3s ease-in-out,

src/styles/tooltips.css

@@ -17,8 +17,7 @@
   max-width: 37.5rem; /* Maximum width in rem (600px / 16) */
   white-space: pre-wrap; /* Allow line breaks */
   line-height: 1.8; /* Line spacing */
-  font-family:
-    "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; /* Font family */
+  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
   overflow-y: auto; /* Enable scrolling for long content */
   opacity: 0.8; /* Slightly transparent */
   transition: opacity 0.2s ease-in-out; /* Smooth transition for opacity */

src/types/network-modules/tcp/tcpState.ts

@@ -9,6 +9,7 @@ import { AsyncQueue } from "../asyncQueue";
 import { SegmentWithIp } from "../tcpModule";
 import { GlobalContext } from "../../../context";
 import { CONFIG_SWITCH_KEYS } from "../../../config_menu/switches/switch_factory";
+import { Layer } from "../../layer";
 
 enum TcpStateEnum {
   CLOSED = 0,
@@ -714,6 +715,13 @@ export class TcpState {
         console.debug("[" + this.srcHost.id + "] [TCP] Processing timeout");
         retransmitPromise = this.retransmissionQueue.pop();
         // Retransmit the segment
+        this.srcHost.showDeviceIconFor(
+          "tcp_timeout",
+          "⏰",
+          "TCP Timeout",
+          2000,
+          Layer.Transport,
+        );
         this.resendPacket(result.seqNum, result.size);
         this.congestionControl.notifyTimeout();
         continue;

src/types/view-devices/vDevice.ts

@@ -6,6 +6,7 @@ import {
   TextStyle,
   Text,
   Container,
+  Ticker,
 } from "pixi.js";
 import { ViewGraph } from "../graphs/viewgraph";
 import {
@@ -15,7 +16,7 @@ import {
   urManager,
 } from "../viewportManager";
 import { RightBar } from "../../graphics/right_bar";
-import { Colors, ZIndexLevels } from "../../utils/utils";
+import { Colors, createDeviceIcon, ZIndexLevels } from "../../utils/utils";
 import { Position } from "../common";
 import { DeviceInfo } from "../../graphics/renderables/device_info";
 import {
@@ -68,6 +69,8 @@ export abstract class ViewDevice extends Container {
   private circleGraphic?: Graphics;
   private idLabel?: Text;
   private isVisibleFlag = true; // Flag to track visibility
+  private deviceIcons: Record<string, Text | undefined> = {};
+  private deviceTooltips: Record<string, Text | undefined> = {};
 
   readonly id: DeviceId;
   readonly viewgraph: ViewGraph;
@@ -190,6 +193,9 @@ export abstract class ViewDevice extends Container {
 
   updateDevicesAspect() {
     if (!this.isVisibleFlag) {
+      for (const iconKey in this.deviceIcons) {
+        this.hideDeviceIcon(iconKey);
+      }
       const edges = this.viewgraph
         .getConnections(this.id)
         .filter((e) => e.isVisible());
@@ -400,6 +406,90 @@ export abstract class ViewDevice extends Container {
     RightBar.getInstance().renderInfo(new DeviceInfo(this));
   }
 
+  private repositionDeviceIcons() {
+    const icons = Object.values(this.deviceIcons).filter(Boolean) as Text[];
+    if (icons.length === 0) return;
+
+    const spacing = 28;
+    const baseY = -this.height / 2 - 5;
+
+    const totalWidth = (icons.length - 1) * spacing;
+    icons.forEach((icon, idx) => {
+      icon.x = -totalWidth / 2 + idx * spacing;
+      icon.y = baseY;
+    });
+  }
+
+  showDeviceIconFor(
+    iconKey: string,
+    emoji: string,
+    tooltipText: string | undefined,
+    durationMs = 2000,
+    visibleFromLayer?: Layer,
+  ) {
+    this.showDeviceIcon(iconKey, emoji, tooltipText, visibleFromLayer);
+    let progress = 0;
+    const tick = (ticker: Ticker) => {
+      progress += ticker.elapsedMS * this.ctx.getCurrentSpeed();
+      if (progress >= durationMs) {
+        Ticker.shared.remove(tick, this);
+        this.hideDeviceIcon(iconKey);
+      }
+    };
+    Ticker.shared.add(tick, this);
+  }
+
+  showDeviceIcon(
+    iconKey: string,
+    emoji: string,
+    tooltipText?: string,
+    visibleFromLayer?: Layer,
+  ) {
+    if (
+      visibleFromLayer !== undefined &&
+      this.viewgraph.getLayer() > visibleFromLayer
+    ) {
+      return;
+    }
+    if (!this.isVisible()) return;
+    if (this.deviceIcons[iconKey]) return;
+    const icon = createDeviceIcon(emoji, 0);
+    this.deviceIcons[iconKey] = icon;
+
+    if (tooltipText) {
+      icon.on("pointerover", () => {
+        this.deviceTooltips[iconKey] = showTooltip(
+          this,
+          tooltipText,
+          0,
+          icon.y - 30,
+          this.deviceTooltips[iconKey],
+        );
+      });
+      icon.on("pointerout", () => {
+        hideTooltip(this.deviceTooltips[iconKey]);
+      });
+    }
+
+    this.addChild(icon);
+    this.repositionDeviceIcons();
+  }
+
+  hideDeviceIcon(iconKey: string) {
+    const icon = this.deviceIcons[iconKey];
+    if (icon) {
+      this.removeChild(icon);
+      icon.destroy();
+      this.deviceIcons[iconKey] = undefined;
+      this.repositionDeviceIcons();
+    }
+    const tooltip = this.deviceTooltips[iconKey];
+    if (tooltip) {
+      removeTooltip(this, tooltip);
+      this.deviceTooltips[iconKey] = undefined;
+    }
+  }
+
   select() {
     if (this.isDragCircle) return;
     this.highlight(); // Calls highlight on select

src/types/view-devices/vHost.ts

@@ -173,6 +173,14 @@ export class ViewHost extends ViewNetworkDevice {
     this.runningPrograms.clear();
   }
 
+  showHttpServerIcon() {
+    this.showDeviceIcon("httpServer", "🌐", "HTTP Server");
+  }
+
+  hideHttpServerIcon() {
+    this.hideDeviceIcon("httpServer");
+  }
+
   // TCP
 
   private tcpModule = new TcpModule(this);

src/types/view-devices/vNetworkDevice.ts

@@ -210,6 +210,7 @@ export abstract class ViewNetworkDevice extends ViewDevice {
         // drop packet
         const frame = new EthernetFrame(mac, sha, packet);
         dropPacket(this.viewgraph, this.id, frame);
+        this.showDeviceIconFor("arpDrop", "⛔", "ARP dropped");
         return;
       }
       // Send an ARP Reply to the requesting device

src/types/view-devices/vRouter.ts

@@ -183,6 +183,7 @@ export class ViewRouter extends ViewNetworkDevice {
     }
     if (!this.packetQueue.enqueue(datagram)) {
       console.debug("Packet queue full, dropping packet");
+      this.showDeviceIconFor("queueFull", "❗", "Queue full");
       this.dropPacket(datagram);
       return;
     }
@@ -255,7 +256,7 @@ export class ViewRouter extends ViewNetworkDevice {
       return;
     }
 
-    const result = device.routingTable.all().find((entry) => {
+    const result = device.routingTable.allActive().find((entry) => {
       const ip = IpAddress.parse(entry.ip);
       const mask = IpAddress.parse(entry.mask);
       return datagram.destinationAddress.isInSubnet(ip, mask);

src/types/view-devices/vSwitch.ts

@@ -78,6 +78,7 @@ export class ViewSwitch extends ViewDevice {
       }
       if (device instanceof DataSwitch) {
         device.updateForwardingTable(mac, iface);
+        this.showDeviceIconFor("update-ftable", "🔄", "Table Updated");
       }
     });
   }
@@ -107,6 +108,8 @@ export class ViewSwitch extends ViewDevice {
     this.updateForwardingTable(frame.source, iface);
     if (frame.payload instanceof ArpRequest) {
       const { sha, spa, tha, tpa } = frame.payload;
+
+      this.showDeviceIconFor("broadcast", "📢", "Broadcast");
       this.interfaces.forEach((sendingIface, idx) => {
         const packet = new ArpRequest(sha, spa, tpa, tha);
         const frame = new EthernetFrame(
@@ -137,6 +140,10 @@ export class ViewSwitch extends ViewDevice {
             { length: getNumberOfInterfaces(this.getType()) },
             (_, i) => i,
           );
+
+    if (sendingIfaces.length > 1) {
+      this.showDeviceIconFor("broadcast", "📢", "Broadcast");
+    }
     sendingIfaces.forEach((sendingIface) =>
       this.forwardFrame(frame, sendingIface, iface),
     );

src/utils/utils.ts

@@ -1,4 +1,11 @@
-import { Application, GraphicsContext, RenderTexture } from "pixi.js";
+import {
+  Application,
+  GraphicsContext,
+  RenderTexture,
+  Container,
+  TextStyle,
+  Text,
+} from "pixi.js";
 import { Viewport } from "../graphics/viewport";
 import { ALERT_MESSAGES } from "./constants/alert_constants";
 import { showError } from "../graphics/renderables/alert_manager";
@@ -82,3 +89,50 @@ export function captureAndDownloadViewport(
     link.click();
   }, "image/png");
 }
+
+export function blockPointerEvents(obj: Container) {
+  obj.on("pointerdown", (e) => e.stopPropagation());
+  obj.on("pointerup", (e) => e.stopPropagation());
+  obj.on("pointerupoutside", (e) => e.stopPropagation());
+  obj.on("pointertap", (e) => e.stopPropagation());
+  obj.on("pointermove", (e) => e.stopPropagation());
+  obj.on("click", (e) => e.stopPropagation());
+}
+
+/**
+ * Creates a PixiJS emoji icon centered above the device.
+ * @param emoji The emoji or text to display (e.g., "🌐")
+ * @param yOffset Vertical offset from the center of the device (e.g., -this.height / 2 - 5)
+ * @param fontSize Font size (optional, default 20)
+ * @returns A Pixi.Text instance ready to be added as a child
+ */
+export function createDeviceIcon(
+  emoji: string,
+  yOffset: number,
+  fontSize = 20,
+): Text {
+  const textStyle = new TextStyle({
+    fontSize,
+  });
+
+  const icon = new Text({ text: emoji, style: textStyle });
+  icon.anchor.set(0.5, 1);
+  icon.x = 1;
+  icon.y = yOffset;
+  icon.zIndex = 100;
+  icon.eventMode = "static";
+  icon.interactive = true;
+  icon.cursor = "pointer";
+
+  blockPointerEvents(icon);
+  return icon;
+}
+
+/**
+ * Changes the emoji/text of a PixiJS Text icon.
+ * @param icon The Pixi.Text instance.
+ * @param emoji The emoji or text to display.
+ */
+export function setIconEmoji(icon: Text, emoji: string) {
+  icon.text = emoji;
+}