can toggle between paused and realtime

src/VisualEditor/runtime_types.ts

@@ -1,11 +1,3 @@
-// modal configuration: maps child-uid to modal configuration of the child
-// for OR-states, only the modal configuration of the current state is kept
-// for AND-states, the modal configuration of every child is kept
-// for basic states (= empty AND-states), the modal configuration is just an empty object
-// export type Mode = {[uid:string]: Mode};
-
-import { Transition } from "./ast";
-
 export type Timestamp = number; // milliseconds since begin of simulation
 export type Event = string;
 
@@ -20,12 +12,7 @@ export type RT_Statechart = {
   // history: // TODO
 }
 
-export type BigStep = {
-  from: RT_Statechart;
-  to: RT_Statechart;
-  inputEvent: string;
-  outputEvents: string[];
-}
+export type BigStep = RT_Statechart & {outputEvents: string[]};
 
 export type RaisedEvents = {
   internalEvents: string[];

src/VisualEditor/time.ts

@@ -0,0 +1,61 @@
+
+export type TimeMode = TimePaused | TimeRealTime;
+
+export type TimePaused = {
+  kind: "paused",
+  simtime: number, // the current simulated time
+}
+
+export type TimeRealTime = {
+  kind: "realtime",
+  scale: number, // time scale relative to wall-clock time
+  since: {
+    simtime: number,  // the simulated time at which the time was set to realtime
+    wallclktime: number, // the wall-clock time at which the time was set to realtime
+  }
+}
+
+export function getSimTime(currentMode: TimeMode, wallclktime: number): number {
+  if (currentMode.kind === "paused") {
+    return currentMode.simtime;
+  }
+  else {
+    const elapsedWallclk = wallclktime - currentMode.since.wallclktime;
+    return currentMode.since.simtime + currentMode.scale * elapsedWallclk;
+  }
+}
+
+export function setRealtime(currentMode: TimeMode, scale: number, wallclktime: number): TimeRealTime {
+  if (currentMode.kind === "paused") {
+    return {
+      kind: "realtime",
+      scale,
+      since: {
+        simtime: currentMode.simtime,
+        wallclktime,
+      },
+    };
+  }
+  else {
+    return {
+      kind: "realtime",
+      scale,
+      since: {
+        simtime: getSimTime(currentMode, wallclktime),
+        wallclktime,
+      },
+    };
+  }
+}
+
+export function setPaused(currentMode: TimeMode, wallclktime: number): TimePaused {
+  if (currentMode.kind === "paused") {
+    return currentMode; // no change
+  }
+  else {
+    return {
+      kind: "paused",
+      simtime: getSimTime(currentMode, wallclktime),
+    };
+  }
+}