1 files changed, 80 insertions, 0 deletions
diff --git a/src/core/time-controller.js b/src/core/time-controller.js
new file mode 100644
index 0000000..7cd57c7
--- /dev/null
+++ b/src/core/time-controller.js
@@ -0,0 +1,80 @@
+export class TimeController {
+    constructor(store) {
+        this.store = store;
+        this.lastFrameTime = performance.now();
+    }
+
+    tick(now = performance.now()) {
+        const deltaMs = now - this.lastFrameTime;
+        this.lastFrameTime = now;
+
+        this.store.setState((state) => {
+            const realElapsedMs = state.time.realElapsedMs + deltaMs;
+            const plotDeltaMs = state.time.paused ? 0 : deltaMs * state.time.speed;
+
+            return {
+                ...state,
+                time: {
+                    ...state.time,
+                    realNowMs: Date.now(),
+                    realElapsedMs,
+                    plotTimeMs: Math.max(0, state.time.plotTimeMs + plotDeltaMs),
+                },
+            };
+        });
+
+        return deltaMs;
+    }
+
+    togglePause() {
+        this.store.setState((state) => ({
+            ...state,
+            time: {
+                ...state.time,
+                paused: !state.time.paused,
+            },
+        }));
+    }
+
+    setPaused(paused) {
+        this.store.setState((state) => ({
+            ...state,
+            time: {
+                ...state.time,
+                paused,
+            },
+        }));
+    }
+
+    setSpeed(speed) {
+        const clampedSpeed = Math.max(0.1, Math.min(12, speed));
+        this.store.setState((state) => ({
+            ...state,
+            time: {
+                ...state.time,
+                speed: clampedSpeed,
+            },
+        }));
+    }
+
+    reset() {
+        this.store.setState((state) => ({
+            ...state,
+            time: {
+                ...state.time,
+                realElapsedMs: 0,
+                plotTimeMs: 0,
+            },
+            plot: {
+                ...state.plot,
+                hoveredPoint: null,
+                tooltip: {
+                    ...state.plot.tooltip,
+                    visible: false,
+                    point: null,
+                },
+            },
+        }));
+        this.lastFrameTime = performance.now();
+    }
+}