mobeil controls

webui/src/components/MobileControls/FloatingJoystick.jsx

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+// Floating on-screen joystick used for mobile driving.
+import { useCallback, useEffect, useRef, useState } from 'react';
+import { clampUnit } from '../../controls/controlMath.js';
+
+export default function FloatingJoystick({ disabled, layout, radius, onMove, onStop }) {
+  const containerRef = useRef(null);
+  const pointerIdRef = useRef(null);
+  const baseRef = useRef({ x: 0, y: 0 });
+  const [visual, setVisual] = useState({ active: false, base: { x: 0, y: 0 }, knob: { x: 0, y: 0 } });
+
+  const stopTracking = useCallback(() => {
+    pointerIdRef.current = null;
+    setVisual({ active: false, base: { x: 0, y: 0 }, knob: { x: 0, y: 0 } });
+    onStop?.();
+  }, [onStop]);
+
+  const handlePointerDown = useCallback(
+    (event) => {
+      if (disabled) return;
+      if (pointerIdRef.current !== null) return;
+      event.preventDefault();
+      const container = containerRef.current;
+      if (!container) return;
+      const rect = container.getBoundingClientRect();
+      const x = event.clientX - rect.left;
+      const y = event.clientY - rect.top;
+      baseRef.current = { x, y };
+      pointerIdRef.current = event.pointerId;
+      container.setPointerCapture?.(event.pointerId);
+      setVisual({ active: true, base: { x, y }, knob: { x: 0, y: 0 } });
+    },
+    [disabled],
+  );
+
+  const handlePointerMove = useCallback(
+    (event) => {
+      if (disabled || pointerIdRef.current !== event.pointerId) return;
+      event.preventDefault();
+      const container = containerRef.current;
+      if (!container) return;
+      const rect = container.getBoundingClientRect();
+      const currentX = event.clientX - rect.left;
+      const currentY = event.clientY - rect.top;
+      const dx = currentX - baseRef.current.x;
+      const dy = currentY - baseRef.current.y;
+      const distance = Math.min(Math.hypot(dx, dy), radius);
+      const angle = Math.atan2(dy, dx);
+      const knobX = Math.cos(angle) * distance;
+      const knobY = Math.sin(angle) * distance;
+      const vector = {
+        x: clampUnit(knobX / radius),
+        y: clampUnit(-knobY / radius),
+        boost: false,
+      };
+      setVisual((prev) => ({ ...prev, knob: { x: knobX, y: knobY } }));
+      onMove?.(vector);
+    },
+    [disabled, onMove, radius],
+  );
+
+  const handlePointerEnd = useCallback(
+    (event) => {
+      if (pointerIdRef.current !== event.pointerId) return;
+      event.preventDefault();
+      const container = containerRef.current;
+      container?.releasePointerCapture?.(event.pointerId);
+      stopTracking();
+    },
+    [stopTracking],
+  );
+
+  useEffect(() => {
+    if (disabled) stopTracking();
+  }, [disabled, stopTracking]);
+
+  const heightClass = 'h-full';
+
+  return (
+    <div
+      ref={containerRef}
+      role="presentation"
+      className={`relative w-full ${heightClass} select-none overflow-hidden rounded-xl border-2 border-slate-700 bg-slate-900/70 text-slate-100 shadow-md`}
+      style={{ touchAction: 'none' }}
+      onPointerDown={handlePointerDown}
+      onPointerMove={handlePointerMove}
+      onPointerUp={handlePointerEnd}
+      onPointerLeave={handlePointerEnd}
+      onPointerCancel={handlePointerEnd}
+      onContextMenu={(event) => event.preventDefault()}
+    >
+      {!visual.active && (
+        <div className="absolute inset-x-0 top-0 flex flex-col items-center gap-0 text-center pt-0.5">
+          <span className="font-semibold text-slate-200">Joystick area</span>
+          <span className="text-sm text-slate-300">Touch and hold to use the joystick</span>
+        </div>
+      )}
+      {visual.active && (
+        <>
+          <div
+            className="pointer-events-none absolute h-28 w-28 -translate-x-1/2 -translate-y-1/2 bg-cyan-400/10 outline outline-2 outline-cyan-400/60 [clip-path:circle(50%)]"
+            style={{ left: visual.base.x, top: visual.base.y }}
+          />
+          <div
+            className="pointer-events-none absolute h-12 w-12 -translate-x-1/2 -translate-y-1/2 bg-cyan-300/80 shadow-lg [clip-path:circle(50%)]"
+            style={{
+              left: visual.base.x + visual.knob.x,
+              top: visual.base.y + visual.knob.y,
+            }}
+          />
+        </>
+      )}
+    </div>
+  );
+}