raylib: show touches flag for debugging (#35671)

* show touches

* type

system/ui/lib/application.py

@@ -4,19 +4,21 @@ import os
 import time
 import pyray as rl
 from collections.abc import Callable
+from collections import deque
 from dataclasses import dataclass
 from enum import IntEnum
 from importlib.resources import as_file, files
 from openpilot.common.swaglog import cloudlog
 from openpilot.system.hardware import HARDWARE
 
-DEFAULT_FPS = 60
+DEFAULT_FPS = int(os.getenv("FPS", "60"))
 FPS_LOG_INTERVAL = 5  # Seconds between logging FPS drops
 FPS_DROP_THRESHOLD = 0.9  # FPS drop threshold for triggering a warning
 FPS_CRITICAL_THRESHOLD = 0.5  # Critical threshold for triggering strict actions
 
 ENABLE_VSYNC = os.getenv("ENABLE_VSYNC", "1") == "1"
 SHOW_FPS = os.getenv("SHOW_FPS") == '1'
+SHOW_TOUCHES = os.getenv("SHOW_TOUCHES") == '1'
 STRICT_MODE = os.getenv("STRICT_MODE") == '1'
 SCALE = float(os.getenv("SCALE", "1.0"))
 
@@ -61,6 +63,9 @@ class GuiApplication:
     self._trace_log_callback = None
     self._modal_overlay = ModalOverlay()
 
+    # Debug variables
+    self._mouse_history: deque[rl.Vector2] = deque(maxlen=DEFAULT_FPS * 2)
+
   def request_close(self):
     self._window_close_requested = True
 
@@ -190,6 +195,19 @@ class GuiApplication:
         if SHOW_FPS:
           rl.draw_fps(10, 10)
 
+        if SHOW_TOUCHES:
+          if rl.is_mouse_button_pressed(rl.MouseButton.MOUSE_BUTTON_LEFT):
+            self._mouse_history.clear()
+          self._mouse_history.append(rl.get_mouse_position())
+
+          if self._mouse_history:
+            mouse_pos = self._mouse_history[-1]
+            rl.draw_circle(int(mouse_pos.x), int(mouse_pos.y), 15, rl.RED)
+            for idx, mouse_pos in enumerate(self._mouse_history):
+              perc = idx / len(self._mouse_history)
+              color = rl.Color(min(int(255 * (1.5 - perc)), 255), int(min(255 * (perc + 0.5), 255)), 50, 255)
+              rl.draw_circle(int(mouse_pos.x), int(mouse_pos.y), 5, color)
+
         rl.end_drawing()
         self._monitor_fps()
     except KeyboardInterrupt: