Added another example showing usage of wheel devices

samples/gamepad/steeringWheel.py

@@ -0,0 +1,139 @@
+#!/usr/bin/env python
+'''
+Demonstrate usage of steering wheels
+
+In this sample you can use a wheel type device to control the camera and
+show some messages on screen.  You can acclerate forward using the
+accleration pedal and slow down using the break pedal.
+'''
+
+from direct.showbase.ShowBase import ShowBase
+from panda3d.core import TextNode, InputDevice, loadPrcFileData, Vec3
+from direct.gui.OnscreenText import OnscreenText
+
+loadPrcFileData("", "notify-level-device debug")
+
+class App(ShowBase):
+    def __init__(self):
+        ShowBase.__init__(self)
+        # print all events sent through the messenger
+        self.messenger.toggleVerbose()
+
+        self.lblWarning = OnscreenText(
+            text = "No devices found",
+            fg=(1,0,0,1),
+            scale = .25)
+        self.lblWarning.hide()
+
+        self.lblAction = OnscreenText(
+            text = "Action",
+            fg=(1,1,1,1),
+            scale = .15)
+        self.lblAction.hide()
+
+        self.checkDevices()
+
+        self.currentMoveSpeed = 0.0
+        self.maxAccleration = 28.0
+        self.deaccleration = 10.0
+        self.deaclerationBreak = 37.0
+        self.maxSpeed = 80.0
+
+        # Accept device dis-/connection events
+        # NOTE: catching the events here will overwrite the accept in showbase, hence
+        #       we need to forward the event in the functions we set here!
+        self.accept("connect-device", self.connect)
+        self.accept("disconnect-device", self.disconnect)
+
+        self.accept("escape", exit)
+        self.accept("flight_stick0-start", exit)
+
+        # Accept button events of the first connected steering wheel
+        self.accept("steering_wheel0-action_a", self.doAction, extraArgs=[True, "Action"])
+        self.accept("steering_wheel0-action_a-up", self.doAction, extraArgs=[False, "Release"])
+
+        self.environment = loader.loadModel("environment")
+        self.environment.reparentTo(render)
+
+        self.wheelCenter = 0
+        wheels = base.devices.getDevices(InputDevice.DC_steering_wheel)
+        if len(wheels) > 0:
+            for i in range(wheels[0].getNumControls()):
+                if wheels[0].getControlMap(i) == InputDevice.C_wheel:
+                    self.wheelCenter = wheels[0].getControlState(i)
+
+        # disable pandas default mouse-camera controls so we can handle the camera
+        # movements by ourself
+        self.disableMouse()
+        base.camera.setZ(2)
+
+        self.taskMgr.add(self.moveTask, "movement update task")
+
+    def connect(self, device):
+        # we need to forward the event to the connectDevice function of showbase
+        self.connectDevice(device)
+        # Now we can check for ourself
+        self.checkDevices()
+
+    def disconnect(self, device):
+        # we need to forward the event to the disconnectDevice function of showbase
+        self.disconnectDevice(device)
+        # Now we can check for ourself
+        self.checkDevices()
+
+    def checkDevices(self):
+        # check if we have wheel devices connected
+        if self.devices.get_devices(InputDevice.DC_steering_wheel):
+            # we have at least one steering wheel device
+            self.lblWarning.hide()
+        else:
+            # no devices connected
+            self.lblWarning.show()
+
+    def doAction(self, showText, text):
+        if showText and self.lblAction.isHidden():
+            self.lblAction.show()
+        else:
+            self.lblAction.hide()
+
+    def moveTask(self, task):
+        dt = globalClock.getDt()
+        movementVec = Vec3()
+
+        wheels = base.devices.getDevices(InputDevice.DC_steering_wheel)
+        if len(wheels) == 0:
+            # savety check
+            return task.cont
+
+        if self.currentMoveSpeed > 0:
+            self.currentMoveSpeed -= dt * self.deaccleration
+            if self.currentMoveSpeed < 0:
+                self.currentMoveSpeed = 0
+
+        # we will use the first found wheel
+        for i in range(wheels[0].getNumControls()):
+
+            if wheels[0].getControlMap(i) == InputDevice.C_accelerator:
+                accleration = wheels[0].getControlState(i) * self.maxAccleration
+                self.currentMoveSpeed += dt * accleration
+
+                if self.currentMoveSpeed > wheels[0].getControlState(i) * self.maxSpeed:
+                    self.currentMoveSpeed -= dt * self.deaccleration
+            elif wheels[0].getControlMap(i) == InputDevice.C_brake:
+                deacleration = wheels[0].getControlState(i) * self.deaclerationBreak
+                self.currentMoveSpeed -= dt * deacleration
+
+            elif self.currentMoveSpeed < 0:
+                self.currentMoveSpeed = 0
+
+            if wheels[0].getControlMap(i) == InputDevice.C_wheel:
+                rotation = self.wheelCenter - wheels[0].getControlState(i)
+                base.camera.setH(base.camera, 100 * dt * rotation)
+
+        # calculate movement
+        base.camera.setY(base.camera, dt * self.currentMoveSpeed)
+
+        return task.cont
+
+app = App()
+app.run()