1 /** Example 019 Mouse and Joystick
2
3 This tutorial builds on example 04.Movement which showed how to
4 handle keyboard events in Irrlicht. Here we'll handle mouse events
5 and joystick events, if you have a joystick connected and a device
6 that supports joysticks. These are currently Windows, Linux and SDL
7 devices.
8 */
9
10 #ifdef _MSC_VER
11 // We'll define this to stop MSVC complaining about sprintf().
12 #define _CRT_SECURE_NO_WARNINGS
13 #pragma comment(lib, "Irrlicht.lib")
14 #endif
15
16 #include <irrlicht.h>
17 #include "driverChoice.h"
18
19 using namespace irr;
20
21 /*
22 Just as we did in example 04.Movement, we'll store the latest state of the
23 mouse and the first joystick, updating them as we receive events.
24 */
25 class MyEventReceiver : public IEventReceiver
26 {
27 public:
28 // We'll create a struct to record info on the mouse state
29 struct SMouseState
30 {
31 core::position2di Position;
32 bool LeftButtonDown;
SMouseStateMyEventReceiver::SMouseState33 SMouseState() : LeftButtonDown(false) { }
34 } MouseState;
35
36 // This is the one method that we have to implement
OnEvent(const SEvent & event)37 virtual bool OnEvent(const SEvent& event)
38 {
39 // Remember the mouse state
40 if (event.EventType == irr::EET_MOUSE_INPUT_EVENT)
41 {
42 switch(event.MouseInput.Event)
43 {
44 case EMIE_LMOUSE_PRESSED_DOWN:
45 MouseState.LeftButtonDown = true;
46 break;
47
48 case EMIE_LMOUSE_LEFT_UP:
49 MouseState.LeftButtonDown = false;
50 break;
51
52 case EMIE_MOUSE_MOVED:
53 MouseState.Position.X = event.MouseInput.X;
54 MouseState.Position.Y = event.MouseInput.Y;
55 break;
56
57 default:
58 // We won't use the wheel
59 break;
60 }
61 }
62
63 // The state of each connected joystick is sent to us
64 // once every run() of the Irrlicht device. Store the
65 // state of the first joystick, ignoring other joysticks.
66 // This is currently only supported on Windows and Linux.
67 if (event.EventType == irr::EET_JOYSTICK_INPUT_EVENT
68 && event.JoystickEvent.Joystick == 0)
69 {
70 JoystickState = event.JoystickEvent;
71 }
72
73 return false;
74 }
75
GetJoystickState(void) const76 const SEvent::SJoystickEvent & GetJoystickState(void) const
77 {
78 return JoystickState;
79 }
80
GetMouseState(void) const81 const SMouseState & GetMouseState(void) const
82 {
83 return MouseState;
84 }
85
86
MyEventReceiver()87 MyEventReceiver()
88 {
89 }
90
91 private:
92 SEvent::SJoystickEvent JoystickState;
93 };
94
95
96 /*
97 The event receiver for keeping the pressed keys is ready, the actual responses
98 will be made inside the render loop, right before drawing the scene. So lets
99 just create an irr::IrrlichtDevice and the scene node we want to move. We also
100 create some other additional scene nodes, to show that there are also some
101 different possibilities to move and animate scene nodes.
102 */
main()103 int main()
104 {
105 // ask user for driver
106 video::E_DRIVER_TYPE driverType=driverChoiceConsole();
107 if (driverType==video::EDT_COUNT)
108 return 1;
109
110 // create device
111 MyEventReceiver receiver;
112
113 IrrlichtDevice* device = createDevice(driverType,
114 core::dimension2d<u32>(640, 480), 16, false, false, false, &receiver);
115
116 if (device == 0)
117 return 1; // could not create selected driver.
118
119
120 core::array<SJoystickInfo> joystickInfo;
121 if(device->activateJoysticks(joystickInfo))
122 {
123 std::cout << "Joystick support is enabled and " << joystickInfo.size() << " joystick(s) are present." << std::endl;
124
125 for(u32 joystick = 0; joystick < joystickInfo.size(); ++joystick)
126 {
127 std::cout << "Joystick " << joystick << ":" << std::endl;
128 std::cout << "\tName: '" << joystickInfo[joystick].Name.c_str() << "'" << std::endl;
129 std::cout << "\tAxes: " << joystickInfo[joystick].Axes << std::endl;
130 std::cout << "\tButtons: " << joystickInfo[joystick].Buttons << std::endl;
131
132 std::cout << "\tHat is: ";
133
134 switch(joystickInfo[joystick].PovHat)
135 {
136 case SJoystickInfo::POV_HAT_PRESENT:
137 std::cout << "present" << std::endl;
138 break;
139
140 case SJoystickInfo::POV_HAT_ABSENT:
141 std::cout << "absent" << std::endl;
142 break;
143
144 case SJoystickInfo::POV_HAT_UNKNOWN:
145 default:
146 std::cout << "unknown" << std::endl;
147 break;
148 }
149 }
150 }
151 else
152 {
153 std::cout << "Joystick support is not enabled." << std::endl;
154 }
155
156 core::stringw tmp = L"Irrlicht Joystick Example (";
157 tmp += joystickInfo.size();
158 tmp += " joysticks)";
159 device->setWindowCaption(tmp.c_str());
160
161 video::IVideoDriver* driver = device->getVideoDriver();
162 scene::ISceneManager* smgr = device->getSceneManager();
163
164 /*
165 We'll create an arrow mesh and move it around either with the joystick axis/hat,
166 or make it follow the mouse pointer. */
167 scene::ISceneNode * node = smgr->addMeshSceneNode(
168 smgr->addArrowMesh( "Arrow",
169 video::SColor(255, 255, 0, 0),
170 video::SColor(255, 0, 255, 0),
171 16,16,
172 2.f, 1.3f,
173 0.1f, 0.6f
174 )
175 );
176 node->setMaterialFlag(video::EMF_LIGHTING, false);
177
178 scene::ICameraSceneNode * camera = smgr->addCameraSceneNode();
179 camera->setPosition(core::vector3df(0, 0, -10));
180
181 // As in example 04, we'll use framerate independent movement.
182 u32 then = device->getTimer()->getTime();
183 const f32 MOVEMENT_SPEED = 5.f;
184
185 while(device->run())
186 {
187 // Work out a frame delta time.
188 const u32 now = device->getTimer()->getTime();
189 const f32 frameDeltaTime = (f32)(now - then) / 1000.f; // Time in seconds
190 then = now;
191
192 bool movedWithJoystick = false;
193 core::vector3df nodePosition = node->getPosition();
194
195 if(joystickInfo.size() > 0)
196 {
197 f32 moveHorizontal = 0.f; // Range is -1.f for full left to +1.f for full right
198 f32 moveVertical = 0.f; // -1.f for full down to +1.f for full up.
199
200 const SEvent::SJoystickEvent & joystickData = receiver.GetJoystickState();
201
202 // We receive the full analog range of the axes, and so have to implement our
203 // own dead zone. This is an empirical value, since some joysticks have more
204 // jitter or creep around the center point than others. We'll use 5% of the
205 // range as the dead zone, but generally you would want to give the user the
206 // option to change this.
207 const f32 DEAD_ZONE = 0.05f;
208
209 moveHorizontal =
210 (f32)joystickData.Axis[SEvent::SJoystickEvent::AXIS_X] / 32767.f;
211 if(fabs(moveHorizontal) < DEAD_ZONE)
212 moveHorizontal = 0.f;
213
214 moveVertical =
215 (f32)joystickData.Axis[SEvent::SJoystickEvent::AXIS_Y] / -32767.f;
216 if(fabs(moveVertical) < DEAD_ZONE)
217 moveVertical = 0.f;
218
219 // POV hat info is only currently supported on Windows, but the value is
220 // guaranteed to be 65535 if it's not supported, so we can check its range.
221 const u16 povDegrees = joystickData.POV / 100;
222 if(povDegrees < 360)
223 {
224 if(povDegrees > 0 && povDegrees < 180)
225 moveHorizontal = 1.f;
226 else if(povDegrees > 180)
227 moveHorizontal = -1.f;
228
229 if(povDegrees > 90 && povDegrees < 270)
230 moveVertical = -1.f;
231 else if(povDegrees > 270 || povDegrees < 90)
232 moveVertical = +1.f;
233 }
234
235 if(!core::equals(moveHorizontal, 0.f) || !core::equals(moveVertical, 0.f))
236 {
237 nodePosition.X += MOVEMENT_SPEED * frameDeltaTime * moveHorizontal;
238 nodePosition.Y += MOVEMENT_SPEED * frameDeltaTime * moveVertical;
239 movedWithJoystick = true;
240 }
241 }
242
243 // If the arrow node isn't being moved with the joystick, then have it follow the mouse cursor.
244 if(!movedWithJoystick)
245 {
246 // Create a ray through the mouse cursor.
247 core::line3df ray = smgr->getSceneCollisionManager()->getRayFromScreenCoordinates(
248 receiver.GetMouseState().Position, camera);
249
250 // And intersect the ray with a plane around the node facing towards the camera.
251 core::plane3df plane(nodePosition, core::vector3df(0, 0, -1));
252 core::vector3df mousePosition;
253 if(plane.getIntersectionWithLine(ray.start, ray.getVector(), mousePosition))
254 {
255 // We now have a mouse position in 3d space; move towards it.
256 core::vector3df toMousePosition(mousePosition - nodePosition);
257 const f32 availableMovement = MOVEMENT_SPEED * frameDeltaTime;
258
259 if(toMousePosition.getLength() <= availableMovement)
260 nodePosition = mousePosition; // Jump to the final position
261 else
262 nodePosition += toMousePosition.normalize() * availableMovement; // Move towards it
263 }
264 }
265
266 node->setPosition(nodePosition);
267
268 // Turn lighting on and off depending on whether the left mouse button is down.
269 node->setMaterialFlag(video::EMF_LIGHTING, receiver.GetMouseState().LeftButtonDown);
270
271 driver->beginScene(true, true, video::SColor(255,113,113,133));
272 smgr->drawAll(); // draw the 3d scene
273 driver->endScene();
274 }
275
276 /*
277 In the end, delete the Irrlicht device.
278 */
279 device->drop();
280
281 return 0;
282 }
283
284 /*
285 **/
286