Uhhh... so why don't we just put it in the tutorial code itself?
Code: Select all
Index: examples/04.Movement/main.cpp
===================================================================
--- examples/04.Movement/main.cpp (revision 1185)
+++ examples/04.Movement/main.cpp (working copy)
@@ -14,54 +14,40 @@
#pragma comment(lib, "Irrlicht.lib")
/*
-In this tutorial, one of our goals is to move a scene node using some
-keys on the keyboard. We store a pointer to the scene node we want to
-move with the keys here.
-The other pointer is a pointer to the Irrlicht Device, which we need
-int the EventReceiver to manipulate the scene node and to get the
-active camera.
-*/
-
-scene::ISceneNode* node = 0;
-IrrlichtDevice* device = 0;
-
-
-/*
-To get events like mouse and keyboard input, or GUI events like
-"the OK button has been clicked", we need an object wich is derived from the
+To receive events like mouse and keyboard input, or GUI events like
+"the OK button has been clicked", we need an object which is derived from the
IEventReceiver object. There is only one method to override: OnEvent.
-This method will be called by the engine when an event happened.
-We will use this input to move the scene node with the keys W and S.
+This method will be called by the engine once when an event happens.
+What we really want to know is whether a key is being held down,
+and so we will remember the current state of each key.
*/
class MyEventReceiver : public IEventReceiver
{
public:
+ // This is the one method that we have to implement
virtual bool OnEvent(const SEvent& event)
{
- /*
- If the key 'W' or 'S' was left up, we get the position of the scene node,
- and modify the Y coordinate a little bit. So if you press 'W', the node
- moves up, and if you press 'S' it moves down.
- */
+ // Remember whether each key is down or up
+ if (event.EventType == irr::EET_KEY_INPUT_EVENT)
+ KeyIsDown[event.KeyInput.Key] = event.KeyInput.PressedDown;
- if (node != 0 && event.EventType == irr::EET_KEY_INPUT_EVENT&&
- !event.KeyInput.PressedDown)
- {
- switch(event.KeyInput.Key)
- {
- case KEY_KEY_W:
- case KEY_KEY_S:
- {
- core::vector3df v = node->getPosition();
- v.Y += event.KeyInput.Key == KEY_KEY_W ? 2.0f : -2.0f;
- node->setPosition(v);
- }
- return true;
- }
- }
-
return false;
}
+
+ // This is used to check whether a key is being held down
+ virtual bool IsKeyDown(EKEY_CODE keyCode) const
+ {
+ return KeyIsDown[keyCode];
+ }
+
+ MyEventReceiver()
+ {
+ memset(KeyIsDown, false, sizeof(KeyIsDown));
+ }
+
+private:
+ // We use this array to store the current state of each key
+ bool KeyIsDown[KEY_KEY_CODES_COUNT];
};
@@ -117,7 +103,7 @@
interesting. Because we have no dynamic lights in this scene we disable
lighting for each model (otherwise the models would be black).
*/
- node = smgr->addSphereSceneNode();
+ scene::ISceneNode * node = smgr->addSphereSceneNode();
node->setPosition(core::vector3df(0,0,30));
node->setMaterialTexture(0, driver->getTexture("../../media/wall.bmp"));
node->setMaterialFlag(video::EMF_LIGHTING, false);
@@ -204,6 +190,21 @@
while(device->run())
{
+ /* Check if key W or key S is being held down, and move the sphere
+ node up or down respectively. */
+ if(receiver.IsKeyDown(irr::KEY_KEY_W))
+ {
+ core::vector3df v = node->getPosition();
+ v.Y += 0.02f;
+ node->setPosition(v);
+ }
+ else if(receiver.IsKeyDown(irr::KEY_KEY_S))
+ {
+ core::vector3df v = node->getPosition();
+ v.Y -= 0.02f;
+ node->setPosition(v);
+ }
+
driver->beginScene(true, true, video::SColor(255,113,113,133));
smgr->drawAll(); // draw the 3d scene
