playing with helloworld

[james]

Ok, COMPLETELY new to this.
I figured playing with and breaking the examples was probably a good way to learn, but all I seem to do is break them so far ... I added this code to the helloworld app, before int main()

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	IAnimatedMesh* mesh = 0;
	IAnimatedMeshSceneNode* node = 0;

class MyEventReceiver : public IEventReceiver
{

public:

	virtual bool OnEvent(SEvent event)
	{
		core::vector3df v = mesh->getPosition() + 3.0f;
		if(event.KeyInput.Key == KEY_KEY_W) { mesh->setPosition(v); }

		return true;

	}
}

And changed the bit later on in main() to:

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	mesh = smgr->getMesh("../../media/sydney.md2");
	node = smgr->addAnimatedMeshSceneNode( mesh );

My intention was that when W is pressed, the mesh moves 3.0f. However when compiling I get the following:

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--------------------Configuration: HelloWorld - Win32 Debug--------------------
Compiling...
main.cpp
c:\irrlicht-0.6\examples\1.helloworld\main.cpp(89) : error C2628: 'MyEventReceiver' followed by 'int' is illegal (did you forget a ';'?)
c:\irrlicht-0.6\examples\1.helloworld\main.cpp(206) : error C2664: '__thiscall MyEventReceiver::MyEventReceiver(const class MyEventReceiver &)' : cannot convert parameter 1 from 'const int' to 'const class MyEventReceiver &'
        Reason: cannot convert from 'const int' to 'const class MyEventReceiver'
        No constructor could take the source type, or constructor overload resolution was ambiguous
c:\irrlicht-0.6\examples\1.helloworld\main.cpp(206) : error C2553: no legal conversion of return value to return type 'class MyEventReceiver *'
c:\irrlicht-0.6\examples\1.helloworld\main.cpp(207) : warning C4508: 'main' : function should return a value; 'void' return type assumed
Error executing cl.exe.

HelloWorld.exe - 3 error(s), 1 warning(s)

You might class me as lazy, but I don't really know what to do with it, even with the helpful little things that the compiler suggests. Please help me :\

[Slash]

LOL. Nice try but you cant just put a Key event in the middle of your code. You have to create a event receiver for input then attach it to your display driver for input when you press a key. Look at the movement exsample a little bit harder.

[james]

Ok, I'm stupid *flushes with n00bness*. I didn't create an actual instance of My EventReciever. I thought that would solve the problem, but it doesn't seem to.

In effect, I have no idea what your reply is suggesting I do.

[james]

Ok, this is annoying. I'm going to post the entire code for what I have now, with the compiler errors. All the errors seem to be related to main() being of type int, and what it returns. Though it all looks ok to me.

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#include <irrlicht.h>


using namespace irr;


using namespace core;
using namespace scene;
using namespace video;
using namespace io;
using namespace gui;


#pragma comment(lib, "Irrlicht.lib")

ISceneNode* node = 0;

class MyEventReceiver : public IEventReceiver
{
public:
	virtual bool OnEvent(SEvent event)
	{
		core::vector3df v = node->getPosition() + 3.0f;
		if(event.KeyInput.Key == KEY_KEY_W) { node->setPosition(v); return true;}
	return false;
	}
}

int main()
{

	MyEventReceiver receiver;


	IrrlichtDevice *device =
		createDevice(EDT_DIRECTX9, dimension2d<s32>(1024, 768), 16, false, false, 0);

	device->setWindowCaption(L"Hello World! - Irrlicht Engine Demo");


	IVideoDriver* driver = device->getVideoDriver();
	ISceneManager* smgr = device->getSceneManager();
	IGUIEnvironment* guienv = device->getGUIEnvironment();


	guienv->addStaticText(L"Hello World! This is the Irrlicht Software engine!",
		rect<int>(10,10,200,30), true);

	node = smgr->addTestSceneNode();





	smgr->addCameraSceneNode(0, vector3df(0,10,-40), vector3df(0,0,0));


	while(device->run())
	{

		driver->beginScene(true, true, SColor(0,100,100,100));

		smgr->drawAll();
		guienv->drawAll();

		driver->endScene();
	}


	device->drop();

	return 0;
}

Compiler errors:

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Deleting intermediate files and output files for project 'HelloWorld - Win32 Debug'.
--------------------Configuration: HelloWorld - Win32 Debug--------------------
Compiling...
main.cpp
c:\irrlicht-0.6\examples\1.helloworld\main.cpp(30) : error C2628: 'MyEventReceiver' followed by 'int' is illegal (did you forget a ';'?)
c:\irrlicht-0.6\examples\1.helloworld\main.cpp(73) : error C2664: '__thiscall MyEventReceiver::MyEventReceiver(const class MyEventReceiver &)' : cannot convert parameter 1 from 'const int' to 'const class MyEventReceiver &'
        Reason: cannot convert from 'const int' to 'const class MyEventReceiver'
        No constructor could take the source type, or constructor overload resolution was ambiguous
c:\irrlicht-0.6\examples\1.helloworld\main.cpp(73) : error C2553: no legal conversion of return value to return type 'class MyEventReceiver *'
c:\irrlicht-0.6\examples\1.helloworld\main.cpp(74) : warning C4508: 'main' : function should return a value; 'void' return type assumed
Error executing cl.exe.

HelloWorld.exe - 3 error(s), 1 warning(s)

Sorry, but it's getting tedious here too.

[Acki]

Well, the event receiver class must end with an ";"

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class MyEventReceiver : public IEventReceiver { 
   public: virtual bool OnEvent(SEvent event) { 
      core::vector3df v = node->getPosition() + 3.0f; 
      if(event.KeyInput.Key == KEY_KEY_W) { 
         node->setPosition(v); 
         return true;
      } 
   return false; 
   } 
};

Then you have to setup the engine with the receiver:

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   MyEventReceiver receiver; 
   IrrlichtDevice *device = 
      createDevice(EDT_DIRECTX9, dimension2d<s32>(1024, 768), 16, false, false, receiver); 

CU, Acki

[Robomaniac]

Also, don't do

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node->getPosition() + 3.0f;

do

v += vector3d<f32>(0.0f, 0.0f, 3.0f);

[rincewind]

acki forgot the "&", you have to pass a pointer to your eventreceiver into
the createDevice-method:

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MyEventReceiver receiver; 
   IrrlichtDevice *device = 
      createDevice(EDT_DIRECTX9, dimension2d<s32>(1024, 768), 16, false, false, &receiver); 

[james]

MY UNDYING GRATITUDE FROM THE DEEPEST VENTRICLES OF MY HEART

...it works. thankee.

For the record, I admit most of the stuff I did was stupid.