I can't see my 2Dline...

[KAHIMA]

I've made a speedometer but the needle can't be seen??what am I supposed to do??Please help...
Here's the my source code :

Code: Select all

	video::IVideoDriver* driver = device->getVideoDriver();
	gui::IGUIEnvironment* env = device->getGUIEnvironment();
	driver-> draw2DLine (position2d <s32> (20, 20), position2d <s32> (80, 80), SColor(0, 0, 0, 0));
	env->addImage(driver->getTexture("speedometer.png"),
		core::position2d<s32>(800,10));

[Masterhawk]

i guess you have to draw the line in every frame. and then you should draw it later than the gui, otherwise the needle will be hidden behind the image

[Cloudef]

Also you need to draw it beetwen beginscene and endscene tags.

[JP]

And you need to setup the driver's transform matrix and material as per the documentation.

[KAHIMA]

Would you like to give me the way to create the line per frame ? I dont know how to create that?

[Sylence]

You call draw2DLine() in your while( device->run() ) loop between beginScene() and endScene()

[KAHIMA]

I still can't see the line... whereas i did your suggestion to write between while device run etc....

[Sylence]

See JP's post. You have to setup the transform matrix and the material.

[KAHIMA]

Code: Select all

SMaterial m;
   m.Lighting=false;
   driver->setMaterial(m);
   driver->setTransform(video::ETS_WORLD, core::matrix4());

it's that true?? but i still can't see my line...

[shadowslair]

Code: Select all

SMaterial m;
          m.Lighting = false;
          Driver->setMaterial(m);
          Driver->setTransform(video::ETS_WORLD, core::matrix4());

		  Driver->draw3DLine(vector3df(0,0,0),vector3df(1,0,0),video::SColor(255,255,0,0));
		  Driver->draw3DLine(vector3df(0,0,0),vector3df(0,1,0),video::SColor(255,0,255,0));
		  Driver->draw3DLine(vector3df(0,0,0),vector3df(0,0,1),video::SColor(255,0,0,255));

This code will draw three lines at the world origin. Call it at the proper place the guys mentioned above and you should be fine.

EDIT: Oops. This is for 3d. The 2d variation is almost the same though.

[KAHIMA]

Code: Select all

while(device->run())
		if (device->isWindowActive())
		{
			driver->beginScene(true, true, 0 );
			SMaterial m;
			m.Lighting = false;
			driver->setMaterial(m);
			driver->setTransform(video::ETS_WORLD, core::matrix4());
			driver->draw3DLine(vector3df(0,0,0),vector3df(1,0,0),video::SColor(255,255,0,0));
			driver->draw3DLine(vector3df(0,0,0),vector3df(0,1,0),video::SColor(255,0,255,0));
			driver->draw3DLine(vector3df(0,0,0),vector3df(0,0,1),video::SColor(255,0,0,255));
			smgr->drawAll();
			env->drawAll();
			driver->endScene();
			

if i use that's code, i just see tha line at about 1 second... i don't understand ... I just want to make needle for a speedometer, or any others idea??

[shadowslair]

I`d use the compass code and draw a poly on screen and rotate it if I was you. This will give you some benefits than using the line- you can use whatever speedometer needle you want and customize it better- by one rotation only. Just look for "compass", "compass scene node", or you can check Acki`s extensions for ICompassSceneNode also ( http://abusoft.g0dsoft.com/ ).

[KAHIMA]

What do you mean with ICompassSceneNode, i could't find it...
Where i can found the tutorial and the library? I really new in this case...

[vitek]

Search these forums for compass or IGUICompass. I wrote a gui element that represents a compass some time ago, and it has been adapted several times. You should find it and the others.

Travis