how to use sprite for button?

[comicsteam]

i want to use button->setSprite() to make my button use different texture image on different state.
however, i don't know how to use the sprite bank
my program just crashed after i clicked the button.
here's my code:

Code: Select all

	gui::IGUIButton* button= guienv->addButton(core::rect<s32>(core::position2di(500,400), core::dimension2di(64,64)), 0, -1, L"Send", 0);
	if(button){
		//----make a sprite bank
		gui::IGUISpriteBank* sb = guienv->addEmptySpriteBank("my button");
		video::ITexture* texture_down = driver->getTexture("button_down.png");
		video::ITexture* texture_over = driver->getTexture("button_over.png");
		video::ITexture* texture_up = driver->getTexture("button_up.png");
		sb->addTexture(texture_down);
		//sb->setTexture(0, texture_down);
		sb->addTexture(texture_over);
		//sb->setTexture(1, texture_over);
		sb->addTexture(texture_up);
		//sb->setTexture(2, texture_up);

		//----apply to my button
		button->setSpriteBank(sb);
		button->setSprite(gui::EGBS_BUTTON_DOWN, 0, video::SColor(255, 255, 255, 255), false);
	}

does anyone know what the problem is?

[JP]

what does your debugger say when it crashes? :p

you could check out my IGUIFileSelector which I put in the Code Snippets thread a while ago, that uses a sprite bank, i do remember they were a bit tricky to handle...

[comicsteam]

what does your debugger say when it crashes? :p

you could check out my IGUIFileSelector which I put in the Code Snippets thread a while ago, that uses a sprite bank, i do remember they were a bit tricky to handle...

it said "Unhandled exception at 0x1001d0c2 in sc_viewer.exe: 0xC0000005: Access violation reading location 0x00000008."

i have read your post, but still couldnt find any solution
i thought sprite bank is just an array of texture....
am i misunderstand about what sprite bank truly means??

[hybrid]

If you really debug your app you'll aslo see the stack trace and the debugger will point to the problematic code section. That's the really important thing.

[asparagusx]

Are you sure all the textures exist and that the getTexture function is not returning 0 (NULL)?

[comicsteam]

If you really debug your app you'll aslo see the stack trace and the debugger will point to the problematic code section. That's the really important thing.

it always pointed to "env->drawAll();"

Are you sure all the textures exist and that the getTexture function is not returning 0 (NULL)?

i m sure that there's no texture missing
i use sb->getTextureCount() to check it
and sb->getTexture(0) can return the texture I have just added

it seems that it cannot find any sprite in the sprite bank
do I need to add some sprites into the sprite bank before calling setSprite()?
how can i do this?

[comicsteam]

problem solved.....
i have added a new empty sprite bank, but it don't have any sprite in it
now i added a sprite (with a single frame) and it works

Code: Select all

//add an empty sprite bank
gui::IGUISpriteBank* sb = guienv->addEmptySpriteBank("my button");
video::ITexture* texture_up = driver->getTexture("button_up.png");
video::ITexture* texture_down = driver->getTexture("button_down.png");
video::ITexture* texture_over = driver->getTexture("button_over.png");

//add textures into sprite bank
sb->addTexture(texture_up); //0
sb->addTexture(texture_down); //1
sb->addTexture(texture_over); //2

//add sizes
sb->getPositions().push_back(core::rect<s32>(core::position2di(0,0), texture_up->getOriginalSize()));
sb->getPositions().push_back(core::rect<s32>(core::position2di(0,0), texture_down->getOriginalSize()));
sb->getPositions().push_back(core::rect<s32>(core::position2di(0,0), texture_over->getOriginalSize()));

//add sprites
gui::SGUISprite sprite;
gui::SGUISpriteFrame sframe;
sprite.Frames.push_back(sframe);
sprite.Frames[0].rectNumber = 0;
sprite.Frames[0].textureNumber = 0;
sb->getSprites().push_back(sprite);
sprite.Frames[0].rectNumber = 1;
sprite.Frames[0].textureNumber = 1;
sb->getSprites().push_back(sprite);
sprite.Frames[0].rectNumber = 2;
sprite.Frames[0].textureNumber = 2;
sb->getSprites().push_back(sprite);

//use the sprite bank
button->setSpriteBank(sb);
button->setSprite(gui::EGBS_BUTTON_UP, 0, video::SColor(255, 255, 255, 255), false);
button->setSprite(gui::EGBS_BUTTON_DOWN, 1, video::SColor(255, 255, 255, 255), false);
button->setSprite(gui::EGBS_BUTTON_MOUSE_OVER, 2, video::SColor(255, 255, 255, 255), false);
button->setSprite(gui::EGBS_BUTTON_MOUSE_OFF, 0, video::SColor(255, 255, 255, 255), false);

however, another problem comes.........
both EGBS_BUTTON_MOUSE_OVER and EGBS_BUTTON_MOUSE_OFF are not usable
the button changes when it's clicked, but it doesn't change when the cursor moves over it

[Nox]

The problem is, that some parts of irrlicht are incomplete. But a working mouseover effect would be cool.

[Nox]

I created a patch for the GUIButton. You can apply it easly to a workingcopy of irrlicht. Link: https://sourceforge.net/tracker/index.p ... tid=540678

May be it will be added soon.