Crosshair explanation

[screwgh]

Here a bit off code snippet to make a crosshair:

put this following code in you`re while loop but remember to put this after drawAll otherwise it won`t work.

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	while(device->run())
	{


		driver->beginScene(true, true, SColor(255,100,101,140));	//Must draw between begin and end. Begin drawing
		//////////////////////////////////////////////////////////////Begin drawing


		smgr->drawAll();											//Scenemanager drawing
		

		//Draw crosshair
		driver->draw2DRectangle( SColor(255,255,255,255), rect<s32>(cenW,cenH-8,cenW+2,cenH-3) ); //above 
		driver->draw2DRectangle( SColor(255,255,255,255), rect<s32>(cenW+5,cenH,cenW+10,cenH+2) ); //right 
		driver->draw2DRectangle( SColor(255,255,255,255), rect<s32>(cenW,cenH+5,cenW+2,cenH+10) ); //down 
		driver->draw2DRectangle( SColor(255,255,255,255), rect<s32>(cenW-8,cenH,cenW-3,cenH+2) ); //left 
		driver->draw2DRectangle( SColor(255,255,255,255), rect<s32>(cenW,cenH,cenW+2,cenH+2) ); //center of screen
	
		guienv->drawAll();											//Gui environment drawing
	
		

		//////////////////////////////////////////////////////////////End drawing
		driver->endScene();											//Stop drawing
	}

to get the position and the middle of the screen I created the folowing variables.

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int screenW = 800;
int screenH = 600;
int cenW = screenW / 2;
int cenH = screenH / 2;

Thats all you now you got a nice crosshair to start with.

[Mazza]

Simple and works great, thanks a lot

[Pakje]

im wondering isnt it better to use the irrlicht variables?

[Acki]

im wondering isnt it better to use the irrlicht variables?

what are Irrlicht variables !?!?!
you mean Irrlicht types, I think...

well, the code is nice, even it was covered a few times in the beginner forum...

but I, for myself, prefere to use an image for the cross hair though, this way you can use any shape for the CH and switch between different CHs easily...

[sudi]

There u have texture support

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class CCrossHair : public irr::gui::IGUIElement
{
public:
    CCrossHair(irr::gui::IGUIEnvironment *  environment, irr::u32 id = -1) : irr::gui::IGUIElement  (  irr::gui::EGUIET_ELEMENT, environment, environment->getRootGUIElement(), id, irr::core::rect< irr::s32 >(0,0,0,0))
    {
        Texture = 0;
        Color = irr::video::SColor(255,255,255,0);
        Size = 10;
    }

    virtual ~CCrossHair(void)
    {
        if (Texture)
            Texture->drop();
    }

    void draw(void)
    {
        irr::video::IVideoDriver* driver = Environment->getVideoDriver();

        irr::u32 screenW = driver->getScreenSize().Width;
        irr::u32 screenH = driver->getScreenSize().Height;
        irr::u32 cenW = screenW / 2;
        irr::u32 cenH = screenH / 2;

        if (!Texture)
        {
            //Draw crosshair
            driver->draw2DRectangle( Color, irr::core::rect<irr::s32>(cenW-1,cenH-Size,cenW+1,cenH-4) ); //above
            driver->draw2DRectangle( Color, irr::core::rect<irr::s32>(cenW+4,cenH-1,cenW+Size,cenH+1) ); //right
            driver->draw2DRectangle( Color, irr::core::rect<irr::s32>(cenW-1,cenH+4,cenW+1,cenH+Size) ); //down
            driver->draw2DRectangle( Color, irr::core::rect<irr::s32>(cenW-Size,cenH-1,cenW-4,cenH+1) ); //left
            driver->draw2DRectangle( Color, irr::core::rect<irr::s32>(cenW-1,cenH-1,cenW+1,cenH+1) ); //center of screen
        }
        else
        {
            irr::video::SColor Colors [] = {Color, Color, Color, Color};
            driver->draw2DImage(Texture, irr::core::rect< irr::s32 >(cenW-Size, cenH-Size, cenW+Size, cenH+Size), irr::core::rect< irr::s32 >(0, 0, Texture->getOriginalSize().Width, Texture->getOriginalSize().Height), 0, Colors, true);
        }

    }

    void setTexture(irr::video::ITexture* texture)
    {
        if (Texture)
            Texture->drop();

        Texture = texture;

        if (Texture)
            Texture->grab();
    }

    void setSize(irr::u32 size)
    {
        Size = size;
    }

    void setColor(irr::video::SColor color)
    {
        Color = color;
    }
protected:
    irr::video::ITexture* Texture;
    irr::u32 Size;
    irr::video::SColor Color;
};

[kiranmaya]

nice code ,im goona use it..

thankq