how to draw a filled circle

thatax · Post by **thatax** » Fri Sep 05, 2008 3:42 am

draw2DPolygon just can draw a non filled circle.

another question: wheather irr supports drawing text on the screen or not,not using conctrols.

pera · Post by **pera** » Fri Sep 05, 2008 7:45 am

to answer another question, text can be shown on the screen without any gui element, like this:
GUIEnvironment()->addStaticText(L"PERA",rect<s32>(20,20,200,40),false,false,0);
just make sure parameter "parent" is 0.

JP · Post by JP » Fri Sep 05, 2008 8:19 am

That still uses a GUI element though; IGUIStaticText.

You can also use IGUIFont::draw();

pera · Post by **pera** » Fri Sep 05, 2008 8:28 am

Ok is this "Beginners Help" thread or "Pros Help"?
Only beginners suppose to help here. You know too much

JP · Post by JP » Fri Sep 05, 2008 8:30 am

*scribbles out pera's name on his list of people he's willing to help*

thatax · Post by **thatax** » Fri Sep 05, 2008 10:30 am

thx, it's done.

rogerborg · Post by **rogerborg** » Fri Sep 05, 2008 12:30 pm

There's no Irrlicht method (AFAIK) that supports drawing filled 2D polygons. It would be possible to write one (that draws untransformed triangles), but could you just draw a circle bitmap instead?

hybrid · Post by **hybrid** » Fri Sep 05, 2008 4:30 pm

Yeah, the video driver method produces unfilled polys, but OpenGL has a polygon primitive. Thi sin't supported by the other drivers, yet, but would probably a good place to start. The concyclic regular polys which would be used for a circle could also be made more generic and support a material or at least colors...

ehenkes · Post by **ehenkes** » Sat Sep 06, 2008 4:28 am

Use an image, define a transparent color (e.g. black or magenta) and render with "draw2DImage(...)" between driver->beginScene and driver->endScene:

Code: Select all

ITexture* pFilledCircle  = driver->getTexture("FilledCircle.png" );
if(pFilledCircle) 
  driver->makeColorKeyTexture(pFilledCircle, SColor(0,0,0,0)); //transparent color
//...
driver->draw2DImage(pFilledCircle, position2di(0,568), rect<s32>(0,0,400,200), 0, SColor(150,255,255,100), true );