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Well, i used the star just an a example of what I am trying to do, in fact I need to be able to draw any irregular polygon and fill it. So,since the polygons will be randomly created I can not use the approach of using images.

thanks and regards

Hi,

I am trying to use POLYVECTOR in order to draw a Polygon, but I noted that it is not filled as I expected. I need that the polygon is filled only by inside, but instead, the polygon is filled drawing a triangle from the first edge to the rest of them, so concave polygons are not filled correctly (i.e. when drawing a star, please see my attached image).

I found that there are some algorythms to do it (i.e. scanline algorythm) , but before implement it I would like to know it this is already implemented for GLBasic.

Thanks and regards

Serge
www.tiptapgames.com

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Mhh, not yet, but I will make some performance test and let you know the results

Best regards

Serge
www.tiptapgames.com

  That's exactly what I needed, thanks so much for your help!!

Serge
www.tiptapgames.com

Hi,

I need to have 2 images, one as backgrond and other one that at the begining does not have any transparency, so I will draw a irregular area on this image and I need to make transparent only this area, so it will be like a window where you can see the background.

I hope it clarifies.

Thanks again and best regards.

Serge
www.tiptapgames.com

Hi all,

I am trying to make transparent some random areas of a image before draw it to the back buffer. I saw the functions GetPixel and SetPixel but I think they work only over the back buffer.  I would need to be able to modify the image before draw it, so the areas that I randomly defined transparent will not be drawn.

Basically what I need is:

-Load an image in a sub-buffer where I could be able to read the pixels and modify them.
-Keep this image and the modifications in memory, since I would need to use it again.
-Redefine the DrawSprite, so I could be able to draw in the buffer only the areas that I required.

Is it possible?

Thanks so much and regards

Serge
www.tiptapgames.com