2D rendering engine

Quote:

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Originally Posted by Rocky651

tiberiu11, may I ask you what you are trying to do with AGG?
I mean, what use you plan to make?

The last post you wrote makes me believe we're trying to do something similar ;-)

Rocky

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Rocky,

I am trying to use AGG to replace GDI+. AGG. is a lot faster than GDI+. In some tests it took 20ms to render some rectangles with AGG and 400ms with GDI+. I have a project that uses primitives and transformers(rotation),a nd I am trying to make it faster.

Yes, AGG is not that easy to learn,a nd the documentation is not as good as the GDI+ one. I had to ask on the forum before finding a simple example. The demos are not that good.

I will really need to find a clipping function. I think that there is one, though.

Tiberiu

Quote:

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Originally Posted by Marc G

The learning curve for AGG is indeed pretty steep :(
The following piece of code will draw a blue line and an ellipse with solid blue color and 5 pixel width yellow outline.

Code:

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  // Set color
  ren.color(rgba8(255, 0, 0));
  // Add line
  rasterizer.add_path(stroke);
  // Add solid ellipse
  rasterizer.add_path(transs);
  render_scanlines(rasterizer, sl, ren);

  rasterizer.reset();
  // Set color
  ren.color(rgba8(0, 255, 255));
  // ellipse outline -> stroke the ellipse with a outline of 5 pixels
  strokes.width(5);
  rasterizer.add_path(strokes);
  render_scanlines(rasterizer, sl, ren);

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Marc G,

I was wondering if you could help me out a bit. I need to clip everything to an ellipse. I have tried numerous examples, even looking at the example alpha_mask_2, but I can't figure out how to do it. Could you help me out?

I have this code here:
ellipse e(200, 200, 100, 100);
g_rasterizer.add_path(e);
ren.color(rgba8(167,116,15));
render_scanlines(g_rasterizer, g_scanline, ren);
g_rasterizer.reset();

and before that I call the function generate_alpha_mask(width, height); from example alpha_mask_2. Nothing is clipped. I think that everything stands in the varaible"ren". I do not know what to use to make it work.

Thanks,
Tiberiu

The Alpha_mask2 example is exactly what you need.
Can you post your entire project?

Marc,

I have discovered that I need it. I just copied the function generate_alpha_mask to my project, along with all its declarations. Unfortunately there is no clipping when I call this function. I noticed that when I render my shapes, that the third parameter of render_scanlines(rasterizer, sl, ren); is ren, while in the other examples, they have something different, based on the alpha mask. I have tried changing it, but I get only errors. So the problem currently stands at selecting the most appropriate parameter. I have tried this without any luck:

renderer_scanline_aa_solid<renderer_base<pixfmt_gray8> > ren(m_alpha_mask_rbuf);

Am I going in the right direction? How could I post the entire project here? Just zip it up and attach it as an attachment?

Thanks,
Tiberiu

Quote:

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Originally Posted by tiberiu11

How could I post the entire project here? Just zip it up and attach it as an attachment?

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Yes, just put it in a zip file, but remove temporary files like .pdb files, .ncb, ... and attach it to your reply.

Can u please tell me how to draw a polyline in microsoft windows using these libs?

Thanks,
Chenchu

You can use the Primitives Renderer. You can also use a path_storage and use move_to and line_to.