How can i fill and texture a cylinder in java without using opengl or directx

Question

is there a book or tutorial that show this with simple example?

What kind of technology/framework are you using for rendering the cylinder? — micha, Dec 21 '12 at 20:29
If you don't use OpenGL or DirectX to do it, I can guarantee you, it will not be a *simple* example. — Name, Dec 21 '12 at 20:43

Joop Eggen · Answer 1 · 2012-12-21T20:59:27.830

I think it is doable.

Java: In standard java one could use BufferedImage, with its getGraphics method yielding a Graphics2D object. And then there are ImageFilters.

For the (non-perspective) math: If one looks straight at a cylinder one sees a width 2*r, which actually is a half-circle pi*r.

actual coordinate:  alpha*r, between -0.5*pi*r and +0.5*pi*r
screen coordinate:  sin(alpha)*r, between -r and +r

Scaled:

screen[x, y] = image[asin(x), y]

On scaling one might interpolate some pixels, taking the average of

image[asin(x-1)+1, y] .. image[asin(x+1)-1, y]

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