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  Irregular image drawing  (Read 447 times)
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Offline lcass
« Posted 2013-11-07 18:19:04 »

Hi, ive been building a 3d renderer and I am wandering how would I render a 32 by 32 bitmap onto an irregular square for example filling this square
http://gyazo.com/5ab752c502aa6e03fc6a4eaf670bfcd5
with a bitmap image that is 32 by 32.

I did have two ideas.  idea 1 fill the square before rotating and scaling it , idea 2 draw lines across to fill the image but Im not to sure how I would implement either these two methods.

Thanks.
Offline saucymeatman
« Reply #1 - Posted 2013-11-07 19:47:45 »

I imagine the line filling idea (although interesting) wouldnt be as fast as other options.
Could you just find the rotationg/scale of the square and then transform/scale/rotate a AffineTransform and the create a filter from the AffineTransform and apply the filter to a bufferedimage to be drawn?
Offline lcass
« Reply #2 - Posted 2013-11-08 20:04:34 »

Ive ran through methods currently the line drawing one is the most efficient . drawing 32 * 6 * 4000  is more efficient that 32*32*6*4000  There is only one 32 because only rendering from left to right and doing 32 calculations otherwise you would need to do 32 * more.
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Offline lcass
« Reply #3 - Posted 2013-11-08 20:06:51 »

Ive ran through methods currently the line drawing one is the most efficient . drawing 32 * 6 * 4000  is more efficient that 32*32*6*4000  There is only one 32 because only rendering from left to right and doing 32 calculations otherwise you would need to do 32 * more.


So drawing with the line method is   768000 calculations for 4000 blocks being rendered. or 24576000 for rendering each pixel then manipulating it.
Offline saucymeatman
« Reply #4 - Posted 2013-11-08 20:09:15 »

Oh I see. That makes sense.
Offline lcass
« Reply #5 - Posted 2013-11-08 20:40:19 »

with the second one having less pixel draws because its pre scaled unlike rotating every pixel it just skips the ones it doesnt need to render.
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