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  I search speed algorithm sorter for paint  (Read 2164 times)
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Offline lbrinon

Junior Newbie




Java games rock!


« Posted 2002-10-31 11:12:17 »

hello,

I search a speed sorted paint algorithm for my group of sprites.

have you a example or tips ?

thank you



Offline Captain-Goatse

Junior Member




I suck at teh 2D. XBOX IS BIG LOL!111


« Reply #1 - Posted 2002-10-31 11:43:15 »

Excuse me, but could you explain a little bit more in detail. That would help a lot.
Offline lbrinon

Junior Newbie




Java games rock!


« Reply #2 - Posted 2002-10-31 12:07:17 »

ha sorry for my english.

is for paint one sprite on foreground or background of other sprites depending of the location of sprite on map.

in iso map this :
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mbw
Guest
« Reply #3 - Posted 2002-11-01 06:07:03 »

The Quicksort-algorithm is very fast (as the name lets you expect.), but i never testet out yet if its fast enough for sorting your Sprites each frame...

mbw
Offline Themroc

Junior Member





« Reply #4 - Posted 2002-11-01 10:54:01 »

Seems like you have only few fixed positions where the sprites can be positioned, not on every single pixel?
Depending on the number of sprites and number of possible positions you may also try a bucketsort.

1) If you only care for correct y-drawing and not for the way in whic they overlap in x direction, then create as many vectors/arraylists/arrays (what seems best) as you have positions in y and put them in there according to their y-coordinate and then draw each array. Time is 2*n for n sprites
2) If your care for x-overlapping: make an 2dim array as big as your field. On each sorting set each element to null, then insert the sprites, then run linear through the field again and draw as needed. Time is 2*m+n (m number of fields/possible positions). If this is good really depends on the relative size of m to n. If you have few sprites but many fields it will be slower than a standrad sort.
3) Or simpy use the Collection sort algorithm. Should be as fast as any handcrafted  n*log n sort algorithm.
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