Rotating Pixel Art

[jumptrigger]

I'm making a shooter game and I have really small sprite 9x9, the problem is when I rotate them it gets distorted.
How exactly do I fix this?

[pgimeno]

Thrust II had 32 hand-drawn ship rotations precisely for this reason (actually, only 4; the rest were reflections and 90 degree rotations). Try drawing it by hand.

[jumptrigger]

Thanks for the help. Is this really the only way what if I want to make lots of ships?

[darkfrei]

You can make your own rotating algorithm and keep the symmetry.

By the target sprite, starting by diagonal and going to one of the edge tile:
1. Take the middle of that tile, do rotating about sprite center and ask the color of tile by the source sprite.
1a. Take another 4 points in this tile and and the colors after rotation by the source sprite.
1b. Make the sprites with 1, 2, 3, 4 and 5 used taked points. You cannot be sure which is better until the choose the better solution. This step is for contrast edge on some level.
After all, make the symmetry.

[jumptrigger]

So?
1. rotate by center of sprite
1a. find what color was at the 4 points when not rotated, but which 4 points?
1b. not sure what you mean

[darkfrei]

So?
1. rotate by center of sprite
1a. find what color was at the 4 points when not rotated, but which 4 points?
1b. not sure what you mean

1a. For example if tile is a square 1 by 1 with the center in the (0.5, 0.5), then take the points (a, b , c , d, e), where

Code: Select all

pointA = {0.5, 0.5} -- center
-- (yet not rotated, in target tiles coordinate system)
pointB = {0.5+0.5*math.cos(math.pi/4), 0.5+0.5*math.sin(math.pi/4)}
pointC = {0.5+0.5*math.cos(math.pi/4+math.pi/2), 0.5+0.5*math.sin(math.pi/4+math.pi/2)}
pointD = {0.5+0.5*math.cos(math.pi/4+2*math.pi/2), 0.5+0.5*math.sin(math.pi/4+2*math.pi/2)}
pointE = {0.5+0.5*math.cos(math.pi/4+3*math.pi/2), 0.5+0.5*math.sin(math.pi/4+3*math.pi/2)}

1b. Just save all images where amount of points are true (black on white or white on black) are same-or-more: 1, 2, 3, 4, 5 and choose the best one by yourself.

[jumptrigger]

I just decided to scale the image and it looks better