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MattieB

Sprite rotation and size

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Hi

I'm currently working on a top-down, tile-based 2d tactical game. Time has come to work a little bit on the art and I'm having some problems with my playing characters. A player is represented as a circle with a small line perpendicular to the edge ( something like this: o- ). I currently use a 16x16 png file which i rotate according to the 'player's walking angle' (if the player is walking from (0,0) to (10,10), i rotate the sprite 45 degrees). The rotation angle of the sprite can therefore be any (float) value between 0 and 360 degrees. When the angle is not a multiple of 90 degrees, I notice that the result looks really bad (I guess every pixel is rotated and due to rounding errors the resulting position of some pixels is wrong (I use sfml btw)).
Now I was wondering if this problem is solvable (my first guess is: yes) and how? Will it, for instance, help if i make a high res png file (eg 256x256)), which i let sfml rotate and scale? Is it maybe better to use the shape drawing api (after all, it's just a circle and a line, though at this moment i have a slightly 3d effect in the png which i want to have. This is probably hard to simulate with the graphics api).
In general, is it good tactics to have high res textures and scale them according to zooming level, or is it better to have 1 png file per zooming level per object (and what about continuous zooming) (for instance 16x16, 32x32 and 64x64 png file)? I've been playing around a little bit with the different options, but at this moment I haven't found a satisfying one. So what is your approach?

Thanks for the help,

Jan

Ps: my goal is to have something similar to the map view of the Hitman games. There the enemies seem to turn around very smoothly and the circles are quite sharp.

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Can you post a screenshot of how the rotated images are 'wrong'?

If you go for a shapey look'n'feel, I would recommend drawing the shapes directly. The result will be always better than using bitmaps, which have limited precision.

Having more versions of one texture with different sizes and using them is a technique used in 3D graphics, it is called mipmapping. For 2D games, it is probably superfluous, however.

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That indeed gives a better result, thanks!

Though zooming is still not good. I guess i'll have to work with 2 different sprite resolutions

Jan

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FWIW, your game sounds kind of like my game I made (in my old blog link here and in my sig) in that it's a top-down shooter, and my character is a circle with an arrow pointing the way. Although, it used SFML 2.0 pre-release (and pre-coding standard change it went through)

Have fun, and good luck!

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