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base:spritevectors

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Sprite vectors

Basically one can also draw edges by displaying sprites and manipulating there x position per line. If done so from left to right and with rising priority, several edges can be stacked and thus a vector being build. The rightmost edge then needs to be drawn in background color. But faces might not get bigger than 24 pixels and higher than 21 pixels, a bit small. Also other restrictions hit in, like badlines which makes it impossible to manipulate all sprites each rasterline.

As a first step, we can expand all sprites in X and Y to achieve more effect area, but this is still not satisfactory. As we inspect the shape of a cube, we notice, that it maximum has 3 edges on the left side and a final edge at the right to separate it from the background. So if we manage to display those 4 edges with 4 sprites, we are already on a good way and only need to change 4 x-positions per rasterline, do we? As for the height, we can make use of the sprite stretching trick to make the sprites up to 200 pixels high or even beyond. Happily, this trick also gives us other advantages, as we can switch sprites on/off by omitting a stretch for a single sprite at any given line.

to be continued soon…

base/spritevectors.1481280937.txt.gz · Last modified: 2016-12-09 11:55 by bitbreaker