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Corrects horizontal imbrication in display::hexes_under_rect,

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...resolves issue with scrolling

http://forums.wesnoth.org/viewtopic.php?f=4&t=35886
This commit is contained in:
Justas Tomkus 2012-04-08 21:42:48 +00:00
parent 19b19fc062
commit fe631c40a3
1 changed files with 4 additions and 2 deletions
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6
src/display.cpp
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@ -552,8 +552,10 @@ const display::rect_of_hexes display::hexes_under_rect(const SDL_Rect& r) const
double tile_width = hex_width();
double tile_size = hex_size();
double border = theme_.border().size;
// the "-0.25" is for the horizontal imbrication of hexes (1/4 overlaps).
res.left = static_cast<int>(std::floor(-border + x / tile_width - 0.25));
// we minus 18, because it's how many pixels overlap of each two nearby
// hexes, and dividing it by tile width becomes horizontal imbrication.
// in this case 18/54 = 0.(3)
res.left = static_cast<int>(std::floor(-border + (x-18) / tile_width));
// we remove 1 pixel of the rectangle dimensions
// (the rounded division take one pixel more than needed)
res.right = static_cast<int>(std::floor(-border + (x + r.w-1) / tile_width));