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fix for 2012-04-08T21:42:48Z!justas.tomkus@google.com; making tile width and zoom independant

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Justas Tomkus 2012-04-09 14:04:51 +00:00
parent 402653e01b
commit bb7b4f7b79
1 changed files with 5 additions and 4 deletions
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9
src/display.cpp
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@ -552,10 +552,11 @@ 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;
// 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 minus "0.(3)", for horizontal imbrication.
// reason is: two adjacent hexes each overlap 1/4 of their width, so for
// grid calculation 3/4 of tile width is used, which by default gives
// 18/54=0.(3). Note that, while tile_width is zoom dependand, 0.(3) is not.
res.left = static_cast<int>(std::floor(-border + x / tile_width - 0.3333333));
// 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));