diff options
| -rw-r--r-- | src/gfx.cpp | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/src/gfx.cpp b/src/gfx.cpp index 6d6a7342e..82214aedf 100644 --- a/src/gfx.cpp +++ b/src/gfx.cpp @@ -399,18 +399,26 @@ static int DrawString(int left, int right, int top, char *str, const char *last, int w = GetStringBoundingBox(str).width; + /* right is the right most position to draw on. In this case we want to do + * calculations with the width of the string. In comparison right can be + * seen as lastof(todraw) and width as lengthof(todraw). They differ by 1. + * So most +1/-1 additions are to move from lengthof to 'indices'. + */ switch (align) { case SA_LEFT: - right = left + w; + /* right + 1 = left + w */ + right = left + w - 1; break; case SA_CENTER: - left += (right - left - w + 1) / 2; - right = left + w; + /* The second + 1 is to round to the closest number */ + left = (right + 1 + left - w + 1) / 2; + /* right + 1 = left + w */ + right = left + w - 1; break; case SA_RIGHT: - left = right - w; + left = right + 1 - w; break; default: |