diff options
Diffstat (limited to 'text.lua')
| -rw-r--r-- | text.lua | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/text.lua b/text.lua index e28a9dc..fdf2418 100644 --- a/text.lua +++ b/text.lua @@ -807,21 +807,23 @@ function Text.nearest_cursor_pos(line, x, left) assert(false) end -function Text.nearest_pos_less_than(line, x) -- x DOES NOT include left margin +-- return the nearest index of line (in utf8 code points) which lies entirely +-- within x pixels of the left margin +function Text.nearest_pos_less_than(line, x) +--? print('-- nearest_pos_less_than', line, x) if x == 0 then return 1 end local len = utf8.len(line) - local max_x = Text.x(line, len+1) + local max_x = Text.x_after(line, len) if x > max_x then return len+1 end local left, right = 1, len+1 ---? print('--') while true do local curr = math.floor((left+right)/2) - local currxmin = Text.x(line, curr+1) - local currxmax = Text.x(line, curr+2) + local currxmin = Text.x_after(line, curr+1) + local currxmax = Text.x_after(line, curr+2) --? print(x, left, right, curr, currxmin, currxmax) if currxmin <= x and x < currxmax then return curr @@ -838,6 +840,14 @@ function Text.nearest_pos_less_than(line, x) -- x DOES NOT include left margin assert(false) end +function Text.x_after(s, pos) + local offset = Text.offset(s, math.min(pos+1, #s+1)) + local s_before = s:sub(1, offset-1) +--? print('^'..s_before..'$') + local text_before = App.newText(love.graphics.getFont(), s_before) + return App.width(text_before) +end + function Text.x(s, pos) local offset = Text.offset(s, pos) local s_before = s:sub(1, offset-1) |