akkartik/lines.love
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binary search to most natural up/down with proportional fonts

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This commit is contained in:
Kartik K. Agaram 2022-05-16 20:55:21 -07:00
parent 63df6d04e0
commit 0da2ec3850
1 changed files with 35 additions and 9 deletions
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44
main.lua
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@ -157,9 +157,7 @@ function love.draw()
if i == cursor_line then
-- cursor
love.graphics.setColor(0,0,0)
local line_before_cursor = lines[cursor_line]:sub(1, cursor_pos-1)
local text_before_cursor = love.graphics.newText(love.graphics.getFont(), line_before_cursor)
love.graphics.print('_', 25+text_before_cursor:getWidth()*1.5, y+6) -- drop the cursor down a bit to account for the increased font size
love.graphics.print('_', 25+cursor_x(lines[cursor_line], cursor_pos)*1.5, y+6) -- drop the cursor down a bit to account for the increased font size
end
end
end
@ -540,19 +538,21 @@ function keychord_pressed(chord)
if cursor_pos <= #lines[cursor_line] then
cursor_pos = cursor_pos + 1
end
elseif chord == 'home' then
cursor_pos = 1
elseif chord == 'end' then
cursor_pos = #lines[cursor_line]+1
elseif chord == 'up' then
if cursor_line > 1 then
local old_x = cursor_x(lines[cursor_line], cursor_pos)
cursor_line = cursor_line-1
if cursor_pos > #lines[cursor_line] then
cursor_pos = #lines[cursor_line]+1
end
cursor_pos = nearest_cursor_pos(lines[cursor_line], old_x)
end
elseif chord == 'down' then
if cursor_line < #lines then
local old_x = cursor_x(lines[cursor_line], cursor_pos)
cursor_line = cursor_line+1
if cursor_pos > #lines[cursor_line] then
cursor_pos = #lines[cursor_line]+1
end
cursor_pos = nearest_cursor_pos(lines[cursor_line], old_x)
end
elseif chord == 'delete' then
if cursor_pos <= #lines[cursor_line] then
@ -706,6 +706,32 @@ function keychord_pressed(chord)
end
end
function cursor_x(line, cursor_pos)
local line_before_cursor = line:sub(1, cursor_pos-1)
local text_before_cursor = love.graphics.newText(love.graphics.getFont(), line_before_cursor)
return text_before_cursor:getWidth()
end
function nearest_cursor_pos(line, x)
if x == 0 then
return 1
end
local left, right = 1, #line+1
while left < right-1 do
local curr = math.floor((left+right)/2)
local currx = cursor_x(line, curr)
if currx > x-2 and currx < x+2 then
return curr
end
if currx > x then
right = curr
else
left = curr
end
end
return right
end
function in_drawing()
local x, y = love.mouse.getX(), love.mouse.getY()
for _,drawing in ipairs(lines) do