snapshot: wrapping long lines at word boundaries

[?]

May 20, 2022, 12:29 AM

H2DPLWMVRFYTO2CQTG54FMT2LF3B6UKLXH32CUA22DNQJVP5XBNQC

Dependencies

[2] 4C375P53 this is a bit clearer
[3] UWNHC4AA redo y computations
[4] YJGADSGK delete unused arg
[5] XNFTJHC4 split keyboard handling between Text and Drawing
[6] BULPIBEG beginnings of a module for the text editor
[7] DLQMM265 scroll past first page
[8] B3IWYWSR delete another arg that can be deduced
[*] OTIBCAUJ love2d scaffold

Change contents

replacement in text.lua at line 6

[3.44]→[3.1:63](∅→∅)

function Text.draw(line, line_index, cursor_line, cursor_pos)

[3.44]

[3.109]

function Text.compute_fragments(line, line_width)
line.fragments = {}
local x = 25
-- try to wrap at word boundaries
for frag in line.data:gmatch('%S*%s*') do
local frag_text = love.graphics.newText(love.graphics.getFont(), frag)
local frag_width = math.floor(frag_text:getWidth()*Zoom)
--? print('x: '..tostring(x)..'; '..tostring(line_width-x)..'px to go')
--? print('frag: ^'..frag..'$ is '..tostring(frag_width)..'px wide')
if x + frag_width > line_width then
while x + frag_width > line_width do
if x < 0.8*line_width then
-- long word; chop it at some letter
-- We're not going to reimplement TeX here.
local b = Text.nearest_cursor_pos(frag, line_width - x)
--? print('space for '..tostring(b)..' graphemes')
local frag1 = string.sub(frag, 1, b)
local frag1_text = love.graphics.newText(love.graphics.getFont(), frag1)
local frag1_width = math.floor(frag1_text:getWidth()*Zoom)
--? print('inserting '..frag1..' of width '..tostring(frag1_width)..'px')
table.insert(line.fragments, {data=frag1, text=frag1_text})
frag = string.sub(frag, b+1)
frag_text = love.graphics.newText(love.graphics.getFont(), frag)
frag_width = math.floor(frag_text:getWidth()*Zoom)
end
x = 25 -- new line
end
end
if #frag > 0 then
--? print('inserting '..frag..' of width '..tostring(frag_width)..'px')
table.insert(line.fragments, {data=frag, text=frag_text})
end
end
end

function Text.draw(line, line_width, line_index, cursor_line, cursor_pos)
love.graphics.setColor(0.75,0.75,0.75)
love.graphics.line(line_width, 0, line_width, Screen_height)
replacement in text.lua at line 45

[3.141]→[3.141:219](∅→∅),[3.219]→[3.64:116](∅→∅),[3.116]→[3.266:316](∅→∅),[3.266]→[3.266:316](∅→∅),[3.316]→[3.117:264](∅→∅)

local love_text = love.graphics.newText(love.graphics.getFont(), line.data)
love.graphics.draw(love_text, 25,line.y, 0, Zoom)
if line_index == cursor_line then
-- cursor
love.graphics.print('_', Text.cursor_x(line.data, cursor_pos), line.y+6) -- drop the cursor down a bit to account for the increased font size

[3.141]

[3.31]

-- wrap long lines
local x = 25
local y = line.y
local pos = 1
if line.fragments == nil then
Text.compute_fragments(line, line_width)
end
for _, f in ipairs(line.fragments) do
local frag, frag_text = f.data, f.text
-- render fragment
local frag_width = math.floor(frag_text:getWidth()*Zoom)
if x + frag_width > line_width then
assert(x > 25) -- no overfull lines
y = y + math.floor(15*Zoom)
x = 25
end
love.graphics.draw(frag_text, x,y, 0, Zoom)
-- render cursor if necessary
local frag_len = utf8.len(frag)
if line_index == cursor_line then
if pos <= cursor_pos and pos + frag_len > cursor_pos then
-- cursor
love.graphics.print('_', x+Text.cursor_x2(frag, cursor_pos-pos+1), y+6) -- drop the cursor down a bit to account for the increased font size
end
end
x = x + frag_width
pos = pos + frag_len
edit in text.lua at line 73

[3.37]

[3.37]

return y
edit in text.lua at line 75

[3.41]

[3.41]

-- manual tests:
-- draw with small line_width of 100
-- short words break on spaces
-- long words break when they must
edit in text.lua at line 95

[3.453]

[3.453]

Lines[Cursor_line].fragments = nil
edit in text.lua at line 105

[3.921]

[3.921]

Lines[Cursor_line].fragments = nil
edit in text.lua at line 162

[3.2556]

[3.2556]

Lines[Cursor_line].fragments = nil
edit in text.lua at line 172

[3.2907]

[3.2907]

Lines[Cursor_line-1].fragments = nil
edit in text.lua at line 188

[3.3565]

[3.3565]

Lines[Cursor_line].fragments = nil
edit in text.lua at line 197

[3.3861]

[3.3861]

Lines[Cursor_line].fragments = nil
edit in text.lua at line 322

[3.1438]

[3.1438]

function Text.cursor_x2(s, cursor_pos)
local s_before_cursor = s:sub(1, cursor_pos-1)
local text_before_cursor = love.graphics.newText(love.graphics.getFont(), s_before_cursor)
return math.floor(text_before_cursor:getWidth()*Zoom)
end
replacement in main.lua at line 136

[3.213]→[3.267:328](∅→∅),[3.1510]→[3.267:328](∅→∅)

Text.draw(line, line_index, Cursor_line, Cursor_pos)

[3.213]

[2.56]

y = Text.draw(line, 100, line_index, Cursor_line, Cursor_pos)
--? y = Text.draw(line, Drawing_width, line_index, Cursor_line, Cursor_pos)
edit in main.lua at line 142

[10.416]

[10.416]

--? os.exit(1)