beginnings of a module for the text editor

[?]

May 18, 2022, 3:29 AM

BULPIBEGL7TMK6CVIE7IS7WGAHGOSUJBGJSFQK542MOWGHP2ADQQC

Dependencies

[2] TRK4TSN7 more precise cursor positioning
[3] BLWAYPKV extract a module
[4] 7IKRRESB longer names for indices in long loops
[5] H7OEU6WP experimental approach to combining keyboard and mouse while drawing
[6] 2INHXC3K position cursor by clicking on text
[7] PRPPZGDY speed up some obvious common cases
[8] ZD63LJ2T bugfix: keep the click to create a new drawing from creating a new shape in the drawing
[9] JS6JSYOT online contextual help
[10] TNTYISW6 rename
[11] JVRL5TWL store device-independent coordinates inside drawings
[12] 7RN3AETY bugfix: text sometimes getting colored like drawing borders
[13] BJ5X5O4A let's prevent the text cursor from ever getting on a drawing
[14] VVXVV2D2 change data model; text can now have metadata
[15] V5TP27FP ctrl-+ and ctrl-- to adjust font size
[16] XX7G2FFJ intermingle freehand line drawings with text
[17] WDWXNW7V slightly strange way to move points
[18] HJ3PM2VT .
[19] AVQ5MC5D finish uppercasing all globals
[20] IHG5RXP5 allow text to be typed while mouse hovers over drawing
[21] 3SYFA5JQ show cursor even on empty lines
[22] RJGZD4IN binary search to most natural up/down with proportional fonts
[23] IFGAJAF7 add a level of indirection to vertices of shapes
[24] FBDRL6LH delete points or shapes
[25] KHFU5NFD bugfix: up/down across drawings
[26] JCSLDGAH beginnings of support for multiple shapes
[27] M36DBSDE bit more polish to help screen
[28] HRWN5V6J Devine's suggestion to try to live with just freehand
[29] 3CS5KKCI up/down cursor movement
[30] 3D5RFWHV stop handling drawings in cursor_pos computations
[31] MGOQ5XAV start uppercasing globals
[*] R5QXEHUI somebody stop me
[*] OTIBCAUJ love2d scaffold

Change contents

file addition: text.lua (----------)

[33.2]

-- primitives for editing text
Text = {}

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

function Text.nearest_cursor_pos(line, x, hint)
if x == 0 then
return 1
end
local max_x = Text.cursor_x(line, #line+1)
if x > max_x then
return #line+1
end
local currx = Text.cursor_x(line, hint)
if currx > x-2 and currx < x+2 then
return hint
end
local left, right = 1, #line+1
if currx > x then
right = hint
else
left = hint
end
while left < right-1 do
local curr = math.floor((left+right)/2)
local currxmin = Text.cursor_x(line, curr)
local currxmax = Text.cursor_x(line, curr+1)
if currxmin <= x and x < currxmax then
return curr
end
if currxmin > x then
right = curr
else
left = curr
end
end
return right
end

function Text.cursor_x(line_data, cursor_pos)
local line_before_cursor = line_data:sub(1, cursor_pos-1)
local text_before_cursor = love.graphics.newText(love.graphics.getFont(), line_before_cursor)
return 25+text_before_cursor:getWidth()*Zoom
end

return Text
edit in main.lua at line 4

[5.19]

[3.31]

local Text = require 'text'
replacement in main.lua at line 124

[5.1249]→[5.2:38](∅→∅),[5.38]→[5.469:546](∅→∅),[5.546]→[5.1410:1456](∅→∅),[5.1456]→[4.263:303](∅→∅),[4.303]→[5.32:50](∅→∅),[5.1487]→[5.32:50](∅→∅),[5.32]→[5.32:50](∅→∅),[5.50]→[5.1488:1629](∅→∅),[5.142]→[5.411:421](∅→∅),[5.158]→[5.411:421](∅→∅),[5.695]→[5.411:421](∅→∅),[5.1629]→[5.411:421](∅→∅),[5.411]→[5.411:421](∅→∅)

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

[5.1249]

[5.1294]

Text.draw(line, line_index, Cursor_line, y, Cursor_pos)
replacement in main.lua at line 165

[4.380]→[5.1958:2015](∅→∅),[5.1958]→[5.1958:2015](∅→∅)

Cursor_pos = nearest_cursor_pos(line.data, x, 1)

[4.380]

[5.361]

Cursor_pos = Text.nearest_cursor_pos(line.data, x, 1)
replacement in main.lua at line 536

[5.4825]→[5.4779:4851](∅→∅)

local old_x = cursor_x(Lines[new_cursor_line].data, Cursor_pos)

[5.4825]

[5.4851]

local old_x = Text.cursor_x(Lines[new_cursor_line].data, Cursor_pos)
replacement in main.lua at line 538

[5.4889]→[5.4889:4973](∅→∅)

Cursor_pos = nearest_cursor_pos(Lines[Cursor_line].data, old_x, Cursor_pos)

[5.4889]

[5.1874]

Cursor_pos = Text.nearest_cursor_pos(Lines[Cursor_line].data, old_x, Cursor_pos)
replacement in main.lua at line 548

[5.5121]→[5.5061:5133](∅→∅)

local old_x = cursor_x(Lines[new_cursor_line].data, Cursor_pos)

[5.5121]

[5.5133]

local old_x = Text.cursor_x(Lines[new_cursor_line].data, Cursor_pos)
replacement in main.lua at line 550

[5.5171]→[5.5171:5255](∅→∅)

Cursor_pos = nearest_cursor_pos(Lines[Cursor_line].data, old_x, Cursor_pos)

[5.5171]

[5.2218]

Cursor_pos = Text.nearest_cursor_pos(Lines[Cursor_line].data, old_x, Cursor_pos)
edit in main.lua at line 707

[5.552]→[5.552:588](∅→∅),[5.46]→[5.588:739](∅→∅),[5.2966]→[5.588:739](∅→∅),[5.588]→[5.588:739](∅→∅),[5.739]→[5.6231:6278](∅→∅),[5.283]→[5.778:783](∅→∅),[5.662]→[5.778:783](∅→∅),[5.6278]→[5.778:783](∅→∅),[5.778]→[5.778:783](∅→∅),[5.783]→[5.157:200](∅→∅),[5.95]→[5.820:856](∅→∅),[5.200]→[5.820:856](∅→∅),[5.3016]→[5.820:856](∅→∅),[5.820]→[5.820:856](∅→∅),[5.856]→[5.201:383](∅→∅),[5.383]→[5.856:889](∅→∅),[5.856]→[5.856:889](∅→∅),[5.889]→[5.384:450](∅→∅),[5.450]→[5.889:959](∅→∅),[5.889]→[5.889:959](∅→∅),[5.959]→[2.1:130](∅→∅),[2.130]→[5.1038:1056](∅→∅),[5.1038]→[5.1038:1056](∅→∅),[5.1056]→[5.576:584](∅→∅),[5.576]→[5.576:584](∅→∅),[5.584]→[2.131:156](∅→∅),[2.156]→[5.1079:1133](∅→∅),[5.1079]→[5.1079:1133](∅→∅),[5.584]→[5.482:488](∅→∅),[5.1072]→[5.482:488](∅→∅),[5.1133]→[5.482:488](∅→∅),[5.482]→[5.482:488](∅→∅),[5.488]→[5.1134:1149](∅→∅),[5.1149]→[5.488:493](∅→∅),[5.488]→[5.488:493](∅→∅)

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 25+text_before_cursor:getWidth()*Zoom
end

function nearest_cursor_pos(line, x, hint)
if x == 0 then
return 1
end
local max_x = cursor_x(line, #line+1)
if x > max_x then
return #line+1
end
local currx = cursor_x(line, hint)
if currx > x-2 and currx < x+2 then
return hint
end
local left, right = 1, #line+1
if currx > x then
right = hint
else
left = hint
end
while left < right-1 do
local curr = math.floor((left+right)/2)
local currxmin = cursor_x(line, curr)
local currxmax = cursor_x(line, curr+1)
if currxmin <= x and x < currxmax then
return curr
end
if currxmin > x then
right = curr
else
left = curr
end
end
return right
end