about summary refs log tree commit diff stats
path: root/main.lua
blob: 5c1abd9131ee7e1c90593d4b630fb4046472dfe2 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
local utf8 = require 'utf8'
require 'keychord'
require 'file'
require 'button'
local Text = require 'text'
local Drawing = require 'drawing'
local geom = require 'geom'
require 'help'
require 'icons'

-- a line is either text or a drawing
-- a text is a table with:
--    mode = 'text'
--    string data
--    screen_line_starting_pos: optional array of grapheme indices if it wraps over more than one screen line
-- a drawing is a table with:
--    mode = 'drawing'
--    a (y) coord in pixels (updated while painting screen),
--    a (h)eight,
--    an array of points, and
--    an array of shapes
-- a shape is a table containing:
--    a mode
--    an array points for mode 'freehand' (raw x,y coords; freehand drawings don't pollute the points array of a drawing)
--    an array vertices for mode 'polygon', 'rectangle', 'square'
--    p1, p2 for mode 'line'
--    p1, p2, arrow-mode for mode 'arrow-line'
--    center, radius for mode 'circle'
--    center, radius, start_angle, end_angle for mode 'arc'
-- Unless otherwise specified, coord fields are normalized; a drawing is always 256 units wide
-- The field names are carefully chosen so that switching modes in midstream
-- remembers previously entered points where that makes sense.
--
-- Open question: how to maintain Sketchpad-style constraints? Answer for now:
-- we don't. Constraints operate only for the duration of a drawing operation.
-- We'll continue to persist them just to keep the option open to continue
-- solving for them. But for now, this is a program to create static drawings
-- once, and read them passively thereafter.
Lines = {{mode='text', data=''}}
Screen_top_line = 1
Screen_bottom_line = 1
Cursor_line = 1
Cursor_pos = 1  -- in Unicode codepoints, from 1 to utf8.len(line) + 1

Screen_width, Screen_height, Screen_flags = 0, 0, nil

Current_drawing_mode = 'line'
Previous_drawing_mode = nil

Line_width = nil  -- maximum width available to either text or drawings, in pixels

Zoom = 1.5

Filename = 'lines.txt'

function love.load(arg)
  -- maximize window
  love.window.setMode(0, 0)  -- maximize
  Screen_width, Screen_height, Screen_flags = love.window.getMode()
  -- shrink slightly to account for window decoration
  Screen_width = Screen_width-100
  Screen_height = Screen_height-100
  love.window.setMode(Screen_width, Screen_height)
  love.window.setTitle('Text with Lines')
  Line_width = math.floor(Screen_width/2/40)*40
  love.keyboard.setTextInput(true)  -- bring up keyboard on touch screen
  love.keyboard.setKeyRepeat(true)
  if #arg > 0 then
    Filename = arg[1]
  end
  Lines = load_from_disk(Filename)
  for i,line in ipairs(Lines) do
    if line.mode == 'text' then
      Cursor_line = i
      break
    end
  end
  love.window.setTitle('Text with Lines - '..Filename)
end

function love.filedropped(file)
  Filename = file:getFilename()
  file:open('r')
  Lines = load_from_file(file)
  file:close()
  for i,line in ipairs(Lines) do
    if line.mode == 'text' then
      Cursor_line = i
      break
    end
  end
  love.window.setTitle('Text with Lines - '..Filename)
end

function love.draw()
  Button_handlers = {}
  love.graphics.setColor(1, 1, 1)
  love.graphics.rectangle('fill', 0, 0, Screen_width-1, Screen_height-1)
  love.graphics.setColor(0, 0, 0)
  for line_index,line in ipairs(Lines) do
    line.y = nil
  end
  local y = 15
  for line_index,line in ipairs(Lines) do
    if y > Screen_height then break end
    if line_index >= Screen_top_line then
      Screen_bottom_line = line_index
      if line.mode == 'text' and line.data == '' then
        line.y = y
        button('draw', {x=4,y=y+4, w=12,h=12, color={1,1,0},
          icon = icon.insert_drawing,
          onpress1 = function()
                       table.insert(Lines, line_index, {mode='drawing', y=y, h=256/2, points={}, shapes={}, pending={}})
                       if Cursor_line >= line_index then
                         Cursor_line = Cursor_line+1
                       end
                     end})
          if line_index == Cursor_line then
            -- cursor
            love.graphics.setColor(1,0,0)
            love.graphics.circle('fill', 25,y+math.floor(15*Zoom), 2)
            love.graphics.setColor(0,0,0)
          end
        y = y + math.floor(15*Zoom)  -- text height
      elseif line.mode == 'drawing' then
        y = y+10 -- padding
        line.y = y
        Drawing.draw(line)
        y = y + Drawing.pixels(line.h) + 10 -- padding
      else
        line.y = y
        y = Text.draw(line, Line_width, line_index, Cursor_line, Cursor_pos)
        y = y + math.floor(15*Zoom)  -- text height
      end
    end
  end
--?   os.exit(1)
end

function love.update(dt)
  Drawing.update(dt)
end

function love.mousepressed(x,y, mouse_button)
  propagate_to_button_handlers(x,y, mouse_button)

  for line_index,line in ipairs(Lines) do
    if line.mode == 'text' then
      if Text.in_line(line, x,y) then
        Text.move_cursor(line_index, line, x, y)
      end
    elseif line.mode == 'drawing' then
      if Drawing.in_drawing(line, x, y) then
        Drawing.mouse_pressed(line, x,y, button)
      end
    end
  end
end

function love.mousereleased(x,y, button)
  Drawing.mouse_released(x,y, button)
end

function keychord_pressed(chord)
  if love.mouse.isDown('1') or chord:sub(1,2) == 'C-' then
    Drawing.keychord_pressed(chord)
  elseif chord == 'escape' and love.mouse.isDown('1') then
    local drawing = Drawing.current_drawing()
    if drawing then
      drawing.pending = {}
    end
  elseif chord == 'pagedown' then
    Screen_top_line = Screen_bottom_line
    Cursor_line = Screen_top_line
    Cursor_pos = 1
    Text.move_cursor_down_to_next_text_line_while_scrolling_again_if_necessary()
  elseif chord == 'pageup' then
    -- duplicate some logic from love.draw
    local y = Screen_height
    while y >= 0 do
      if Screen_top_line == 1 then break end
      y = y - math.floor(15*Zoom)
      if Lines[Screen_top_line].mode == 'drawing' then
        y = y - Drawing.pixels(Lines[Screen_top_line].h)
      end
      Screen_top_line = Screen_top_line - 1
    end
    if Cursor_line ~= Screen_top_line then
      Cursor_pos = 1
    end
    Cursor_line = Screen_top_line
    Text.move_cursor_down_to_next_text_line_while_scrolling_again_if_necessary()
  else
    Text.keychord_pressed(chord)
  end
end

function love.keyreleased(key, scancode)
end