268 lines
8.8 KiB
Lua
268 lines
8.8 KiB
Lua
local utf8 = require 'utf8'
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require 'app'
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require 'test'
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require 'keychord'
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require 'file'
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require 'button'
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local Text = require 'text'
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local Drawing = require 'drawing'
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local geom = require 'geom'
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require 'help'
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require 'icons'
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-- run in both tests and a real run
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function App.initialize_globals()
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-- a line is either text or a drawing
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-- a text is a table with:
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-- mode = 'text'
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-- string data
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-- screen_line_starting_pos: optional array of grapheme indices if it wraps over more than one screen line
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-- a drawing is a table with:
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-- mode = 'drawing'
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-- a (y) coord in pixels (updated while painting screen),
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-- a (h)eight,
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-- an array of points, and
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-- an array of shapes
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-- a shape is a table containing:
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-- a mode
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-- an array points for mode 'freehand' (raw x,y coords; freehand drawings don't pollute the points array of a drawing)
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-- an array vertices for mode 'polygon', 'rectangle', 'square'
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-- p1, p2 for mode 'line'
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-- p1, p2, arrow-mode for mode 'arrow-line'
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-- center, radius for mode 'circle'
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-- center, radius, start_angle, end_angle for mode 'arc'
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-- Unless otherwise specified, coord fields are normalized; a drawing is always 256 units wide
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-- The field names are carefully chosen so that switching modes in midstream
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-- remembers previously entered points where that makes sense.
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--
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-- Open question: how to maintain Sketchpad-style constraints? Answer for now:
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-- we don't. Constraints operate only for the duration of a drawing operation.
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-- We'll continue to persist them just to keep the option open to continue
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-- solving for them. But for now, this is a program to create static drawings
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-- once, and read them passively thereafter.
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Lines = {{mode='text', data=''}}
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-- Lines can be too long to fit on screen, in which case they _wrap_ into
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-- multiple _screen lines_.
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--
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-- Therefore, any potential location for the cursor can be described in two ways:
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-- * schema 1: As a combination of line index and position within a line (in utf8 codepoint units)
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-- * schema 2: As a combination of line index, screen line index within the line, and a position within the screen line.
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--
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-- Most of the time we'll only persist positions in schema 1, translating to
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-- schema 2 when that's convenient.
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Cursor1 = {line=1, pos=1} -- position of cursor
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Screen_top1 = {line=1, pos=1} -- position of start of screen line at top of screen
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Screen_bottom1 = {line=1, pos=1} -- position of start of screen line at bottom of screen
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Cursor_x, Cursor_y = 0, 0 -- in pixels
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Current_drawing_mode = 'line'
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Previous_drawing_mode = nil
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Zoom = 1.5
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Filename = love.filesystem.getUserDirectory()..'/lines.txt'
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end -- App.initialize_globals
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function App.initialize(arg)
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love.keyboard.setTextInput(true) -- bring up keyboard on touch screen
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love.keyboard.setKeyRepeat(true)
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-- maximize window
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love.window.setMode(0, 0) -- maximize
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App.screen.width, App.screen.height = love.window.getMode()
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-- shrink slightly to account for window decoration
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App.screen.width = App.screen.width-100
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App.screen.height = App.screen.height-100
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love.window.setMode(App.screen.width, App.screen.height)
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--? App.screen.width = 120
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--? App.screen.height = 200
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--? love.window.setMode(App.screen.width, App.screen.height)
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-- maximum width available to either text or drawings, in pixels
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Line_width = math.floor(App.screen.width/2/40)*40
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--? Line_width = 100
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-- still in App.initialize
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if #arg > 0 then
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Filename = arg[1]
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end
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Lines = load_from_disk(Filename)
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for i,line in ipairs(Lines) do
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if line.mode == 'text' then
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Cursor1.line = i
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break
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end
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end
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love.window.setTitle('Text with Lines - '..Filename)
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end -- App.initialize
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function App.filedropped(file)
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Filename = file:getFilename()
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file:open('r')
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Lines = load_from_file(file)
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file:close()
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for i,line in ipairs(Lines) do
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if line.mode == 'text' then
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Cursor1.line = i
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break
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end
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end
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love.window.setTitle('Text with Lines - '..Filename)
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end
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function App.draw()
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Button_handlers = {}
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love.graphics.setColor(1, 1, 1)
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love.graphics.rectangle('fill', 0, 0, App.screen.width-1, App.screen.height-1)
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love.graphics.setColor(0, 0, 0)
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for line_index,line in ipairs(Lines) do
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line.y = nil
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end
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assert(Screen_top1.line < Cursor1.line or (Screen_top1.line == Cursor1.line and Screen_top1.pos <= Cursor1.pos))
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local y = 15
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--? print('== draw')
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for line_index,line in ipairs(Lines) do
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--? print('draw:', y, line_index, line)
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if y + math.floor(15*Zoom) > App.screen.height then break end
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--? print('a')
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if line_index >= Screen_top1.line then
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Screen_bottom1.line = line_index
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if line.mode == 'text' and line.data == '' then
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line.y = y
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button('draw', {x=4,y=y+4, w=12,h=12, color={1,1,0},
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icon = icon.insert_drawing,
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onpress1 = function()
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table.insert(Lines, line_index, {mode='drawing', y=y, h=256/2, points={}, shapes={}, pending={}})
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if Cursor1.line >= line_index then
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Cursor1.line = Cursor1.line+1
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end
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end})
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if line_index == Cursor1.line then
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Text.draw_cursor(25, y)
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end
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y = y + math.floor(15*Zoom) -- text height
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elseif line.mode == 'drawing' then
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y = y+10 -- padding
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line.y = y
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Drawing.draw(line)
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y = y + Drawing.pixels(line.h) + 10 -- padding
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else
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--? print('text')
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line.y = y
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y, Screen_bottom1.pos = Text.draw(line, Line_width, line_index)
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y = y + math.floor(15*Zoom) -- text height
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--? print('=> y', y)
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end
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end
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end
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--? print('screen bottom: '..tostring(Screen_bottom1.pos)..' in '..tostring(Lines[Screen_bottom1.line].data))
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--? os.exit(1)
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end
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function App.update(dt)
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Drawing.update(dt)
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end
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function App.mousepressed(x,y, mouse_button)
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propagate_to_button_handlers(x,y, mouse_button)
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for line_index,line in ipairs(Lines) do
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if line.mode == 'text' then
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if Text.in_line(line, x,y) then
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Text.move_cursor(line_index, line, x, y)
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end
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elseif line.mode == 'drawing' then
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if Drawing.in_drawing(line, x, y) then
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Drawing.mouse_pressed(line, x,y, button)
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end
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end
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end
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end
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function App.mousereleased(x,y, button)
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Drawing.mouse_released(x,y, button)
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end
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function App.textinput(t)
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if Current_drawing_mode == 'name' then
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local drawing = Lines.current
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local p = drawing.points[drawing.pending.target_point]
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p.name = p.name..t
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else
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Text.textinput(t)
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end
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save_to_disk(Lines, Filename)
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end
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function App.keychord_pressed(chord)
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if love.mouse.isDown('1') or chord:sub(1,2) == 'C-' then
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Drawing.keychord_pressed(chord)
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elseif chord == 'escape' and love.mouse.isDown('1') then
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local drawing = Drawing.current_drawing()
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if drawing then
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drawing.pending = {}
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end
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elseif chord == 'escape' and not love.mouse.isDown('1') then
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for _,line in ipairs(Lines) do
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if line.mode == 'drawing' then
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line.show_help = false
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end
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end
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elseif Current_drawing_mode == 'name' then
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if chord == 'return' then
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Current_drawing_mode = Previous_drawing_mode
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Previous_drawing_mode = nil
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else
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local drawing = Lines.current
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local p = drawing.points[drawing.pending.target_point]
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if chord == 'escape' then
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p.name = nil
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elseif chord == 'backspace' then
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local len = utf8.len(p.name)
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local byte_offset = utf8.offset(p.name, len-1)
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p.name = string.sub(p.name, 1, byte_offset)
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end
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end
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save_to_disk(Lines, Filename)
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elseif chord == 'pagedown' then
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Screen_top1.line = Screen_bottom1.line
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Screen_top1.pos = Screen_bottom1.pos
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--? print('setting top to', Screen_top1.line, Screen_top1.pos)
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Cursor1.line = Screen_top1.line
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Cursor1.pos = Screen_top1.pos
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Text.move_cursor_down_to_next_text_line_while_scrolling_again_if_necessary()
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--? print('top now', Screen_top1.line)
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elseif chord == 'pageup' then
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-- duplicate some logic from love.draw
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local top2 = Text.to2(Screen_top1)
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--? print(App.screen.height)
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local y = App.screen.height - math.floor(15*Zoom)
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while y >= 15 do
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--? print(y, top2.line)
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if Screen_top1.line == 1 and Screen_top1.pos == 1 then break end
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if Lines[Screen_top1.line].mode == 'text' then
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y = y - math.floor(15*Zoom)
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elseif Lines[Screen_top1.line].mode == 'drawing' then
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y = y - 20 - Drawing.pixels(Lines[Screen_top1.line].h)
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end
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top2 = Text.previous_screen_line(top2)
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end
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Screen_top1 = Text.to1(top2)
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Cursor1.line = Screen_top1.line
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Cursor1.pos = Screen_top1.pos
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Text.move_cursor_down_to_next_text_line_while_scrolling_again_if_necessary()
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--? print(Cursor1.line, Cursor1.pos, Screen_top1.line, Screen_top1.pos)
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else
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Text.keychord_pressed(chord)
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end
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end
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function App.keyreleased(key, scancode)
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end
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