204 lines
6.3 KiB
Lua
204 lines
6.3 KiB
Lua
local utf8 = require 'utf8'
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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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-- 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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Cursor_line = 1
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Cursor_pos = 1 -- in Unicode codepoints, from 1 to utf8.len(line) + 1
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Screen_width, Screen_height, Screen_flags = 0, 0, nil
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Cursor_x, Cursor_y = 0, 0 -- in pixels
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-- scrolling support
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Screen_top_line = 1
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Screen_bottom_line = 1
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Top_screen_line_starting_pos = 1 -- when top of screen starts in between a wrapped line
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Bottom_screen_line_starting_pos = 1 -- when bottom of screen starts in between a wrapped line
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Current_drawing_mode = 'line'
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Previous_drawing_mode = nil
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Line_width = nil -- maximum width available to either text or drawings, in pixels
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Zoom = 1.5
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Filename = 'lines.txt'
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function love.load(arg)
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-- maximize window
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love.window.setMode(0, 0) -- maximize
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Screen_width, Screen_height, Screen_flags = love.window.getMode()
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-- shrink slightly to account for window decoration
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Screen_width = Screen_width-100
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Screen_height = Screen_height-100
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love.window.setMode(Screen_width, Screen_height)
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love.window.setTitle('Text with Lines')
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--? Line_width = 100
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Line_width = math.floor(Screen_width/2/40)*40
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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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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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Cursor_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 love.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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Cursor_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 love.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, Screen_width-1, 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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local y = 15
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for line_index,line in ipairs(Lines) do
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if y > Screen_height then break end
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if line_index >= Screen_top_line then
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Screen_bottom_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 Cursor_line >= line_index then
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Cursor_line = Cursor_line+1
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end
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end})
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if line_index == Cursor_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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line.y = y
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y = Text.draw(line, Line_width, line_index)
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y = y + math.floor(15*Zoom) -- text height
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end
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end
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end
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--? os.exit(1)
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end
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function love.update(dt)
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Drawing.update(dt)
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end
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function love.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 love.mousereleased(x,y, button)
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Drawing.mouse_released(x,y, button)
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end
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function 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 == 'pagedown' then
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Screen_top_line = Screen_bottom_line
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Cursor_line = Screen_top_line
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Cursor_pos = 1
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Text.move_cursor_down_to_next_text_line_while_scrolling_again_if_necessary()
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elseif chord == 'pageup' then
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-- duplicate some logic from love.draw
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local y = Screen_height
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while y >= 0 do
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if Screen_top_line == 1 then break end
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y = y - math.floor(15*Zoom)
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if Lines[Screen_top_line].mode == 'drawing' then
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y = y - Drawing.pixels(Lines[Screen_top_line].h)
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end
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Screen_top_line = Screen_top_line - 1
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end
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if Cursor_line ~= Screen_top_line then
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Cursor_pos = 1
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end
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Cursor_line = Screen_top_line
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Text.move_cursor_down_to_next_text_line_while_scrolling_again_if_necessary()
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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 love.keyreleased(key, scancode)
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end
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