akkartik/sum-grid.love - Change H7OEU6WPOKOSKV5RNAM5W62V5SYOY7VEA5VOK6JD5UEBUBIMOKUQC

experimental approach to combining keyboard and mouse while drawing

Desired properties:

fluently draw lots of precise drawings
- requires expressing lots of different kinds of constraints
always know what pressing a key is going to do
when typing, don't care where the mouse pointer is

Less important:

discoverability, learnability. Provide a hotkey for help.

Current plan:

chorded keys to modify drawings while mouse button is not pressed
unchorded keys to modify drawings only while mouse button is pressed
make changes while drawing a shape by pressing a key while mouse button is pressed
make changes to a drawing by hovering mouse pointer at a shape and pressing a key (unary operators)
add constraints after drawing by hovering mouse pointer at a shape, pressing a key and moving mouse pointer to a second shape (binary operators)
almost any change can be made to a shape after it's drawn (inspired by Sketchpad)
keys pressed while drawing a shape act as abbreviations to performing the action after drawing

First example in this PR:

you press mouse button, start drawing freehand
you realize you want a simple line, not a freehand stroke
without releasing the mouse button, you press 'l'
now you're drawing a straight line

You could also release the mouse button and finish the stroke, then press 'ctrl-l' while hovering the mouse pointer on the stroke to turn it into a line.

There's an asymmetry here. Strokes require a lot more information, so while you can turn a stroke into a line, you can't turn a line into a stroke.

Strokes are an exception where you can't switch to freehand mode after you start drawing. You have to press C-f before drawing.

Created by Kartik K. Agaram on May 14, 2022

H7OEU6WPOKOSKV5RNAM5W62V5SYOY7VEA5VOK6JD5UEBUBIMOKUQC

Dependencies

In channels

main

Change contents

Insertion in main.lua at line 232 [5.2]

[4.50]

  if love.mouse.isDown('1') then return end
  if in_drawing() then return end

Insertion in main.lua at line 255 [5.2]

[6.1135]

[2.877]

  elseif chord == 'C-f' then
    current_mode = 'freehand'
  elseif love.mouse.isDown('1') and chord == 'l' then
    current_mode = 'line'
    local drawing = current_drawing()
    assert(drawing.pending.mode == 'freehand')
    drawing.pending.mode = 'line'
    drawing.pending.x1 = drawing.pending.points[1].x
    drawing.pending.y1 = drawing.pending.points[1].y

Insertion in main.lua at line 265 [5.2]
[2.906]
[2.906]
```
    current_mode = 'line'
```

Insertion in main.lua at line 279 [5.2]

[3.126]

    end
  end
end
function in_drawing()
  local x, y = love.mouse.getX(), love.mouse.getY()
  for _,drawing in ipairs(lines) do
    if type(drawing) == 'table' then
      if y >= drawing.y and y < drawing.y + pixels(drawing.h) and x >= 12 and x < 12+drawingw then
        return true
      end
    end
  end
  return false
end
function current_drawing()
  local x, y = love.mouse.getX(), love.mouse.getY()
  for _,drawing in ipairs(lines) do
    if type(drawing) == 'table' then
      if y >= drawing.y and y < drawing.y + pixels(drawing.h) and x >= 12 and x < 12+drawingw then
        return drawing
      end

Insertion in main.lua at line 304 [5.2]
[7.125]
[7.125]
```
  return nil
```