commit 1894988ac3ba03a9ed884d1e3d8c9672f722c8bf
Author: jill <oatmealine@disroot.org>
Date:   Fri Sep 17 22:24:26 2021 +0300

    init commit

diff --git a/LICENSE b/LICENSE
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index 0000000..90d4390
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,16 @@
+Box of Eases
+
+Copyright (C) 2021 Jill "oatmealine" Monoids <oatmealine@disroot.org>
+
+This program is free software: you can redistribute it and/or modify it under
+the terms of the GNU Affero General Public License as published by the Free
+Software Foundation, either version 3 of the License, or (at your option)
+any later version.
+
+This program is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+details.
+
+You should have received a copy of the GNU Affero General Public License along
+with this program. If not, see <https://www.gnu.org/licenses/>.
diff --git a/README.md b/README.md
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--- /dev/null
+++ b/README.md
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+# Box of Eases (working title)
+
+![logo](./logo.png)
+
+A simple Love2D application to create, preview and mix eases, meant for NITG modding.
+
+## How-to Install
+
+### Manual/Development (currently the only method)
+
+Download Love2D for your operating system here: https://love2d.org/
+
+Then launch the game like so: https://love2d.org/wiki/Getting_Started#Running_Games
+
+## Screenshots
+
+![Previewing eases](./screenshot1.png)
+
+![Mixing eases](./screenshot2.png)
\ No newline at end of file
diff --git a/conf.lua b/conf.lua
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index 0000000..f9c66a3
--- /dev/null
+++ b/conf.lua
@@ -0,0 +1,5 @@
+function love.conf(t)
+  t.window.resizable = true
+  t.window.title = 'Box of Eases'
+  t.window.icon = 'logo.png'
+end
diff --git a/easelib.lua b/easelib.lua
new file mode 100644
index 0000000..320ed59
--- /dev/null
+++ b/easelib.lua
@@ -0,0 +1,132 @@
+local self = {}
+
+local sqrt = math.sqrt
+local sin = math.sin
+local asin = math.asin
+local cos = math.cos
+local pow = math.pow
+local exp = math.exp
+local pi = math.pi
+local abs = math.abs
+
+self = setmetatable(self, {
+  __index = function(s, i)
+    for _,v in ipairs(self) do
+      if v[1] == i then
+        return v[2]
+      end
+    end
+  end
+})
+
+table.insert(self, {'linear', function(t) return t end})
+table.insert(self, {'instant', function() return 1 end})
+
+table.insert(self, {'bounce', function(t) return 4 * t * (1 - t) end})
+table.insert(self, {'tri', function(t) return 1 - abs(2 * t - 1) end})
+table.insert(self, {'bell', function(t) return self.inOutQuint(self.tri(t)) end})
+table.insert(self, {'pop', function(t) return 3.5 * (1 - t) * (1 - t) * sqrt(t) end})
+table.insert(self, {'tap', function(t) return 3.5 * t * t * sqrt(1 - t) end})
+table.insert(self, {'pulse', function(t) return t < .5 and self.tap(t * 2) or -self.pop(t * 2 - 1) end})
+
+table.insert(self, {'spike', function(t) return exp(-10 * abs(2 * t - 1)) end})
+table.insert(self, {'inverse', function(t) return t * t * (1 - t) * (1 - t) / (0.5 - t) end})
+
+table.insert(self, {'inSine', function(x)
+	return 1 - cos(x * (pi * 0.5))
+end})
+
+table.insert(self, {'outSine', function(x)
+	return sin(x * (pi * 0.5))
+end})
+
+table.insert(self, {'inOutSine', function(x)
+	return 0.5 - 0.5 * cos(x * pi)
+end})
+
+table.insert(self, {'inQuad', function(t) return t * t end})
+table.insert(self, {'outQuad', function(t) return -t * (t - 2) end})
+table.insert(self, {'inOutQuad', function(t)
+	t = t * 2
+	if t < 1 then
+		return 0.5 * t ^ 2
+	else
+		return 1 - 0.5 * (2 - t) ^ 2
+	end
+end})
+table.insert(self, {'inCubic', function(t) return t * t * t end})
+table.insert(self, {'outCubic', function(t) return 1 - (1 - t) ^ 3 end})
+table.insert(self, {'inOutCubic', function(t)
+	t = t * 2
+	if t < 1 then
+		return 0.5 * t ^ 3
+	else
+		return 1 - 0.5 * (2 - t) ^ 3
+	end
+end})
+table.insert(self, {'inQuart', function(t) return t * t * t * t end})
+table.insert(self, {'outQuart', function(t) return 1 - (1 - t) ^ 4 end})
+table.insert(self, {'inOutQuart', function(t)
+	t = t * 2
+	if t < 1 then
+		return 0.5 * t ^ 4
+	else
+		return 1 - 0.5 * (2 - t) ^ 4
+	end
+end})
+table.insert(self, {'inQuint', function(t) return t ^ 5 end})
+table.insert(self, {'outQuint', function(t) return 1 - (1 - t) ^ 5 end})
+table.insert(self, {'inOutQuint', function(t)
+	t = t * 2
+	if t < 1 then
+		return 0.5 * t ^ 5
+	else
+		return 1 - 0.5 * (2 - t) ^ 5
+	end
+end})
+table.insert(self, {'inExpo', function(t) return 1000 ^ (t - 1) - 0.001 end})
+table.insert(self, {'outExpo', function(t) return 1.001 - 1000 ^ -t end})
+table.insert(self, {'inOutExpo', function(t)
+	t = t * 2
+	if t < 1 then
+		return 0.5 * 1000 ^ (t - 1) - 0.0005
+	else
+		return 1.0005 - 0.5 * 1000 ^ (1 - t)
+	end
+end})
+table.insert(self, {'inCirc', function(t) return 1 - sqrt(1 - t * t) end})
+table.insert(self, {'outCirc', function(t) return sqrt(-t * t + 2 * t) end})
+table.insert(self, {'inOutCirc', function(t)
+	t = t * 2
+	if t < 1 then
+		return 0.5 - 0.5 * sqrt(1 - t * t)
+	else
+		t = t - 2
+		return 0.5 + 0.5 * sqrt(1 - t * t)
+	end
+end})
+
+table.insert(self, {'outBounce', function(t)
+	if t < 1 / 2.75 then
+		return 7.5625 * t * t
+	elseif t < 2 / 2.75 then
+		t = t - 1.5 / 2.75
+		return 7.5625 * t * t + 0.75
+	elseif t < 2.5 / 2.75 then
+		t = t - 2.25 / 2.75
+		return 7.5625 * t * t + 0.9375
+	else
+		t = t - 2.625 / 2.75
+		return 7.5625 * t * t + 0.984375
+	end
+end})
+table.insert(self, {'inBounce', function(t) return 1 - self.outBounce(1 - t) end})
+table.insert(self, {'inOutBounce', function(t)
+	if t < 0.5 then
+		return self.inBounce(t * 2) * 0.5
+	else
+		return self.outBounce(t * 2 - 1) * 0.5 + 0.5
+	end
+end})
+
+return self
diff --git a/logo.png b/logo.png
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index 0000000..07fda80
Binary files /dev/null and b/logo.png differ
diff --git a/main.lua b/main.lua
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index 0000000..14a104e
--- /dev/null
+++ b/main.lua
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+local easelib = require 'easelib'
+
+-- utils
+
+local function keys(t)
+  local k = {}
+  for n in pairs(t) do table.insert(k, n) end
+  return k
+end
+local function skeys(t)
+  local k = {}
+  for n,v in pairs(t) do table.insert(k, {n, v}) end
+  table.sort(k, function(a, b) return a[2].i < b[2].i end)
+  local k2 = {}
+  for _,v in ipairs(k) do table.insert(k2, v[1]) end
+  return k2
+end
+
+local function mix(x, y, a)
+  return x * (1 - a) + y * a
+end
+
+-- eases
+
+local function mixEase(e1, e2, point)
+  if not point then point = 0.5 end
+
+  return function(a)
+    if a < point then
+      return e1(a / point) * point
+    else
+      return e2((a - point) / (1 - point)) * (1 - point) + point
+    end
+  end
+end
+
+local eases = {}
+for i,v in pairs(easelib) do
+  local min = 0
+  
+  local q = 10
+  for i = 0, q do
+    local s = v[2](i / q)
+    if s < 0 then min = -1 end
+  end
+
+  eases[v[1]] = {
+    f = v[2],
+    max = 1,
+    min = min,
+    i = i
+  }
+end
+
+local ease
+local minEase = false
+
+-- rendering constants
+
+local padding = 6
+local margin = 4
+local quality = 256
+
+local mixpoint = 0.5
+local oldmixpoint = 0.5
+local mixpointtimer = 0 -- easter egg thing
+local mixpointspin = 0
+
+local maxDropdown = 16
+
+-- graph
+
+local graph = {}
+
+-- dropdown bullshit
+
+local dropdowns = {}
+
+local dropdownValueCache = {}
+
+local openDropdown = 0
+local dropdownScroll = 0
+local dropdownScrollE = 0
+
+local function selected(index)
+  return dropdowns[index].options[dropdowns[index].selected]
+end
+
+local function kget(key)
+  for _, v in ipairs(dropdowns) do
+    if v.name == key then
+      return v
+    end
+  end
+end
+
+local function kselected(key)
+  for _, v in ipairs(dropdowns) do
+    if v.name == key then
+      return v.options[v.selected]
+    end
+  end
+end
+
+local dropdownId
+local function insertDropdown(tab, f)
+  dropdownId = dropdownId + 1
+  f.selected = (kget(f.name) or dropdownValueCache[f.name] or {selected = 1}).selected
+  f.selected = (f.selected - 1) % #f.options + 1
+  return table.insert(tab, f)
+end
+local function createDropdowns()
+  local d = {}
+  dropdownId = 0
+  insertDropdown(d, {
+    x = padding,
+    y = padding,
+    width = 128,
+    options = {
+      'Preview Ease',
+      'Mix Eases',
+      'Create Ease'
+    },
+    name = 'mode'
+  })
+  
+  if d[dropdownId].selected == 1 then -- preview ease
+    insertDropdown(d, {
+      x = padding + 128 + padding,
+      y = padding,
+      width = 128,
+      options = skeys(eases),
+      name = 'ease1'
+    })
+    ease = eases[d[dropdownId].options[d[dropdownId].selected]].f
+  elseif d[dropdownId].selected == 2 then -- mix eases
+    insertDropdown(d, {
+      x = padding + 128 + padding,
+      y = padding,
+      width = 128,
+      options = skeys(eases),
+      name = 'ease1'
+    })
+    insertDropdown(d, {
+      x = padding + 128 + padding + 128 + padding,
+      y = padding,
+      width = 128,
+      options = skeys(eases),
+      name = 'ease2'
+    })
+    ease = mixEase(eases[d[dropdownId - 1].options[d[dropdownId - 1].selected]].f, eases[d[dropdownId].options[d[dropdownId].selected]].f, mixpoint)
+  elseif d[dropdownId].selected == 3 then -- create eases
+    insertDropdown(d, {
+      x = padding + 128 + padding,
+      y = padding,
+      width = 128,
+      options = skeys(eases),
+      name = 'ease1'
+    })
+  end
+  
+  minEase = (kselected('ease1') and eases[kselected('ease1')].min == -1) or (kselected('ease2') and eases[kselected('ease2')].min == -1)
+  
+  dropdowns = d
+end
+
+-- rendering
+
+function love.load()
+  createDropdowns()
+end
+
+function love.update(dt)
+  for i = 1, quality do
+    local a = (i - 1) / (quality - 1)
+    if not graph[i] then
+      graph[i] = ease(a)
+    end
+  end
+  for i,v in ipairs(graph) do
+    local a = (i - 1) / (quality - 1)
+    local b = ease(a)
+    if minEase then
+      b = b / 2 + 0.5
+    end
+    graph[i] = mix(v, b, math.min(dt * 18, 1))
+  end
+  
+  mixpointtimer = mix(mixpointtimer + math.abs(mixpoint - oldmixpoint), 0, math.min(dt * 8))
+  oldmixpoint = mix(oldmixpoint, mixpoint, math.min(dt * 20, 1))
+  
+  if mixpointtimer > 2 then
+    mixpointtimer = mixpointtimer - 2
+    mixpointspin = mixpointspin + 4
+  end
+  
+  mixpointspin = mix(mixpointspin, 0, dt * 3)
+  
+  if openDropdown ~= 0 then
+    dropdownScroll = math.max(dropdownScroll, -(#dropdowns[openDropdown].options - maxDropdown))
+    dropdownScroll = math.min(dropdownScroll, 0)
+    dropdownScrollE = mix(dropdownScrollE, dropdownScroll, dt * 10)
+  end
+end
+
+function love.draw()
+  local mode = kget('mode').selected
+  local sw, sh = love.graphics.getDimensions()
+  local mx, my = love.mouse.getPosition()
+  
+  love.graphics.setColor(0.09, 0.09, 0.12, 1)
+  love.graphics.rectangle('fill', 0, 0, sw, sh)
+  love.graphics.setColor(0.08, 0.08, 0.1, 1)
+  love.graphics.rectangle('line', 0, 0, sw, sh)
+  
+  love.graphics.setColor(1, 1, 1, 1)
+  love.graphics.print('Box of Eases by oatmealine', padding, sh - love.graphics.getFont():getHeight() - padding)
+  
+  -- sliders
+  -- yeah we do a lil' hardcoding
+  
+  if mode == 2 then
+    local x, y, w, h = padding, padding * 2 + love.graphics.getFont():getHeight() + margin, 128, 32
+    
+    love.graphics.setColor(0.7, 0.7, 0.7, 0.4)
+    love.graphics.line(x, y + h/2, x + w, y + h/2)
+    
+    local sx, sy = x + w * oldmixpoint, y + h/2
+    local ssize = h * 0.5
+    
+    love.graphics.push()
+    
+    love.graphics.translate(sx, sy)
+    love.graphics.rotate((mixpoint - oldmixpoint) * 4 + mixpointspin * math.pi * 2)
+    
+    love.graphics.setColor(0, 0, 0, 1)
+    if mx > sx - ssize/2 and mx < sx + ssize/2 and my > sy - ssize/2 and my < sy + ssize/2 and openDropdown == 0 then
+      love.graphics.setColor(0.2, 0.2, 0.3, 1)
+    end
+    love.graphics.rectangle('fill', -ssize/2, -ssize/2, ssize, ssize)
+    love.graphics.setColor(1, 1, 1, 1)
+    love.graphics.rectangle('line', -ssize/2, -ssize/2, ssize, ssize)
+    
+    love.graphics.rotate((mixpoint - oldmixpoint) * -2)
+    
+    love.graphics.setColor(1, 1, 1, 1)
+    love.graphics.printf(math.floor(mixpoint * 100)/100, -ssize * 6, ssize - 2, ssize * 12, 'center')
+    
+    love.graphics.pop()
+    
+    if mx > x and mx < x + w and my > y and my < y + h and love.mouse.isDown(1) and openDropdown == 0 then
+      mixpoint = (mx - x) / w
+      createDropdowns()
+    end
+  end
+  
+  -- dropdowns
+  for i,v in ipairs(dropdowns) do
+    local x, y, w, h = v.x, v.y, v.width, love.graphics.getFont():getHeight() + margin
+    
+    love.graphics.setColor(0, 0, 0, 0.3)
+    if love.mouse.getX() > x and love.mouse.getX() < x + w and love.mouse.getY() > y and love.mouse.getY() < y + h then
+      love.graphics.setColor(0.8, 0.8, 1, love.mouse.isDown(1) and 0.4 or 0.3)
+    end
+    love.graphics.rectangle('fill', x, y, w, h)
+    
+    love.graphics.setColor(1, 1, 1, 1)
+        
+    love.graphics.rectangle('line', x, y, w, h)
+    love.graphics.print(selected(i), x + margin/2, y + margin/2)
+    love.graphics.rectangle('line', x + w - h, y, h, h)
+    love.graphics.polygon('line', x + w - h/2 + 0.3 * h, y + h/2 - 0.3 * h, x + w - h/2 - 0.3 * h, y + h/2 - 0.3 * h, x + w - h/2, y + h/2 + 0.3 * h)
+    
+    if openDropdown == i then
+      for i,o in ipairs(v.options) do
+        local x, y, w, h = x, y + i * h, w, h
+        
+        y = y + dropdownScrollE * h
+        local gi = y / h
+        if gi > maxDropdown or gi < 1 then
+          goto continue
+        end
+        
+        local a = 1 - math.min(math.max((1 - (maxDropdown - gi)) * (1 - (math.abs(dropdownScrollE) /(#v.options - maxDropdown))), 0), 1)
+      
+        love.graphics.setColor(0, 0, 0, 0.3 * a)
+        if mx > x and mx < x + w and my > y and my < y + h then
+          love.graphics.setColor(0.8, 0.8, 1, (love.mouse.isDown(1) and 0.4 or 0.3) * a)
+        end
+        love.graphics.rectangle('fill', x, y, w, h)
+      
+        love.graphics.setColor(1, 1, 1, 0.75 * a)
+        love.graphics.rectangle('line', x, y, w, h)
+        
+        love.graphics.setColor(1, 1, 1, 1 * a)
+        love.graphics.print(v.options[i], x + 2, y + 2)
+        
+        ::continue::
+      end
+      
+      -- scrollwheel
+    
+      if #v.options > maxDropdown then
+        local displayed = maxDropdown / #v.options
+        local scroll = math.abs(dropdownScrollE) / (#v.options - maxDropdown)
+        local size = margin
+      
+        love.graphics.setColor(1, 1, 1, 0.9)
+        love.graphics.rectangle('fill', x + w - size, y + h + scroll * (1 - displayed) * (maxDropdown - 1) * h, size, displayed * (maxDropdown - 1) * h)
+      end
+    end
+  end
+ 
+  
+  -- graph
+  
+  if mode == 1 or mode == 2 then
+    local csize = 10 -- preview point size
+    local size = math.min((sw - padding) - ((kget('ease2') or kget('ease1')).x + 128 + padding), sh - padding * 5 - csize)
+    
+    local x, y, w, h = sw - padding - size, padding, size, size
+    love.graphics.setColor(1, 1, 1, 1)
+    love.graphics.rectangle('line', x, y, w, h)
+    
+    -- grid
+    love.graphics.setColor(0.2, 0.2, 0.4, 0.2)
+    local gridsize = 64
+    for gx = 1, gridsize - 2 do
+      love.graphics.line(x + margin + gx * w/gridsize, y + margin, x + margin + gx * w/gridsize, y + h - margin)
+    end
+    for gy = 1, gridsize - 2 do
+      love.graphics.line(x + margin, y + margin + gy * h/gridsize, x + w - margin, y + margin + gy * h/gridsize)
+    end
+    
+    -- mixease point
+    if mode == 2 then
+      love.graphics.setColor(1, 1, 1, 0.8)
+      love.graphics.line(x + margin + mixpoint * w, y, x + margin + mixpoint * w, y + h)
+    end
+    
+    -- preview point
+    local t = love.timer.getTime() % 1
+    love.graphics.setColor(0.4, 0.4, 1, 0.4)
+    love.graphics.line(x + margin + t * w, y, x + margin + t * w, y + h)
+    
+    -- y = 0 point
+    -- todo: this will break with eases that dont have the first point at y0
+    local py = graph[1]
+    love.graphics.setColor(0.7, 0.7, 0.7, 0.4 * (1 - math.abs(py - 0.5) / 0.5))
+    love.graphics.line(x, y + h - py * h, x + w, y + py * h)
+    
+    -- polygone
+    -- this isnt done with a polygon because else itd waste a Bunch of ram and i kinda, dont want to do that?
+    love.graphics.setColor(1, 1, 1, 1)
+    local last = graph[1] or 0
+    for gx = 1, quality - 1 do
+      local a = gx/quality
+      local b = graph[gx + 1] or 0
+      local px, py = x + margin + gx * ((w - margin)/quality), y + h - margin - b * (h - margin * 2)
+      local ox, oy = x + margin + (gx - 1) * ((w - margin)/quality), y + h - margin - last * (h - margin * 2)
+      if math.abs(b - last) < 1 then
+        love.graphics.line(ox, oy, px, py)
+      end
+      last = b
+    end
+    
+    -- preview
+    love.graphics.setColor(1, 1, 1, 0.2)
+    love.graphics.line(x + margin, y + h + padding * 2 + csize/2, x + w - margin, y + h + padding * 2 + csize/2)
+    
+    love.graphics.setColor(0.4, 0.4, 1, 1)
+    local a1 = ease(t)
+    local a2 = ease(math.max(math.min(t - 0.1, 1), 0))
+    local da = a1
+    if love.timer.getTime() % 2 < 1 and math.floor(ease(0) + 0.5) ~= math.floor(ease(1) + 0.5) then
+      da = 1 - da
+    end
+    if minEase then
+      da = da / 2 + 0.5
+    end
+    
+    love.graphics.ellipse('fill', x + margin + (w - margin * 2) * da, y + h + padding * 2 + csize/2, csize * (1 + math.min(math.abs(a1 - a2), 3) * 1.2), csize)
+  end
+end
+
+function love.mousepressed(x, y, m)
+  local clickedDropdown = false
+  for i,v in ipairs(dropdowns) do
+    local h = love.graphics.getFont():getHeight() + margin
+    if openDropdown == 0 then
+      if x > v.x and x < v.x + v.width and y > v.y and y < v.y + h + margin then
+        if m == 1 then
+          openDropdown = i
+          clickedDropdown = true
+          dropdownScroll = 0
+          dropdownScrollE = 0
+        elseif m == 3 then
+          dropdowns[i].selected = math.random(1, #dropdowns[i].options)
+          createDropdowns()
+        end
+      end
+    end
+    if openDropdown == i then
+      if x > v.x and x < v.x + v.width and y > v.y + h and y < v.y + h * (math.min(#v.options, maxDropdown) + 1) and m == 1 then
+        clickedDropdown = true
+      end
+    end
+  end
+  
+  if not clickedDropdown and m == 1 then
+    openDropdown = 0
+  end
+end
+
+function love.mousereleased(x, y, m)
+  for i,v in ipairs(dropdowns) do
+    local h = love.graphics.getFont():getHeight() + margin
+    if openDropdown == i then
+      if x > v.x and x < v.x + v.width and y > v.y + h and y < v.y + h * (math.min(#v.options, maxDropdown) + 1) and m == 1 then
+        v.selected = math.floor((y - v.y) / h - dropdownScrollE)
+        openDropdown = 0
+        dropdownValueCache[v.name] = {selected = v.selected}
+        createDropdowns()
+      end
+    end
+  end
+end
+
+function love.wheelmoved(x, y)
+  if y == 0 then return end
+  
+  if openDropdown ~= 0 then
+    dropdownScroll = dropdownScroll + y
+  else
+    local mx, my = love.mouse.getPosition()
+    for i,v in ipairs(dropdowns) do
+      local h = love.graphics.getFont():getHeight() + margin
+      if mx > v.x and mx < v.x + v.width and my > v.y and my < v.y + h + margin then
+        dropdowns[i].selected = dropdowns[i].selected - math.floor(y)
+        dropdowns[i].selected = (dropdowns[i].selected - 1) % #dropdowns[i].options + 1
+        createDropdowns()
+      end
+    end
+  end
+end
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