fixes + add the remaining eases

dropdown.lua

@@ -66,6 +66,13 @@ function self.createDropdowns()
     name = 'mode'
   })
 
+  local param1 = {}
+  local param2 = {}
+  param1[1] = slider.kvalue('param11')
+  param1[2] = slider.kvalue('param12')
+  param2[1] = slider.kvalue('param21')
+  param2[2] = slider.kvalue('param22')
+
   if d[dropdownId].selected == 1 then -- preview ease
     insertDropdown(d, {
       x = outerpadding + dropdownWidth + padding,
@@ -74,7 +81,12 @@ function self.createDropdowns()
       options = skeys(ease.eases),
       name = 'ease1'
     })
-    ease.ease = ease.eases[d[dropdownId].options[d[dropdownId].selected]].f
+    local _e = ease.eases[d[dropdownId].options[d[dropdownId].selected]]
+    param1[1] = param1[1] or (_e.params[1] and _e.params[1].default) or 1
+    param1[2] = param1[2] or (_e.params[2] and _e.params[2].default) or 1
+    ease.ease = function(x)
+      return _e.f(x, param1[1], param1[2])
+    end
   elseif d[dropdownId].selected == 2 then -- mix eases
     insertDropdown(d, {
       x = outerpadding + dropdownWidth + padding,
@@ -90,7 +102,14 @@ function self.createDropdowns()
       options = skeys(ease.eases),
       name = 'ease2'
     })
-    ease.ease = ease.mixEase(ease.eases[d[dropdownId - 1].options[d[dropdownId - 1].selected]].f, ease.eases[d[dropdownId].options[d[dropdownId].selected]].f, mixpoint)
+
+    local _e1 = ease.eases[d[dropdownId - 1].options[d[dropdownId - 1].selected]]
+    local _e2 = ease.eases[d[dropdownId].options[d[dropdownId].selected]]
+    param1[1] = param1[1] or (_e1.params[1] and _e1.params[1].default) or 1
+    param1[2] = param1[2] or (_e1.params[2] and _e1.params[2].default) or 1
+    param2[1] = param2[1] or (_e2.params[1] and _e2.params[1].default) or 1
+    param2[2] = param2[2] or (_e2.params[2] and _e2.params[2].default) or 1
+    ease.ease = ease.mixEase(_e1.f, _e2.f, slider.kvalue('mix'), param1, param2)
   elseif d[dropdownId].selected == 3 then -- create eases
     insertDropdown(d, {
       x = outerpadding + dropdownWidth + padding,

ease.lua

@@ -2,14 +2,14 @@ local self = {}
 
 local easelib = require 'easelib'
 
-function self.mixEase(e1, e2, point)
+function self.mixEase(e1, e2, point, param1, param2)
   if not point then point = 0.5 end
 
   return function(a)
     if a < point then
-      return e1(a / point) * point
+      return e1(a / point, param1[1], param1[2]) * point
     else
-      return e2((a - point) / (1 - point)) * (1 - point) + point
+      return e2((a - point) / (1 - point), param2[1], param2[2]) * (1 - point) + point
     end
   end
 end
@@ -17,18 +17,26 @@ end
 self.eases = {}
 for i,v in pairs(easelib) do
   local min = 0
-  
+
+  local params = {}
+  for i = 3, #v do
+    if v[i] then
+      table.insert(params, {min = v[i][1], max = v[i][2], default = v[i][3], name = v[i][4]})
+    end
+  end
+
   local q = 10
   for i = 0, q do
-    local s = v[2](i / q)
+    local s = v[2](i / q, (params[1] or {}).default, (params[2] or {}).default)
-    if s < 0 then min = -1 end
+    if s < 0 and not v.overridemin then min = -1 end
   end
 
   self.eases[v[1]] = {
     f = v[2],
     max = 1,
     min = min,
-    i = i
+    i = i,
+    params = params
   }
 end
 

easelib.lua

@@ -32,6 +32,25 @@ table.insert(self, {'pulse', function(t) return t < .5 and self.tap(t * 2) or -s
 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, {'popElastic', function(t, damp, count)
+  return (1000 ^ -(t ^ damp) - 0.001) * sin(count * pi * t)
+end, {1, 10, 1.4, 'damp'}, {1, 25, 6, 'count'}})
+table.insert(self, {'tapElastic', function(t, damp, count)
+  return (1000 ^ -((1 - t) ^ damp) - 0.001) * sin(count * pi * (1 - t))
+end, {1, 10, 1.4, 'damp'}, {1, 25, 6, 'count'}})
+table.insert(self, {'pulseElastic', function(t, damp, count)
+  if t < .5 then
+    return self.tapElastic(t * 2, damp, count)
+  else
+    return -self.popElastic(t * 2 - 1, damp, count)
+  end
+end, {1, 10, 1.4, 'damp'}, {1, 25, 6, 'count'}})
+
+table.insert(self, {'impulse', function(t, damp)
+  t = t ^ damp
+  return t * (1000 ^ -t - 0.001) * 18.6
+end, {0, 10, 0.9, 'damp'}})
+
 table.insert(self, {'inSine', function(x)
   return 1 - cos(x * (pi * 0.5))
 end})
@@ -129,4 +148,28 @@ table.insert(self, {'inOutBounce', function(t)
   end
 end})
 
+table.insert(self, {'inElastic', function(t, a, p)
+  return 1 - self.outElastic(1 - t, a, p)
+end, {1, 3, 1, 'a'}, {0, 2, 0.3, 'p'}, overridemin = true})
+table.insert(self, {'outElastic', function(t, a, p)
+  return a * pow(2, -10 * t) * sin((t - p / (2 * pi) * asin(1/a)) * 2 * pi / p) + 1
+end, {1, 3, 1, 'a'}, {0, 2, 0.3, 'p'}, overridemin = true})
+table.insert(self, {'inOutElastic', function(t, a, p)
+  return t < 0.5
+    and  0.5 * self.inElastic(t * 2, a, p)
+    or  0.5 + 0.5 * self.outElastic(t * 2 - 1, a, p)
+end, {1, 3, 1, 'a'}, {0, 2, 0.3, 'p'}, overridemin = true})
+
+table.insert(self, {'inBack', function(t, a)
+  return t * t * (a * t + t - a)
+end, {0, 3, 1.70158, 'a'}})
+table.insert(self, {'outBack', function(t, a)
+  t = t - 1 return t * t * ((a + 1) * t + a) + 1
+end, {0, 3, 1.70158, 'a'}})
+table.insert(self, {'inOutBack', function(t, a)
+  return t < 0.5
+  and  0.5 * self.inBack(t * 2, a)
+  or  0.5 + 0.5 * self.outBack(t * 2 - 1, a)
+end, {0, 3, 1.70158, 'a'}})
+
 return self

graph.lua

@@ -21,6 +21,9 @@ function self.update(dt)
       b = b / 2 + 0.5
     end
     graph[i] = mix(v, b, math.min(dt * 18, 1))
+    if graph[i] ~= graph[i] then -- is nan
+      graph[i] = b
+    end
   end
   self.touchtimer = mix(self.touchtimer, 0, dt * 2)
 

main.lua

@@ -18,10 +18,10 @@ require 'util' -- exports into global table
 
 -- rendering constants
 
-padding = 14
+padding = 16
 outerpadding = 22
 margin = 6
-dropdownWidth = 106
+dropdownWidth = 128
 fontHeight = love.graphics.getFont():getHeight()
 
 -- global for convinience's sake

slider.lua

@@ -19,7 +19,7 @@ function self.kget(key)
 end
 
 function self.kvalue(key)
-  return self.kget(key).oldvalue
+  return self.kget(key) and self.kget(key).oldvalue
 end
 
 local sliderId
@@ -38,7 +38,7 @@ function self.createSliders()
   if mode == 2 then -- mix eases
     insertSlider(s, {
       x = outerpadding,
-      y = outerpadding + fontHeight + padding,
+      y = outerpadding + fontHeight * 2.5 + padding,
       width = dropdownWidth,
       min = 0,
       max = 1,
@@ -48,12 +48,51 @@ function self.createSliders()
     })
   end
 
+  local ease1 = ease.eases[dropdown.kselected('ease1')]
+  local ease2 = ease.eases[dropdown.kselected('ease2')]
+
+  local param1 = ease1 and ease1.params
+  local param2 = ease2 and ease2.params
+
+  if param1 then
+    for i,v in ipairs(param1) do
+      insertSlider(s, {
+        x = outerpadding + dropdownWidth + padding,
+        y = outerpadding + (fontHeight * 2.5 + padding) * i,
+        width = dropdownWidth,
+        min = v.min,
+        max = v.max,
+        default = v.default,
+        name = 'param1' .. i,
+        displayname = 'Parameter ' .. v.name
+      })
+    end
+  end
+  if param2 then
+    for i,v in ipairs(param2) do
+      insertSlider(s, {
+        x = outerpadding + dropdownWidth + padding + dropdownWidth + padding,
+        y = outerpadding + (fontHeight * 2.5 + padding) * i,
+        width = dropdownWidth,
+        min = v.min,
+        max = v.max,
+        default = v.default,
+        name = 'param2' .. i,
+        displayname = 'Parameter ' .. v.name
+      })
+    end
+  end
+
   sliders = s
 end
 
+local function normalize(a, min, max)
+  return (a - min) / (max - min)
+end
+
 function self.update(dt)
   for i, v in ipairs(sliders) do
-    v.spintimer = mix(v.spintimer + math.abs(v.value - v.oldvalue), 0, math.min(dt * 8))
+    v.spintimer = mix(v.spintimer + math.abs(normalize(v.value, v.min, v.max) - normalize(v.oldvalue, v.min, v.max)), 0, math.min(dt * 8))
     v.oldvalue = mix(v.oldvalue, v.value, math.min(dt * 20, 1))
 
     if v.spintimer > 2 then
@@ -74,13 +113,20 @@ function self.render()
     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 * v.oldvalue, y + h/2
+    local normalvalue = normalize(v.value, v.min, v.max)
+    local normaloldvalue = normalize(v.oldvalue, v.min, v.max)
+    local normaldefault = normalize(v.default, v.min, v.max)
+
+    love.graphics.setColor(0.7, 0.7, 0.7, 0.3)
+    love.graphics.line(x + normaldefault * w, y, x + normaldefault * w, y + h)
+
+    local sx, sy = x + w * normaloldvalue, y + h/2
     local ssize = h * 0.5
 
     love.graphics.push()
 
     love.graphics.translate(sx, sy)
-    love.graphics.rotate((v.value - v.oldvalue) * 4 + v.spin * math.pi * 2)
+    love.graphics.rotate((normalvalue - normaloldvalue) * 4 + v.spin * math.pi * 2)
 
     local hovering = mx > sx - ssize/2 and mx < sx + ssize/2 and my > sy - ssize/2 and my < sy + ssize/2 and dropdown.openDropdown == 0
     local dragging = mx > x and mx < x + w and my > y and my < y + h and love.mouse.isDown(1) and dropdown.openDropdown == 0
@@ -93,18 +139,26 @@ function self.render()
     love.graphics.setColor(1, 1, 1, 1)
     love.graphics.rectangle('line', -ssize/2, -ssize/2, ssize, ssize)
 
-    love.graphics.rotate((v.value - v.oldvalue) * -2)
+    love.graphics.rotate((normalvalue - normaloldvalue) * -2)
 
     love.graphics.setColor(1, 1, 1, 1)
     love.graphics.printf(math.floor(v.value * 100)/100, -ssize * 6, ssize - 2, ssize * 12, 'center')
 
     love.graphics.pop()
 
-    love.graphics.printf(v.displayname, v.x + margin * 2 - ssize * 6, v.y - 5, ssize * 12, 'center')
+    love.graphics.printf(v.displayname, v.x + margin * 2 - ssize * 6, v.y - 8, ssize * 12, 'center')
 
     if dragging then
-      v.value = (mx - x) / w
+      v.value = ((mx - (x + 1)) / (w - 2)) * (v.max - v.min) + v.min
-      graph.touchtimer = 1
+      if v.name == 'mix' then graph.touchtimer = 1 end -- sorry !!!
+      createUI()
+    end
+    if mx > x and mx < x + w and my > y and my < y + h and love.mouse.isDown(2) and dropdown.openDropdown == 0 then
+      v.value = v.default
+      createUI()
+    end
+    if mx > x and mx < x + w and my > y and my < y + h and love.mouse.isDown(3) and dropdown.openDropdown == 0 then
+      v.value = v.min + math.random() * (v.max - v.min)
       createUI()
     end
   end