add a swap button for eases

src/button.lua

@@ -1,5 +1,11 @@
 local self = {}
 
+local icon = {
+  clipboard = love.graphics.newImage('assets/textures/clipboard.png'),
+  screenshot = love.graphics.newImage('assets/textures/screenshot.png'),
+  swap = love.graphics.newImage('assets/textures/swap.png'),
+}
+
 local buttons = {}
 
 function self.get(index)
@@ -40,6 +46,7 @@ function self.createButtons()
       name = 'clipboard',
       displayname = 'Copy to Clipboard',
       tooltip = 'Copy to Clipboard',
+      icon = 'clipboard',
       func = function()
         local s = ''
 
@@ -122,6 +129,7 @@ function self.createButtons()
       name = 'screenshot',
       displayname = 'Screenshot',
       tooltip = 'Take a screenshot',
+      icon = 'screenshot',
       func = function()
         screenshot = true
         screenshotCanvas = love.graphics.newCanvas()
@@ -129,6 +137,21 @@ function self.createButtons()
     })
   end
 
+  if mode == modes.mix or mode == modes.multiply then
+    insertButton(s, {
+      x = outerpadding + dropdownWidth * 2 + padding,
+      y = outerpadding + fontHeight/2 - padding/2,
+      size = padding,
+      name = 'swap',
+      displayname = 'Swap',
+      icon = 'swap',
+      func = function()
+        dropdown.swap('ease1', 'ease2')
+        createUI()
+      end
+    })
+  end
+
   buttons = s
 end
 
@@ -171,6 +194,11 @@ function self.render()
     love.graphics.rectangle('fill', x, y, w, h)
     love.graphics.setColor(1, 1, 1, 1)
     love.graphics.rectangle('line', x, y, w, h)
+
+    if v.icon and icon[v.icon] then
+      local icon = icon[v.icon]
+      love.graphics.draw(icon, x, y, 0, w / icon:getWidth(), h / icon:getHeight())
+    end
   end
 end
 

src/dropdown.lua

@@ -71,6 +71,13 @@ function self.kselected(key)
   end
 end
 
+function self.swap(key, key2)
+  local a, b = self.kget(key), self.kget(key2)
+  local s = a.selected
+  a.selected = b.selected
+  b.selected = s
+end
+
 local dropdownId
 local function insertDropdown(tab, f)
   dropdownId = dropdownId + 1