let the user control the graph time

graph.lua

@@ -5,6 +5,8 @@ local graph = {}
 
 self.touchtimer = 0
 
+local timer = 0
+
 function self.update(dt)
   for i = 1, quality do
     local a = (i - 1) / (quality - 1)
@@ -21,6 +23,21 @@ function self.update(dt)
     graph[i] = mix(v, b, math.min(dt * 18, 1))
   end
   self.touchtimer = mix(self.touchtimer, 0, dt * 2)
+
+  -- lots of math just for the timer
+  -- may need to abstract this out, somehow
+  -- todo
+  local sw, sh = love.graphics.getDimensions()
+  local csize = 10 -- preview point size
+  local size = math.min((sw - outerpadding) - ((dropdown.kget('ease2') or dropdown.kget('ease1')).x + dropdownWidth + padding), sh - outerpadding * 2 - padding * 3 - csize)
+  local x, y, w, h = sw - outerpadding - size, outerpadding, size, size
+  local mx, my = love.mouse.getPosition()
+
+  if not (love.mouse.isDown(1) and mx > x and mx < x + w and my > y and my < y + h) then
+    timer = (timer + dt) % 2
+  else
+    timer = mix(timer, (mx - x) / w, dt * 14)
+  end
 end
 
 function self.render()
@@ -51,7 +68,7 @@ function self.render()
     end
 
     -- preview point
-    local t = love.timer.getTime() % 1
+    local t = timer % 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)
 
@@ -84,7 +101,7 @@ function self.render()
     local a1 = ease.ease(t)
     local a2 = ease.ease(math.max(math.min(t - 0.1, 1), 0))
     local da = a1
-    if love.timer.getTime() % 2 < 1 and math.floor(ease.ease(0) + 0.5) ~= math.floor(ease.ease(1) + 0.5) then
+    if timer % 2 > 1 and math.floor(ease.ease(0) + 0.5) ~= math.floor(ease.ease(1) + 0.5) then
       da = 1 - da
     end
     if minEase then