From 91371d9c906e2864c6917b472627fc00c04cd880 Mon Sep 17 00:00:00 2001
From: gretchen <gretchen@gnar.cool>
Date: Mon, 18 Nov 2019 19:07:08 -0800
Subject: Ok, last silly thing: random scale

---
 example/example.lua | 34 ++++++++++++++++++++++++++--------
 1 file changed, 26 insertions(+), 8 deletions(-)

diff --git a/example/example.lua b/example/example.lua
index 73841c6..45056c3 100644
--- a/example/example.lua
+++ b/example/example.lua
@@ -3,26 +3,44 @@
 local MusicUtil = require "musicutil"
 engine.name = "PolyPerc"
 
+scale = nil
+
 function redraw()
   screen.clear()
   screen.move(64, 32)
-  screen.text_center("norns example #" .. math.floor(math.random() * 1000))
+  screen.text_center(scale.name)
   screen.update()
 end
 
 
 function init()
+  -- random scale output, just to emphasize the point
+  local base = 60
+  scale = MusicUtil.SCALES[math.random(1, #MusicUtil.SCALES)]
   redraw()
-  -- random note output, just to emphasize the point
-  local note = math.random(60, 90)
-  engine.hz(MusicUtil.note_num_to_freq(note))
+
+  local notes = {}
+  for _, interval in pairs(scale.intervals) do
+    table.insert(notes, base + interval)
+  end
+
   local m = midi.connect(2)
   local c = metro.init()
-  c.time = 0.5
+  c.time = 0.2
+  local on = false
   c.event = function ()
-    c:stop()
-    metro.free(c.id)
-    m:note_off(note, 10)
+    if #notes == 0 then
+      c:stop()
+    elseif not on then
+      on = true
+      local here = notes[1]
+      engine.hz(MusicUtil.note_num_to_freq(here))
+      m:note_on(here, 20)
+    else
+      on = false
+      local here = table.remove(notes, 1)
+      m:note_off(here, 20)
+    end
   end
   m:note_on(note, 20)
   c:start()
-- 
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