bad apple: Initial version of the demo.

This adds famous movie with music.

apps/bad/ChangeLog

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+0.01: attempt to import

apps/bad/README.md

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+# Bad Apple demo ![](app.png)
+
+"Bad Apple" is like "Hello World" for graphics system. So this is it
+for Bangle.js2. Watch have no speaker, so vibration motor is used,
+instead, to produce (pretty quiet) sound.
+
+Tools for preparing bad.araw and bad.vraw are in prep/ directory. Full
+3 minute demo should actually fit to the watch.

apps/bad/app-icon.js

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+require("heatshrink").decompress(atob("mEwgIifiAFWj//Aod///gAgMH///+AFBn4FB/AQDAoYEB//8gEBAokDAoX+ApguCAAIFqGoYFNLIZHBApZxFAoyDCAoqJCSoqsBUIcPAoKtF4AFBJAS/DHIQAeA="))

apps/bad/bad.app.js

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+/* sox Rear_Right.wav -r 4k -b 8 -c 1 -e unsigned-integer 0.raw vol 2 
+   aplay -r 4000 /tmp/0.raw
+*/
+
+/* https://forum.espruino.com/conversations/348912/ */
+
+let pin = D19;
+
+function play(name, callback) {  
+  function playChar(offs) {
+    var l = 10240;
+    var s = require("Storage").read(name, offs, l);
+    //print("Waveform " + name + " " + s.length);
+    if (!s.length) {
+      digitalWrite(pin,0);
+      if (callback) callback();
+      return;
+    }
+    var w = new Waveform(s.length);
+    var b = w.buffer;
+    b.set(s);
+    //print("Buffer", s.length);
+    //for (var i=s.length-1;i>=0;i--)b[i]/=4;
+    w.startOutput(pin, 4000);
+    w.on("finish", function(buf) {
+      playChar(offs+l);
+    });
+  }
+  analogWrite(pin, 0.1, {freq:40000});
+  playChar(0);
+}
+
+function video(name, callback) {  
+  function frame() {
+    var s = require("Storage").read(name, offs, l);
+    if (!s)
+      return;
+    g.drawImage(s, 0, 0, { scale: 2 });
+    g.flip();
+    offs += l;
+  }
+  g.clear();
+  var offs = 0;
+  //var l = 3875; for 176x176
+  //var l = 515; for 64x64
+  var l = 971;
+  setInterval(frame, 200);
+}
+
+function run() {
+  clearInterval(i);
+  print("Running");
+  play('bad.araw');
+  t1 = getTime();
+  video('bad.vraw');
+  print("100 frames in ", getTime()-t1);
+  // 1.7s, unscaled
+  // 2.68s, scale 1.01
+  // 5.73s, scale 2.00
+  // 9.93s, scale 2, full screen
+  // 14.4s scaled. 176/64
+}
+
+print("Loaded");
+i = setInterval(run, 100);

apps/bad/metadata.json

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+{ "id": "bad",
+  "name": "Bad Apple",
+  "version":"0.01",
+  "description": "Bad Apple demo",
+  "icon": "app.png",
+  "readme": "README.md",
+  "supports" : ["BANGLEJS2"],
+  "allow_emulator": false,
+  "tags": "game",
+  "storage": [
+      {"name":"bad.app.js","url":"bad.app.js"},
+      {"name":"bad.vraw","url":"bad.vraw"},
+      {"name":"bad.araw","url":"bad.araw"},
+      {"name":"bad.img","url":"app-icon.js","evaluate":true}
+  ]
+}

apps/bad/prep/img_convert.py

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+#!/usr/bin/python3
+
+from PIL import Image
+import os
+
+def convert_image(input_path, output_width, output_height):
+    img = Image.open(input_path)
+    img_resized = img.resize((output_width, output_height), Image.ANTIALIAS)
+    img_gray = img_resized.convert('L')
+    img_1bpp = img_gray.point(lambda x: 0 if x < 128 else 255, '1')
+    return img_1bpp
+
+def convert_and_append_header(input_directory, size):
+    input_files = [f for f in os.listdir(input_directory) if f.startswith("image_") and f.endswith(".png")]
+    input_files.sort()
+    header_bytes = size.to_bytes(1, byteorder='big') + size.to_bytes(1, byteorder='big') + b'\x01'
+
+    for i, input_file in enumerate(input_files):
+        input_path = os.path.join(input_directory, input_file)
+        img_1bpp = convert_image(input_path, size, size)
+        output_file = input_path + ".raw"
+
+        with open(output_file, 'wb') as raw_file:
+            raw_file.write(header_bytes)
+            raw_file.write(img_1bpp.tobytes())
+
+if __name__ == "__main__":
+    input_directory = "."  # Replace with the path to your image directory
+    output_width = 88
+    output_file_path = "output_with_header.raw"  # Replace with the desired output file path
+
+    convert_and_append_header(input_directory, output_width)

apps/bad/prep/run

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+#!/bin/bash
+
+# aplay -r 4000 /tmp/0.raw
+#bug: Terminal exists on b.js, it is dumb terminal, not vt100.
+
+rm image_*.png image_*.png.raw output.wav ../bad.araw ../bad.vraw
+
+I=bad.mp4
+S=1:18
+E=1:50
+
+ffmpeg -i $I -ss $S -to $E -vn -acodec pcm_u8 -ar 4000 -ac 1 -y output.wav
+./wav_divider.py
+mv output.raw ../bad.araw
+
+ffmpeg -i $I -ss $S -to $E -r 5 -vf fps=5 image_%04d.png
+./img_convert.py
+cat *.png.raw > ../bad.vraw
+
+ls -al ../bad.*

apps/bad/prep/wav_divider.py

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+#!/usr/bin/python3
+
+def divide_bytes(input_file, output_file):
+    with open(input_file, 'rb') as infile:
+        with open(output_file, 'wb') as outfile:
+            byte = infile.read(1)
+            while byte:
+                # Convert byte to integer, divide by 4, and write back as byte
+                new_byte = bytes([int.from_bytes(byte, byteorder='big') // 3])
+                outfile.write(new_byte)
+                byte = infile.read(1)
+
+divide_bytes("output.wav", "output.raw")