diff --git a/circleOfFifths.js b/circleOfFifths.js
new file mode 100644
index 0000000..ea6f08a
--- /dev/null
+++ b/circleOfFifths.js
@@ -0,0 +1,261 @@
+let outRatio = 0.8;
+let outC1;
+let outC2;
+let outCH;
+let outCT;
+let outCSP; // 分隔
+let outText = ["沒有升降", "1 個 #", "2 個 #", "3 個 #", "4 個 #", "5 個 # / 7 個 b", "6 個 # / 6 個 b", "7 個 # / 5 個 b", "4 個 b", "3 個 b", "2 個 b", "1 個 b"]
+let outTextSize = 15;
+
+let majorRatio = 0.74;
+let majorC1;
+let majorC2;
+let majorCT;
+let majorText = ["C", "G", "D", "A", "E", "B/Cb", "F#/Gb", "C#/Db", "Ab", "Eb", "Bb", "F"]
+let majorTextSize = 22;
+
+let minorRatio = 0.65;
+let minorC1;
+let minorC2;
+let minorCT;
+let minorText = ["Am", "Em", "Bm", "F#m", "C#m", "G#m/Abm", "D#m/Ebm", "A#m/Bbm", "Fm", "Cm", "Gm", "Dm"]
+let minorTextSize = 17;
+
+let detailText1 = [
+  "C 大調 / A 小調",
+  "G 大調 / E 小調",
+  "D 大調 / B 小調",
+  "A 大調 / F# 小調",
+  "E 大調 / C# 小調",
+  "B 或 Cb 大調 / G# 或 Ab 小調",
+  "F# 或 Gb 大調 / D# 或 Eb 小調",
+  "C# 或 Db 大調 / A# 或 Bb 小調",
+  "Ab 大調 / F 小調",
+  "Eb 大調 / C 小調",
+  "Bb 大調 / G 小調",
+  "F 大調 / D 小調"
+]
+
+let coreRatio = 0.57;
+let coreType = "Detail";
+
+let dbText = "This is the default debug text."
+
+let mouseDir;
+
+let acc = 0;
+let vel = 0;
+let angle = -3.5; // 1 = 1/12 TAU, global angle
+
+let locked = true;
+
+function setup() {
+  createCanvas(800, 800);
+  ellipseMode(CENTER);
+  colorMode(HSB, 100);
+  //colors
+  outC1 = color(60, 30, 70);
+  outC2 = color(60, 30, 80);
+  outCH = color(60, 30, 100);
+  outCT = color(60, 0, 95);
+  outCSP = color(60, 20, 95);
+  majorC1 = color(80, 30, 80);
+  majorC2 = color(80, 30, 70);
+  majorCT = color(80, 30, 20);
+  minorC1 = color(80, 30, 75);
+  minorC2 = color(80, 30, 65);
+  minorCT = color(80, 10, 90);
+
+  lockButton = createButton('[Locked]');
+  lockButton.position(19, 19);
+  lockButton.mousePressed(toggleLocked);
+
+}
+
+function toggleLocked() {
+  if (locked) {
+    lockButton.html("Lock");
+    locked = false;
+  } else {
+    lockButton.html("[Locked]");
+    locked = true;
+  }
+
+}
+
+function highlighted() {
+  let x = mouseDir - angle;
+  while (x < 0) {
+    x += 12;
+  }
+  x = ((x * 10000) % 120000) / 10000;
+
+  return floor(x);
+}
+
+function drawOuter(ang) {
+  stroke(outCSP);
+  for (i = 0; i < 12; i++) {
+    fill((i % 2 == 0) ? outC1 : outC2);
+
+    if (i == highlighted()) {
+      fill(outCH);
+
+    }
+    let j = i + ang;
+    arc(0, 0, width * outRatio, height * outRatio, TAU * (j / 12), TAU * ((j + 1) / 12) - 0.000001, PIE);
+  }
+  stroke(20);
+  noFill();
+  ellipse(0, 0, width * outRatio);
+}
+
+function drawOuterText(ang) {
+  for (i = 0; i < 12; i++) {
+    let j = i + ang + 3.5; // 把第一個字畫到右方
+    push();
+    rotate(TAU * (j / 12));
+    textAlign(CENTER);
+    textSize(outTextSize);
+    noStroke();
+    fill(outCT);
+    text(outText[i], 0, -(height * outRatio / 2 * 0.945));
+    pop();
+  }
+
+}
+
+function drawMajor(ang) {
+  stroke(90);
+  for (i = 0; i < 12; i++) {
+    fill((i % 2 == 0) ? majorC1 : majorC2);
+    let j = i + ang;
+    arc(0, 0, width * majorRatio, height * majorRatio, TAU * (j / 12), TAU * ((j + 1) / 12) - 0.000001);
+  }
+}
+
+function drawMajorText(ang) {
+  for (i = 0; i < 12; i++) {
+    let j = i + ang + 3.5;
+    push();
+    rotate(TAU * (j / 12));
+    textAlign(CENTER);
+    textSize(majorTextSize);
+    noStroke();
+    fill(majorCT);
+    text(majorText[i], 0, -(height * majorRatio / 2 * 0.91));
+    pop();
+  }
+
+}
+
+function drawMinor(ang) {
+  noStroke();
+  for (i = 0; i < 12; i++) {
+    fill((i % 2 == 0) ? minorC1 : minorC2);
+    let j = i + ang;
+    arc(0, 0, width * minorRatio, height * minorRatio, TAU * (j / 12), TAU * ((j + 1) / 12) - 0.000001);
+  }
+}
+
+function drawMinorText(ang) {
+  for (i = 0; i < 12; i++) {
+    let j = i + ang + 3.5;
+    push();
+    rotate(TAU * (j / 12));
+    textAlign(CENTER);
+    textSize(minorTextSize);
+    noStroke();
+    fill(minorCT);
+    text(minorText[i], 0, -(height * minorRatio / 2 * 0.91));
+    pop();
+  }
+}
+
+function drawCore(ang) {
+  switch (coreType) {
+    case "Empty":
+      drawCoreEmpty(ang);
+      break;
+    case "Black":
+      drawCoreBlack(ang);
+      break;
+    case "Detail":
+      drawCoreDetail(ang);
+      break;
+    default:
+      drawCoreEmpty(ang);
+  }
+}
+
+function drawCoreDetail(ang) {
+  fill(100);
+  stroke(40);
+  ellipse(0, 0, width * coreRatio);
+  fill(20);
+  noStroke();
+  textAlign(CENTER);
+  textSize(22);
+  text(detailText1[highlighted()], 0, height * 0.1);
+}
+
+
+function drawCoreEmpty(ang) {
+  fill(100);
+  stroke(40);
+  ellipse(0, 0, width * coreRatio);
+}
+
+function drawCoreBlack(ang) {
+  fill(0);
+  stroke(40);
+  ellipse(0, 0, width * coreRatio);
+}
+
+function debugText() {
+  fill(0);
+  textAlign(CENTER);
+  text(dbText, 0, height * 0.45);
+}
+
+function mouseAngle(ang) {
+  let v = createVector(mouseX - width / 2, mouseY - height / 2);
+  let h = v.heading(); // -PI ~ PI
+  let i = map(h, -PI, PI, 6, 18);
+  // let j = (i - ang);
+  mouseDir = (i > 12) ? i - 12 : i;
+  // dbText = `${h}, ${i}, ${mouseDir}`;
+
+}
+
+function rotateGlobal() {
+  acc = (mouseX - width / 2) / width;
+  dbText = acc;
+  if (abs(acc) > 0.4) {
+    vel += acc / 70;
+    vel = constrain(vel, -0.1, 0.1);
+  }
+
+  if (locked) {
+    vel = 0; // friction
+  } else {
+    vel *= 0.9
+  }
+  angle += vel;
+}
+
+function draw() {
+  background(95);
+  translate(width / 2, height / 2);
+  mouseAngle(angle);
+  rotateGlobal()
+  highlighted();
+  drawOuter(angle);
+  drawOuterText(angle);
+  drawMajor(angle);
+  drawMajorText(angle);
+  drawMinor(angle);
+  drawMinorText(angle);
+  drawCore(angle);
+  // debugText();
+}