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PianoVisualizer.pde

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+import themidibus.*; //Import the midibus library
+MidiBus myBus; // The MidiBus
+
+boolean nowPedaling = false; // is it pedaling?（不要動）
+int[] isKeyOn = new int[128]; // what notes are being pressed (1 or 0)（不要動）
+float[] isFilled = new float[128]; // not used (yet)（不要動）
+int[] isPedaled = new int[128]; // what notes are pedaled (1 or 0)（不要動）
+color keyOnColor; // set it in setup()
+color pedaledColor; // set it in setup()
+
+int[] isBlack = {0, 11, 0, 13, 0, 0, 11, 0, 12, 0, 13, 0}; // 是黑鍵嗎？是的話，相對左方的白鍵位移多少？(default: {0, 11, 0, 13, 0, 0, 11, 0, 12, 0, 13, 0}）
+int border = 3; // 左方留空幾個畫素？(default: 3)
+int whiteKeyWidth = 20; // 白鍵多寬？(default: 20)
+int whiteKeySpace = 1; // 白鍵間的縫隙多寬？(default: 1)
+int blackKeyWidth = 17; // 黑鍵多寬？(default: 17)
+int blackKeyHeight = 45; // 黑鍵多高？(default: 45)
+int radius = 5; // 白鍵圓角(default: 5)
+int bRadius = 4; // 黑鍵圓角(default: 4)
+int keyAreaY = 3; // 白鍵從 Y 軸座標多少開始？(default: 3)
+int keyAreaHeight = 70; // 白鍵多高？(default: 70)
+boolean rainbowMode = false; // 彩虹模式 (default: false)
+
+void setup() {
+  int winWidth = (whiteKeyWidth+whiteKeySpace)*52 + (border*2); // recommended window width
+  int winHeight = keyAreaHeight + (keyAreaY*2); // recommended window width
+  println("Recommended window size: ", winWidth, winHeight); // 建議的視窗大小（顯示於 Console）
+  size(1098, 76, FX2D); // 視窗大小 (default: 1098, 76)
+  colorMode(HSB, 360, 100, 100, 100);
+  keyOnColor = color(326, 100, 100, 100); // <---- 編輯這裡換「按下時」的顏色！[HSB Color Mode] 
+  pedaledColor = color(326, 70, 60, 100); // <---- 編輯這裡換「踏板踩住」的顏色！[HSB Color Mode]
+  smooth(2);
+  frameRate(60);
+  initKeys();
+  MidiBus.list(); // 啟動時會列出 MIDI 輸入/輸出 設備，記下你想用的 MIDI 輸入編號，設定在下一行。
+  myBus = new MidiBus(this, 4, -1); // 編輯「this 後面那個數字」選擇 MIDI 輸入設備。
+}
+
+void draw() {
+  background(0, 0, 30, 100);
+  drawWhiteKeys();
+  drawBlackKeys();
+}
+
+void initKeys() {
+  for (int i = 0; i<128; i++) {
+    isKeyOn[i] = 0;
+    isFilled[i] = 0.0;
+    isPedaled[i] = 0;
+  }
+}
+
+void drawWhiteKeys() {
+  int wIndex = 0; // white key index
+  stroke(0, 0, 0);
+  strokeWeight(1);
+  for (int i = 21; i < 109; i++) {
+    if (isBlack[i % 12] == 0) {
+      // it's a white key
+      if (isKeyOn[i] == 1 && !rainbowMode) {
+        fill(keyOnColor); // keypressed
+      } else if (isKeyOn[i] == 1 && rainbowMode) {
+        fill(map(i, 21, 108, 0, 1080)%360, 100, 100, 100); // rainbowMode
+      } else if (isPedaled[i] == 1 && !rainbowMode) {
+        fill(pedaledColor); // pedaled
+      } else if (isPedaled[i] == 1 && rainbowMode) {
+        fill(map(i, 21, 108, 0, 1080)%360, 100, 70, 100); // pedaled rainbowMode
+      } else {
+        fill(0, 0, 100); // white key
+      }
+      int thisX = border + wIndex*(whiteKeyWidth+whiteKeySpace);
+      rect(thisX, keyAreaY, whiteKeyWidth, keyAreaHeight, radius);
+      // println(wIndex);
+      wIndex++;
+    }
+  }
+}
+
+void drawBlackKeys() {
+  int wIndex = 0; // white key index
+  stroke(0, 0, 0);
+
+  strokeWeight(1.5);
+
+  for (int i = 21; i < 109; i++) {
+    if (isBlack[i % 12] == 0) {
+      // it's a white key
+      wIndex++;
+    }
+
+    if (isBlack[i % 12] > 0) {
+      // it's a black key
+      if (isKeyOn[i] == 1 && !rainbowMode) {
+        fill(keyOnColor); // keypressed
+      } else if (isKeyOn[i] == 1 && rainbowMode) {
+        fill(map(i, 21, 108, 0, 1080)%360, 100, 100, 100); // rainbowMode
+      } else if (isPedaled[i] == 1 && !rainbowMode) {
+        fill(pedaledColor); // pedaled
+      } else if (isPedaled[i] == 1 && rainbowMode) {
+        fill(map(i, 21, 108, 0, 1080)%360, 100, 70, 100); // pedaled rainbowMode
+      } else {
+        fill(0, 0, 0); // white key
+      }
+
+
+      int thisX = border + (wIndex-1)*(whiteKeyWidth+whiteKeySpace) + isBlack[i % 12];
+      rect(thisX, keyAreaY-1, blackKeyWidth, blackKeyHeight, bRadius);
+    }
+  }
+}
+
+void noteOn(int channel, int pitch, int velocity) {
+  // Receive a noteOn
+  isKeyOn[pitch] = 1;
+  isFilled[pitch] = 100;
+  if (nowPedaling) {
+    isPedaled[pitch] = 1;
+  }
+}
+
+void noteOff(int channel, int pitch, int velocity) {
+  // Receive a noteOff
+  isKeyOn[pitch] = 0;
+  isFilled[pitch] = 0;
+}
+
+void controllerChange(int channel, int number, int value) {
+  // Receive a controllerChange
+  if (number == 64 && value >= 64) {
+    nowPedaling = true;
+    for (int i = 0; i<128; i++) {
+      // copy key on to pedal
+      isPedaled[i] = isKeyOn[i];
+    }
+  }
+
+  if (number == 64 && value < 64) {
+    nowPedaling = false;
+    for (int i = 0; i<128; i++) {
+      // reset isPedaledlin
+      isPedaled[i] = 0;
+    }
+  }
+}