Add Piano Visualizer article (Day 101)

Author: global_name

_posts/2026-04-16-piano-visualizer.md

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+---
+layout: post
+title: "Day 101: Piano Visualizer / 钢琴可视化工具"
+author: "iOSDevLog"
+date: 2026-04-16 20:00:00 +0800
+category: ["AI", "Open Source"]
+tags: ["piano", "visualizer", "synthesia", "midi", "pdf", "music"]
+---
+
+# Piano Visualizer / 钢琴可视化工具
+
+A Synthesia-like piano keyboard visualization software with MIDI playback, audio synthesis, PDF sheet music display, and manual keyboard input.
+
+一个类似 Synthesia 的钢琴键盘可视化软件，支持 MIDI 播放、音频合成、PDF 乐谱显示和手动键盘输入。
+
+## Screenshots
+
+![AI_Piano](/assets/images/ai-piano/AI_Piano.png)
+
+![AI_Piano_Fullscreen](/assets/images/ai-piano/AI_Piano_Fullscreen.png)
+
+## Features / 功能特性
+
+- 88-key piano keyboard visualization / 88键钢琴键盘可视化
+- MIDI file playback with real-time note highlighting / MIDI 文件播放与实时音符高亮
+- Falling notes visualization (like Synthesia) / 下落音符可视化（类似 Synthesia）
+- Audio synthesis with polyphonic sound output / 多音复音音频合成
+- PDF sheet music viewer / PDF 乐谱查看器
+- Manual keyboard input - play piano with your computer keyboard / 手动键盘输入 - 用电脑键盘弹钢琴
+- Keyboard labels showing which computer keys map to piano keys / 键盘标签显示电脑按键与钢琴键的映射
+- Fullscreen support / 全屏支持
+- Resizable window / 可调整窗口大小
+- Drag and drop MIDI/PDF files / 拖放 MIDI/PDF 文件
+- Help overlay (F1) / 帮助覆盖层（F1）
+- Synchronized playback / 同步播放
+
+## Dependencies / 依赖项
+
+```bash
+# Install dependencies (Ubuntu/Debian) / 安装依赖（Ubuntu/Debian）
+sudo apt-get install libsdl2-dev libsdl2-image-dev libsdl2-ttf-dev librtmidi-dev poppler-utils
+```
+
+## Building / 编译
+
+```bash
+mkdir build && cd build
+cmake ..
+make
+```
+
+## Usage / 使用方法
+
+```bash
+# Play MIDI with falling notes visualization / 播放 MIDI 并显示下落音符
+./piano_visualizer song.mid
+
+# Play MIDI with PDF sheet music / 播放 MIDI 并显示 PDF 乐谱
+./piano_visualizer song.mid sheet.pdf
+
+# View PDF only and play manually with keyboard / 仅查看 PDF 并用键盘手动演奏
+./piano_visualizer sheet.pdf
+```
+
+## Controls / 控制键
+
+### MIDI Playback (when MIDI file is loaded) / MIDI 播放（加载 MIDI 文件时）
+- **Space / 空格键**: Play/Pause MIDI / 播放/暂停 MIDI
+- **Backspace / 退格键**: Stop MIDI / 停止 MIDI
+
+### Manual Piano Playing / 手动钢琴演奏
+You can play the piano manually using your computer keyboard:
+
+您可以使用电脑键盘手动演奏钢琴：
+
+**Lower octave (C3-C4) / 低八度（C3-C4）:**
+- White keys / 白键: `Z X C V B N M`
+- Black keys / 黑键: `S D G H J`
+
+**Middle octave (C4-C5) / 中八度（C4-C5）:**
+- White keys / 白键: `Q W E R T Y U I`
+- Black keys / 黑键: `2 3 5 6 7`
+
+## Source Code / 源代码
+
+- GitHub: [https://github.com/iOSDevLog/AI_Piano](https://github.com/iOSDevLog/AI_Piano)
+
+---