MIDI code - by ChatGPT

import tkinter as tk from tkinter import ttk from mido import MidiFile, Message, MidiTrack

# --- 全局变量 ---
midi_file = MidiFile()
track = MidiTrack()
midi_file.tracks.append(track)
current_instrument = 0  # 默认乐器

# --- 函数 ---
def add_note():
    pitch = pitch_slider.get()
    duration = duration_slider.get()
    velocity = velocity_slider.get()  # 获取力度值
    track.append(Message('program_change', program=current_instrument, time=0))  # 设置乐器
    track.append(Message('note_on', note=pitch, velocity=velocity, time=0))
    track.append(Message('note_off', note=pitch, velocity=velocity, time=duration))

def change_instrument(event):
    global current_instrument
    current_instrument = instrument_var.get()

def save_midi():
    file_path = tk.filedialog.asksaveasfilename(defaultextension=".mid")
    if file_path:
        midi_file.save(file_path)

# --- GUI设置 ---
root = tk.Tk()
root.title("MIDI编曲器")

# 音高
pitch_label = ttk.Label(root, text="音高:")
pitch_label.grid(row=0, column=0)
pitch_slider = ttk.Scale(root, from_=0, to=127, orient="horizontal")
pitch_slider.grid(row=0, column=1)

# 时值
duration_label = ttk.Label(root, text="时值:")
duration_label.grid(row=1, column=0)
duration_slider = ttk.Scale(root, from_=1, to=127, orient="horizontal")  # 时值至少为1
duration_slider.grid(row=1, column=1)

# 力度
velocity_label = ttk.Label(root, text="力度:")
velocity_label.grid(row=2, column=0)
velocity_slider = ttk.Scale(root, from_=0, to=127, orient="horizontal")
velocity_slider.grid(row=2, column=1)

# 乐器选择
instrument_label = ttk.Label(root, text="乐器:")
instrument_label.grid(row=3, column=0)
instrument_options = [i for i in range(128)]  # 128种MIDI乐器
instrument_var = tk.IntVar(value=current_instrument)
instrument_dropdown = ttk.OptionMenu(root, instrument_var, *instrument_options, command=change_instrument)
instrument_dropdown.grid(row=3, column=1)

# 添加音符按钮
add_button = ttk.Button(root, text="添加音符", command=add_note)
add_button.grid(row=4, column=0, columnspan=2)

# 保存按钮
save_button = ttk.Button(root, text="保存MIDI", command=save_midi)
save_button.grid(row=5, column=0, columnspan=2)

root.mainloop()