update

app.py

@@ -2,95 +2,122 @@ import streamlit as st
 import streamlit_pianoroll
 from fortepyan import MidiPiece
 
-piece = MidiPiece.from_file("haydn.mid")
-
-st.write("## Display a PianoRoll player")
-
-code = """
-import streamlit_pianoroll
-from fortepyan import MidiPiece
-
-piece = MidiPiece.from_file("haydn.mid")
-streamlit_pianoroll.from_fortepyan(piece)
-"""
-st.code(code, language="python")
-streamlit_pianoroll.from_fortepyan(piece)
-
-st.write("## Conditional coloring")
-st.write("#### Absolute pitch value condition")
-
-code = """
-df = piece.df
-ids = df.pitch > pitch_threshold
-
-part_a = df[ids]
-part_b = df[~ids]
-piece_a = MidiPiece(df=part_a)
-piece_b = MidiPiece(df=part_b)
-
-streamlit_pianoroll.from_fortepyan(
-    piece=piece_a,
-    secondary_piece=piece_b,
-)
-"""
-st.code(code, language="python")
-
-df = piece.df.copy()
-
-pitch_threshold = st.number_input(
-    label="pitch_threshold",
-    min_value=df.pitch.min(),
-    max_value=df.pitch.max(),
-    value=60,
-)
-ids = df.pitch > pitch_threshold
-
-part_a = df[ids].copy()
-part_b = df[~ids].copy()
-piece_a = MidiPiece(df=part_a)
-piece_b = MidiPiece(df=part_b)
-
-streamlit_pianoroll.from_fortepyan(
-    piece=piece_a,
-    secondary_piece=piece_b,
+st.set_page_config(
+    page_title="PianoRoll Demo",
+    page_icon=":musical_keyboard:",
 )
 
-st.write("#### Note duration condition")
-
-code = """
-df = piece.df
-
-ids = df.duration > duration_threshold
-
-part_a = df[ids]
-part_b = df[~ids]
-piece_a = MidiPiece(df=part_a)
-piece_b = MidiPiece(df=part_b)
-
-streamlit_pianoroll.from_fortepyan(
-    piece=piece_a,
-    secondary_piece=piece_b,
-)
-"""
-st.code(code, language="python")
 
-df = piece.df.copy()
-
-duration_threshold = st.number_input(
-    label="duration threshold",
-    min_value=0.05,
-    max_value=5.,
-    value=0.25,
-)
-
-ids = df.duration > duration_threshold
-
-part_a = df[ids].copy()
-part_b = df[~ids].copy()
-piece_a = MidiPiece(df=part_a)
-piece_b = MidiPiece(df=part_b)
-
-streamlit_pianoroll.from_fortepyan(
-    piece=piece_a,
-    secondary_piece=piece_b,
-)
+def main():
+    piano_music_demo()
+
+
+def piano_music_demo():
+    piece = MidiPiece.from_file("haydn.mid")
+
+    st.write("## Display a PianoRoll player")
+    st.write("""
+    The core functionality of pianorolls includes music playback and visualization.
+    If you have a MIDI file with piano music, see here for instructions on interacting with it using Streamlit components.
+    """)
+
+    code = """
+    import streamlit_pianoroll
+    from fortepyan import MidiPiece
+
+    piece = MidiPiece.from_file("haydn.mid")
+    streamlit_pianoroll.from_fortepyan(piece)
+    """
+    st.code(code, language="python")
+    streamlit_pianoroll.from_fortepyan(piece)
+    st.info(
+        body="This component is dedicated to piano music, there's no way to interract with multiple instruments.",
+        icon="🎹",
+    )
+
+    st.write("## Conditional coloring")
+    st.write("""
+    To create a pianoroll with different notes in separate colors,
+    create two `MidiPiece` objects, each containing the notes for one color.
+    """)
+    st.write("#### Absolute pitch value condition")
+
+    code = """
+    df = piece.df
+    ids = df.pitch > pitch_threshold
+
+    part_a = df[ids]
+    part_b = df[~ids]
+    piece_a = MidiPiece(df=part_a)
+    piece_b = MidiPiece(df=part_b)
+
+    streamlit_pianoroll.from_fortepyan(
+        piece=piece_a,
+        secondary_piece=piece_b,
+    )
+    """
+    st.code(code, language="python")
+
+    df = piece.df.copy()
+
+    pitch_threshold = st.number_input(
+        label="pitch_threshold",
+        min_value=df.pitch.min(),
+        max_value=df.pitch.max(),
+        value=60,
+    )
+    ids = df.pitch > pitch_threshold
+
+    part_a = df[ids].copy()
+    part_b = df[~ids].copy()
+    piece_a = MidiPiece(df=part_a)
+    piece_b = MidiPiece(df=part_b)
+
+    streamlit_pianoroll.from_fortepyan(
+        piece=piece_a,
+        secondary_piece=piece_b,
+    )
+
+    st.write("#### Note duration condition")
+
+    code = """
+    df = piece.df
+
+    ids = df.duration > duration_threshold
+
+    part_a = df[ids]
+    part_b = df[~ids]
+    piece_a = MidiPiece(df=part_a)
+    piece_b = MidiPiece(df=part_b)
+
+    streamlit_pianoroll.from_fortepyan(
+        piece=piece_a,
+        secondary_piece=piece_b,
+    )
+    """
+    st.code(code, language="python")
+
+    df = piece.df.copy()
+
+    duration_threshold = st.number_input(
+        label="duration threshold",
+        min_value=0.05,
+        max_value=5.,
+        value=0.25,
+    )
+
+    ids = df.duration > duration_threshold
+
+    part_a = df[ids].copy()
+    part_b = df[~ids].copy()
+    piece_a = MidiPiece(df=part_a)
+    piece_b = MidiPiece(df=part_b)
+
+    streamlit_pianoroll.from_fortepyan(
+        piece=piece_a,
+        secondary_piece=piece_b,
+    )
+
+
+if __name__ == "__main__":
+    main()