JFugue 23. Drum Pattern over 4 measures

Instead of using Strings or the more efficient StringBuilder, we can use simple Patterns to create more complicated Patterns. Patterns use StringBuilder behind the scene.

We added 4 measures of bass, snare, and hihat patterns. They were put in separate layers to sound in harmony and finally added to MIDI channel 10 (or voice 9) - the Percussion channel.

The different Strings inside [ ] for dictionary lookup, can be found in the reference mentioned earlier. It is possible to use the numbers instead since MIDI format standards can be found on different MIDI sites.

---

package jfugue23;

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextArea;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.scene.text.Font;
import javafx.stage.Stage;
import org.jfugue.pattern.Pattern;
import org.jfugue.player.Player;

public class JFugue23 extends Application {
    
    public static void main(String[] args) {
        launch(args);
    }
    
    TextArea text;
    Button button;
    
    @Override
    public void start(Stage primaryStage) throws Exception {
        
        button = new Button("Play Drum\nPattern");
                
        button.setOnAction(e->example());
        button.setFont(Font.font("Verdana", 16));
        button.setPrefSize(200, 100);
        
        VBox examples = new VBox(10, button);
        examples.setPadding(new Insets(10));
        
        text = new TextArea();
        text.setPrefRowCount(20);
        text.setPrefColumnCount(32);
        text.setFont(Font.font("Verdana", 20));
        text.setEditable(false);
        text.setWrapText(true);
        
        HBox root = new HBox(50,examples,text);
        
        Scene scene = new Scene(root, 900, 600);
        primaryStage.setTitle("JFugue 23. Drum Pattern over 4 measures");
        
        primaryStage.setScene(scene);
        primaryStage.show();
    }
    
    private void example() {
        
        Player player = new Player();
        
        text.appendText("Played Drum Pattern\n");
        
        // 2 measures of bass, snare, hihat
        
        Pattern bassDrum = new Pattern("[BASS_DRUM]q Rq");
        bassDrum.repeat(4);
        bassDrum.prepend("L0");
        
        Pattern snareDrum = new Pattern("Rq [ACOUSTIC_SNARE]q");
        snareDrum.repeat(4);
        snareDrum.prepend("L1");
        
        Pattern hihatDrum = new Pattern("[CLOSED_HI_HAT]i");
        hihatDrum.repeat(15);
        hihatDrum.add("[OPEN_HI_HAT]i");
        hihatDrum.prepend("L2");
        

        Pattern pattern = new Pattern(bassDrum, snareDrum, hihatDrum);
        pattern.repeat(2); // 4 measures in total
        pattern.setVoice(9); // Percussion channel
        pattern.setTempo(125);
        text.appendText("Pattern:\n" + pattern + "\n\n");
        player.play(pattern);
    }
}

---

This is the output after playing once:

---