paintComponent의 EventListener

Question

나는 하나의 이벤트마다 사각형을 만들고 화면을 다시 칠하는 음악 응용 프로그램을 만들고 있습니다. 이벤트는 사운드입니다. sound.midi API로 사운드를 생성했습니다. 그러나, 내가 응용 프로그램을 실행하면 사각형이 창에 나타나지 않습니다! 누군가 내가 뭘 잘못하고 있다고 말할 수 있습니까? DrawPanel 클래스

import javax.sound.midi.*; 
import java.io.*; 
import javax.swing.*; 
import java.awt.*; 

public class BeatBoxProject { 

static JFrame f = new JFrame ("My first mucic video"); 
static DrawPanel m1; 

public static void main(String[] args) { 
BeatBoxProject mini = new BeatBoxProject(); 
mini.go(); 
} 

public void setUpGui(){ 
m1 = new DrawPanel(); 
f.setContentPane(m1); 
f.setBounds(30, 30, 300, 300); 
f.setVisible(true); 
} 

public void go(){ 
setUpGui(); 

try{ Sequencer player = MidiSystem.getSequencer(); 
player.open(); // we need the open the sequencer 

player.addControllerEventListener(m1, new int [] {127}); 

Sequence seq = new Sequence(Sequence.PPQ, 4); 
Track track = seq.createTrack(); 

int r = 0;       
for (int i = 0; i < 60; i+=4) { 

r = (int) ((Math.random()*50)+ 1); 
track.add(makeEvent(144,1,r,100,i)); 
track.add(makeEvent(176,1,127,0,i)); 
track.add(makeEvent(128,1,r,100,i+2)); 

} 
player.setSequence(seq); // lets put the disk into the player 
player.setTempoInBPM(120); // lets set the beat(beat per minutes) 
player.start(); 


}catch (Exception ex){ 

     ex.printStackTrace(); 
} 
} 



public static MidiEvent makeEvent (int comd, int chan, int one, int two, int tick){ 


MidiEvent event = null; 

try{ 
ShortMessage a = new ShortMessage(); 
a.setMessage(comd, chan, two, two); 
event = new MidiEvent(a,tick); 
}catch(Exception e) {} 
return event; 
} 
} 

그리고 여기에 있습니다 : : 여기

내 주요 클래스입니다

import javax.sound.midi.ControllerEventListener; 
import java.awt.*; 
import javax.sound.midi.ShortMessage; 
import javax.swing.*; 

public class DrawPanel extends JPanel implements ControllerEventListener { 

boolean msg = false; // its false unles we gonna have an event 

public void controlChange(ShortMessage event) { 
    msg = true; 
    repaint(); 
} 


public void paintComponent (Graphics g){ 
if (msg){ // wee need the msg because other thing can repaint the panel but we only want when event occurs 

Graphics2D g2 = (Graphics2D) g;  

int r = (int) (Math.random()* 250); 
int gr = (int) (Math.random()* 250); 
int b = (int) (Math.random()* 250); 


g.setColor(new Color(r,gr,b)); 

int ht = (int) ((Math.random()*120) +10); 
int width = (int) ((Math.random()*120) +10); 

int x = (int) ((Math.random()*40) +10); 
int y = (int) ((Math.random()*40) +10); 

g.fillRect(x, y, width, HEIGHT); 
msg=false; 

} 
} 
} 

Answer 1

변경

player.addControllerEventListener(m1, new int [] {127}); 

에

player.addControllerEventListener(m1, new int [] {0});