Comment mettre à jour un Canvas sans passer de Graphics

Bonjour,

j'ai un petit problème

Je suis en train de réaliser une petite appli en Java (je ne suis pas du
tout développeur de formation)

http://s.cls.free.fr/wikini/wakka.php?wiki=ProjetHarmon

(Deuxième version)


et j'ai un petit problème

j'ai un Canvas qui ne se met pas à jour lorsque je déplace les sliders.

En fait je ne sais pas trop quoi mettre dans le stateChanged de mes sliders.

Je voudrais bien lancer Draw()

mais il faut passer le paramètre g (Graphic)... or je ne l'ai pas dans
cette méthode.

C'est probablement très basique... mais je ne sais VRAIMENT pas comment
faire.

Merci de m'aider un petit peu




//import java.applet.*;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;


public class CMain_applet extends JApplet implements ActionListener,
ChangeListener {
CSignal sgn;

int mode = 0; // 0=s(t) 1, etc...

Display display = new Display();

JButton butST = new JButton("s(t)");
JButton butAF = new JButton("a(f)");
JButton butPHIF = new JButton("phi(f)");
JButton butAFPHIF = new JButton("a(f) - phi(f)");
JButton butSOUND = new JButton("Son");

JSlider slF1 = new JSlider(JSlider.VERTICAL, 0, 20000, 5000);

JSlider slA0 = new JSlider(JSlider.VERTICAL, -100, 100, 0);
JSlider slA1 = new JSlider(JSlider.VERTICAL, 0, 100, 100);

JSlider slA2 = new JSlider(JSlider.VERTICAL, 0, 100, 0);
JSlider slPHI2 = new JSlider(JSlider.VERTICAL, -180, 180, 0);

JSlider slA3 = new JSlider(JSlider.VERTICAL, 0, 100, 0);
JSlider slPHI3 = new JSlider(JSlider.VERTICAL, -180, 180, 0);

JSlider slA4 = new JSlider(JSlider.VERTICAL, 0, 100, 0);
JSlider slPHI4 = new JSlider(JSlider.VERTICAL, -180, 180, 0);

JSlider slA5 = new JSlider(JSlider.VERTICAL, 0, 100, 0);
JSlider slPHI5 = new JSlider(JSlider.VERTICAL, -180, 180, 0);

JSlider slA6 = new JSlider(JSlider.VERTICAL, 0, 100, 0);
JSlider slPHI6 = new JSlider(JSlider.VERTICAL, -180, 180, 0);

JSlider slA7 = new JSlider(JSlider.VERTICAL, 0, 100, 0);
JSlider slPHI7 = new JSlider(JSlider.VERTICAL, -180, 180, 0);

JSlider slA8 = new JSlider(JSlider.VERTICAL, 0, 100, 0);
JSlider slPHI8 = new JSlider(JSlider.VERTICAL, -180, 180, 0);

JSlider slA9 = new JSlider(JSlider.VERTICAL, 0, 100, 0);
JSlider slPHI9 = new JSlider(JSlider.VERTICAL, -180, 180, 0);

JSlider slA10 = new JSlider(JSlider.VERTICAL, 0, 100, 0);
JSlider slPHI10 = new JSlider(JSlider.VERTICAL, -180, 180, 0);

JLabel txtStatusBar = new JLabel();


public void init() {
// System.out.println("init");

Container c = getContentPane();

BorderLayout layoutMain = new BorderLayout();
c.setLayout(layoutMain);


c.add("Center", display);


Container cEast = new Container();
GridLayout lEast = new GridLayout(5,1);
cEast.setLayout(lEast);


cEast.add(butST);
butST.addActionListener( this );
cEast.add(butAF);
butAF.addActionListener( this );
cEast.add(butPHIF);
butPHIF.addActionListener( this );
cEast.add(butAFPHIF);
butAFPHIF.addActionListener( this );
cEast.add(butSOUND);
butSOUND.addActionListener( this );

c.add("East", cEast);

Container cSouth = new Container();
GridLayout layoutSouth = new GridLayout(2,1);
cSouth.setLayout(layoutSouth);

Container cSouthUp = new Container();


GridLayout layoutSouthUp = new GridLayout(1,12);
cSouthUp.setLayout(layoutSouthUp);

cSouthUp.add(slF1);
slF1.addChangeListener( this );
cSouthUp.add(slA0);
slA0.addChangeListener( this );
cSouthUp.add(slA1);
slA1.addChangeListener( this );

Container cHarm2 = new Container();
GridLayout lHarm2 = new GridLayout(2,1);
cHarm2.setLayout(lHarm2);
cHarm2.add(slA2);
cHarm2.add(slPHI2);
slA2.addChangeListener( this );
slPHI2.addChangeListener( this );
cSouthUp.add(cHarm2);

Container cHarm3 = new Container();
GridLayout lHarm3 = new GridLayout(2,1);
cHarm3.setLayout(lHarm3);
cHarm3.add(slA3);
cHarm3.add(slPHI3);
slA3.addChangeListener( this );
slPHI3.addChangeListener( this );
cSouthUp.add(cHarm3);

Container cHarm4 = new Container();
GridLayout lHarm4 = new GridLayout(2,1);
cHarm4.setLayout(lHarm4);
cHarm4.add(slA4);
cHarm4.add(slPHI4);
slA4.addChangeListener( this );
slPHI4.addChangeListener( this );
cSouthUp.add(cHarm4);

Container cHarm5 = new Container();
GridLayout lHarm5 = new GridLayout(2,1);
cHarm5.setLayout(lHarm5);
cHarm5.add(slA5);
cHarm5.add(slPHI5);
slA5.addChangeListener( this );
slPHI5.addChangeListener( this );
cSouthUp.add(cHarm5);

Container cHarm6 = new Container();
GridLayout lHarm6 = new GridLayout(2,1);
cHarm6.setLayout(lHarm6);
cHarm6.add(slA6);
cHarm6.add(slPHI6);
slA6.addChangeListener( this );
slPHI6.addChangeListener( this );
cSouthUp.add(cHarm6);

Container cHarm7 = new Container();
GridLayout lHarm7 = new GridLayout(2,1);
cHarm7.setLayout(lHarm7);
cHarm7.add(slA7);
cHarm7.add(slPHI7);
slA7.addChangeListener( this );
slPHI7.addChangeListener( this );
cSouthUp.add(cHarm7);


Container cHarm8 = new Container();
GridLayout lHarm8 = new GridLayout(2,1);
cHarm8.setLayout(lHarm8);
cHarm8.add(slA8);
cHarm8.add(slPHI8);
slA8.addChangeListener( this );
slPHI8.addChangeListener( this );
cSouthUp.add(cHarm8);

Container cHarm9 = new Container();
GridLayout lHarm9 = new GridLayout(2,1);
cHarm9.setLayout(lHarm9);
cHarm9.add(slA9);
cHarm9.add(slPHI9);
slA9.addChangeListener( this );
slPHI9.addChangeListener( this );
cSouthUp.add(cHarm9);

Container cHarm10 = new Container();
GridLayout lHarm10 = new GridLayout(2,1);
cHarm10.setLayout(lHarm10);
cHarm10.add(slA10);
cHarm10.add(slPHI10);
slA10.addChangeListener( this );
slPHI10.addChangeListener( this );
cSouthUp.add(cHarm10);


cSouth.add(cSouthUp);
cSouth.add(txtStatusBar);

c.add("South", cSouthUp);


}

public void start() {
// System.out.println("start");

sgn = new CSignal();

sliders_to_sgn();
//sgn_to_slider();
}

/*
public void stop() {
System.out.println("stop");
}
*/

/*
public void destroy() {
System.out.println("destroy");
}
*/


/*
public void paint( Graphics g ) {
System.out.println("paint");

//g.drawString("paint",10,10);
}
*/

/*
public void sliders_init()
{

}
*/


public void sliders_to_sgn()
{
sgn.set_f1(slF1.getValue());
sgn.set_a0(slA0.getValue()/100.0);
sgn.set_a1(slA1.getValue()/100.0);

sgn.set_amplitude(2, slA2.getValue()/100.0);
sgn.set_phase(2, slPHI2.getValue());

sgn.set_amplitude(3, slA3.getValue()/100.0);
sgn.set_phase(3, slPHI3.getValue());

sgn.set_amplitude(4, slA4.getValue()/100.0);
sgn.set_phase(4, slPHI4.getValue());

sgn.set_amplitude(5, slA5.getValue()/100.0);
sgn.set_phase(5, slPHI5.getValue());

sgn.set_amplitude(6, slA6.getValue()/100.0);
sgn.set_phase(6, slPHI6.getValue());

sgn.set_amplitude(7, slA7.getValue()/100.0);
sgn.set_phase(7, slPHI7.getValue());

sgn.set_amplitude(8, slA8.getValue()/100.0);
sgn.set_phase(8, slPHI8.getValue());

sgn.set_amplitude(9, slA9.getValue()/100.0);
sgn.set_phase(9, slPHI9.getValue());

sgn.set_amplitude(10, slA10.getValue()/100.0);
sgn.set_phase(10, slPHI10.getValue());

//sgn.Test_Signal();
}


public void sgn_to_sliders()
{
//slF1.setValue(((int) sgn.get_f1()));
//slA0.setValue(((int) sgn.get_a0()*100.0));
//slA1.setValue(((int) sgn.get_a1()*100.0));

//sgn.set_amplitude(2,slA2.getValue()/100.0);
//sgn.set_phase(2,slPHI2.getValue());


//sgn.Test_Signal();
}





public void actionPerformed(ActionEvent e){

Frame fr=null;
Component parentCourant=this;
while (parentCourant!=null && fr==null) {
if (parentCourant instanceof Frame) fr=(Frame)parentCourant;
else parentCourant=parentCourant.getParent();
}

if (e.getSource() == butST )
{
// traitement bouton s(t)
MsgBox.affMsg(fr, "s(t) !");
}
else
{
System.out.println("TO DO");
MsgBox.affMsg(fr, "TO DO !");
}

}

/*
class sliderListener implements ChangeListener {
public void actionPerformed(ActionEvent e){

}
}
*/

//public Graphics m_g; // = new Graphics();

public void stateChanged(ChangeEvent e) {
//System.out.println("SLIDERS CHANGED !");

sliders_to_sgn();

//sgn.Test_Signal();

//Draw(m_g);
}




public class Display extends Canvas
{
public void paint( Graphics g ) {
//System.out.println("paint canvas");
// g.drawString("paint canvas",10,10);

//m_g = g;


Draw(g);

}

void Draw(Graphics g)
{
if (mode == 0)
{
DrawST(g);
}
else
{
throw new RuntimeException("undefinded_mode");
}
}


void DrawST( Graphics g )
{
double x_min = 0;
double y_min = 0;
double x_max = this.getSize().width;
double y_max = this.getSize().height;

double Nb_pts = 100;

double T1 = 1/(sgn.get_f1());
double t_min = -T1/2;
double t_max = T1/2;

//double t = t_min;
double s = sgn.get_value(-T1/1);
double s_min = sgn.get_value(-T1/1);
double s_max = sgn.get_value(-T1/1);


for (double time=t_min+T1/Nb_pts ; time<t_max ; time+=T1/Nb_pts)
{
s = sgn.get_value(time);
if (s>s_max)
{
s_max=s;
}
if (s<s_min)
{
s_min=s;
}
}

double x0 = x_min;
double y0 = (y_max-y_min)/(s_max-s_min)*(sgn.get_value(t_min))+y_max/2;

double x1 =0;
double y1 = 0;

g.setColor(Color.red);
for (double time=t_min+T1/Nb_pts ; time<=t_max ; time+=T1/Nb_pts)
{
x1 = (x_max-x_min)/(t_max-t_min)*(time-t_min)+t_min;
y1 = (y_max-y_min)/(s_max-s_min)*(sgn.get_value(time))+y_max/2;
g.drawLine((int) x0, (int) y0, (int) x1, (int) y1);
x0 = x1;
y0 = y1;
}
g.setColor(Color.black);

g.drawLine((int) x_min, (int) y_max/2, (int) x_max, (int) y_max/2);
// GND
g.drawLine((int) x_max/2, (int) y_min, (int) x_max/2, (int) y_max);
// VERTICAL CENTRE
g.drawLine((int) x_min, (int) y_min, (int) x_max, (int) y_min); // SUD
g.drawLine((int) x_min, (int) y_max, (int) x_max, (int) y_max); // NORD
g.drawLine((int) x_min, (int) y_min, (int) x_min, (int) y_max); // EST
g.drawLine((int) x_max, (int) y_min, (int) x_max, (int) y_max); //
OUEST

}

}

}




class MsgBox extends JDialog implements ActionListener {
boolean id=false; //permet de connaitre le bouton utilise
Button ok,can;

MsgBox(Frame fr, String msg, boolean okcan) {
//constructeur herite
super(fr, "Message", true);
//gestionnaire de positionnement
setLayout(new BorderLayout());
//ligne de message
add(BorderLayout.CENTER,new Label(msg,Label.CENTER));
//boutons
Panel p=new Panel();
p.setLayout(new FlowLayout());
ok=new Button(" OK ");
p.add(ok);
ok.addActionListener(this);
if (okcan) {
can=new Button("Annule");
p.add(can);
can.addActionListener(this);
}
add(BorderLayout.SOUTH,p);
//dimensions et positionnement
pack();
Dimension d=getToolkit().getScreenSize();
setLocation(d.width/3,d.height/3);
//affichage
setVisible(true);
}

public void actionPerformed(ActionEvent e) {
if(e.getSource()==ok) {
id=true;
setVisible(false);
}
else if(e.getSource()==can) {
id=false;
setVisible(false);
}
}

public static void affMsg(Frame fr, String msg) {
MsgBox message=new MsgBox(fr, msg, false);
message.dispose();
}

public static boolean affQuest(Frame fr, String msg) {
MsgBox message=new MsgBox(fr, msg,true);
boolean rep=message.id;
message.dispose();
return rep;
}
}


*
* Signal
*/
public class CSignal
{
private double m_a0;
private double m_f1;
private double m_a1;

private int N = 11; // nb max d'harmoniques = N-1

private double[] m_a = new double[N]; // amplitude des harmoniques
private double[] m_ph = new double[N]; // phase des harmoniques


CSignal()
{
/* Initialisation (Inutile en Java)
double dvalue = 0;
m_a0=dvalue;
m_f1=dvalue;
m_a1=dvalue;

for (int i=2 ; i<N ; ++i)
{
m_a[i] = dvalue;
m_ph[i] = dvalue;
}
*/

}


double get_a0()
{
return m_a0;
}

double get_f1()
{
return m_f1;
}

double get_a1()
{
return m_a1;
}

double get_amplitude(int n)
{
if (n>=2 && n<=N-1)
{
return m_a[n];
}
else
{
throw new RuntimeException("get_amplitude_exception");
}
}

double get_phase(int n)
{
if (n>=2 && n<=N-1)
{
return m_ph[n];
}
else
{
throw new RuntimeException("get_phase_exception");
}
}


void set_a0(double a0)
{
//if (a0>=0 && a0<=1.0)
// {
m_a0=a0;
// }
// else
// {
//throw "set_a0_exception";
// }
}

void set_f1(double f1)
{
if (f1>=20.0 && f1<=20000.0)
{
m_f1 = f1;
}
else
{
throw new RuntimeException("set_f1_exception");
}
}

void set_a1(double a1)
{
if (a1>=0) //&& a1<=1.0)
{
m_a1 = a1;
}
else
{
throw new RuntimeException("set_a1_exception");
}
}

void set_amplitude(int n, double amplitude)
{
if (n>=2 && n<=N-1 && amplitude>=0 && amplitude<=1.0)
{
m_a[n] = amplitude;
}
else
{
System.out.println("set exc");
throw new RuntimeException("set_amplitude_exception");
}
}

void set_phase(int n, double phase)
{
if (n>=2 && n<=N-1 && phase>=-180.0 & phase<=180.0)
{
m_ph[n] = phase;
}
else
{
System.out.println("set exc");

throw new RuntimeException("set_phase_exception");
}
}


double get_value(double time)
{
double pi = Math.PI; //4.0 * atan (1.0) ; // pi
double value = m_a0;
value += m_a1*Math.sin(2*pi*m_f1*time);
for (int i=2 ; i<=N-1 ; i++)
{
value += m_a1*get_amplitude(i)*Math.sin( 2*pi*m_f1*i*time +
get_phase(i)*pi/180.0 );
}
return value;
}




void Test_Signal()
{
System.out.println("Test_Signal");

System.out.println("a0 = " + m_a0);
System.out.println("f1 = " + m_f1);
System.out.println("a1 = " + m_a1);

for (int i=2 ; i<N ; ++i)
{
System.out.println("a" + i + " = " + m_a[i]);
System.out.println("ph" + i + " = " + m_ph[i]);
}
}

void Test_value()
{

double T1 = 1/m_f1;

for (double time=-T1/2 ; time<T1/2 ; time+=T1/100)
{
System.out.println(time + "\t" + get_value(time));
}
}



}