Something different..........

its very very long

/*

<applet code="Dynamics" width=800 height=600>

<param name="img1" value="cart.gif">

<param name="img2" value="mass.gif">

<param name="img3" value="backimg.gif">

</applet>

*/

import java.awt.*;

import java.awt.event.*;

import java.applet.*;

public class Dynamics extends Applet implements Runnable,ActionListener,ItemListener

{

Image img1,img2,img3;

Graphics gr;

Thread t=null;

int accQ,fg;

int[] Af=new int[20];

int[] Am=new int[20];

int[] Aa=new int[20];

int[] AA=new int[20];

double[] fAf=new double[20];

double[] fAm=new double[20];

double[] fAa=new double[20];

double[] fAA=new double[20];

int a=260,b=130,x=522,y=200,i=373,j=200;

int Wc=500,Wm=200,ai=0;

int xGraph=600,yGraph=600;

double Mtot,F,acc;

boolean stopflag,fuWc=false,flWc=true,fuWm=false,flWm=true,fmain=true,fgraph=false,ftable=false,fexit=false;

Label LWc,LWm,La;

Button start,stop,reset,help,BWc,BWc1,BWm,BWm1,graphs,table;

Button exit;

Choice gr1,gr2;

Frame f;

String str1,str2;

public void init()

{

setLayout(null);

setBackground(Color.white);

img1=getImage(getDocumentBase(),getParameter("img1"));

img2=getImage(getDocumentBase(),getParameter("img2"));

img3=getImage(getDocumentBase(),getParameter("img3"));

stopflag=false;

start=new Button("Start");

start.setBounds(275,50,60,30);

stop=new Button("Pause");

stop.setBounds(350,50,60,30);

reset= new Button("Reset");

reset.setBounds(425,50,60,30);

help = new Button("Help");

help.setBounds(500,50,60,30);

BWc=new Button("Add 50 Grams");

BWc.setBounds(185,220,120,25);

BWc1=new Button("Reduce 50 Grams");

BWc1.setBounds(185,245,120,25);

BWm=new Button("Add 100 Grams");

BWm.setBounds(387,320,120,25);

BWm1=new Button("Reduce 100 Grams");

BWm1.setBounds(387,345,120,25);

graphs=new Button("Graphs");

graphs.setBounds(65,300,60,30);

table=new Button("Table");

table.setBounds(65,330,60,30);

exit=new Button("Exit");

exit.setBounds(510,650,60,30);

LWc=new Label();

LWc.setBounds(180,200,125,20);

LWc.setBackground(Color.white);

LWm=new Label();

LWm.setBounds(380,300,130,20);

LWm.setBackground(Color.white);

La=new Label();

La.setBounds(120,115,40,18);

La.setBackground(Color.white);

gr1=new Choice();

gr1.setBounds(150,650,100,25);

gr2=new Choice();

gr2.setBounds(300,650,100,25);

gr1.add("Force");

gr2.add("Force");

gr1.add("Mass");

gr2.add("Mass");

gr1.add("Acceleration");

gr2.add("Acceleration");

gr1.add("1/Acceleration");

gr2.add("1/Acceleration");

cal(Wc,Wm);

add(start);

add(stop);

add(reset);

add(help);

add(BWc);

add(BWc1);

add(BWm);

add(BWm1);

add(LWc);

add(LWm);

add(La);

add(graphs);

add(table);

add(gr1);

add(gr2);

add(exit);

start.addActionListener(this);

stop.addActionListener(this);

reset.addActionListener(this);

help.addActionListener(this);

BWc.addActionListener(this);

BWc1.addActionListener(this);

BWm.addActionListener(this);

BWm1.addActionListener(this);

graphs.addActionListener(this);

table.addActionListener(this);

exit.addActionListener(this);

gr1.addItemListener(this);

gr2.addItemListener(this);

//hidemain(fmain);

hidegraph(fgraph);

}

public void cal(int c,int m)

{

if(Wc>=1000){fuWc=true;}

else fuWc=false;

if(Wc<=500){flWc=true;}

else flWc=false;

if(Wm>=1000){fuWm=true;}

else fuWm=false;

if(Wm<=200){flWm=true;}

else flWm=false;

BWc.setEnabled(!fuWc);

BWc1.setEnabled(!flWc);

BWm.setEnabled(!fuWm);

BWm1.setEnabled(!flWm);

this.Mtot = (m+c)/1000.0;

this.F=m/1000.0*9.81;

this.acc=this.F/this.Mtot;

accQ=(int)((700-acc*100)/4);

LWc.setText("Wieght on Cart: "+Wc+" g");

LWm.setText("Wieght of Mass: "+Wm+" g");

//La.setText((""+acc).substring(0,4)+" m/s2");

//TWc.setText("Wieght on Cart is "+Wc+" Grammes");

//TWm.setText("Wieght of Mass is "+Wm+" Grammes");

//Ta.setText("Acceleration = "+(""+acc).substring(0,4)+" m/s");

}

/*public void start()

{

Graphics g=getGraphics();

g.drawImage(img3,0,0,this);

}

*/

public void run()

{

while(a<=390)

{

try{

a++;y++;i++;j++;

repaint();

Thread.sleep(accQ);

if(stopflag) break;

}catch(InterruptedException e){}

}

}

public void paint(Graphics g)

{

if(fmain==true)

{

fg=0;

g.drawImage(img3,0,0,this);

g.drawImage(img1,a,b,this);

g.drawImage(img2,x,y,this);

g.drawLine(i,148,525,148);

g.drawLine(544,164,544,j);

}

else if(fgraph==true)

{

g.setColor(Color.lightGray);

for(int i=15;i<=xGraph;i+=15)

g.drawLine(i,0,i,yGraph);

for(int j=15;j<=yGraph;j+=15)

g.drawLine(0,j,xGraph,j);

g.setColor(Color.black);

g.drawLine(0,0,xGraph,0);

g.drawLine(0,0,0,yGraph);

g.drawLine(0,yGraph,xGraph,yGraph);

g.drawLine(xGraph,0,xGraph,yGraph);

switch(fg)

{

case 0: break;

case 1: {double ix=.4905,iy=.10;makeGraph(Af,Am,fAf,fAm,ix,iy);break;}

case 2: {double ix=.4905,iy=.327;makeGraph(Af,Aa,fAf,fAa,ix,iy);break;}

case 3: {double ix=.4905,iy=.0306;makeGraph(Af,AA,fAf,fAA,ix,iy);break;}

case 4: {double ix=.10,iy=.327;makeGraph(Am,Aa,fAm,fAa,ix,iy);break;}

case 5: {double ix=.10,iy=.0306;makeGraph(Am,AA,fAm,fAA,ix,iy);break;}

case 6: {double ix=.327,iy=.0306;makeGraph(Aa,AA,fAa,fAA,ix,iy);break;}

default: g.drawString("Data Mismatch",250,250);

}

}

else if(ftable==true)

{

//Font f=new Font("Dialog",Font.BOLD,16);

//setFont(f);

double a=0.0,b=0.0,c=0.0,d=0.0;

String str1,str2,str3,str4;

int j=55,k=0;

//g.drawString("hellow you're in table",20,20);

g.setColor(Color.lightGray);

g.drawLine(0,50,650,50);

g.drawLine(50,0,50,700);

g.setColor(Color.black);

g.drawString("Force (N)",100,45);

g.drawString("Total Mass (Kg)",250,45);

g.drawString("Acceleration (m/s2)",400,45);

g.drawString("1/Acceleration",550,45);

for(int i=0;i<20;i++)

{

j+=15;k++;

a=fAf;str1=(a+"").substring(0,7);

b=fAm;str2=(b+"").substring(0,7);

c=fAa;str3=(c+"").substring(0,7);

d=fAA;str4=(d+"").substring(0,7);

if(a==0.0||b==0.0||c==0.0||d==0.0) break;

if(a==fAf[i+1] && b==fAm[i+1]) {j-=15;k--;}

else

{

g.drawString((""+k),35,j);

g.drawString(str1,100,j);

g.drawString(str2,250,j);

g.drawString(str3,400,j);

g.drawString(str4,550,j);

}

}

}

}

public void update(Graphics g)

{

paint(g);

}

public void hidemain(boolean fmain)

{

start.setVisible(fmain);

stop.setVisible(fmain);

reset.setVisible(fmain);

help.setVisible(fmain);

BWc.setVisible(fmain);

BWc1.setVisible(fmain);

BWm.setVisible(fmain);

BWm1.setVisible(fmain);

LWc.setVisible(fmain);

LWm.setVisible(fmain);

La.setVisible(fmain);

graphs.setVisible(fmain);

table.setVisible(fmain);

}

public void hidegraph(boolean fgraph)

{

exit.setVisible(fexit);

gr1.setVisible(fgraph);

gr2.setVisible(fgraph);

}

public void hide(boolean fmain,boolean fgraph)

{

hidegraph(fgraph);

hidemain(fmain);

Graphics g=getGraphics();

g.setColor(Color.white);

g.fillRect(0,0,800,700);

}

public void makeGraph(int[] arr1,int[] arr2,double[] ar1,double[] ar2,double ix,double iy)

{

int a=0;int b=0;

double da=0.0,db=0.0;

double fx=0.0,fy=0.0;

String str1="",str2="";

Graphics g=getGraphics();

for(int k=0;k<=20;k++)

{

a=arr1[k];b=arr2[k];

da=ar1[k];db=ar2[k];

str1=(da+"").substring(0,3);

str2=(db+"").substring(0,4);

int c=arr1[k+1];int d=arr2[k+1];

if(a==0||b==0||c==0||d==0) break;

g.drawLine(a,yGraph-b,c,yGraph-d);

g.setColor(Color.red);

g.fillOval(a-2,yGraph-2-b,4,4);

g.setColor(Color.black);

g.drawString(("x="+str1+" y="+str2),a,yGraph-b);

}

g.drawString(("x="+str1+" y="+str2),a,yGraph-b);

g.setColor(Color.red);

g.fillOval(a-2,yGraph-2-b,4,4);

g.setColor(Color.black);

for(int i=0;i<xGraph;i+=30)

{

g.drawString(((fx+"").substring(0,4)),i,yGraph+10);

fx+=ix;

}

for(int i=0;i<yGraph;i+=30)

{

g.drawString(((fy+"").substring(0,4)),xGraph+5,yGraph-i+5);

fy+=iy;

}

}

public void actionPerformed(ActionEvent ae)

{

if(ae.getActionCommand().equals("Start"))

{

stopflag=false;

Af[ai]=(int)(F*61.162);

Am[ai]=(int)(Mtot*300);

Aa[ai]=(int)(acc*91.743);

AA[ai]=(int)(1/acc*980.39);

fAf[ai]=F;

fAm[ai]=Mtot;

fAa[ai]=acc;

fAA[ai]=1/acc;

t=new Thread(this);

t.start();

La.setText((""+acc).substring(0,4));

BWc.setEnabled(false);

BWc1.setEnabled(false);

BWm.setEnabled(false);

BWm1.setEnabled(false);

ai++;

System.out.println("M= "+Am[ai]+" acc= "+Aa[ai]+" F= "+Af[ai]+" 1/acc= "+AA[ai]+" ai= "+ai);

}

else if(ae.getActionCommand().equals("Pause"))

{

stopflag=true;

cal(Wc,Wm);

}

else if(ae.getActionCommand().equals("Reset"))

{

La.setText("");

stopflag=true;

i=373;j=200;

a=260;y=200;

Wc=500;Wm=200;

cal(Wc,Wm);

repaint();

}

else if(ae.getActionCommand().equals("Help"))

{f=new Help();

f.setSize(400,400);

f.setVisible(true);

}

else if(ae.getActionCommand().equals("Add 50 Grams"))

{

if(Wc><1000) Wc+=50;

cal(Wc,Wm);

}

else if(ae.getActionCommand().equals("Reduce 50 Grams"))

{

if(Wc>500) Wc-=50;

cal(Wc,Wm);

}

else if(ae.getActionCommand().equals("Add 100 Grams"))

{

if(Wm<1000) Wm+=100;

cal(Wc,Wm);

}

else if(ae.getActionCommand().equals("Reduce 100 Grams"))

{

if(Wm>200) Wm-=100;

cal(Wc,Wm);

}

else if(ae.getActionCommand().equals("Graphs"))

{

fmain=false;

fgraph=true;

fexit=true;

hide(fmain,fgraph);

repaint();

}

else if(ae.getActionCommand().equals("Table"))

{

System.out.println("Table clicked");

fmain=false;

//fgraph=false;

ftable=true;

fexit=true;

hide(fmain,fgraph);

repaint();

}

else if(ae.getActionCommand().equals("Exit"))

{

//System.out.println("exit called");

fgraph=false;

ftable=false;

fexit=false;

fmain=true;

setFont(null);

hide(fmain,fgraph);

repaint();

}

}

public void itemStateChanged(ItemEvent ie)

{

String str1=gr1.getSelectedItem();

String str2=gr2.getSelectedItem();

if(str1=="Force" && str2=="Mass")

{

hide(fmain,fgraph);

fg=1;

repaint();

}

else if(str1=="Force" && str2=="Acceleration")

{

hide(fmain,fgraph);

fg=2;

repaint();

}

else if(str1=="Force" && str2=="1/Acceleration")

{

hide(fmain,fgraph);

fg=3;

repaint();

}

else if(str1=="Mass" && str2=="Acceleration")

{

hide(fmain,fgraph);

fg=4;

repaint();

}

else if(str1=="Mass" && str2=="1/Acceleration")

{

hide(fmain,fgraph);

fg=5;

repaint();

}

else if(str1=="Acceleration" && str2=="1/Acceleration")

{

hide(fmain,fgraph);

fg=6;

repaint();

}

else

{

System.out.println("data mismatch");

hide(fmain,fgraph);

fg=100;

repaint();

}

System.out.println("Item state changed. gr1 = "+str1+" gr2= "+str2);

}

}

bontz at 2007-6-29 9:31:50 >

Well, did you try double buffering? Add the following instance vars:

Image offI;

Graphics offG;

add this to init():

offI = createImage(size().width, size().height);

offG = offI.getGraphics();

and modify paint():

public void paint(Graphics grr) {

Graphics g = offG;

// rest of the code untouched...

grr.drawImage(offI, 0,0,null);

}

jsalonen at 2007-6-29 9:31:50 >

Just noticed something important in your paint method:

> g.drawImage(img3,0,0,this);

> g.drawImage(img1,a,b,this);

> g.drawImage(img2,x,y,this);

Try changing 'this' to null. Right now, when one image gets finished the component is refreshed. This can cause flickering because the other images will then be redrawn - and when they've been fully drawn the component will be refreshed and so on.

jsalonen at 2007-6-29 9:31:51 >