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Title drawing a simple graph using an applet
Author ajwan
Author Email ajwan83 [at] hotmail.com
Description creating an applet for a simple graph.
Category Java » Java Applets
Hits 26182
Code Select and Copy the Code
import java.applet.*; import java.awt.*; public class hw0125 extends Applet { public void paint(Graphics g) { int newx,newy; // variables for x and y coordinates int k=0; // flag variable int i=20; // for incrementing the size of the lines int w = getSize().width ; // the width of the graphic space int h = getSize().height ;// the height of the graphic space g.drawLine(w/2,h/2,w/2,h/2-10) ; //drawing the line g.drawLine(w/2,h/2-10,w/2-10,h/2-10) ;//drawing the line int x=w/2-10; // x-coordinates int y=h/2-10; // y-coordinates do{ if(k==0) //k is used as a flag to know when to decrement the value newy = y+i; //of the height and when to increment it. else newy = y-i; //************************************************************************ ****** if(((h)-(newy-i) <5)) {g.drawLine(x,y,x,newy+10) ; break;} if(((h)-(newy+i) <5)) {g.drawLine(x,y,x,newy-10) ; break;} if(((h)-newy >=5)&&((w)-x>=5)&&(x>=5)&&(newy>=5)) //stopping case for the graph g.drawLine(x,y,x,newy) ; else break; //************************************************************************ ****** if(k==0) //k is the flag. newx=x+i; //incrementing the width o else newx=x-i; //decrementing the width //************************************************************************ ****** if(((w)-(newx-i) <5)) { g.drawLine(x,newy,newx+10,newy) ; break; } if(((w)-(newx+i) <5)) { g.drawLine(x,newy,newx-10,newy) ; break;} if(((w)-newx>=5)&&((h)-newy>=5)&&(newx>=5)&&(newy>=5)) g.drawLine(x,newy,newx,newy) ; else break; //************************************************************************ ****** if(k==0) //each time the flag k is changed to it's opposite value k=1; //coz we need to increment once and then to decrement else k=0; //************************************************************************ ****** x=newx; //storing the new x-coordinates y=newy; //storing the old x-coordinates i=i+10; }while(i!=10); //dummy case!!! will never happen...the stopping case are inside the loop. } }

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