Java Source Code

• Transpose applet

• Multiplication applet

import java.awt.*;
import java.awt.image.*;
import java.applet.*;
import java.lang.*;

public class Transpose extends Applet
{
       Graphics    sG;

       Graphics    bG;
       Image       bI;

       Image       matrices;

       Color       blue    = new Color(0, 0, 255);

       int         x = 0;
       int         y = 0;

       public void init()
       {
              bI = createImage(this.size().width, this.size().height);
              bG = bI.getGraphics();
              matrices = getImage(getCodeBase(), "transpose.gif");
              bG.drawImage(matrices, 0, 0, this);
              drawscreen();
       }  

       public void paint(Graphics g)
       {
              drawscreen();
              g.drawImage(bI, 0, 0, this);
              sG = getGraphics();
       }

       public void drawscreen()
       {
              bG.drawImage(matrices, 0, 0, this);

              check(x, y, 58, 6, 58, 6);
              check(x, y, 58, 28, 97, 6);
              check(x, y, 58, 78, 172, 6);
              check(x, y, 97, 6, 58, 28);
              check(x, y, 97, 28, 97, 28);
              check(x, y, 97, 78, 172, 28);
              check(x, y, 172, 6, 58, 78);
              check(x, y, 172, 28, 97, 78);
              check(x, y, 172, 78, 172, 78);
       }

       public void box(int ix, int iy)
       {
              bG.setColor(blue);
              bG.drawLine(ix, iy, ix + 30, iy);
              bG.drawLine(ix, iy + 20, ix + 30, iy + 20);
              bG.drawLine(ix, iy, ix, iy + 20);
              bG.drawLine(ix + 30, iy, ix + 30, iy + 20);
       }

       public boolean mouseDown(Event evt, int mx, int my)
       {
             x = mx;
             y = my;
             drawscreen();
             sG.drawImage(bI, 0, 0, this);
             return true;
       }

       public void check(int x, int y, int tx, int ty, int px, int py)
       {
            if ((x >= tx) && (x < tx + 31) && (y >= ty) && (y < ty + 21))
            {
                box(tx, ty);
                box(px + 228, py + 1);
            }
            if ((x >= px + 228) && (x <= px + 259) && (y >= py) && (y < py + 21))
            {
                box(tx, ty);
                box(px + 228, py + 1);
            }
       }



}

import java.awt.*;
import java.awt.image.*;
import java.applet.*;
import java.lang.*;

public class Multiply extends Applet
{
       Graphics    sG;

       Graphics    bG;
       Image       bI;

       Image       matrices;

       Color       blue    = new Color(0, 0, 255);

       int         x = 0;
       int         y = 0;

       public void init()
       {
              bI = createImage(this.size().width, this.size().height);
              bG = bI.getGraphics();
              matrices = getImage(getCodeBase(), "multiply.gif");
              bG.drawImage(matrices, 0, 0, this);
              drawscreen();
       }  

       public void paint(Graphics g)
       {
              drawscreen();
              g.drawImage(bI, 0, 0, this);
              sG = getGraphics();
       }

       public void drawscreen()
       {
              bG.drawImage(matrices, 0, 0, this);

              check(x, y, 383, 3, 188);
              check(x, y, 420, 3, 226);
              check(x, y, 493, 3, 298);
              check(x, y, 383, 25, 188);
              check(x, y, 420, 25, 226);
              check(x, y, 493, 25, 298);
              check(x, y, 383, 75, 188);
              check(x, y, 420, 75, 226);
              check(x, y, 493, 75, 298);
              
      }

       public void check(int x, int y, int px, int py, int qx)
       {
              if((x >= px) && (x <= px + 30) && (y >= py) && (y <= py + 20))
              {
                   box(px, py);
                   bG.setColor(blue);
                   bG.drawLine(13, py, 155, py);
                   bG.drawLine(13, py + 20, 155, py + 20);
                   bG.drawLine(13, py, 13, py + 20);
                   bG.drawLine(155, py, 155, py + 20);
                   bG.drawLine(qx, 1, qx, 95);
                   bG.drawLine(qx + 30, 1, qx + 30, 95);
                   bG.drawLine(qx, 1, qx + 30, 1);
                   bG.drawLine(qx, 95, qx + 30, 95);
              }
       }

       public void box(int ix, int iy)
       {
              bG.setColor(blue);
              bG.drawLine(ix, iy, ix + 30, iy);
              bG.drawLine(ix, iy + 20, ix + 30, iy + 20);
              bG.drawLine(ix, iy, ix, iy + 20);
              bG.drawLine(ix + 30, iy, ix + 30, iy + 20);
       }

       public boolean mouseDown(Event evt, int mx, int my)
       {
             x = mx;
             y = my;
             drawscreen();
             sG.drawImage(bI, 0, 0, this);
             return true;
       }



}