Thread: Compiling error

I am not sure of what is wrong with my code, I hope any of you guys can point on it.

Here's my code:

package assignment10;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.io.File;
import java.io.IOException;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;

import javax.imageio.ImageIO;


public class ChainCode {

BufferedImage image;
int width;
int height;

private int direction = 7;


public ChainCode(BufferedImage image){
this.image = image;
this.width = image.getWidth();
this.height = image.getHeight();
}


public ArrayList<Complex> getChainCodePixels(){
ArrayList<Complex> list = new ArrayList<Complex>();

int x,y;
x = y = 0;

outer:
for(y =0;y < height; y++){
for(x=0 ;x < width; x++){
Color c = new Color(image.getRGB(x, y));
if(c.getBlue() > 0){
list.addAll(f(x,y));
break outer;
}
}
}
return list;
}



private ArrayList<Complex> f(int x, int y) {
ArrayList<Complex> code = new ArrayList<Complex>();

Dimension firstCell = new Dimension(x,y);
Dimension d1 = firstCell;
code.add(new Complex(x,y)); //Add cell1

Dimension secondCell = getNextCell8(x, y);
Dimension d2 = secondCell;

do{
x = (int) d2.getWidth();
y = (int) d2.getHeight();

d1 = d2;
d2 = getNextCell8(x, y);
code.add(new Complex(x,y));

}while(!d1.equals(firstCell) && !d2.equals(secondCell) && d2!=null);

code.remove(0); //Since cell1 got added twice.
return code;
}

/**
* 321
* 4_0
* 567
*/
private Dimension getNextCell8(int x, int y){
int startDirection = ((direction & 1) == 0)?((direction+7) % 8)direction+6) % 8);
int i = 0;
Dimension d = null;
while(i<7){
d = getCellInDirection(x, y, startDirection);
if(d != null){
direction = startDirection;
break;
}
startDirection = mod ((startDirection +1), 8);
i++;
}
return d;
}



private Dimension getCellInDirection(int x, int y, int dir){
switch(dir){
case 0:
return (inBounds(x+1,y) && isObjectPixel(x+1,y))?new Dimension(x+1, y):null;
case 1:
return(inBounds(x+1,y-1) && isObjectPixel(x+1,y-1))?new Dimension(x+1, y-1):null;
case 2:
return(inBounds(x,y-1) && isObjectPixel(x,y-1))?new Dimension(x, y-1):null;
case 3:
return(inBounds(x-1,y-1) && isObjectPixel(x-1,y-1))?new Dimension(x-1, y-1):null;
case 4:
return(inBounds(x-1,y) && isObjectPixel(x-1,y))?new Dimension(x-1, y):null;
case 5:
return(inBounds(x-1,y+1) && isObjectPixel(x-1,y+1))?new Dimension(x-1, y+1):null;
case 6:
return(inBounds(x,y+1) && isObjectPixel(x,y+1))?new Dimension(x, y+1):null;
case 7:
return(inBounds(x+1,y+1) && isObjectPixel(x+1,y+1))?new Dimension(x+1, y+1):null;
default:
return null;
}
}



private boolean inBounds(int x, int y){
return ((x>=0 && x<width) && (y>=0 && y<height));
}

private boolean isObjectPixel(int x, int y){
return (new Color(image.getRGB(x, y)).getBlue()>0);
}

private int mod(int a, int b){
assert(b>0);
int k = (int) Math.ceil((float)Math.abs(a)/b);
a += (a<0)?k*b:0;
return a % b;
}

}

It's giving me this error upon compilation:

C:\Users\dv3\Desktop\Chain Code Algo\ChainCode.java:33: error: cannot find symbol
public ArrayList<Complex> getChainCodePixels(){
^
symbol: class Complex
location: class ChainCode
C:\Users\dv3\Desktop\Chain Code Algo\ChainCode.java:54: error: cannot find symbol
private ArrayList<Complex> f(int x, int y) {
^
symbol: class Complex
location: class ChainCode
C:\Users\dv3\Desktop\Chain Code Algo\ChainCode.java:34: error: cannot find symbol
ArrayList<Complex> list = new ArrayList<Complex>();
^
symbol: class Complex
location: class ChainCode
C:\Users\dv3\Desktop\Chain Code Algo\ChainCode.java:34: error: cannot find symbol
ArrayList<Complex> list = new ArrayList<Complex>();
^
symbol: class Complex
location: class ChainCode
C:\Users\dv3\Desktop\Chain Code Algo\ChainCode.java:55: error: cannot find symbol
ArrayList<Complex> code = new ArrayList<Complex>();
^
symbol: class Complex
location: class ChainCode
C:\Users\dv3\Desktop\Chain Code Algo\ChainCode.java:55: error: cannot find symbol
ArrayList<Complex> code = new ArrayList<Complex>();
^
symbol: class Complex
location: class ChainCode
C:\Users\dv3\Desktop\Chain Code Algo\ChainCode.java:59: error: cannot find symbol
code.add(new Complex(x,y)); //Add cell1
^
symbol: class Complex
location: class ChainCode
C:\Users\dv3\Desktop\Chain Code Algo\ChainCode.java:70: error: cannot find symbol
code.add(new Complex(x,y));
^
symbol: class Complex
location: class ChainCode
8 errors

Process completed.