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getting errors in java for an assignment

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Join Date: Nov 2008

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mangoxoxo

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getting errors in java for an assignment

Nov 19th, 2008

ASSIGNMENT: In section 6.1 of the text, the
authors explain how to compute the distance between two colors. They write,
The Pixel class has an object method colorDistance(Color color)
which returns the distance between the color in the current Pixel object and the
passed color.
Write a method which takes three arguments, a Color, targetColor, and an int, distance,
and a second Color, newColor. Define the method so that it changes the color each
Pixel in _picture that is within distance of the targetColor to newColor.

Now experiment with this method and the redMotorcycle.jpg picture to find a good value
for the distance from java.awt.Color.RED which will change the color of the
motorcycle’s red parts to java.awt.Color.WHITE. Write the value you think works best
into a comment for the method you wrote.

WHAT I HAVE SO FAR:

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
import java.awt.Color;
public class PhotoOps{
  private Picture _picture;
 
  public PhotoOps(String n) {
    String _filename="/eng/class/notes/cse113/intro-prog-java/mediasources" + n;
    _picture=new Picture(_filename);
    _picture.show();
  }
 
 
  public double colorDistance(Color newColor, Color targetColor) {
    Pixel [] pixels=_picture.getPixels();
    int i=0;
    while (i<pixels.length){
      newColor(pixels[i]);
      targetColor(pixels[i]);
      i=i+1;
   double redDistance = targetColor.getRed() - newColor.getRed();
   double greenDistance = targetColor.getGreen() - newColor.getGreen();
   double blueDistance = targetColor.getBlue() - newColor.getBlue();
   double distance = Math.sqrt(redDistance * redDistance + 
                               greenDistance * greenDistance +
                               blueDistance * blueDistance);
    }
  }
}
import java.awt.Color;
public class PhotoOps{
  private Picture _picture;
  
  public PhotoOps(String n) {
    String _filename="/eng/class/notes/cse113/intro-prog-java/mediasources" + n;
    _picture=new Picture(_filename);
    _picture.show();
  }
  
  
  public double colorDistance(Color newColor, Color targetColor) {
    Pixel [] pixels=_picture.getPixels();
    int i=0;
    while (i<pixels.length){
      newColor(pixels[i]);
      targetColor(pixels[i]);
      i=i+1;
   double redDistance = targetColor.getRed() - newColor.getRed();
   double greenDistance = targetColor.getGreen() - newColor.getGreen();
   double blueDistance = targetColor.getBlue() - newColor.getBlue();
   double distance = Math.sqrt(redDistance * redDistance + 
                               greenDistance * greenDistance +
                               blueDistance * blueDistance);
    }
  }
}

ERRORS I'M GETTING:
2 errors found:
File: /Users/jsmith/Desktop/drjava-stable-20050814-2234-osx/CSE113/PhotoOps.java [line: 16]
Error: cannot find symbol
symbol : method newColor(Pixel)
location: class PhotoOps
File: /Users/jsmith/Desktop/drjava-stable-20050814-2234-osx/CSE113/PhotoOps.java [line: 17]
Error: cannot find symbol
symbol : method targetColor(Pixel)
location: class PhotoOps

any help would be greatly appreciated!
thanks

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Join Date: Feb 2006

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masijade

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Re: getting errors in java for an assignment

Nov 19th, 2008

You still need to create the public Color newColor(Pixel pixel) method that you are attempting to use.

Java Programmer and Sun Systems Administrator

----------------------------------------------

Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it.
--Brian Kernighan

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Join Date: Nov 2008

Posts: 3

Reputation: mangoxoxo is an unknown quantity at this point

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mangoxoxo

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Re: getting errors in java for an assignment

Nov 19th, 2008

where would that go?
i put it here

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
 public Color newColor(Pixel pixel);
  public double colorDistance(Color newColor, Color targetColor) {
    Pixel [] pixels=_picture.getPixels();
    int i=0;
    while (i<pixels.length){
      newColor(pixels[i]);
      targetColor(pixels[i]);
      i=i+1;
 public Color newColor(Pixel pixel);
  public double colorDistance(Color newColor, Color targetColor) {
    Pixel [] pixels=_picture.getPixels();
    int i=0;
    while (i<pixels.length){
      newColor(pixels[i]);
      targetColor(pixels[i]);
      i=i+1;