Points Class Problem

The method you gave me worked, but now the other method that my professor gave me isn't working.Is there something else I need to import?

heres is the section that is throwing errors now.

import java.util.Scanner;

import java.awt.Point;

public class program3

{

public static void main(String[] args)

{

PointCat= new Point();

PointDog= new Point();

doublex, y, z, a, b;

doubleCatStepSize = 0.001, DogStepSize;

Scanner Keyboard = new Scanner(System.in);

System.out.print("Please enter 5 numbers which are between 1 and 1,000 ");

System.out.println("that will represent the variable x,y,z,a, and b: ");

System.out.print("x: ");

x = Keyboard.nextDouble();

System.out.print("y: ");

y = Keyboard.nextDouble();

System.out.print("z: ");

z = Keyboard.nextDouble();

System.out.print("a: ");

a = Keyboard.nextDouble();

System.out.print("b: ");

b = Keyboard.nextDouble();

Dog.setLocation(x,y);

DogStepSize = CatStepSize * (b/a);

Cat.moveInDirection(0.0, z);

Cat.moveTowardPoint(x, y, CatStepSize);

}

}

Compiler Errors:

program3.java:49: cannot find symbol

symbol : method moveInDirection(double,double)

location: class java.awt.Point

Cat.moveInDirection(0.0, z);

^

program3.java:49: cannot find symbol

symbol : method moveTowardPoint(double,double,double)

location: class java.awt.Point

Cat.moveTowardPoint(x,y,CatStepSize);

^

2 errors

None of the methods he has given me are working with my double variables, or ints when I changed them.

The methods he has given me are:

setX, setY, getX, getY, moveInDirection, moveTowardPoint, and distanceFrom.

He says we will have to use all and I know that, but none of them are working for me. Sorry if I seem completely retarded but he gave me that and no import statements, and also said we would need our variables to be doubles.

Contradicting info is driving me off the wall, so any help again would be great, thanks.

Message was edited by:

Bmiller234

Bmiller234a at 2007-7-15 4:42:13 >

I've looked through my notes and found this.

Paper says:

From now on students may use our new and fully-operational Point class. If you wish to use this new object in one of your programs you must be sure to place the file Point.java in the same folder with the program.

Point.java:

import java.util.Random;

public class Point

{

private double X, Y;

private final double PI = 3.14159265358979;

public Point()

{

X = 0.0;

Y = 0.0;

}

// end constructor

public void setX(double A)

{

X = A;

return;

}

// end public method setX

public void setY(double A)

{

Y = A;

return;

}

// end public method setY

public double getX()

{

return X;

}

// end public method getX

public double getY()

{

return Y;

}

// end public method getY

public void moveInDirection(double dir, double dist)

{

X = X + dist*Math.cos(dir*PI/180.0);

Y = Y + dist*Math.sin(dir*PI/180.0);

return;

}

// end public method moveInDirection

public void moveTowardPoint(double a, double b, double increment)

{

double distance;

distance = Math.sqrt((a-X)*(a-X) + (b-Y)*(b-Y));

X = X + (increment/distance)*(a-X);

Y = Y + (increment/distance)*(b-Y);

return;

}

// end public method moveTowardPoint

public double distanceFrom(double A, double B)

{

return Math.sqrt((X-A)*(X-A) + (Y-B)*(Y-B));

}

// end public method distanceFrom

public String toString()

{

String result;

result = "(" + X + ", " + Y +")";

return result;

}

// end public method toString

public int whichQuadrant()

{

if (X > 0.0 && Y > 0.0)

return 1;

else if (X < 0.0 && Y > 0.0)

return 2;

else if (X < 0.0 && Y < 0.0)

return 3;

else if (X > 0.0 && Y < 0.0)

return 4;

else

return 0;

// end if

}

// end public method whichQuadrant

public void randomLocation(double A, double B, double C, double D)

{

Random generator = new Random();

if (A >= B || C >= D)

{

System.out.println("Illegal parameters for method randomLocation!");

System.exit(0);

}

// end if

X = (B-A)*generator.nextDouble() + A;

Y = (D-C)*generator.nextDouble() + C;

return;

}

// end public method randomLocation

}

// end class Point

So I added this file to my cs200 folder (where all my java programs are held) and it still doesn't work. Do I need to import this somehow? or add it to my program all together? Or will this even allow me to use doubles as arguments.

Sorry for the complete confusion but I have not been told this before its getting rediculous. I know that the point class has no methods named moveTowardPoint or moveInDirection, but just is confusing when the professor has not told me anything specific...at all.

Sorry again for this stupidity but I have been doing this for probably about 2 months now.

Bmiller234a at 2007-7-15 4:42:13 >

Well after all of that working I'm now stuck.

I believe I'm stuck in the while loop, but not sure why, well have an Idea.

I need to create a while loop that continues until the cat reaches the tree, or until the dog catches the cat. It compiles good, but will never produce output, or takes too long to.

Any help would be greatly appreciated again.

Here is the code:

import java.util.Scanner;

//import java.awt.Point;

public class program3

{

public static void main(String[] args)

{

PointCat= new Point();

PointDog= new Point();

doublex, y, z, a, b;

doubleCatStepSize = 0.001, DogStepSize;

boolean CatReachesTree = false, DogCatchesCat = false;

Scanner Keyboard = new Scanner(System.in);

System.out.print("Please enter 5 numbers which are between 1 and 1,000 ");

System.out.println("that will represent the variable x,y,z,a, and b: ");

System.out.print("x: ");

x = Keyboard.nextDouble();

System.out.print("y: ");

y = Keyboard.nextDouble();

System.out.print("z: ");

z = Keyboard.nextDouble();

System.out.print("a: ");

a = Keyboard.nextDouble();

System.out.print("b: ");

b = Keyboard.nextDouble();

Dog.setX(x);

Dog.setY(y);

DogStepSize = CatStepSize * (b/a);

Cat.moveTowardPoint(z, 0.0, CatStepSize);

Cat.getX();

Cat.getY();

Dog.moveTowardPoint((Cat.getX()),(Cat.getY()),DogStepSize);

Dog.getX();

Dog.getY();

//System.out.println((Cat.distanceFrom(0.0, z)));

while (!CatReachesTree && !DogCatchesCat);

{

Cat.moveTowardPoint(z, 0.0, CatStepSize);

Dog.moveTowardPoint((Cat.getX()), (Cat.getY()), DogStepSize);

if (Cat.getX() >= z)

CatReachesTree = true;

if (Dog.getX() >= Cat.getX())

DogCatchesCat = true;

if (CatReachesTree = true)

System.out.println("The cat made it safely to the Tree!");

if (DogCatchesCat = true)

System.out.print("The dog caught the cat!");

}

}

}

Once again a clean compile just no output. Maybe my code is a little off, but I have tested up the page to Cat.getX() and it is moving.

Message was edited by:

Bmiller234

Bmiller234a at 2007-7-15 4:42:13 >

import java.util.Scanner;

//import java.awt.Point;

public class program3

{

public static void main(String[] args)

{

Pointcat= new Point();

Pointdog= new Point();

doublex, y, z, a, b;

doublecatStepSize = 0.001, dogStepSize;

boolean catReachesTree = false, dogCatchesCat = false;

Scanner Keyboard = new Scanner(System.in);

System.out.print("Please enter 5 numbers which are between 1 and 1,000 ");

System.out.println("that will represent the variable x,y,z,a, and b: ");

System.out.print("x: ");

x = Keyboard.nextDouble();

System.out.print("y: ");

y = Keyboard.nextDouble();

System.out.print("z: ");

z = Keyboard.nextDouble();

System.out.print("a: ");

a = Keyboard.nextDouble();

System.out.print("b: ");

b = Keyboard.nextDouble();

dog.setX(x);

dog.setY(y);

dogStepSize = catStepSize * (b/a);

cat.moveTowardPoint(z, 0.0, catStepSize);

cat.getX();

cat.getY();

dog.moveTowardPoint((cat.getX()),(cat.getY()),dogStepSize);

dog.getX();

dog.getY();

//System.out.println((Cat.distanceFrom(0.0, z)));

while (!catReachesTree && !dogCatchesCat);

{

cat.moveTowardPoint(z, 0.0, catStepSize);

dog.moveTowardPoint((cat.getX()), (cat.getY()), dogStepSize);

if (cat.getX() >= z)

catReachesTree = true;

if (dog.getX() >= cat.getX())

dogCatchesCat = true;

if (catReachesTree == true)

System.out.println("The cat made it safely to the Tree!");

if (dogCatchesCat == true)

System.out.print("The dog caught the cat!");

}

}

}

Fixed the statements, and it is still locked up, no output.

I'm guessing my conditions are incorrect.

Trying to move the cat first toward z (which is the tree), then the dog is moving toward the cat through the cats movement toward the tree.

Sorry about the variables, they are all lowercase, and I am new to making variables respectful.

Sorry again for this tedious posting, but I am stuck.

The help on the other part got me through all of this and now I believe I am stuck in a loop either that or the step size is too small so it is taking to long?

Thanks again.

Bmiller234a at 2007-7-15 4:42:13 >

>"Another thing, shouldn't the professors Point class extend the orginal Point class in awt? All he is doing is adding funcanablitily to the original class so extending it would be logical..."

I would think so, but my professors Point class did not work until I commented awt. Weird yes, but it was the only way it would work that I could see.

Bmiller234a at 2007-7-15 4:42:13 >

I guess this is what I get for staring at this screen all day, careless errors.

Okay now the loop works, but now my problem is all I get is that the dog caught the cat, even with the values that the cat should make it safely to the tree.

I'm going to work with this for a while and if I'm still stuck may attempt to post again.

Thank you for your responses and not ridiculing me of my carelessness.

Bah.

Bmiller234a at 2007-7-15 4:42:13 >

Move the

if (catReachesTree == true)

System.out.println("The cat made it safely to the Tree!");

if (dogCatchesCat == true)

System.out.print("The dog caught the cat!");

out of the loop.

Vagabona at 2007-7-21 12:49:59 >

Just thinking out loud:

//cat.method( Y2 value, Y1 value, distance?)

cat.moveTowardPoint(z, 0.0, catStepSize);

//dog.method(cat's x, cat's y, distance)

//Why are you useing the cat's x? nvm

dog.moveTowardPoint((cat.getX()), (cat.getY()), dogStepSize);

if (cat.getX() >= z)

catReachesTree = true;

if (dog.getX() >= cat.getX())

dogCatchesCat = true;

public void moveTowardPoint(double a, double b, double increment)

{

double distance;

//a = y2? b = y1? increment is what? how far they are moveing

//okay totalDistance - how far is moved

distance = Math.sqrt((a-X)*(a-X) + (b-Y)*(b-Y));

X = X + (increment/distance)*(a-X);

Y = Y + (increment/distance)*(b-Y);

return;

}

Vagabona at 2007-7-21 12:49:59 >

made more reable (note don't have time to finish, change variable names)

import java.util.Scanner;

//import java.awt.Point;

public class program3

{

public static void main(String[] args)

{

Pointcat= new Point();

Pointdog= new Point();

doublex, y, z, a, b;

doublecatStepSize = 0.001, dogStepSize;

boolean catReachesTree = false, dogCatchesCat = false;

Scanner Keyboard = new Scanner(System.in);

System.out.print("Please enter 5 numbers which are between 1 and 1,000 ");

System.out.println("that will represent the variable x,y,z,a, and b: ");

System.out.print("x: ");

x = Keyboard.nextDouble();

System.out.print("y: ");

y = Keyboard.nextDouble();

System.out.print("z: ");

z = Keyboard.nextDouble();

System.out.print("a: ");

a = Keyboard.nextDouble();

System.out.print("b: ");

b = Keyboard.nextDouble();

dog.setX(x);

dog.setY(y);

//dogStepSize = catStepSize * (b/a);

//simplified to dogStepSize = 1 *(b/a) on to

dogStepSize = b/a;

cat.moveTowardPoint(z, 0.0, catStepSize);

//cat.getX(); not used

//cat.getY();

dog.moveTowardPoint((cat.getX()),0.0,dogStepSize);

dog.getX();

dog.getY();

//System.out.println((Cat.distanceFrom(0.0, z)));

while (!catReachesTree && !dogCatchesCat)

{

cat.moveTowardPoint(z, 0.0, catStepSize);

dog.moveTowardPoint((cat.getX()), (cat.getY()), dogStepSize);

if (cat.getX() >= z)

catReachesTree = true;

if (dog.getX() >= cat.getX())

dogCatchesCat = true;

}

if (catReachesTree = true)

System.out.println("The cat made it safely to the tree!");

else

System.out.println("The dog caught the cat!");

}

}

What a sec, are not the cat and dog starting out at the same place? No nvm that

g2g

Vagabona at 2007-7-21 12:50:04 >

I really, really, really hate to do this, but look at this and see if it works:

import java.util.Scanner;

import java.util.Random;

public class program3

{

public static void main(String[] args)

{

Pointcat= new Point();

Pointdog= new Point();

doublecatX, dogX, treeX;

doublecatStepSize, dogStepSize;

boolean catReachesTree = false, dogCatchesCat = false;

Scanner Keyboard = new Scanner(System.in);

System.out.println("Please enter 5 numbers which are between 1 and 1,000 ");

System.out.print("Dog's x: ");

dogX = Keyboard.nextDouble();

System.out.print("Cat's x: ");

catX = Keyboard.nextDouble();

System.out.print("Tree's x: ");

treeX = Keyboard.nextDouble();

System.out.print("Cat Step Size: ");

catStepSize = Keyboard.nextDouble();

System.out.print("Dog Step Size: ");

dogStepSize = Keyboard.nextDouble();

dog.setX(dogX);

dog.setY(0.0);

cat.setX(catX);

cat.setY(0.0);

while (!catReachesTree && !dogCatchesCat)

{

cat.moveTowardPoint(treeX, 0.0, catStepSize);

dog.moveTowardPoint((cat.getX()), (cat.getY()), dogStepSize);

if (cat.getX() >= treeX)

catReachesTree = true;

if (dog.getX() >= cat.getX())

dogCatchesCat = true;

}

if (catReachesTree = true)

System.out.println("The cat made it safely to the tree!");

else

System.out.println("The dog caught the cat!");

}

}

CaptainMorgan08a at 2007-7-21 12:50:04 >

General dubug hint:

Add a

System.out.println("Dog: X:" +dog.getX() + " Y: " dog.getY()");

System.out.println("Cat: X:" +cat.getX() + " Y: " cat.getY()");

inside the while loop.

Then look at the results, so you can see what happens during a run.

You will often get a cubic *ton of text, but you will also be able to see what the numbers are doing, and say "Ahah! I forgot to (whatever)!"

Then, once it works, comment out or remove the debug lines.

BobCa at 2007-7-21 12:50:04 >