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# Using the Java GUI

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Write a program that draws a circle with radius 100 and center (200, 200). Ask the user to specify the x- and y-coordinates of a point. Draw the point as a small circle. If the point lies inside the circle, color the small circle green. Otherwise, color it red. In your exercise, declare a class Circle and a method boolean isInside(Point2D.Double p).

Here is a sample program output:

Use the following class as your main class:
import java.awt.geom.Point2D;
import javax.swing.JFrame;
import javax.swing.JOptionPane;

/**
This program views a circle and a pocint.
*/
public class CircleViewerSnap
{
public static void main(String[] args)
{
JFrame frame = new JFrame();

final int FRAME_WIDTH = 400;
final int FRAME_HEIGHT = 400;

frame.setSize(FRAME_WIDTH, FRAME_HEIGHT);
frame.setTitle("CircleViewer");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

Point2D.Double point = new Point2D.Double(150, 150);

CircleComponent component = new CircleComponent(point);

frame.setVisible(true);
}
}

Complete the following classes in your solution:
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.geom.Point2D;
import java.awt.geom.Ellipse2D;

/**
This class implements a circle and a boolean function to
test if a user-given point is inside this circle.
*/
public class Circle
{
private double xCenter;
private double yCenter;
private Color color;

/**
Constructs a circle.
@param x the x-coordinate of the center
@param y the y-coordinate of the center
@param aColor the color
*/
public Circle(double x, double y, double r, Color aColor)
{
xCenter = x;
yCenter = y;
color = aColor;
}

/**
Draws a circle and a point.
@param g2 the graphics content
*/
public void draw(Graphics2D g2)
{
g2.setColor(color);
Ellipse2D.Double circle
g2.draw(circle);
}

/**
Determine if point is inside or outside the circle
@param p the point to test if it is inside the circle
@return true if the point is inside the circle
*/
public boolean isInside(Point2D.Double p)
{
. . .
}
}

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

import javax.swing.JComponent;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Point2D;
import java.awt.geom.Ellipse2D;
import javax.swing.JOptionPane;

/**
Draws a circle and a point. The point is colored green if it falls
inside the circle, red otherwise.
*/
public class CircleComponent extends JComponent
{
private Circle circle;
private Circle smallCircle;

public CircleComponent(Point2D.Double point)
{
circle = new Circle(200, 200, 100, Color.BLACK);
Color color;
if(. . .)
color = Color.GREEN;
else
color = Color.RED;
smallCircle = new Circle(point.getX(), point.getY(), SMALL_RADIUS, color);
}

public void paintComponent(Graphics g)
{
Graphics2D g2 = (Graphics2D) g;
circle.draw(g2);
smallCircle.draw(g2);
}
}

Use the following class in your solution:
import java.awt.geom.Point2D;
import javax.swing.JFrame;
import javax.swing.JOptionPane;

/**
This program views a circle and a point.
*/
public class CircleViewer
{
public static void main(String[] args)
{
JFrame frame = new JFrame();

final int FRAME_WIDTH = 400;
final int FRAME_HEIGHT = 400;

frame.setSize(FRAME_WIDTH, FRAME_HEIGHT);
frame.setTitle("CircleViewer");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

String input = JOptionPane.showInputDialog("x:");
double x = Double.parseDouble(input);

input = JOptionPane.showInputDialog("y:");
double y = Double.parseDouble(input);

Point2D.Double point = new Point2D.Double(x, y);

CircleComponent component = new CircleComponent(point);

frame.setVisible(true);
}
}

I HAVE COME UP WITH THE FOLLOWING CODE BUT CAN'T SEEM TO GET THE POINTER TO WORK. PLEASE HELP.

import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.geom.Point2D;
import java.awt.geom.Ellipse2D;

/**
This class implements a circle and a boolean function to
test if a user-given point is inside this circle.
*/
public class Circle
{
private double xCenter;
private double yCenter;
private Color color;

/**
Constructs a circle.
@param x the x-coordinate of the center
@param y the y-coordinate of the center
@param aColor the color
*/
public Circle(double x, double y, double r, Color aColor)
{
xCenter = x;
yCenter = y;
color = aColor;
}

/**
Draws a circle and a point.
@param g2 the graphics content
*/
public void draw(Graphics2D g2)
{
g2.setColor(color);
Ellipse2D.Double circle
g2.draw(circle);
}

/**
Determine if point is inside or outside the circle
@param p the point to test if it is inside the circle
@return true if the point is inside the circle
*/

public boolean isInside(Point2D.Double p)
{
double distance;

distance = Math.sqrt(Math.pow(xCenter - p.x,2)+(Math.pow(yCenter - p.y,2)));

{
return true;
}
else
{
return false;
}
}
}

------------------------------------------
import javax.swing.JComponent;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Point2D;
import java.awt.geom.Ellipse2D;
import javax.swing.JOptionPane;

/**
Draws a circle and a point. The point is colored green if it falls
inside the circle, red otherwise.
*/
public class CircleComponent extends JComponent
{
private Circle circle;
private Circle smallCircle;

public CircleComponent(Point2D.Double point)
{
circle = new Circle(200, 200, 100, Color.BLACK);
Color color;
if (circle.isInside()== true)
color = Color.GREEN;
else
color = Color.RED;
smallCircle = new Circle(point.getX(), point.getY(), SMALL_RADIUS, color);
}

public void paintComponent(Graphics g)
{
Graphics2D g2 = (Graphics2D) g;
circle.draw(g2);
smallCircle.draw(g2);
}
}

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

import java.awt.geom.Point2D;
import javax.swing.JFrame;
import javax.swing.JOptionPane;

/**
This program views a circle and a point.
*/
public class CircleViewer
{
public static void main(String[] args)
{
JFrame frame = new JFrame();

final int FRAME_WIDTH = 400;
final int FRAME_HEIGHT = 400;

frame.setSize(FRAME_WIDTH, FRAME_HEIGHT);
frame.setTitle("CircleViewer");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

String input = JOptionPane.showInputDialog("x:");
double x = Double.parseDouble(input);

input = JOptionPane.showInputDialog("y:");
double y = Double.parseDouble(input);

Point2D.Double point = new Point2D.Double(x, y);

CircleComponent component = new CircleComponent(point);

frame.setVisible(true);
}
}

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

import java.awt.geom.Point2D;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
/**
This program views a circle and a pocint.
*/
public class CircleViewerSnap
{
public static void main(String[] args)
{
JFrame frame = new JFrame();
final int FRAME_WIDTH = 400;
final int FRAME_HEIGHT = 400;
frame.setSize(FRAME_WIDTH, FRAME_HEIGHT);
frame.setTitle("CircleViewer");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Point2D.Double point = new Point2D.Double(150, 150);

CircleComponent component = new CircleComponent(point);
frame.setVisible(true);
}
}

##### Solution Summary

This solution involves using a Java GUI to write a program that will decide if if a point is inside a circle

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