Add another changeColor() method (i.e. you will now have 2 methods called "changeColor"). This one accepts...

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Add another changeColor() method (i.e. you will now have 2 methods called "changeColor"). This one accepts...

Add another changeColor() method (i.e. you will now have 2 methods called "changeColor"). This one accepts an int parameter and changes the color based on that int. The valid colors are "red", "yellow", "green", "blue", "magenta" and "black". In your code, map each color to an integer (e.g. in my code 3 means green.) If the number passed to the method is not valid, change the color to red.

In the bounceTheBall() method, where you test for collisions with top and bottom, add code to change the color of the ball each time it hits the top or bottom (not the sides.) The new color should be randomly decided. Use your new changeColor() method to make the change.

Hint: The following code stores a random int between 1 and 100 inside the integer variable "randomNumber".

randomNumber = (int)(Math.random()*100 + 1)

import javax.swing.*;
import java.awt.*;
import java.awt.geom.*;

/**
* A circle that can be manipulated and that draws itself on a canvas.
*
* @author Derek Green (minor modification of the Circle class written by Michael Kolling and David J. Barnes)
* @version 1.0 (Feb 15, 2004)
* Revised by William Smith Summer 2012
*/

public class Ball
{
private int diameter;
private int xPosition;
private int yPosition;
private String color;
private boolean isVisible;

/**
* Create a new ball at default position with default color.
*/
public Ball()
{
diameter = 30;
xPosition = 20;
yPosition = 20;
color = "blue";
isVisible = true;
draw();
}

/**
* Make this ball visible. If it was already visible, do nothing.
*/
public void makeVisible()
{
isVisible = true;
draw();
}

/**
* Make this ball invisible. If it was already invisible, do nothing.
*/
public void makeInvisible()
{
erase();
isVisible = false;
}

/**
* Move the circle horizontally by 'distance' pixels.
*/
public void moveHorizontal(int distance)
{
//erase();
xPosition += distance;
draw();
}

/**
* Move the circle vertically by 'distance' pixels.
*/
public void moveVertical(int distance)
{
//erase();
yPosition += distance;
draw();
}

/**
* Slowly move the ball horizontally by 'distance' pixels.
*/
public void slowMoveHorizontal(int distance)
{
int delta;

if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}

for(int i = 0; i < distance; i++)
{
xPosition += delta;
draw();
}
}

/**
* Slowly move the ball vertically by 'distance' pixels.
*/
public void slowMoveVertical(int distance)
{
int delta;

if(distance < 0)
{
delta = -1;
distance = -distance;
}
else
{
delta = 1;
}

for(int i = 0; i < distance; i++)
{
yPosition += delta;
draw();
}
}

//-------------------- COSC 1010 LAB 4, add your work here ------------------------
//----------------------------------------------------------------------------------
// Danny Stanley
//Lab 4
//----------------------------------------------------------------------------------

/**
* Bounce the ball around the window.
*/
public void bounceTheBall(int time,int speed)
{
Canvas canvas = Canvas.getCanvas(); //DO NOT CHANGE
int windowWidth = canvas.getWidth();// the width of the window //DO NOT CHANGE
int windowHeight = canvas.getHeight();// the height of the window //DO NOT CHANGE
int deltaX = 1;// +/- velocity in x-direction //DO NOT CHANGE
int deltaY = 1;// +/- velocity in y-direction //DO NOT CHANGE

//-----------------------------------------------------------------------
//your speed validation code goes here
//----------------------------------------
if (speed > 1)
{
deltaX = 1 + speed;
deltaY = -1 + speed;
speed = speed + 1;
}

for(int i = 0; i < time; i++)// repeat the following process //DO NOT CHANGE
{
//-----------------------------------------------------------------------
//your collision test code goes here
//test if the ball has collided with the top or bottom, if so reflect it
//test if the ball has collided with a side, if so reflect it
//-
if (xPosition > 270)
{
deltaX = -deltaX;
}
if (xPosition < 0)
{
deltaX = -deltaX;
}
if (yPosition < 0)
{
deltaY = -deltaY;
}
if (yPosition > 570)
{
deltaY = -deltaY;
}

xPosition += deltaX;//moves the ball 1 deltaX unit in the x-direction //DO NOT CHANGE
yPosition += deltaY;//moves the ball 1 deltaY unit in the y-direction //DO NOT CHANGE
draw();// draws the ball at the new position //DO NOT CHANGE
}
}

//-----------------------------------------------------------------------
//add your changeColor method here.
//Valid colors will be in the range 1 - 6 for the six colors.
//You may decide which number (1-6) maps to which color.
//If the value is not in this range, make the circle red.
//-----------------------------------------------------------------------

//-------------------- END OF LAB 4 ------------------------------------------------

/**
* Change the color. Valid colors are "red", "yellow", "blue", "green",
* "magenta" and "black".
*/
public void changeColor(String newColor)
{
if(newColor.equals("yellow") || newColor.equals("blue") || newColor.equals("green") || newColor.equals("magenta") || newColor.equals("black")){
color = newColor;
} else {
color = "red"; //make red the default
}
draw();
}

/*
* Draw the ball with current specifications on screen.
*/
private void draw()
{
if(isVisible) {
Canvas canvas = Canvas.getCanvas();
canvas.draw(this, color, new Ellipse2D.Double(xPosition, yPosition,
diameter, diameter));
canvas.wait(10);
}
}

/*
* Erase the ball on screen.
*/
private void erase()
{
if(isVisible) {
Canvas canvas = Canvas.getCanvas();
canvas.erase(this);
}
}

engineering Computer-Science

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Answer 1

Answer #1

Code

you method

public void changeColor(int Color)
{
if(Color>=1 && Color<=6)
{
if(Color==1)
color = "red";
else if(Color==2)
color = "yellow";
else if(Color==3)
color = "green";
else if(Color==4)
color = "blue";
else if(Color==5)
color = "magenta";
else if(Color==6)
color = "black";
} else {
color = "red"; //make red the default
}
draw();
}

your full code with method;