JAVA Objective : To make you comfortable with using the SimpleGUI graphical inte

Question

JAVA

Objective

:

To

make you comfortable with using the SimpleGUI graphical interface and simple Java commands.

About SimpleGUI

:

SimpleGUI is a bunch of

Java code arranged in a collection called a jar file. It's provides a set of Java commands that your program can use to displ

ay graphical

user interfaces, including images, shapes, and text.

Download the latest version of the SimpleGUI jar file

here. The

SimpleGUI website

also has other information and downloads related to SimpleGUI, for those who

are interest

ed. You'll only need the jar file (and the manual, linked to below) for this assignment.

Information on how to use and install SimpleGUI is available in the manual

here, and the javadocs page for SimpleGUI

provides information on the individual

commands that SimpleGUI provides.

For those who don't want to read through all of the

documentation, here's a brief explanation of how to enable SimpleGUI in your program: In NetBeans, find the

project you are working on, or create a new one. In the "Project Explorer" window pane on the left, you'll see two folders that come directly under

neath your project,

one called "Source Packages" and one called "Libraries". Right

-click on the "Libraries" folder, and select "Add JAR/Folder". In the window that pops up, find the

"SimpleGUI.jar" file you downloaded, select it, and click the "Open" butto

n.

You can verify that SimpleGUI is enabled in your Java project by creating a Java class, creating a main method in the Java cl

ass, and putting the following single

instruction in the main method:

demos.Demo03_BasicDrawing.main(null);

When you run the

class you created, it should pop up a menu with a pretty drawing of colorful lines. (It's the same drawing you see on the Sim

pleGUI home page.)

Your program: drawing shapes

Your program will consist of a single Java file, which you should call

ShapeDrawer.java

.

The program should ask the user to enter several numbers and some text. It should then display some shapes and text using Sim

pleGUI.

However, your program should make use of the information that the user enters to affect the output of t

he program. For instance, the program could ask the user to

enter a width and a height, and then display shapes with that size. Or it could ask for an X and Y position, and then place s

hapes at that position.

Here are the requirements for your program:

•

It must create a SimpleG

UI object for input and output.

•

It must display at least 2 different kinds of shapes (eg, ellipsis, rectangle, line).

•

It must prompt the user for at least 2 numbers, then read in those numbers. Those numbers must affect what the program di

splays in some significant way.

•

It must perform at least three arithmetic calculations (+,

-,*,/,%) that involve the input numbers. The results of these calculations must affect what the program

displays in some significant way.

•

It must display text t

hat appears over top of a shape.

•

It must prompt the user to enter at least 1 string, then read in that string. The string must affect what the program display

s in some significant way. (2 points)

•

It must u

se at least 3 different colors.

For each of these requirements, include a comment in your code that indicates what part of the program you believe addresses the requirement.

Helpful hints

The

javadocs page for the SimpleGUI class

includes helpful information on commands like

drawEllipsis()

and

drawText()

that you will find useful for this

assignment. (Scroll down to the section called "Method Summary" for information on the commands that are available.)

You can see a working example demo of

SimpleGUI code

below.

Copy

-and-

paste this into NetBeans if you'd like to run it.

To create a SimpleGUI window, you should execute this command:

SimpleGUI sg = new SimpleGUI (false);

Of course, you don't have to call the reference variable

"sg", like I did in this example. You can use any variable name you like. But for the rest of these hints, I will

assume the variable is called "sg".

For the command above to compile, you need to include an "import" statement at the top of your program (before "

public class ShapeDrawer

"), to tell Java

where to find the SimpleGUI code. Here's the command for that:

import simplegui.SimpleGUI;

To place shapes and text on the SimpleGUI window, you should execute commands by using

sg.();

For instance:

sg.drawDot(100, 200, 20);

This places a dot on the window with a position 100 pixels from the left, 200 pixels from the

top, and with a radius of 20 pixels. Notice that you have to put the "sg"

in front of the command name for it to work. For all of the commands in the SimpleGUI class, you will need to put "sg." in fr

ont of the command name (or whatever

the name of your Si

mpleGUI variable is).

To prompt the user for input, use the command

sg.print("your prompt here");

To read information from the keyboard, use one of these commands:

sg.keyReadDouble()

sg.keyReadString()

sg.keyReadChar()

import simplegui.SimpleGUI;

import java.awt.Color;

public class SimpleGUIExample

{

public static void main(String [] args)

{

SimpleGUI sg = new SimpleGUI(false);

sg.drawFilledBox(20, 20, 100, 200, Color.PINK, 1.0, "box1");

sg.drawFilledBox(40, 40, 120, 240, Color.YELLOW, 0.5, "box2");

sg.drawText("hello world", 35, 35);

sg.print("please enter a String");

String s = sg.keyReadString();

sg.drawText(s, 60, 60);

}

}

JAVA

Objective

This assignment will give you practice with static methods, parameters, and returns.

•

The goal of this project is to take existing Java code, and compress

it as much as possible by re-

organizing it into methods.

Your program:

Your program will consist of a single Java file, which you should call RefactoredShapeDrawer.java. (The word "refactored" is

a software engineering term for re-

organized code.) The program should work IDENTICALLY to

the attached

Java code for the

OriginalShapeDrawer

class, meaning that if the user enters the

same information into the

RefactoredShapeDrawer

and the

OriginalShapeDrawer

, the output should be identical.

The key requirement for the

RefactoredShapeDrawer

will be that it reorganizes the code into methods, to make the program shorter and easier to understand.

You should copy all of the code from

OriginalShapeDrawer

into

RefactoredShapeDrawer

(but make sure you change the line for the declaration of the class

name). You should then edit the code in

R

efactoredShapeDrawer

to reorganize it.

Here are the specific requirements for your program:

•

It must behave identically to the

OriginalShapeDrawer

. If it doesn't behave identically, you will lose between 5 and 10 points, depending on how different

your pr

ogram's output is from the original.

•

You should introduce a minimum of 4 new methods, not including the main method. Each method must be something that is used during

the execution of

the program.

•

At least two of your methods should have parameters that af

fect the behavior of the method.

•

At least two of your methods should have returns, and the return values must be used in some significant way by the code that calls the methods.

•

Your program should be clearly organized. Individual methods should have a cle

ar purpose, and it should be easy to see what the purpose is from their

name and/or comments describing the method. The behavior of the whole program should be clear from the sequence of method cal

ls in the main method.

Bonus:

Besides re-

organizing the code, an additional goal for the project is to reduce the overall length of the code.

The TA will

give the best “3” submissions (i.e.,

the

shortest code that meets all of the requirements

) 10 points extra.

Keep in mind that for t

his assignment, LENGTH = NUMBER OF SEMI

-COLONS (;) PLUS NUMBER OF ARITHMETIC OPERATORS (+, -

, *, /, %) IN YOUR CODE.

So comments don't count towards the length of the code (you should still put comments in your code!), method headers don't count (you shoul

d still add new methods

if they help organize the code!), and blank lines or lines that consist only of { or } don't count (so you should still inden

t your code in accordance with good style!).

Also, the class constants declared outside of any method wil

l not count towards the length of the program, so please keep those in. It's good programming practice

to use class constants instead of plain numbers in your program anyway.

Instructions:

•

Under

project

Lab09

you’ve created for Part 1, add a new Java main class

called

RefactoredShapeDrawer.java

•

Be sure to document your code

(add comments on top of your java file).

•

In the comments

add your name, date, course, homework number, and

statement of problem.

•

Once you are done, upload

RefactoredShapeDrawer.java

through Blackboard

under Lab 09 link

.

•

You do NOT need to email the

OriginalShapeDrawer

.java file

Explanation / Answer

import java.awt.Color; import simplegui.SimpleGUI; public class OriginalShapeDrawer { public static final int DEFAULT_SIZE = 100; public static final Color DEFAULT_COLOR = Color.BLACK; public static final int SPACE_BETWEEN = 10; public static void main(String [] args) { SimpleGUI sg = new SimpleGUI(false); sg.print("Please enter a background color"); String colorString = sg.keyReadString(); Color bgColor = DEFAULT_COLOR; if("white".equalsIgnoreCase(colorString)) { bgColor = Color.WHITE; } else if("red".equalsIgnoreCase(colorString)) { bgColor = Color.RED; } else if("orange".equalsIgnoreCase(colorString)) { bgColor = Color.ORANGE; } else if("yellow".equalsIgnoreCase(colorString)) { bgColor = Color.YELLOW; } else if("green".equalsIgnoreCase(colorString)) { bgColor = Color.GREEN; } else if("blue".equalsIgnoreCase(colorString)) { bgColor = Color.BLUE; } else if("gray".equalsIgnoreCase(colorString)) { bgColor = Color.GRAY; } else if("magenta".equalsIgnoreCase(colorString)) { bgColor = Color.MAGENTA; } else if("cyan".equalsIgnoreCase(colorString)) { bgColor = Color.CYAN; } else if("pink".equalsIgnoreCase(colorString)) { bgColor = Color.PINK; } else { sg.print("couldn't understand your color, so defaulting to black"); } sg.setBackgroundColor(bgColor); sg.print("Please enter a width"); double width = sg.keyReadDouble(); if(width < 0) { width = -width; } else if(width==0) { width = DEFAULT_SIZE; } sg.print("Please enter a length"); double length1 = sg.keyReadDouble(); if(length1 < 0) { length1 = -length1; } else if(length1==0) { length1 = DEFAULT_SIZE; } sg.print("Please enter a transparency"); double transparency1 = sg.keyReadDouble(); if(transparency1 < 0) { transparency1 = 0; } else if(transparency1 > 1) { transparency1 = 1; } sg.print("Please enter a color"); colorString = sg.keyReadString(); Color color1 = DEFAULT_COLOR; if("white".equalsIgnoreCase(colorString)) { color1 = Color.WHITE; } else if("red".equalsIgnoreCase(colorString)) { color1 = Color.RED; } else if("orange".equalsIgnoreCase(colorString)) { color1 = Color.ORANGE; } else if("yellow".equalsIgnoreCase(colorString)) { color1 = Color.YELLOW; } else if("green".equalsIgnoreCase(colorString)) { color1 = Color.GREEN; } else if("blue".equalsIgnoreCase(colorString)) { color1 = Color.BLUE; } else if("gray".equalsIgnoreCase(colorString)) { color1 = Color.GRAY; } else if("magenta".equalsIgnoreCase(colorString)) { color1 = Color.MAGENTA; } else if("cyan".equalsIgnoreCase(colorString)) { color1 = Color.CYAN; } else if("pink".equalsIgnoreCase(colorString)) { color1 = Color.PINK; } else { sg.print("couldn't understand your color, so defaulting to black"); } sg.drawFilledBox(0, 0, width, length1, color1, transparency1, null); sg.drawFilledBox(width+SPACE_BETWEEN, 0, width, length1, color1, transparency1 / 2.0, null); sg.drawFilledBox(2 * (width+SPACE_BETWEEN), 0, width, length1, color1, 1 - transparency1 / 2.0, null); sg.drawFilledBox(3 * (width+SPACE_BETWEEN), 0, width, length1, color1, transparency1 / 4.0, null); sg.drawFilledBox(4 * (width+SPACE_BETWEEN), 0, width, length1, color1, 1 - transparency1 / 4.0, null); sg.print("Please enter a length"); double length2 = sg.keyReadDouble(); if(length2 < 0) { length2 = -length2; } else if(length2==0) { length2 = DEFAULT_SIZE; } sg.print("Please enter a transparency"); double transparency2 = sg.keyReadDouble(); if(transparency2 < 0) { transparency2 = 0; } else if(transparency2 > 1) { transparency2 = 1; } sg.print("Please enter a color"); colorString = sg.keyReadString(); Color color2 = DEFAULT_COLOR; if("white".equalsIgnoreCase(colorString)) { color2 = Color.WHITE; } else if("red".equalsIgnoreCase(colorString)) { color2 = Color.RED; } else if("orange".equalsIgnoreCase(colorString)) { color2 = Color.ORANGE; } else if("yellow".equalsIgnoreCase(colorString)) { color2 = Color.YELLOW; } else if("green".equalsIgnoreCase(colorString)) { color2 = Color.GREEN; } else if("blue".equalsIgnoreCase(colorString)) { color2 = Color.BLUE; } else if("gray".equalsIgnoreCase(colorString)) { color2 = Color.GRAY; } else if("magenta".equalsIgnoreCase(colorString)) { color2 = Color.MAGENTA; } else if("cyan".equalsIgnoreCase(colorString)) { color2 = Color.CYAN; } else if("pink".equalsIgnoreCase(colorString)) { color2 = Color.PINK; } else { sg.print("couldn't understand your color, so defaulting to black"); } sg.drawFilledBox(0, length1 / 2.0, width, length2, color2, transparency2, null); sg.drawFilledBox(width+SPACE_BETWEEN, length1 / 2.0, width, length2, color2, transparency2 / 2.0, null); sg.drawFilledBox(2 * (width+SPACE_BETWEEN), length1 / 2.0, width, length2, color2, 1 - transparency2 / 2.0, null); sg.drawFilledBox(3 * (width+SPACE_BETWEEN), length1 / 2.0, width, length2, color2, transparency2 / 4.0, null); sg.drawFilledBox(4 * (width+SPACE_BETWEEN), length1 / 2.0, width, length2, color2, 1 - transparency2 / 4.0, null); sg.print("Please enter a length"); double length3 = sg.keyReadDouble(); if(length3 < 0) { length3 = -length3; } else if(length3==0) { length3 = DEFAULT_SIZE; } sg.print("Please enter a transparency"); double transparency3 = sg.keyReadDouble(); if(transparency3 < 0) { transparency3 = 0; } else if(transparency3 > 1) { transparency3 = 1; } sg.print("Please enter a color"); colorString = sg.keyReadString(); Color color3 = DEFAULT_COLOR; if("white".equalsIgnoreCase(colorString)) { color3 = Color.WHITE; } else if("red".equalsIgnoreCase(colorString)) { color3 = Color.RED; } else if("orange".equalsIgnoreCase(colorString)) { color3 = Color.ORANGE; } else if("yellow".equalsIgnoreCase(colorString)) { color3 = Color.YELLOW; } else if("green".equalsIgnoreCase(colorString)) { color3 = Color.GREEN; } else if("blue".equalsIgnoreCase(colorString)) { color3 = Color.BLUE; } else if("gray".equalsIgnoreCase(colorString)) { color3 = Color.GRAY; } else if("magenta".equalsIgnoreCase(colorString)) { color3 = Color.MAGENTA; } else if("cyan".equalsIgnoreCase(colorString)) { color3 = Color.CYAN; } else if("pink".equalsIgnoreCase(colorString)) { color3 = Color.PINK; } else { sg.print("couldn't understand your color, so defaulting to black"); } sg.drawFilledBox(0, (length1 + length2 / 2.0) / 2.0, width, length3, color3, transparency3, null); sg.drawFilledBox(width+SPACE_BETWEEN, (length1 + length2 / 2.0) / 2.0, width, length3, color3, transparency3 / 2.0, null); sg.drawFilledBox(2 * (width+SPACE_BETWEEN), (length1 + length2 / 2.0) / 2.0, width, length3, color3, 1 - transparency3 / 2.0, null); sg.drawFilledBox(3 * (width+SPACE_BETWEEN), (length1 + length2 / 2.0) / 2.0, width, length3, color3, transparency3 / 4.0, null); sg.drawFilledBox(4 * (width+SPACE_BETWEEN), (length1 + length2 / 2.0) / 2.0, width, length3, color3, 1 - transparency3 / 4.0, null); } }

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