Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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Implement all the classes using Java
Note: This problem requires you to submit only one class: Ball.java.
Do NOT include "public static void main()" method inside all of these classes. Graders will be testing your classes, using the unit-testing framework JUnit 4.
A class called Ball is designed as shown in the class diagram.
The Ball class contains the following private instance variables:
- x, y and radius, which represent the ball's center (x, y) co-ordinates and the radius, respectively.
- xDelta (Δx) and yDelta (Δy), which represent the displacement (movement) per step, in the x and y direction respectively.
The Ball class contains the following public methods:
- A constructor which accepts x, y, radius, speed, and direction as arguments. For user friendliness, user specifies speed (in pixels per step) and direction (in degrees in the range of (-180°, 180°]). For the internal operations, the speed and direction are to be converted to (Δx, Δy) in the internal representation. Note that the y-axis of the Java graphics coordinate system is inverted, i.e., the origin (0, 0) is located at the top-left corner.
- Δx = d × cos(θ) Δy = -d × sin(θ)
Hint: You will find Math.cos() and Math.toRadians(direction) static methods usefull. Don't forget that "d" is a speed.
- Getter and setter for all the instance variables.
- A method move() which move the ball by one step. x += Δx y += Δy
- reflectHorizontal() which reflects the ball horizontally (i.e., hitting a vertical wall) Δx = -Δx Δy no changes
- reflectVertical() (the ball hits a horizontal wall).Δx no changes Δy = -Δy
- toString() which prints the message "Ball at (x, y) of velocity (Δx, Δy)".
Write and submit the Ball class.
Transcribed Image Text:Ax
d (speed)
O (direction)
Ay
User's Polar
Java Graphics
Co-ordinates system
Co-ordinates
![Ball
-x:float
-y:float
-radius:int
Each move step advances x and y
by Ax and Ay. Ax and Ay could be
positive or negative.
|-xDelta:float
-yDelta:float
+Ball(x:float,y:float,radius:int
speed:int, direction:int)
+getX():float
+setX(x:float):void
+getY():float
+setY(y:float):void
+getRadius ():int
+setRadius (radius:int):void
+getXDelta():float
+setXDelta(xDelta:float):void
+getYDelta():float
+setYDelta(yDelta:float):void
+move ():void•-
+reflectHorizontal():voide
+reflectVertical():void•
+toString():String
Move one step:
х +3 Дх; у +3D Ду;
Ax = -Ax
Ay = -Ay
"Ball[(x,y),speed%-D(Ax,Ay)]"](https://content.bartleby.com/qna-images/question/f3dad014-c6bb-4735-812f-053559c6a885/8d80b90b-1361-49cd-81b0-9d65b1ebc209/jpq118q_processed.png)
Transcribed Image Text:Ball
-x:float
-y:float
-radius:int
Each move step advances x and y
by Ax and Ay. Ax and Ay could be
positive or negative.
|-xDelta:float
-yDelta:float
+Ball(x:float,y:float,radius:int
speed:int, direction:int)
+getX():float
+setX(x:float):void
+getY():float
+setY(y:float):void
+getRadius ():int
+setRadius (radius:int):void
+getXDelta():float
+setXDelta(xDelta:float):void
+getYDelta():float
+setYDelta(yDelta:float):void
+move ():void•-
+reflectHorizontal():voide
+reflectVertical():void•
+toString():String
Move one step:
х +3 Дх; у +3D Ду;
Ax = -Ax
Ay = -Ay
"Ball[(x,y),speed%-D(Ax,Ay)]"
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