(15 points)
In this assignment, you will practice doing the following:
Overview
The goal of this assignment is to display repetitive graphics patterns in a window.
The display part is complete and is in the class ViewWindow (The code in ViewWindow is beyond the scope of this course. You don't need to understand what it does). The window features 3 radio buttons to display 3 different patterns. It also has a command button to change the colors of the pattern which is displayed. By right clicking on a pattern, the user gets the color at the location of the click (in a popup window).
The patterns are created in the class GraphicsElements, which the class that you need to complete. The class has three methods to create three patterns: the top view of a pile of disks, a checkered board and a Sierpinski triangle (see below for more explanations). The class Graphics elements contains also other methods to modify the colors of these patterns, or to inquire about a color at a given location within a pattern.
Some details
The pile of disks
It is created in the method
public ArrayList createAPileOfDisks()
The pile should appear as the top view of a pile of disks. The number of disks can be anywhere between 1 and NUMBER_OF_DISKS = 100. The number of disks is given by the user. To do the input, use a dialog box (method readIntDialog in uwcse.io.Input). If the user gives an invalid value, display an error message (use JOptionPane.showMessageDialog) and ask for the entry again.
The colors of the disks are randomly chosen. Make sure that the pile of disks is always as big as the window allows. Create the disks as Oval objects. Store these Ovals in an ArrayList (the larger disk at the beginning of the list) and return that list.
Below is an example
The method
public ArrayList rotateColorsInPileOfDisks(ArrayList graphicsList)
should change the colors of the disks in the pile, so that any disk gets the color of the disk on top of it. The top disk gets the color of the bottom disk. Modify the colors of the elements of the pile of disks (available in graphicsList) and return the updated ArrayList.
The method
public Color getColorInPileOfDisks(int x, int y, ArrayList graphicsList)
should return the color in the pile of disks (available in graphicsList) at location (x,y). If (x,y) is not in the pile of disks, the method should return null.
The checkered board
It is created in the method
public ArrayList createACheckeredBoard()
The board has the shape of a square. The number of rows (=number of columns) can be anywhere between 1 and NUMBER_OF_ROWS = 50. The number of rows is given by the user. To do the input, use a dialog box (method readIntDialog in uwcse.io.Input). If the user gives an invalid value, display an error message (use JOptionPane.showMessageDialog) and ask for the entry again.
Adjacent squares on the board should have different colors (use only two colors). Make sure that the board is always as big as the window allows. Create the individual squares of the board as Rectangle objects. Store these Rectangles in an ArrayList and return that list.
Below is an example
The method
public ArrayList flipColorsInCheckeredBoard(ArrayList graphicsList)
should change the colors of the squares on the board to the other available color. For example, if the board is made of blue and yellow squares, a blue square should become yellow and vice versa. Update the squares of the board (available in graphicsList) and return the updated ArrayList.
The method
public Color getColorInCheckeredBoard(int x, int y, ArrayList graphicsList)
should return the color on the checkered board (available in graphicsList) at location (x,y). If (x,y) is not on the board, the method should return null.
The Sierpinski triangle
It is created in the method
public ArrayList createASierpinskiTriangle ()
The triangle is created by selecting a number of points in the window. The number of points can be anywhere between 1 and NUMBER_OF_POINTS = 10000. The number of points is given by the user. To do the input, use a dialog box (method readIntDialog in uwcse.io.Input). If the user gives an invalid value, display an error message (use JOptionPane.showMessageDialog) and ask for the entry again.
The algorithm to create the triangle is the following.
Consider the three points, P1, P2 and P3 in the graphics window and a fourth point P (initially at the location of P1), as indicated in the drawing below
All of the Ovals should have the same color. When done finding all of the points, return the ArrayList
Below is an example (with 5000 points)
The method
public ArrayList changeColorsInSierpinskiTriangle (ArrayList graphicsList)
should change the colors of Sierpinski triangle. Switch between 3 colors (e.g. blue->red->green: if the triangle was blue, make it red, if it was red, make it green, if it was green make it blue). Update the circles of the triangle (available in graphicsList) and return the updated ArrayList.
The method
public Color getColorInSierpinskiTriangle (int x, int y, ArrayList graphicsList)
should return the color of the triangle (available in graphicsList) at location (x,y). If (x,y) is not part of the triangle, the method should return null.
What you need to do
Complete the class GraphicsElements. You need to provide exactly the interface listed in that class.
Sample code
As it is, the sample code doesn't compile. You will need to complete the GraphicsElements class (but you don't need to complete it all to try it. Just add some stub statements (e.g. return new ArrayList();) in the methods that need to return a value).
GraphicsElements.java, ViewWindow.java
Your program has to be your own.