[SOLVED] 代写 Java javaFx junit graph software ⃝c Manfred Kerber Alexandros Evangelidis

⃝c Manfred Kerber Alexandros Evangelidis
School of Computer Science University of Birmingham 19 November 2019
Worksheet 5
MSc/ICY Software Workshop
Assessed Worksheet: 3% of the module mark (5% for the 20cr version).
Submission Deadline is Tuesday, 3 Dec 2019, at 12:00 noon via Canvas. Follow the submissions guidelines on Canvas. JavaDoc comments are mandatory.
Note that this worksheet will be assessed in a viva (oral presentation of your code to a tutor). Hence prepare for all exercises main methods to demonstrate your running code. The tutor may want to make modifications to the main method in order to see how the graphics will change. Furthermore note that WE will NOT provide JUnit tests for this worksheet. Still YOU should submit such tests for those parts of your programs that can be tested with JUnit tests.
Exercise 1: (Basic, 30%) Using the javafx.scene.shape.Polygon class, write a class Upload.java that displays an upload icon as shown below.
Fig. 1: Upload icon
Exercise 2: (Medium, 30%)
Write a minimal class Expenditure.java that represents an expenditure with the two field variables private String description and private int value. Write a constructor and the getters.
Note that you can sort an array of type Expenditure from biggest to smallest by the sort method from the Java API class java.util.Arrays as follows:
Arrays.sort(expenditures, (Expenditure exp1, Expenditure exp2) ->
exp2.getValue() – exp1.getValue());
Assume that a company uses an array of type Expenditure to represent all its expenditures. You have to write a class Waffle.java in order to represent expenditures as a Waffle chart. See, for instance, https://en.wikipedia.org/wiki/Pie_chart#Square_chart_/_Waffle_chart.
For an array of up to maximum elements, display all elements (biggest to smallest). For an array with more than maximum elements, display only the maximum-1 biggest ones (biggest to smallest) and accumulate the others summed up as an entry with the description “Other”. For instance, with maximum = 8; and expenditures as left below the waffle chart should look like right below (Fig. 2).
Expenditures expenditures =
new Expenditure[]
{new Expenditure(“Salaries”, 11000),
new Expenditure(“Paper”, 2000),
new Expenditure(“Rent”, 5000),
new Expenditure(
“Most popular books on Java etc.”,
10000),
new Expenditure(“Heating”, 3000),
new Expenditure(“Coffee/Tea”, 7000),
new Expenditure(“Biscuits”, 8000),
new Expenditure(“Travel”, 18000),
new Expenditure(“Electricity”, 1000),
new Expenditure(“Pencils”, 3000)
Fig. 2: Waffle chart
});

Exercise 3: (Advanced, 30%) Like in exercise 2, we want to represent expenditures, however, this time as a pie chart. Write a class Pie.java to represent all expenditures in a corresponding array of type Expenditure. Write a method public void start(Stage stage) throws Exception that displays the expenditures as a pie chart with the description placed next to the corresponding part of the pie chart. Take care that the description does not overlap with the pie chart itself.
Do not make use of the javafx.scence.shape.PieChart class, but only the two shapes javafx.scene.shape.Circle and javafx.scene.shape.Line. You need also javafx.scence.text.Text. For instance, with the values from Exercise 2 your pie chart should look like the figure on the left (Fig. 3). The right figure (Fig. 4) gives an example how the descriptive text should NOT look like.
Fig. 3: How the pie chart should look. Fig. 4: How the pie chart should NOT look.
Exercise 4: (Debugging, 10%)
Code provided on the assignments Canvas page as DisplayFunctionArea.java should display the area between a function and the x-axis. For instance, for a method call displayFunctionArea(x -> x*x*x – 8 * x * x, -2, 9, 500); the area should be displayed as below to the left (Fig. 5). However, the actual display is incorrect and is shown as below to the right (Fig. 6). The whole area is compressed in the left upper corner and the x-axis does not show. Summarize the problems with the code and provide a corrected version that displays the area and the x-axis appropriately.
Fig. 5: How the display should look in the example. Fig. 6: How the display actually looks.