程序代写代做代考 Java javaFx # COMP1110 Lab 6

# COMP1110 Lab 6

## Before the Lab

* Complete week 7 of your personal journal, commit and push at least 5 minutes prior to the start of your lab.

* Make sure you’ve covered module [**X01**](https://cs.anu.edu.au/courses/comp1110/lectures/javafx/) (JavaFX)

## Purpose

In this lab you will write a more advanced JavaFX program.

**It is essential that you complete this lab and have a tutor mark it off during the lab**.

## JavaFX Shapes

1. **Create a new JavaFX class.**

In the Java package `comp1110.lab6` within your labs repo, create a new Java class, `Board`, which extends `javafx.Application`, that draws a 600×519 pixel window. Set the window title to “Board”.

2. **Draw a triangle**

Create an upright 200x200x200 equilateral triangle within the scene you made in step 1. Use the `Polygon` class. Make the vertices centered around (0,0), and afterward use `setLayoutX()` and `setLayoutY()` to recenter the triangle in the middle of your window. Set the fill color of the triangle to `LIGHTGREY`.


*Hint: Relative to the center of the triangle, the apex of the triangle should be at (0.0, -86.6), and the right and left corners of the base should be (100.0, 86.6) and (-100.0, 86.6), where 100 = 200/2 and 86.6 = sqrt((200*200)-(100*100))/2;*

3. **Create an inner class**

Create an inner class, `Triangle`, which extends `Polygon` and has a constructor with signature `Triangle(double x, double y, double side)`. This should create an upright equilateral triangle, centered at (`x`,` y`), with sides of length `side`.

Comment out the code you wrote in step 2 (that drew the triangle with Polygon), and replace it with the creation of a `Triangle`. Set the fill color of the new triangle to `LIGHTGREY`. Don’t forget to add your triangle to the root group.

4. **Fill the board with triangles**

Fill the board with a grid of triangles, storing each triangle in an ArrayList. You should fit exactly three rows (each 173.2 pixels apart), each row having five triangles (three upright and two inverted). You will need to use the setRotate() method to invert some of the triangles.

5. **Create a white border**

Reduce the size of each triangle to 196 pixels, while maintaining the spacing as if they were size 200. This should create the effect of a white border around each triangle.


6. **Finish up**

Commit your code, push it, close the relevant issue (#18), and show your work
to your tutor.

## Work on your group assignment

Use any spare time to work on your group assignment.