代做Java编程语言、代写data程序

日期：2023-09-21 10:59

159.235 2023 S02 — Assignment 2

This assignment covers the topics: coordinates, transformations, 3d modelling, and visible

surfaces.

Wireframe Data Viewer

Write a Java program that renders a 3 dimensional triangle wireframe surface data model

and allows one to rotate and scale the model so that it can be viewed from any direction.

This could be thought of as a simple CAD program.

Your application needs to be set up so that the figures rotate as the sliders are adjusting,

they uniformaly resize after clicking the appropriate button, and they get re-drawn when

toggling between anti-aliasing on/off.

Use the simple viewing model where the “eye” point is on the positive z-axis looking down

and the figures are drawn by orthographically projecting onto the xy-plane.

You will need to decide how to transform the vertex coordinates in the wireframe data for

the given rotations and scalings. You can then draw each triangle on the Graphics2D canvas

with the transformed vertex positions.

Your rendered wireframe figures should appear “solid”—the wireframe outlines should be

clearly visible. You need to implement some procedure to remove hidden surfaces. You

should at least implement the back face culling method. You should find that this will

remove most hidden surfaces—but not all of them. Top marks will be earned by those

programs that are able to remove all hidden surfaces.

A set of triangle mesh wireframe data files are provided on Stream. You program should work

smoothly with all of them. The cow and teapot figures will mainly be used to benchmark

your submission.

Note: you do not need to apply any lighting or shading to the surfaces—this will be dealt

with later on in the course.

Completing the assignment

A set of startup Java source files are on Stream that will function as skeleton code for

the assignment. Load these into a new IntelliJ project and start up Main.java—this is the

“controller” part of your project. This features a number of JPanels with slider and button

widgets. Familiarize yourself with the various components in the project folder.

To complete the assignment, provide implementations for the other components. When

doing so you will need to make small adjustments to Main.java—mostly in the event handler

method. Complete as follows:

1. The Wireframe.java file contains a class that holds all data for a given triangle mesh

figure. Decide what data needs to be stored there. Provide an implementation in

WireframeDataIO.java to read from a wireframe .dat file and create a new instance of

Wireframe

[2 marks]

2. Complete the implementation of the rotation matrix utilities in Transform3d.java. The

purpose of this utility is to be able to readily generate a full rotation matrix given

rotation angles in each of the 3 planes.

[2 marks]

3. Make appropriate modification to the Wireframe class so that these rotations, as well

as scaling, can be applied to the triangle mesh data.

[3 marks]

4. Provide an implementation in WireframeDrawer.java to draw the triangles on a JPanel

using the transformed vertex positions. This needs to happen directly in response to

adjusting the sliders and clicking the buttons.

[3 marks]

5. Provide an implementation of back face culling. You will need to decide the appropriate

places in your project to make the modifications.

[4 marks]

6. Further modify your project to implement the Painter’s Algorithm. Here you will need

to decide on a suitable approach for defining the “depth” of your triangles and how to

sort them.

[4 marks]

7. Implement the action following the anti-aliasing buttons, so that the lines will be

drawn with anti-aliasing either on or off. Decide how this will be actioned in the Main

controller.

[2 marks]

Due date: 2023 September 22, 11:55pm.

Please submit via the submission link on Stream.

Total 20 marks (20% of your final grade).

Coding hints

• To read and parse a text file (as in the wireframe data files), the JDK supplied

java.util.Scanner class is a useful utility. Create a Scanner object and use the .nextLine()

method to step through the file line-by-line. This method will give you a line in a file as

a String. Note: to use this utility, you will need to handle the FileNotFoundException.

• There are situations where you will need to split a String into sub-strings according to

some delimiter (e.g. space, tab, comma, . . . ). Use the java.util.StringTokenizer for

this.

• To convert a String to a numeric value, use Integer.parseInt() or Double.parseDouble().

• It is suggested that you draw each triangle using something like:

// xDraw and yDraw are s i z e 3 arrays g iv ing the t r i angle ver tex pos i t ions

Polygon aTriangle = new Polygon(xDraw, yDraw, 3);

// . . . ass ign values to aTriangle . . .

// The implementation d e t a il s w i l l depend upon how you have

// designed your program

g2.setColor(Color.gray);

g2.fill(aTriangle); // Colour in the t r i angle sur face

g2.setColor(Color.black);

g2.draw(aTriangle); // Draw the t r i angle ou tl ine

Note that xDraw and yDraw are integer arrays.