hjeong16 / n-body

N-body

Hwi Ram Jeong CSC 144 : Software Architecture 3/24/2016

This project is for my CSC 144 : Software Architecture class
I started my project from the basic N-body simulation file(you can also find this file in this github)

Learn about a scientific computing application.
Learn about reading input using the StdIn library
printing formatted output using the StdOut library
Learn about plotting graphics using the StdDraw library
Learn about using the command line to redirect standard input to read from a file
Learn to build up complex results using a sequence of simple statements Use nested loops Use arrays

Background for this N-body simulation:
In 1687 Sir Isaac Newton formulated the principles governing the the motion of two particles under the influence of their mutual gravitational attraction in his famous Principia. However, Newton was unable to solve the problem for three particles. Indeed, in general, systems of three or more particles can only be solved numerically. Your challenge is to write a program to simulate the motion of N particles in the plane, mutually affected by gravitational forces, and animate the results. Such methods are widely used in cosmology, semiconductors, and fluid dynamics to study complex physical systems. Scientists also apply the same techniques to other pairwise interactions including Coulombic, Biot-Savart, and van der Waals.
For more information visit https://en.wikipedia.org/wiki/N-body_simulation

Changes I made from the basic N-body simulation
-Input format
The input format is a text file that contains the information for a particular universe. The basic input included the initial position, the initial velocity, and the mass. I added image input.
String image = inputStream.readString();
-Trails
For this function, i used ArrayList function. Also, I made the trace removed if the length is over certain number i set.
I added Math.Random to make the width of trail keep changing and getHSBColor to make the color keep changing randomly.
-Bouncing
I added bouncing function that if the objects hit the edges it bounces back.
if(x >= boundary && v.cartesian(0) > 0) { v.xBouncing();
-Background
i added the background picture by using stdDraw.picture
-JunitTest
I tested if the methods are working or not
-Javadoc
I created Javadoc file and explained each methods within