Posts Tagged “demos”

Demos an application

• 2D Metaballs Demo using Marching Squares 04 April 2022
  • algorithms
  • computer-graphics
  • demos
  • javascript

  Metaballs are organic looking blob like balls that merge and split apart based on their distances from each other. They can be defined as a single function or a summation of functions across the x and y plane. By computing the contours, a very cool picture can be produced in real time as shown below. However, computing the entirety of the function plane to a high degree of precision is very expensive. To make it less expensive and produce a good high quality contour marching squares can be used. It samples 4 points of a function and interpolates where a threshold value occurs to draw the outline. I was inspired by Reducible’s video on how computers can draw weird shapes.

• Interactive Encryption and Decryption using RSA 14 March 2022
  • cryptography
  • ctf
  • demos
  • interactive
  • tool

  I had a bit of inspiration recently with Fermat’s Attack on RSA and decided to make an RSA demonstrator. It shows all the steps in performing an RSA encryption using 2 known primes. It might be useful during a CTF when trying to determine small RSA keys by hand. I’ll eventually post a follow up for implementing that attack for small p and q.

• Interactive Breadth First Search in a Grid 20 December 2020
  • app
  • breadth-first
  • data-visualization
  • demos
  • graph-search
  • graphs
  • interactive
  • programming

  Breadth first search(BFS) is a very powerful and useful algorithm for exploring graph like structures. A BFS searches it’s nearest neighbors first before moving on. It’s main use is to find a path using the fewest hops. Here we use it to explore a grid that can be modified by a user. In this grid, we have verticies (the grid boxes), and edges (the box north, south, east and west).

• Lights Out Game 29 July 2020
  • demos
  • games
  • interactive
  • programming
  • projects
  • puzzle-games

  Shown below is a lights out kind of game. Scores are not tracked or anything it’s just something meant for fun. The goal is to get the board either completely lit up or completely black. It inverts the color of whatever you click on and those directly adjacent squares. Those squares directly to the north, south, east and west.

• Sine-Cosine Demo App 06 September 2016
  • demos
  • programming

  I had to create a sine-cosine demonstrator for a class, this is that demo.