This challenge involves drawing pictures on a screen or generating image files. For pure ASCII art contests, use [tag:ascii-art] instead. If participants can choose between graphics and ASCII art, use both tags. For images as input, use [tag:image-processing].

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23
votes
0answers
504 views

Animation of Code Golf

When I see code-golf entries that knock a few characters off, whittling down the code, I go look at the edit history for a side-by-side diff. See and learn :) This challenge is to make a program ...
7
votes
6answers
646 views

Curve Stitching

Curve stitching is the process of "stitching" together multiple straight lines in order to create a curve, like so: For an explanation of curve stitching, visit this website. We will be drawing ...
6
votes
3answers
275 views

Catenary Between Two Points (Hanging Chain)

This is one of several challenges left for the community by Calvin's Hobbies. The curve that an idealised hanging rope or chain makes is a catenary. Image by Bin im Garten, via Wikimedia Commons. ...
8
votes
2answers
341 views

Generate the outline of an island from a seed [closed]

The challenge is to draw the outline of an 'island', generated using a seed as input. Input (seed): string of 6 characters (exactly) allowing only lowercase letters (i.e. abcdefghijklmnopqrstuvwxyz) ...
5
votes
1answer
257 views

Produce a Simple Station Model

A station model is a diagram for recording the weather at a certain place and time. Challenge You must write the shortest code possible to graphically output a simplified (explained later) station ...
5
votes
5answers
319 views

Draw centered polygonal numbers

A centered polygonal number is able to be put into an arrangement of multiple concentric polygons, each with a side length of one more than the inner one. For example (image from linked page), the ...
12
votes
0answers
282 views

Life can be colorful! [duplicate]

Each cell in a life-like cellular automaton only needs one bit to represent it since it can only be alive or dead. That means there are only two colors; pretty boring. Normal images have 24 bits per ...
20
votes
3answers
932 views

Drawing Epicyclogons

An epicycloid is the curve a point on a circle makes as it rolls around another circle. A cyclogon is the shape a point on a regular polygon makes as it rolls across a plane. An epicyclogon is the ...
3
votes
1answer
380 views

Output an Animated Trigonometry Circle

I want you to write a program that outputs a trigonometry circle like the one below. I also want you to animate this circle, having the sine line move along the circumference with the other lines move ...
40
votes
5answers
2k views

Redraw an image with just one closed curve

Inspired by vi.sualize.us Goal The input is a grayscale image and the output is a black and white image. The output image consists of just one closed curve (loop) that is not allowed to intersect ...
2
votes
1answer
628 views

Create a program that output's itself as a series of punch cards

Create a program that output's itself as a series of punch cards: Rules: You can use any programming language. The output (i.e. punch cards) can be ASCII art. Each line of code must be able to be ...
20
votes
2answers
796 views

Reproduce an image using lines

Write a program that takes in a true-color RGB image I, the maximum number of lines to draw L, and the minimum m and maximum M length of each line. Output an image O that looks as much as possible ...
43
votes
8answers
4k views

Draw random black-and-white forest

Your task is to write program which will draw 800x600 black-and-white image with something resembling a forest. Like this (it is dithered photo): Rules You are disallowed to use any existing ...
8
votes
0answers
313 views

Create a popular penrose tiling [closed]

The recent question about Wang tiles has led me to think that creating Penrose tilings might be an interesting popularity contest. Background Wang tiles are tiles that can tile the plane, but only ...
1
vote
10answers
951 views

Crop an image to a square

In this challenge, you will take an input image and crop it to make a square, leaving only the central part of the input image. The answers must work with landscape, portrait, or square input images. ...
25
votes
10answers
4k views

Golf a Venn Diagram generator

Golf a Venn Diagram generator In order to properly celebrate John Venn's 180th birthday, today your task will be creating a program that outputs a Venn Diagram! Input: A positive integer N that ...
18
votes
2answers
2k views

Fill the Screen with Wang Tiles

It has been proven that the following 13 square Wang tiles always tile the plane aperiodically. This means that when the squares are arranged in a grid with all neighboring sides the same color, a ...
272
votes
56answers
68k views

Tweetable Mathematical Art

Integer math can generate amazing patterns when laid out over a grid. Even the most basic functions can yield stunningly elaborate designs! Your challenge Write 3 Tweetable (meaning 140 characters ...
1
vote
2answers
206 views

Collatz Graph Plotting

Write a program that outputs a graph of the collatz sequence any way you want (ASCII Image Video etc). You have to implement it that way that you can adjust the size of the graph by either the maximum ...
7
votes
1answer
322 views

The Mouse's Tale

Write a program that outputs Lewis Carroll's poem The Mouse's Tale from Alice in Wonderland, drawn in its distinctive tail-like shape. Plain text of the poem: Fury said to a mouse, That he met ...
17
votes
5answers
1k views

Draw an Image with a Snake

Imagine a continuous 2-dimensional path that can only turn left, right, or go straight, cannot intersect itself, and must fill a rectangular grid such as the grid of pixels in an image. We'll call ...
64
votes
11answers
7k views

Make a circle illusion animation

Your job is to animate this circle illusion. It looks like the points rotating inside of the circle, but they are actually just moving in straight lines. Criterias The result has to be animated. ...
5
votes
2answers
348 views

Courier Ception

Courier Ception The program must accept any string as input and output an pixel image that shows the input string in Courier. All the letters that contain a 'hole' (like abdegopqABDPQR etc) that is ...
25
votes
6answers
2k views

Photomosaics or: How Many Programmers Does it Take to Replace a Light Bulb?

I've compiled a mosaic of 2025 headshots from the avatars of the top Stack Overflow users. (Click the image to view it full-size.) Your task is to write an algorithm that will create an accurate ...
0
votes
1answer
347 views

Babylon.js - loop through a scene and apply a simple fragment shader to all of the objects

You have a library - a fully loaded 2014 Babylon.js. You have a fragment shader - let's call it sample.fragment.fx. You have a scene - loaded ahead of time, possibly from a .babylon JSON file. Your ...
275
votes
35answers
48k views

American Gothic in the palette of Mona Lisa: Rearrange the pixels

You are given two true color images, the Source and the Palette. They do not necessarily have the same dimensions but it is guaranteed that their areas are the same, i.e. they have the same number of ...
7
votes
1answer
400 views

Open source optical lattice clock

A recent question showed how Mathematica could be used to make a beautiful optical lattice clock image. The image looks like this. This challenge is to reproduce this image as closely as possible ...
10
votes
12answers
1k views

Spirograph Time!

A Spirograph is a toy that draws hypotrochoids and epitrochoids. For this challenge, we'll just focus on the hypotrochoids. From Wikipedia: A hypotrochoid is a roulette traced by a point ...
20
votes
45answers
5k views

Write a hello world GUI program that closes itself after three seconds

Please read the rules, and the bold areas as well. Write a program in any language, so long as it has GUI support for a window system (cannot be text-consoles, etc., and must be a ...
7
votes
2answers
562 views

Steampunk: Clacker animation

In the highly underrated Steampunk novel The Difference Engine, the equivalent of cinema houses delivered a pixelated moving image displayed by tiles which could be flipped mechanically. The control ...
10
votes
3answers
682 views

Output a solid PNG from scratch

Input: An RGBA hex color c (ex. FFFF00FF) and an integer > 0 and < 1000 n (ex. 200). Output: Raw bytes of a PNG file such that when the output is saved to a file and opened in an image viewer, an ...
54
votes
14answers
7k views

Draw the € sign

The goal is to output or display an image with an € (euro) sign according to the following specs (ignoring the border of the sign). Source: http://en.wikipedia.org/wiki/File:Euro_Construction.svg ...
23
votes
4answers
3k views

May the 4th be with you!

In honor of Star Wars day, write a program to display the following text, scrolling like the Star Wars opening crawl: It is a period of civil war. Rebel spaceships, striking from a hidden ...
3
votes
0answers
460 views

Collatz Attack!

This challenge is based on some new findings related to the Collatz conjecture and designed somewhat in the spirit of a collaborative polymath project. Solving the full conjecture is regarded as ...
15
votes
4answers
617 views

I like Pythagorean trees

...so this is a challenge to make me a tree. Produce a program or function called tree which takes a single integer argument, N and draws a Pythagorean Tree N levels deep, where level 0 is just the ...
9
votes
3answers
725 views

building circuit for divisibility by 3

A boolean circuit in TCS is basically a DAG consisting of And, Or, Not gates, and by what is known is "functional completeness" they can compute all possible functions. eg this is the basic principle ...
10
votes
2answers
716 views

Make a word cloud from a text

The code should take text from standard input: The definition of insanity is quoting the same phrase again and again and not expect despair. The output should be a PNG file containing the word ...
56
votes
8answers
6k views

Is it dark outside? Draw a sun map!

Our closest star, the sun, is quite fidgety. The times it rises and sets depend on where you are, and whether it is winter or not. We would like to be able to deduce if the sun is shining outside ...
13
votes
2answers
629 views

What do you see in an inkspot? Rorschach generation'

So I'd like you to attempt to generate Rorschach images like the below image: Here is a link to further inspiration. This is a popularity contest, but I will say that colours are likely to be more ...
6
votes
1answer
514 views

Create a random 3D asteroid

Imagine you are working on a 3D adaptation of the classical video game Asteroids. Your task is to write an algorithm that can create a random 3D asteroid. This is a popularity contest, not code golf. ...
52
votes
27answers
7k views

Mandelbrot image in every language

I always used a Mandelbrot image as the 'graphical' version of Hello World in any graphical application I got my hands on. Now it's your guys' turn. Language must be capable of graphical output or ...
25
votes
17answers
3k views

Output an image of your source code (not-quite-a-Quine)

Code golf: Print an image of the source code. Requirements Must output the image of the source code itself, not a version stored elsewhere and retrieved at run time. Code must be legible enough ...
8
votes
15answers
1k views

Approximate a Bell Curve

Create a program to display some approximation of a bell curve. You are free to use whatever method you wish for generating the data, but the data must be displayed vertically, as in oriented like so: ...
16
votes
6answers
1k views

Paralell projected voxel terrain generator

Your job is to generate a heightmap and show it as a paralell projected, voxel landscape. The rules are the following: The (heightmap of the) landscape has to be randomly generated You also have to ...
230
votes
40answers
58k views

Images with all colors

Similar to the images on allrgb.com, Make images where each pixel is a unique color (no color is used twice and no color is missing). Give a program that generates such an image, along with a ...
32
votes
7answers
2k views

Animated drawing of a Bézier curve

Your job is to draw a Bézier curve given it's control points. The only criteria is that you actually have to show how to draw the curve from the initial control point to the last one. Criterias The ...
20
votes
8answers
2k views

Cubify This! A lesson in grayscale… er… color… er… whatever

Being a big fan of the Rubik's cube and of cool art, I've been working on combining the two together to do some really cool stuff. Basically solving miniature Rubik's cubes to form rudimentary pixels ...
0
votes
1answer
202 views

Plot gif of 3 dimensional heart in R [closed]

inspired by this blog: http://alstatr.blogspot.co.uk/2014/02/r-animating-2d-and-3d-plots.html I made a 2D gif of a heart with: library(animation) saveGIF({ for(i in 1:150){ dat<- ...
11
votes
14answers
1k views

Create an analogue clock

Create an analogue clock Goal: To create a working analogue clock using any programming language. Requirements: Your clock should feature at least the hour and minute pointers. The produced clock ...
-4
votes
2answers
557 views

Make “The day we fight back” Logo [closed]

Seeing that Feb. 11, 2014 is being celebrated as "The day we fight back", your code-challenge is to make a Day we fight back Logo, similar to the once shown below, in the language of your choice. ...