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

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7
votes
2answers
403 views

Draw a simple cube

We don't have a single challenge about drawing a real 3 dimensional cube, so here it goes: Challenge Your task is to draw a rotated, cube with perspective. It can be in a separate window or as an ...
4
votes
4answers
447 views

Box-256 Assembly - BIG SQUARE II

I'd like to start a series of challenges for http://box-256.com/ starting with the first challenge, “BIG SQUARE II”. After this one I'll add another for "CHECKERBOARD" and so on. Rules: Complete ...
13
votes
3answers
857 views

Create a pie chart

The challenge is simple: Create a pie-chart based on a number of input values. The input will be a list of positive numbers, decimal or integers, and the output will be a pie-chart where each of the ...
11
votes
3answers
394 views

Draw a spiral in a box

This geometric spiral looks complicated, but it's fairly simple to draw; take the following box: Draw a straight line between the corner of the box and some set distance above the next corner ...
16
votes
2answers
470 views

Draw a random hexa-glyph

The above image is called a hexa-glyph. Hexa-glyphs are some cool patterns I made up while doodling during my DiffEq class. Here's how you make one: Consider the following set of points, shaped ...
11
votes
9answers
2k views

Invert png image

Create program or function that takes file name as an argument or reads it from standard input, and completes the following task: Read image from a png file (name given as argument). Reverse colors ...
-6
votes
4answers
173 views

Graph an equation!

Please note that this question is different from this question. This one asks for graphical output, while the other one asks for ascii art. Objective Help! Timmy's graphing calculator broke! His ...
21
votes
27answers
3k views

Draw the rainbow

The challenge is simple: Draw a rainbow in as few bytes as possible The specs for the rainbow are as follows: The figure must be exactly 400 pixels wide and 200 pixels high (optionally 401x201 if ...
3
votes
1answer
259 views

What time is it again? [closed]

The Inspiration The Challenge I'm tired of seeing the same old-same old clock in my top-right-hand corner of my screen. It's time for a new clock. While the clock clock sated my lack of interesting ...
12
votes
3answers
532 views

Fill the holes in letters

Sometimes when I'm bored, I take some text and fill the "holes" in the letters. But isn't filling the holes the most boring thing you can do? I think we should automate it, so we could use our time ...
29
votes
3answers
3k views

Dank Meme Generator

I like making dank memes out of my own images. But all those so called "quick meme" sites just have too much code. I realized that the only way to make the dankest meme generator is to ask you guys at ...
19
votes
26answers
3k views

Build a chessboard

Saw this in a PHP challenge. The objective is to make a chessboard with 64 squares (8*8) with the minimum amount of code. Simple enough, I made mine in PHP in 356 bytes (not impressive, I know) and I ...
73
votes
8answers
3k views

Patch the Image

In a popular image editing software there is a feature, that patches (The term used in image processing is inpainting as @mınxomaτ pointed out.) a selected area of an image, based on the information ...
178
votes
32answers
26k views

Paint Starry Night, objectively, in 1kB of code

Below is a 386x320 png representation of van Gogh's Starry Night. Your goal is to reproduce this image as closely as possible, in no more than 1024 bytes of code. For the purposes of this ...
21
votes
6answers
1k views

Triangular Ulam spiral

We've had a couple of challenges about the Ulam spiral. But that's not enough. In this challenge we will plot a triangular Ulam spiral (as opposed to the usual, square Ulam spiral). Here's a sketch ...
23
votes
6answers
2k views

Flip It, Flop It, Mean It

Overview Given an image in plain PPM (P3) format as input, for each pixel p in the image, replace each of the following 4 pixels' red, green, and blue with the floored average value of the respective ...
48
votes
7answers
1k views

Paint by Numbers (using programming, not numbers)

Your task is to create a program which takes a black-and-white outlined image (example images are below) and fills it in with colour. It is up to you how you section off each region and which colour ...
7
votes
1answer
217 views

Make the pattern from composition notebooks [closed]

This challenge was xnor's idea, taken from Digital Trauma's challenge donation thread. Your challenge is to write a program that, as xnor put it, "procedurally generate[s] the splotchy ...
25
votes
6answers
537 views

Draw the Pentaflake

First of all ... I would like to wish everyone a Merry Christmas (sorry if I am a day late for your timezone). To celebrate the occasion, we are going to draw a snowflake. Because the year is 2015 ...
8
votes
0answers
312 views

…And Mexico will Pay for It!

Donald Trump is very impressed with the work of the people on this site. He saw how amazing of a job you did helping Ben Carson, so he even hired you to build his wall. He thinks you're terrific. Now ...
9
votes
3answers
428 views

Draw a Christmas Star / Stellated Dodecahedron

Paper stars are a big thing in my family at christmas, so I thought a virtual one would be cool. Below is an image of a regular dodecahedron (from https://en.wikipedia.org/wiki/Dodecahedron, ...
-2
votes
1answer
129 views

Creating a colour chart in PHP will all colours [duplicate]

Now, before we begin, this has already been done here. But!, there are no PHP answers. With that in mind, my CodeGolf is thus: create a program to show all the colours in the html CSS spectrum using ...
59
votes
2answers
845 views

Sprocket Science: Animating a Chain Drive System

The goal of this challenge is to produce an animation of a chain drive system, comprised of a set of sprocket gears connected together by a chain. General Requirements Your program will be given a ...
13
votes
18answers
1k views

Make the PPCG Logo

Come November 1, Programming Puzzles and Code Golf will graduate, so in the next 11 months, we'll want to save some memories from when we were ungraduated. Write a program that produces the PPCG ...
19
votes
1answer
435 views

Packing Circles

Take a look at this image. Specifically, at how the holes on the ends are arranged. (Image source) Notice how the pipes in this image are packed in a hexagonal pattern. It is known that in 2D, a ...
48
votes
3answers
2k views

Black and White Rainbows

Given an image that has only black and white pixels and an (x,y) location that's a white pixel, color the white pixels based on their minimal Manhattan distance from (x,y) in a path that only involves ...
14
votes
4answers
523 views

Make America(n Maps) Great Again

New Bonus! (See below) The cartography team of U.S. Republican presidential hopeful Ben Carson is having some trouble with their maps (image via Washington Post): The problem is they don't have ...
91
votes
70answers
14k views

Draw the national flag of France

There have been many other flag challenges posted but not one for the national flag of France. This week seems like an appropriate time. Produce this flag in the fewest bytes possible: The image ...
20
votes
1answer
547 views

The Death Of Low-Resolution Pixel Art (Or, Draw That Death)

This is an Irregular Webcomic! themed task.* Death is a rather extensive orginization, and, although Head Death has had no trouble telling his employees apart, certain other entities connected to ...
6
votes
1answer
319 views

Sobel edge detector

Your task is to write a program that takes an input image and run it through edge-detection to become an output image. The edge-detection works as follows (if unclear, see sobel edge detection): ...
21
votes
1answer
332 views

Plumbing Random Paths

Write a program or function that takes in three integers, a width w, a height h, and a step count s. You will be drawing a non-self-intersecting random walk s steps long on a 5*w by 5*h pixel image ...
33
votes
12answers
3k views

Sort the pixels

Your task is to create a program that will, given an input image, create an output image of the same size, where all pixels are ordered by hex value. Your program may: Sort the pixels from left to ...
15
votes
9answers
807 views

Proto space invaders (can you blit it?)

Proto space invaders This is a graphical output challenge where the task is to give the shortest code per language. Task Your code should allow the user to move the following alien around the ...
36
votes
40answers
6k views

A single pixel moving in a circular path

This is a graphical output challenge where the task is to give the shortest code per language. Task Your code should plot a single purple pixel (hex value #800080 or rgb(128, 0, 128)), moving ...
20
votes
8answers
819 views

Circular ​Blues

Write a program or function that takes in a positive integer N and recreates this pattern of circles scaled to fit an N×N pixel image: This image is a valid output example for N = 946. In ...
23
votes
5answers
1k views

Seamless conversion from square to hexagon

For many games played on a grid, hexagons are the Clearly Superior Choice™. Unfortunately, many free game art sites only have seamless tile sets for square maps. On a past project, I used some of ...
15
votes
3answers
398 views

Regular Polygrams

Given the number of vertices n ≥ 3 and the "step size" 1 ≤ m < n/2 (indicating the distance between two connected vertices), output a graphical representation of the corresponding regular ...
26
votes
11answers
2k views

Graph Florets of a Flower

Take a look at this chamomile flower: Pretty, isn't it? Well, what if I told you that this wasn't actually one flower? A lot of flowers (including sunflowers, chamomiles, daisies and others) ...
16
votes
0answers
368 views

Generating Picture Mazes

Challenge Write a program/function that accepts an "image" and outputs a picture maze formed from that image. Input Your program should accept two arguments: I, the image to form the maze from S, ...
5
votes
2answers
340 views

3-D Antiferromagnetism

A while ago, we had a challenge related to antiferromagnetism (AF) in two dimensions. Now, on a 2-d square lattice, antiferromagnetic is antiferromagnetic, and that is all there is to it. Moving to ...
8
votes
1answer
298 views

Animations with all colours

Last year, there was a very popular challenge to create an image containing every 24-bit RGB colour. My challenge is to create a smooth animation (24 frames/s say), where the colour of every pixel of ...
12
votes
15answers
2k views

Randomize points on a disc

I read about circles somewhere, and just now learned about discs (it's actually a pretty common concept) and thought about codegolf. Your task is to randomize a point/several points on a disc with ...
10
votes
1answer
296 views

Plot a hyperbolic plane tessellation

Make a plot (Poincare disk) of a tessellation on a hyperbolic plane, such as: The program takes four inputs: 1) How many edges/polygon (three in this example). 2) How many intersect at each ...
10
votes
8answers
668 views

Barcodegolf: Generate a number's UPC

Just about every store nowadays uses Universal Product Code (UPC) barcodes to simplify the checking out process. If the name doesn't mean anything to you, you will surely recognize what they look ...
8
votes
1answer
378 views

Golf Wars Episode I: The Phantom Lightsabers

Background theme Introduction Obi-Wan Kenobi, Qui-Gon Jinn and Darth Maul are about to fight! However, they've all forgotten to bring their respective lightsabers. Write a program or function ...
19
votes
4answers
1k views

Force an Average on an Image

Write a program that takes in a standard truecolor image and a single 24-bit RGB color (three numbers from 0 to 255). Modify the input image (or output a new image with the same dimensions) such that ...
0
votes
1answer
252 views

ASCII art compression

The following challenge is basically a simpler version of the one proposed by Dennis (Lossy ASCII art compression). I found the idea super interesting but a bit too convulted, and seeing as it didn't ...
80
votes
14answers
5k views

The Colors in Our Stars

Write a program that takes in a string or text file whose first line has the form width height and each subsequent line has the form x y intensity red green blue where: width and height may be ...
36
votes
5answers
2k views

MS Paint is underrated

MS Paint was always a great time waster, but it was shunned by most graphic designers. Perhaps people lost interest because of the jarring color palette, or because of limited undo levels. Regardless, ...
15
votes
30answers
2k views

Antiferromagnetic ordering

Antiferromagnetism is what IBM researchers used to jump from a 1 terabyte disk to a 100 terabyte disk in the same amount of atoms. In materials that exhibit antiferromagnetism, the magnetic moments ...