During work on some project I needed to draw pixels on screen. I found some put-pixel function in JS, but code was quite big and clumsy - so I wonder, how small put-pixel function can be...
Challenge
Create the smallest put-pixel function.
We count size of whole program: initialization code (if needed), function and code necessary to draw the test case witch 11 pixels. If your language does not support functions, you can use what you have. Language must be capable of graphical output or drawing charts (saving files is not allowed).
The function (or program) should accept as input the following 6 independent integers pixel parameters (and other if needed):
xfrom 0 to at least 255 - horizontal positionyfrom 0 to at least 255 - vertical positionRfrom 0 to 255 - red color componentGfrom 0 to 255 - green color componentBfrom 0 to 255 - blue color componentAfrom 0 to 255 - alpha (if 0 then the pixel color is fully transparent, and we see old background pixel; if 255 then the pixel is completely opaque; for values 0<A<255 we calculate color in linear way, using the old and new pixel colors).
more parameters than above 6 is allowed and parameters can have any order. Number parameters can be strings and have base different than 10 or be coded in some way (if chosen language requires that).
Test case
On output you should draw following test-case with 11 pixels (I will use putPixel(x,y,R,G,B,A) as example to show case)
putPixel(126, 127, 255, 0, 0, 255) // Red
putPixel(127, 127, 0, 255, 0, 255) // Green
putPixel(128, 127, 0, 0, 255, 255) // Blue
putPixel(129, 127, 255, 0, 0, 255) // Red
putPixel(129, 127, 0, 255, 0, 127) // Dark Yellow (previous red + transparent green)
putPixel(126, 128, 0, 0, 0, 255) // Black
putPixel(127, 128, 255, 255, 255, 255) // White
putPixel(128, 128, 255, 0, 0, 255) // Red
putPixel(128, 128, 0, 0, 255, 127) // Dark pink (previous red + transparent blue)
putPixel(129, 128, 0, 255, 0, 255) // Blue
putPixel(129, 128, 0, 0, 255, 127) // Dark sea-blue (previous blue + transparent green)
We should see 8 pixel (but we paint 11pixel, but 3 of them are transparent paints on already colored pixels).
Leaderboard:
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var QUESTION_ID = 250776; // Obtain this from the url
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var COMMENT_FILTER = "!)Q2B_A2kjfAiU78X(md6BoYk";
var OVERRIDE_USER = 88163; // This should be the user ID of the challenge author.
/* App */
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function answersUrl(index) {
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getAnswers();
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var OVERRIDE_REG = /^Override\s*header:\s*/i;
function getAuthorName(a) {
return a.owner.display_name;
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function process() {
var valid = [];
answers.forEach(function(a) {
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a.comments.forEach(function(c) {
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user: getAuthorName(a),
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valid.forEach(function (a) {
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++place;
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var lang = langs[i];
language = language.replace("{{LANGUAGE}}", lang.lang)
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.replace("{{LINK}}", lang.link);
language = jQuery(language);
jQuery("#languages").append(language);
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}body {
text-align: left !important;
display: block !important;
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padding: 10px;
width: 290px;
float: left;
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table thead {
font-weight: bold;
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<div id="answer-list">
<h2>Leaderboard</h2>
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<tr><td>{{LANGUAGE}}</td><td>{{NAME}}</td><td>{{SIZE}}</td><td><a href="{{LINK}}">Link</a></td></tr>
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a=127,b=128,c=255and so on it can save a few bytes, but also I can save bytes by replacing some of the calls to theputPixelfunction with others that achieve the same image output with fewer calls in total... and I'm sure you didn't intend to allow that. So where is the line? \$\endgroup\$