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jrag.js
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jrag.js
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/**
* Javascript Random Art Generator.
*
* Generates consistent randomart images on given hexadecimal input string. Note
* that only the first 10 characters from the string are used. The value is then
* used to seed the random number generator responsible for the random walk.
*
* @param id String Required
* The hexadecimal string whose randomart representation is needed
* @param parent_element_id String
* The DOM id of the element where the randomart canvas should be placed in
* @param width Integer Required
* The pixel width for the randomart to be generated
* @param height Integer Required
* The pixel height for the randomart to be generated
* @param scale Integer Optional Default 1
* Multiplier for the width and height of the randomart image
* @param mirror_x Boolean Optional Default true
* Should the randomart image be mirrored on its x-axis?
* @param mirror_y Boolean Optional Default true
* Should the randomart image be mirrored on its y-axis?
*
*/
function JRAG(params) {
if (typeof window.jrags == "undefined") {
window.jrags = {};
}
var parent_id = params.parent_element_id;
var width = params.width;
var height = params.height;
var hash = params.hash;
if (typeof params.mirror_x != "undefined") {
var mirror_x = params.mirror_x;
}
else {
var mirror_x = true;
}
if (typeof params.mirror_y != "undefined") {
var mirror_y = params.mirror_y;
}
else {
var mirror_y = true;
}
if (typeof params.scale != "undefined") {
var scale = params.scale;
}
else {
var scale = 1;
}
var seed = parseInt(hash.substring(0, 10), 16);
function random() {
var x = Math.sin(seed++) * 10000;
var tmp = x - Math.floor(x);
return Math.floor(tmp * (15 - 0) + 0);
}
var canvas = document.createElement('canvas');
canvas.id = 'jrag_' + new Date().getTime();
if (typeof params.parent_element_id != "undefined") {
var parent = document.getElementById(parent_id);
parent.appendChild(canvas);
}
canvas.width = width * scale;
canvas.height = height * scale;
var ctx = canvas.getContext('2d');
var coord = {
"x": Math.floor(width / 2),
"y": Math.floor(height / 2),
"fillstyle": "127,127,127"
};
ctx.fillStyle = "rgb(" + coord.fillstyle + ")";
var iter = width * height * 6;
for (var i = 0; i < iter; i++) {
ctx.fillStyle = "rgb(" + coord.fillstyle + ")";
var r = random().toString(16);
coord = alter(coord, r);
ctx.fillRect(coord.x * scale, coord.y * scale, 1 * scale, 1 * scale);
}
if (mirror_x) {
var input = ctx.getImageData(0,0,Math.floor(width*scale/2), height * scale);
var output = ctx.createImageData(Math.floor(width*scale/2), height * scale);
var w = input.width, h = input.height;
var inputData = input.data;
var outputData = output.data
// Flip horizontal
for (var y = 0; y < h; y++) {
for (var x = 0; x < w; x++) {
var i = (y * w + x) * 4;
var flip = (y * w + (w - x - 1)) * 4;
for (var c = 0; c < 4; c ++) {
outputData[i+c] = inputData[flip+c];
}
}
}
ctx.putImageData(output, Math.floor(width * scale / 2), 0);
}
if (mirror_y) {
var input = ctx.getImageData(0, 0, width * scale, Math.floor(height*scale/2));
var output = ctx.createImageData(width * scale, Math.floor(height*scale/2));
var w = input.width, h = input.height;
var inputData = input.data;
var outputData = output.data
// Flip vertical
for (var y = 0; y < h; y++) {
for (var x = 0; x < w; x++) {
var i = (y * w + x) * 4;
var flip = (((h - 1) * w) - (y * w) + x) * 4;
for (var c = 0; c < 4; c ++) {
outputData[i+c] = inputData[flip+c];
}
}
}
ctx.putImageData(output, 0, Math.floor(height * scale / 2));
}
window.jrags[canvas.id] = canvas;
return canvas;
/**
* Changes the coordinates or the colour based on the input and the internal
* state of the function.
*/
function alter(coord, action) {
if (typeof alter.counter == 'undefined' ) {
alter.counter = 1;
}
else {
alter.counter++;
}
if (alter.counter % 17 == 0) {
var c = coord.fillstyle.split(",");
var r = parseInt(c[0]);
var g = parseInt(c[1]);
var b = parseInt(c[2]);
var s = 128;
switch(action){
case "0":
r = r + s;
break;
case "1":
r = r - s;
break;
case "2":
g = g + s;
break;
case "3":
g = g - s;
break;
case "4":
b = b + s;
break;
case "5":
b = b - s;
break;
case "6":
r = r + s;
g = g - s;
break;
case "7":
r = r - s;
g = g + s;
break;
case "8":
g = g + s;
b = b - s;
break;
case "9":
g = g - s;
b = b + s;
break;
case "a":
r = r + s;
b = b - s;
break;
case "b":
r = r - s;
b = b + s;
break;
case "c":
case "d":
r = r + s;
g = b + s;
g = b + s;
break;
case "e":
case "f":
r = r - s;
g = b - s;
g = b - s;
break;
}
if (r < 0) {r = 0;}
if (g < 0) {g = 0;}
if (b < 0) {b = 0;}
if (r > 255) {r = 255;}
if (g > 255) {g = 255;}
if (b > 255) {b = 255;}
coord.fillstyle = [r, g, b].join(",");
}
else {
var s = 1;
var x = coord.x;
var y = coord.y;
switch(action) {
case "0":
case "1":
x=x+s;
break;
case "2":
case "3":
x=x-s;
break;
case "4":
case "5":
y=y+s;
break;
case "6":
case "7":
y=y-s;
break;
case "8":
case "9":
x=x+s;
y=y+s;
break;
case "a":
case "b":
x=x-s;
y=y-s;
break;
case "c":
case "d":
x=x+s;
y=y-s;
break;
case "e":
case "f":
x=x-s;
y=y+s;
break;
}
if (x < 0) {x = width + x;}
else if (x > width) {x = x - width;}
if (y < 0) {y = height + y;}
else if (y > height) {y = y - height;}
coord.x = x;
coord.y = y;
}
return coord;
}
}