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_site | ||
.vagrant | ||
.vagrant | ||
.idea |
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--- | ||
layout: post | ||
title: Фрактал Мандельброта на canvas | ||
author: Alexey Nurgaliev | ||
section: experimental | ||
--- | ||
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<link rel="stylesheet" href="/css/mandelbrot.css"> | ||
<script src="/js/mandelbrot.js"></script> | ||
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<canvas id="drawingCanvas" width="400" height="400">Ваш браузер не поддерживает canvas :(</canvas> | ||
<br> | ||
<div class="fractal-params text-center"> | ||
<form class="form"> | ||
<fieldset> | ||
<legend>Параметры фрактала</legend> | ||
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<div id="errors" class="text-danger"></div> | ||
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<div class="input-group"> | ||
<span class="input-group-addon">K<sub>max</sub></span> | ||
<input type="text" id="kmax" class="form-control" value="100"> | ||
</div> | ||
<br> | ||
<div class="input-group"> | ||
<span class="input-group-addon">R<sub>min</sub></span> | ||
<input type="text" id="rmin" class="form-control" value="2"> | ||
</div> | ||
<br> | ||
<div class="input-group"> | ||
<span class="input-group-addon">Цвет</span> | ||
<input type="color" id="color" class="form-control" value="0000FF"> | ||
</div> | ||
<br> | ||
<button type="button" id="redraw" class="btn btn-primary">Перерисовать</button> | ||
<button type="button" id="resetForm" class="btn btn-default">Сброс параметров</button> | ||
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</fieldset> | ||
</form> | ||
</div> | ||
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canvas { | ||
border-style: solid; | ||
border-width: 2px; | ||
border-color: #eaeaea; | ||
margin: 10px auto 10px; | ||
display: block; | ||
} | ||
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.fractal-params { | ||
display: block; | ||
margin: 10px auto 10px auto; | ||
max-width: 400px; | ||
} |
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var x_min = -2; | ||
var x_max = 1; | ||
var y_min = -1.5; | ||
var y_max = 1.5; | ||
var k_max = 100; | ||
var r_min = 2; | ||
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var res_color_r = 0; | ||
var res_color_g = 0; | ||
var res_color_b = 255; | ||
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var canvas, context; | ||
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$(function() { | ||
canvas = document.getElementById('drawingCanvas'); | ||
context = canvas.getContext('2d'); | ||
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//bind events | ||
$('#redraw').click(fractalRedraw); | ||
$('#resetForm').click(resetParams); | ||
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drawMandelbrot(); | ||
}); | ||
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function drawMandelbrot() { | ||
var width = canvas.width; | ||
var height = canvas.height; | ||
var dx = (x_max - x_min) / width; | ||
var dy = (y_max - y_min) / height; | ||
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var imageData = context.createImageData(width, height); | ||
var pixelData = imageData.data; | ||
var currentPixel = 0; | ||
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for(var y = 0; y < height; y++) { | ||
for(var x = 0; x < width; x++) { | ||
var k = mandelbrotIteration(x_min + x * dx, y_min + y * dy); | ||
pixelData[currentPixel + 0] = res_color_r; | ||
pixelData[currentPixel + 1] = res_color_g; | ||
pixelData[currentPixel + 2] = res_color_b; | ||
pixelData[currentPixel + 3] = Math.round(255 * (k / k_max)); | ||
currentPixel += 4; | ||
} | ||
} | ||
context.putImageData(imageData, 0, 0); | ||
} | ||
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function mandelbrotIteration(cx, cy) { | ||
var r_sq = r_min * r_min; | ||
var xk = cx; | ||
var yk = cy; | ||
for(var i = 0; i < k_max; i++){ | ||
var x = (xk * xk) - (yk * yk) + cx; | ||
var y = 2 * xk * yk + cy; | ||
if(x * x + y * y > r_sq) { | ||
return i; | ||
} | ||
xk = x; | ||
yk = y; | ||
} | ||
return k_max; | ||
} | ||
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function resetParams() { | ||
$('#kmax').val(100); | ||
$('#rmin').val(2); | ||
$('#color').val('0000FF'); | ||
} | ||
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function fractalRedraw() { | ||
getParams(); | ||
drawMandelbrot(); | ||
} | ||
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function getParams() { | ||
//reset errors | ||
$('#errors').children().remove(); | ||
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//Kmax | ||
k_max = parseInt($('#kmax').val()); | ||
if(isNaN(k_max) || k_max <= 0) { | ||
$('<p>Неправильное значение K<sub>max</sub>. Используется значение по умодчанию (100).</p>').appendTo('#errors'); | ||
k_max = 100; | ||
} | ||
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//Rmin | ||
r_min = parseFloat($('#rmin').val()); | ||
if(isNaN(r_min) || r_min <= 0) { | ||
$('<p>Неправильное значение R<sub>min</sub>. Используется значение по умодчанию (2).</p>').appendTo('#errors'); | ||
r_min = 2; | ||
} | ||
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//color | ||
color = parseInt($('#color').val(), 16); | ||
if(isNaN(color) || color < 0 || color > 0xFFFFFF) { | ||
$('<p>Неправильное значение цвета. Используется значение по умодчанию (#0000FF).</p>').appendTo('#errors'); | ||
color = 0x0000FF; | ||
} | ||
res_color_b = color % 0x100; | ||
res_color_g = Math.floor((color % 0x10000) / 0x100); | ||
res_color_r = Math.floor((color / 0x10000)); | ||
} |