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Удалова #9

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208 changes: 208 additions & 0 deletions Fractal.js
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let Scale = 0;
let Field = {
left: 0,
top: 0,
right: 0,
bottom: 0
};

function mousePress() {
canvas.addEventListener("mousedown",
function (e) {
reScale(canvas, e);
},
false);
}

function reScale(canvas, e) {
let mouseCoords = canvas.relMouseCoords(e);
let x = mouseCoords.x * (Field.right - Field.left) / (canvas.width - 1) + Field.left;
let y = mouseCoords.y * (Field.bottom - Field.top) / (canvas.height - 1) + Field.top;
if (e.button === 0) {
Scale /= 1.5;
}
if (e.button === 2) {
Scale *= 1.5;
}
run(x, y);
}

function resetScale() {
Scale = 2;
}

function run(centerX, centerY) {
let fractalType = Choose.ChooseFractal.options[Choose.ChooseFractal.selectedIndex].value;
let colorType = Choose.ChooseColor.options[Choose.ChooseColor.selectedIndex].value;
Field.left = centerX - Scale;
Field.top = centerY - Scale;
Field.right = centerX + Scale;
Field.bottom = centerY + Scale;
let n = parseInt(document.getElementById('n').value);
draw(n, fractalType, colorType);
}

function draw(n, fractalType, colorType) {
let canvas = document.getElementById("canvas");
let context = canvas.getContext('2d');
let imageData = context.getImageData(0, 0, canvas.width, canvas.height);
let width = canvas.width;
let height = canvas.height;
for (let x = 0; x < width; x++) {
for (let y = 0; y < height; y++) {
let i = x * (Field.right - Field.left) / (width - 1) + Field.left;
let j = y * (Field.bottom - Field.top) / (height - 1) + Field.top;
let pointData = choseFractal(i, j, n, fractalType);
let color = choseColor(pointData, n, fractalType, colorType);
putColor(x, y, color, width, imageData);
}
}
context.putImageData(imageData, 0, 0);
}

function choseFractal(x, y, n, fractalType) {
switch (fractalType) {
case 'newtonPool':
return getNewtonAttractor(x, y, n, 0);
case 'mandelbrotSet':
return getMandelbrotAttractor(x, y, n);
case 'juliaSet':
let re = parseFloat(document.getElementById('re').value);
let im = parseFloat(document.getElementById('im').value);
return getJuliaAttractor(x, y, re, im, n);
}
}

function getNewtonAttractor(x, y, n, itter) {
let cos = Math.cos(Math.PI / 3);
let sin = Math.sin(Math.PI / 3);

if (n === 0)
return {
attr: 0,
i: itter
};
if (isCloseToAttr(x, y, 1, 0))
return {
attr: 1,
i: itter
};
if (isCloseToAttr(x, y, -cos, sin))
return {
attr: 2,
i: itter
};
if (isCloseToAttr(x, y, -cos, -sin))
return {
attr: 3,
i: itter
};
let x2 = x * x;
let y2 = y * y;
let x1 = 2 / 3 * x + (x2 - y2) / (3 * (x2 + y2) * (x2 + y2));
let y1 = 2 / 3 * y * (1 - x / ((x2 + y2) * (x2 + y2)));
return getNewtonAttractor(x1, y1, n - 1, itter + 1);
}

function isCloseToAttr(x1, y1, x2, y2) {
return Math.abs(x2 - x1) <= 0.0001 && Math.abs(y2 - y1) <= 0.0001;
}

function getMandelbrotAttractor(x, y, n) {
let x0 = 0;
let y0 = 0;
let x1 = 0;
let y1 = 0;
let k = 0;
while (k < n) {
x1 = x0 * x0 - y0 * y0 + x;
y1 = 2 * x0 * y0 + y;
if (x1 * x1 + y1 * y1 > 4)
return {
i: k
};
x0 = x1;
y0 = y1;
k++;
}
return {
i: 0
};
}

function getJuliaAttractor(x, y, re, im, n) {
let x0 = x;
let y0 = y;
let x1 = 0;
let y1 = 0;
let k = 0;
while (k < n) {
if (x0 * x0 + y0 * y0 > 4)
return {
i: k
};
x1 = x0 * x0 - y0 * y0 + re;
y1 = 2 * x0 * y0 + im;
x0 = x1;
y0 = y1;
k++;
}
return {
i: 0
};
}

function choseColor(pointData, n, fractalType, colorType) {
switch (colorType) {
case 'classicPaint':
return paintClassic(pointData, fractalType);
case 'levelPaint':
return paintLevels(n, pointData.i);
case 'zebraPaint':
return paintZebra(pointData.i);
case 'newtonHybridPaint':
return paintNewtonHybrid(pointData.attr, pointData.i, n)
}
}

function paintClassic(point, fractalType) {
if (fractalType === "newtonPool") {
switch (point.attr) {
case 0:
return [0, 0, 0, 0];
case 1:
return [255, 0, 0, 255];
case 2:
return [0, 255, 0, 255];
case 3:
return [0, 0, 255, 255];
}
} else return point.i === 0 ? [0, 0, 0, 255] : [255, 255, 255, 255];
}

function paintLevels(n, itter) {
let brightness = n > 1 ? 255 * itter * 4 / (n - 1) : 255;
return [brightness, brightness, brightness, 255];
}

function paintZebra(itter) {
let color;
itter % 2 === 0 ? color = [0, 0, 0, 255] : color = [255, 255, 255, 255];
return color;
}

function paintNewtonHybrid(attr, k, n) {
let point = [0, 0, 0, 255];
if (attr == 1) point[0] = n > 1 ? 255 * k / (n - 1) : 255;
if (attr == 2) point[1] = n > 1 ? 255 * k / (n - 1) : 255;
if (attr == 3) point[2] = n > 1 ? 255 * k / (n - 1) : 255;
return point;
}

function putColor(x, y, color, width, imageData) {
let index = (x + y * width) * 4;
imageData.data[index + 0] = color[0];
imageData.data[index + 1] = color[1];
imageData.data[index + 2] = color[2];
imageData.data[index + 3] = color[3];
}
157 changes: 78 additions & 79 deletions index.html
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Original file line number Diff line number Diff line change
@@ -1,80 +1,79 @@
<!doctype html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta http-equiv="Cache-Control" content="no-cache"/>

<script>
HTMLCanvasElement.prototype.relMouseCoords = function (event) {
var totalOffsetX = 0;
var totalOffsetY = 0;
var canvasX = 0;
var canvasY = 0;
var currentElement = this;

do {
totalOffsetX += currentElement.offsetLeft;
totalOffsetY += currentElement.offsetTop;
}
while (currentElement = currentElement.offsetParent)

canvasX = event.pageX - totalOffsetX;
canvasY = event.pageY - totalOffsetY;

// Fix for variable canvas width
canvasX = Math.round( canvasX * (this.width / this.offsetWidth) );
canvasY = Math.round( canvasY * (this.height / this.offsetHeight) );

return {x:canvasX, y:canvasY}
}

//пример рисования произвольного множества точек
function example(canvas) {
var canvasHeight = parseInt(canvas.getAttribute("height"));
var canvasWidth = parseInt(canvas.getAttribute("width"));

//создаем 2d context
var context = canvas.getContext('2d');

//создаем "буфер" imageData, в который будем класть новую информацию о цветах
var imageData = context.createImageData(canvasWidth, canvasHeight);
for (var i = 0; i < canvasWidth; i++) {
for (var j = 0; j < canvasHeight; j++) {
var red = 0;
var green = 0;
var blue = (i + j) % 255;
if (i % 20 == 0)
red = 150;
if (j % 20 == 0)
green = 150;
var opacity = 255;

imageData.data[4*(i + canvasWidth*j) + 0] = red;
imageData.data[4*(i + canvasWidth*j) + 1] = green;
imageData.data[4*(i + canvasWidth*j) + 2] = blue;
imageData.data[4*(i + canvasWidth*j) + 3] = opacity;
}
}
//заполненный "буфер" imageData передаем в context для вывода на экран
context.putImageData(imageData, 0, 0);
}

function mouseDownHandler(canvas, e) {
var coords = canvas.relMouseCoords(e);
alert("x=" + coords.x + " " + "y=" + coords.y);
}

//вызывается после загрузки body
function run () {
var canvas = document.getElementById("canvas");
canvas.addEventListener("mousedown",
function(e) { mouseDownHandler(canvas, e); },
false);
example(canvas);
}
</script>

<body onload="run()">
<canvas height='200' width='200' id='canvas'></canvas>
</body>
<!doctype html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<meta http-equiv="Cache-Control" content="no-cache"/>
<script src="Fractal.js" type="text/javascript" charset="utf-8"></script>
<script>
HTMLCanvasElement.prototype.relMouseCoords = function (event) {
var moveX = 0;
var moveY = 0;
var canvasX = 0;
var canvasY = 0;
var currentElement = this;
do {
moveX += currentElement.offsetLeft;
moveY += currentElement.offsetTop;
}
while (currentElement = currentElement.offsetParent)
canvasX = event.pageX - moveX;
canvasY = event.pageY - moveY;
canvasX = Math.round(canvasX * (this.width / this.offsetWidth));
canvasY = Math.round(canvasY * (this.height / this.offsetHeight));
return {
x: canvasX,
y: canvasY
}
}
</script>
</head>
<form name="Choose">
<body onload="mousePress();">
<table>
<tr>
<td>Тип фрактала:</td>
</tr>
<tr>
<td>
<select name="ChooseFractal">
<option value='newtonPool'>Бассейн Ньютона</option>
<option value='mandelbrotSet'>Множество Мандельброта</option>
<option value='juliaSet'>Множество Жюлиа</option>
</select>
</td>
</tr>
<tr>
<td>Тип расскраски:</td>
</tr>
<tr>
<td>
<select name="ChooseColor">
<option value='classicPaint'>Классический</option>
<option value='levelPaint'>Уровни</option>
<option value='zebraPaint'>Зебра</option>
<option value='newtonHybridPaint'>Гибриная</option>
</select>
</td>
</tr>
<tr>
<td>Характеризующее множество Жюлиа значение C:</td>
</tr>
<tr>
<td>
Re:<input type="number" id="re" name="re" value="-0.12">
Im: <input type="number" id="im" name="im" value="0.74">
</td>
</tr>
<tr>
<td colspan="2">Максимальная итерация <input type="number" id="n" name="n" value="150"></td>
</tr>
<tr>
<td>
<button type="button" onclick="resetScale(); run(0, 0)">Нарисовать</button>
</td>
</tr>
</table>
<canvas height='500' width='500' id='canvas' oncontextmenu="return false;"></canvas>
</body>
</form>
</html>