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Румянцев #4

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0d501ad
start
RDaniil May 26, 2017
9989023
fractals done
RDaniil May 26, 2017
0acb6e8
done
RDaniil May 27, 2017
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319 changes: 319 additions & 0 deletions algFract.js
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Original file line number Diff line number Diff line change
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class Neighbourhood {
constructor(x, y, color) {
this.x = x;
this.y = y;
this.eps = EPSILON;
this.color = color;
}
contain(x, y) {
return Math.abs(x - this.x) <= this.eps && Math.abs(y - this.y) <= this.eps;
}
}

var Colors = {
Red: [240, 60, 50],
Green: [100, 240, 60],
Blue: [60, 100, 240],
White: [255, 255, 255],
Black: [0, 0, 0]
};

function getColor(actualIterations, attractor) {
switch (coloringType) {
case "Classic":
if (fractalType === "Newton Fractal") {
return attractor.color;
}
return actualIterations === 0 ? Colors.Black : Colors.White;
case "Zebra":
return actualIterations % 2 === 0 ? Colors.Black : Colors.White;
case "Rainbow":
var c = HSVtoRGB(maxIterations / actualIterations, 1,
maxIterations / actualIterations % 0.8);
var color = [c.r, c.g, c.b];
return color;
case "Levels":
var brightness = maxIterations > 1 ?
255 * actualIterations / (maxIterations - 1) : 0;
var color = [];
for (var i = 0; i < 3; i++) {
color[i] = brightness
}
return color;
default:
return actualIterations === 0 ? Colors.Black : Colors.White;
}
}

class JuliaSet {
getPointColor(i, j) {
var i0 = i;
var j0 = j;
var i1 = 0;
var j1 = 0;
var k = 0;
while (k < maxIterations) {
if (i0 * i0 + j0 * j0 > 4)
return getColor(k);
i1 = i0 * i0 - j0 * j0 + re;
j1 = 2 * i0 * j0 + im;
i0 = i1;
j0 = j1;
k++;
}
return getColor(0);
}
}

class MandelbrotSet {
getPointColor(x, y) {
var i0 = 0;
var j0 = 0;
var i1 = 0;
var j1 = 0;
var k = 0;
while (k < maxIterations) {
i1 = i0 * i0 - j0 * j0 + x;
j1 = 2 * i0 * j0 + y;
if (i1 * i1 + j1 * j1 > 4)
return getColor(k);
i0 = i1;
j0 = j1;
k++;
}
return getColor(0);
}
}

class NewtonFractal {
constructor() {
this.attractors = [
new Neighbourhood(1, 0, Colors.Red),
new Neighbourhood(-Math.cos(Math.PI / 3), Math.sin(Math.PI / 3), Colors.Blue),
new Neighbourhood(-Math.cos(Math.PI / 3), -Math.sin(Math.PI / 3), Colors.Green)
];
}

nextPoint(p) {
var x = p.x;
var y = p.y;

return {
x: 2 / 3 * x + 1 / 3 * (x * x - y * y) / Math.pow(x * x + y * y, 2),
y: 2 / 3 * y * (1 - x / Math.pow(x * x + y * y, 2))
};
}

getPointColor(x, y) {
var point = { x: x, y: y };
for (var i = 0; i < maxIterations; i++) {
for (var j = 0; j < this.attractors.length; j++) {
if (this.attractors[j].contain(point.x, point.y)) {
return getColor(i, this.attractors[j]);
}
}
point = this.nextPoint(point);
}
return Colors.White;
}
}

const defaultBorder = 2;
var fractalBorder = {
top: -defaultBorder,
bottom: defaultBorder,
left: -defaultBorder,
right: defaultBorder
}

function resetBorder() {
fractalBorder.top = -defaultBorder;
fractalBorder.bottom = defaultBorder;
fractalBorder.left = -defaultBorder;
fractalBorder.right = defaultBorder;
}

function getRealCoordinate(i, j) {
return {
x: fractalBorder.left + i * (fractalBorder.right - fractalBorder.left) / (width - 1),
y: fractalBorder.top + j * (fractalBorder.bottom - fractalBorder.top) / (height - 1)
};
}

const EPSILON = 0.001;
var im;
var re;

var NewtonFract = new NewtonFractal();
var Mandelbrot = new MandelbrotSet();
var Julia = new JuliaSet();

var fractalSelect;
var fractalType;
var coloringSelect;
var iteraionsSlider;
var maxIterations;
var screenshotButton;
var drawButton;
var reSlider;
var imSider;

function setup() {
createCanvas(600, 600);
pixelDensity(1);
setGUI();
drawFractal();
}

function coloringSelectEvent() {
coloringType = coloringSelect.value();
drawFractal();
}

function fractalTypeSelectEvent() {
fractalType = fractalSelect.value();
resetBorder();
drawFractal();
}

function resetViewAndDraw() {
resetBorder();
drawFractal();
}

function drawFractal() {
loadPixels();
maxIterations = iteraionsSlider.value();
re = reSlider.value();
im = imSlider.value();

for (var x = 0; x < width; x++) {
for (var y = 0; y < height; y++) {
var coord = getRealCoordinate(x, y);
var color = getFractalPointColor(coord.x, coord.y, coloringType);
drawPixel(x, y, color[0], color[1], color[2]);
}
}
updatePixels();
}

function getFractalPointColor(x, y, coloringType) {
switch (fractalType) {
case "Newton Fractal":
return NewtonFract.getPointColor(x, y);
case "Mandelbrot Set":
return Mandelbrot.getPointColor(x, y);
case "Julia Set":
return Julia.getPointColor(x, y);
default:
return NewtonFract.getPointColor(x, y);
}
}

function drawPixel(x, y, r, g, b) {
pix = (x + y * width) * 4;
pixels[pix + 0] = r;
pixels[pix + 1] = g;
pixels[pix + 2] = b;
pixels[pix + 3] = 255;
}

function mousePressed() {
//Обработка только тех нажатий, которые произошли на канвасе
if (mouseX > width || mouseY > height)
return;
var halfWidth = Math.abs(fractalBorder.left - fractalBorder.right) / 4;
var realPoint = getRealCoordinate(mouseX, mouseY);
fractalBorder.top = realPoint.y - halfWidth;
fractalBorder.bottom = realPoint.y + halfWidth;
fractalBorder.left = realPoint.x - halfWidth;
fractalBorder.right = realPoint.x + halfWidth;

console.log(fractalBorder);
drawFractal();
}

function takeScreenshot() {
var fractalName = fractalSelect.value();
saveCanvas(fractalName, 'png');
}

function HSVtoRGB(h, s, v) {
var r, g, b, i, f, p, q, t;
if (arguments.length === 1) {
s = h.s, v = h.v, h = h.h;
}
i = Math.floor(h * 6);
f = h * 6 - i;
p = v * (1 - s);
q = v * (1 - f * s);
t = v * (1 - (1 - f) * s);
switch (i % 6) {
case 0:
r = v, g = t, b = p;
break;
case 1:
r = q, g = v, b = p;
break;
case 2:
r = p, g = v, b = t;
break;
case 3:
r = p, g = q, b = v;
break;
case 4:
r = t, g = p, b = v;
break;
case 5:
r = v, g = p, b = q;
break;
}
return {
r: Math.round(r * 255),
g: Math.round(g * 255),
b: Math.round(b * 255)
};
}

//Надеюсь сюда никто не посмотрит...
function setGUI() {
drawButton = createButton('Draw');
drawButton.mousePressed(drawFractal);
drawButton.position(width + 10, 10);
screenshotButton = createButton('Save image');
screenshotButton.mousePressed(takeScreenshot);
screenshotButton.position(width + 180, 10)
resetViewButton = createButton('Reset view');
resetViewButton.mousePressed(resetViewAndDraw);
resetViewButton.position(width + 80, 10);
var sl = createP('Max iterations slider');
sl.position(width + 10, 60);
iteraionsSlider = createSlider(2, 200, 50, 1);
iteraionsSlider.position(width + 10, 100);
maxIterations = iteraionsSlider.value();
fractalSelect = createSelect();
fractalSelect.option('Newton Fractal');
fractalSelect.option('Mandelbrot Set');
fractalSelect.option('Julia Set');
fractalSelect.changed(fractalTypeSelectEvent);
fractalSelect.position(width + 10, 40);
fractalType = fractalSelect.value();
coloringSelect = createSelect();
coloringSelect.option('Classic');
coloringSelect.option('Levels');
coloringSelect.option('Zebra');
coloringSelect.option('Rainbow');
coloringSelect.changed(coloringSelectEvent);
coloringSelect.position(width + 150, 40);
coloringType = coloringSelect.value();
sl = createP('Julia set re im sliders');
sl.position(width + 10, 120);

reSlider = createSlider(-1, 1, 0.4, 0.01);
reSlider.position(width + 10, 160);
imSlider = createSlider(-1, 1, -0.3, 0.01);
imSlider.position(width + 10, 190);

re = reSlider.value();
im = imSlider.value();
}
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