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Koch Added #1

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Koch Added #1

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fdc79d6
Koch Added
DarkSanny Feb 27, 2018
c7366f2
Refactoring
DarkSanny Feb 27, 2018
922d681
Try Add Slyder
DarkSanny Feb 27, 2018
d3407f3
Sliders added
DarkSanny Feb 27, 2018
c2be113
Slider's descriptions added
DarkSanny Feb 27, 2018
25a122d
Sliders updated to dynamic
DarkSanny Feb 28, 2018
239bad9
Numbers added
DarkSanny Feb 28, 2018
8dc148b
Убрал скроллинг
Deltvenga Feb 28, 2018
f23a61e
Merge pull request #1 from Deltvenga/master
DarkSanny Mar 1, 2018
fa9eb3b
Fixed code style
Mar 1, 2018
b665ae2
Renaming
DarkSanny Mar 17, 2018
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120 changes: 120 additions & 0 deletions koch.html
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Original file line number Diff line number Diff line change
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<!doctype html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta http-equiv="Cache-Control" content="no-cache"/>
<link rel="stylesheet" href="https://code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
<script>
var size = 500;
var count = 5;

$(document).ready(function () {
$("#sizer").slider( {
min: 100,
max: 1000,
value: size,
step: 10,
slide: changeSize,
change: changeSize
});
$("#counter").slider( {
min: 0,
max: 7,
value: count,
step: 1,
slide: changeCount,
change: changeCount
});
});

function changeSize(event, ui) {
size = ui.value;
$("#sizeUpdate").html(size);
main();
}

function changeCount(event, ui) {
count = ui.value;
$("#countUpdate").html(count);
main();
}

function main() {
setDefaultValues();
const context = getDefaultCanvasContext();
const triangleHeight = Math.sqrt(3) * size / 2;
const center = { x: window.innerWidth / 2, y: window.innerHeight / 2 };
const point1 = { x: center.x + size / 2, y: center.y - triangleHeight / 2 };
const point2 = { x: center.x - size / 2, y: center.y - triangleHeight / 2 };
const point3 = { x: center.x, y: center.y + triangleHeight / 2 };
drawKochSnowflake(context, point1, point2, point3, count);
}

function drawKochSnowflake(context, point1, point2, point3, count) {
drawFractal(context, point1, point2, count);
drawFractal(context, point2, point3, count);
drawFractal(context, point3, point1, count);
}

function setDefaultValues(){
$("#sizeUpdate").html(size);
$("#countUpdate").html(count);
}

function getDefaultCanvasContext() {
const canvas = document.getElementById("canvas");
canvas.setAttribute("Width", window.innerWidth);
canvas.setAttribute("Height", window.innerHeight);
const context = canvas.getContext('2d');
context.lineWidth = "1";
context.strokeStyle = "#000000";
context.clearRect(0, 0, window.innerWidth, window.innerHeight);
return context;
}

function drawFractal(context, startPoint, finishPoint, count) {
if (count === 0) {
drawLineOn(context, startPoint, finishPoint);
return;
}
const firstPoint = { x: startPoint.x + (finishPoint.x - startPoint.x) / 3, y: startPoint.y + (finishPoint.y - startPoint.y) / 3 };
const secondPoint = { x: startPoint.x + 2 * (finishPoint.x - startPoint.x) / 3, y: startPoint.y + 2 * (finishPoint.y - startPoint.y) / 3 }
const middlePoint = findMiddlePoint(firstPoint, secondPoint);
drawFractal(context, startPoint, firstPoint, count - 1);
drawFractal(context, firstPoint, middlePoint, count - 1);
drawFractal(context, middlePoint, secondPoint, count - 1);
drawFractal(context, secondPoint, finishPoint, count - 1);
}

function findMiddlePoint(startPoint, finishPoint) {
const vector = { x: finishPoint.x - startPoint.x, y: finishPoint.y - startPoint.y };
const angle = Math.atan2(vector.y, vector.x) + Math.PI / 3;
const length = Math.sqrt(vector.x * vector.x + vector.y * vector.y);
return getCartesianPoint(startPoint, length, angle);
}

function getCartesianPoint(center, length, angle) {
return {
x: center.x + (length * Math.cos(angle)),
y: center.y + (length * Math.sin(angle))
};
}

function drawLineOn(canvasContext, sPoint, fPoint) {
canvasContext.beginPath();
canvasContext.moveTo(sPoint.x, sPoint.y);
canvasContext.lineTo(fPoint.x, fPoint.y);
canvasContext.stroke();
}
</script>
</head>
<body onload="main()" style="overflow: hidden">
Size: <span id="sizeUpdate">0</span>
<div id="sizer"></div>
Count: <span id="countUpdate">0</span>
<div id="counter"></div>
<canvas height='2000' width='2000' id='canvas'></canvas>
</body>
</html>