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Дремин Рома #11

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Дремин Рома #11

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60 changes: 60 additions & 0 deletions Lsystem.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,60 @@
class LSystem {

constructor(axiom, rule) {
this.axiom = axiom;
this.rule = rule;
}
buildSequence(depth) {
let result = this.axiom;
for (let i = 0; i < depth; i++) {
let sequence1 = "";
for (let j = 0; j < result.length; j++) {
if (this.rule[result[j]] === undefined)
sequence1 += result[j];
else
sequence1 += this.rule[result[j]];
}
result = sequence1;
}
return result;
}
}

const snowflacke = new LSystem("[F]+[F]+[F]+[F]+[F]+[F]", {"F" : "F[+FF][-FF]FF[+F][-F]FF"});
const bush = new LSystem("F", {"F" : "-F+F+[+F-F-]-[-F+F+F]"});
function drawFractal(fractal, context, startPos) {
context.beginPath();
if(fractal == "bush") {
drawFigure(startPos, context, {system : bush, depth : 5, length : 10, angle : Math.PI/8})
}
else{
drawFigure(startPos, context, {system : snowflacke, depth : 3, length : 3, angle : Math.PI/3})
}
context.stroke();
}

function drawFigure(position, context, figure) {
const sequence = figure.system.buildSequence(figure.depth);
const actions = buidRulesRunner(context, position, figure.length, figure.angle);
for (let i = 0; i < sequence.length; i++) {
if (actions[sequence[i]] != undefined)
actions[sequence[i]]();
}
}

function buidRulesRunner(drawingContext, startPos, length, angle) {
let position = startPos;
let stack = [];
let alphabet = {};
alphabet['F'] = () => {
drawingContext.moveTo(position.x, position.y);
position.x += Math.cos(position.angle) * length;
position.y += Math.sin(position.angle) * length;
drawingContext.lineTo(position.x, position.y);
}
alphabet['+'] = () => position.angle += angle;
alphabet['-'] = () => position.angle -= angle;
alphabet['['] = () => stack.push({x: position.x, y:position.y, angle: position.angle });
alphabet[']'] = () => position = stack.pop();
return alphabet;
}
105 changes: 7 additions & 98 deletions index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -3,108 +3,17 @@
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta http-equiv="Cache-Control" content="no-cache"/>

<script src="Lsystem.js"></script>
<script>
//пример рисования произвольного множества точек
function example1() {
//получаем html-элемент типа canvas и его характеристики
var canvas = document.getElementById("canvas1");
var canvasHeight = parseInt(canvas.getAttribute("height"));
var canvasWidth = parseInt(canvas.getAttribute("width"));

//создаем 2d context
function run() {
var canvas = document.getElementById("mainCanvas");
canvas.setAttribute("Width", window.innerWidth);
canvas.setAttribute("Height", window.innerHeight);
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);
}

//пример рисования отдельных линий
function example2() {
//получаем html-элемент типа canvas и его характеристики
var canvas = document.getElementById("canvas2");
var canvasHeight = parseInt(canvas.getAttribute("height"));
var canvasWidth = parseInt(canvas.getAttribute("width"));

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

//задаем стиль линий
context.lineWidth = "5";
context.strokeStyle = "green";

//начинаем создание нового пути
context.beginPath();
//задаем начальную точку линии
context.moveTo(0, 75);
//задаем конечную точку линии и добавляем линию в путь
context.lineTo(150, 100);
//выводим путь на экран
context.stroke();
}

//пример рисования полилиний (сначала вычисляем точки, затем рисуем)
function example3() {
//получаем html-элемент типа canvas и его характеристики
var canvas = document.getElementById("canvas3");
var canvasHeight = parseInt(canvas.getAttribute("height"));
var canvasWidth = parseInt(canvas.getAttribute("width"));

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

//задаем стиль линий
context.lineWidth = "2";
context.strokeStyle = "#FF0000";

//создаем массив точек
//в качестве точек используются анонимные объекты со свойствами x и y
var points = [{x: 20, y: 50}, {x: 120, y: 50}, {x: 120, y: 100}, {x: 50, y: 20}];

//начинаем создание нового пути
context.beginPath();
//добавляем в путь все точки из массива
for (var i = 0; i < points.length; i++) {
var point = points[i];
if (i == 0)
context.moveTo(point.x, point.y);
else
context.lineTo(point.x, point.y);
}
//выводим путь на экран
context.stroke();
}

//вызывается после загрузки body
function run () {
example1();
example2();
example3();
drawFractal("snowflacke", context, {x: window.innerWidth / 3, y: window.innerHeight - 100, angle: 0 });
}
</script>

<body onload="run()">
<canvas height='200' width='200' id='canvas1'></canvas>
<canvas height='200' width='200' id='canvas2'></canvas>
<canvas height='200' width='200' id='canvas3'></canvas>
<canvas height='200' width='200' id='mainCanvas'></canvas>
</body>
</html>