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Аносов #7

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198 changes: 94 additions & 104 deletions index.html
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Original file line number Diff line number Diff line change
@@ -1,110 +1,100 @@
<!doctype html>
<html>

<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta http-equiv="Cache-Control" content="no-cache"/>

<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
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();
}
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta http-equiv="Cache-Control" content="no-cache" />


<body>
<canvas height='1000' width='2000' id='canvas1'></canvas>
<p>
<label for="n">число итераций</label>
<input id="n">
</p>
<p>
<input id="elem" type="button" value="Построить">
</p>
<script>

elem.onclick = function () {
var canvas = document.getElementById("canvas1");
var count = document.getElementById("n").value;
var canvasHeight = parseInt(canvas.getAttribute("height"));
var canvasWidth = parseInt(canvas.getAttribute("width"));

//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);
var context = canvas.getContext('2d');
context.translate(200,200);

function Line(x1, y1, x2, y2) {
this.x1 = x1;
this.y1 = y1;
this.x2 = x2;
this.y2 = y2;
}

var startLine = new Line(640, 890, 690, 890);

dragonFractal(startLine, count);

function dragonFractal(startLine, count) {
if (count > 1) {
startLine = getLineCoords(startLine);

var newLine1 = firstAffins(startLine);
var newLine2 = secondAffins(startLine);

count--;

dragonFractal(newLine1, count);
dragonFractal(newLine2, count);

startLine = getCanvasCoords(startLine);

context.moveTo(startLine.x1, startLine.y1);
context.lineTo(startLine.x2,startLine.y2);
}
};

function firstAffins(line) {
return {
x1: (line.x1 + line.y1) / 2,
y1: (-line.x1 + line.y1) / 2,
x2: (line.x2 + line.y2) / 2,
y2: (-line.x2 + line.y2) / 2
}
}

function secondAffins(line) {
return {
x1: (-line.x1 + line.y1) / 2 - 1,
y1: -(line.x1 + line.y1) / 2,
x2: (-line.x2 + line.y2) / 2 - 1,
y2: -(line.x2 + line.y2) / 2
}
}

function getLineCoords(line) {
return {
x1: line.x1 - canvasWidth / 2,
y1: line.y1 - canvasHeight / 2,
x2: line.x2 - canvasWidth / 2,
y2: line.y2 - canvasHeight / 2
}
}

function getCanvasCoords(line) {
return {
x1: (line.x1 + canvasWidth)/2,
y1: (line.y1 + canvasHeight /2)/2,
x2: (line.x2 + canvasWidth)/2,
y2: (line.y2 + canvasHeight /2)/2
}
}

context.stroke();
}
//выводим путь на экран
context.stroke();
}

//вызывается после загрузки body
function run () {
example1();
example2();
example3();
}
</script>
</script>
</body>

<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>
</body>
</html>
</html>