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add dragon curve #2

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add dragon curve #2

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e351fd2
add dragon curve
Apforviolet Apr 17, 2018
625e238
Refactoring
Apforviolet May 23, 2018
75bd82b
Реализовано сохранение состояния
Apforviolet May 29, 2018
43398a2
Fixed
Apforviolet Jun 17, 2018
22c8cbe
Totaly fixed
Apforviolet Jun 19, 2018
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70 changes: 70 additions & 0 deletions Dragon Curve/DragonCurve.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,70 @@
var canvas = document.createElement('canvas');
document.body.insertBefore(canvas, document.body.firstChild);
canvas.style.position = 'fixed';
canvas.style.top = '0px';
canvas.style.left = '0px';
canvas.width = document.body.offsetWidth;
canvas.height = window.innerHeight;
var sky = canvas.getContext('2d');
var length = 15;
var axiome = "FX";
var currentSentence = axiome;
var sentences = [axiome];
var rules = {
"X": "X+YF+"
, "Y": "-FX-Y"
}
var keys = Object.keys(rules);

function toRadiance(degree) {
return degree * Math.PI / 180;
}

function generate() {
currentSentence = sentences[sentences.length - 1];
var nextSentence = "";
for (var i = 0; i < currentSentence.length; i++) {
var currentChar = currentSentence.charAt(i);
var found = false;
for (var j = 0; j < keys.length; j++) {
if (currentChar === keys[j]) {
found = true;
nextSentence += rules[keys[j]];
break;
}
}
if (!found)
nextSentence += currentChar;
}
sentences.push(nextSentence);
currentSentence = nextSentence;
}

function turtle(n) {
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Лучше сделать так, чтобы черепашка получала на вход готовое слово и его рисовала. Убери из нее логику выбора последнего sentence.

if (sentences.length > n)
currentSentence = sentences[n];
else {
let len = sentences.length;
for (var j = 0; j < n - len + 1; j++) {
generate();
}
}
sky.translate(600, 500);
sky.lineWidth = "1";
sky.strokeStyle = "green";
for (var i = 0; i < currentSentence.length; i++) {
var current = currentSentence.charAt(i);
if (current === "F") {
sky.beginPath();
sky.moveTo(0, 0);
sky.lineTo(0, -length);
sky.translate(0, -length);
sky.stroke();
} else if (current === "+") {
sky.rotate(toRadiance(90));
} else if (current === "-") {
sky.rotate(toRadiance(-90));
}
}
}
turtle(10);
15 changes: 15 additions & 0 deletions Dragon Curve/index.html
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Original file line number Diff line number Diff line change
@@ -0,0 +1,15 @@
<!DOCTYPE html>
<html lang="eng">

<head>

<meta charset="UTF-8">
<title>Document</title>
</head>

<body>
<script src="DragonCurve.js">
</script>
</body>

</html>