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July 17, 2019 16:07
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Media Elipse con JavaScript
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<!DOCTYPE html> | |
<html> | |
<head> | |
<meta charset="utf-8"> | |
<meta name="viewport" content="width=device-width"> | |
<title>Media elipse con canvas</title> | |
</head> | |
<body> | |
<h1>Media elipse con canvas y JavaScript</h1> | |
<a href="//parzibyte.me/blog">By Parzibyte</a> | |
<br> | |
<canvas id="canvas"></canvas> | |
<script src="script.js"></script> | |
</body> | |
</html> |
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/** | |
* Ejercicios con Canvas y JavaScript: dibujo de figuras geométricas | |
* | |
* https://parzibyte.me/blog | |
*/ | |
const ALTURA_CANVAS = 200, | |
ANCHURA_CANVAS = 400; | |
// Obtener el elemento del DOM | |
const canvas = document.querySelector("#canvas"); | |
canvas.width = ANCHURA_CANVAS; | |
canvas.height = ALTURA_CANVAS; | |
// Del canvas, obtener el contexto para poder dibujar | |
const contexto = canvas.getContext("2d"); | |
// Estilo de dibujo | |
// Grosor de línea | |
contexto.lineWidth = 5; | |
// Color de línea | |
contexto.strokeStyle = "#212121"; | |
// Color de relleno | |
contexto.fillStyle = "#81C784"; | |
// Las variables indican el nombre de cada argumento para | |
// la función ellipse | |
let x = 100, | |
y = 100, | |
radioX = 50, | |
radioY = 80, | |
// Rotación expresada en radianes, | |
// que puedes obtener dividiendo | |
// Math.PI. Por ejemplo, para una | |
// elipse "horizontal" la rotación | |
// debería estar en Math.PI / 2 | |
rotacion = 0, | |
anguloInicio = Math.PI, // Para que sea a la mitad | |
anguloFin = Math.PI * 2; | |
contexto.ellipse(x, y, radioX, radioY, rotacion, anguloInicio, anguloFin); | |
// Hacemos que se dibuje | |
contexto.stroke(); | |
// Lo rellenamos | |
contexto.fill(); |
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