Animación de la gravedad en canvas
Publicado por valentin (24 intervenciones) el 19/03/2020 22:21:30
Se supone que un circulo rojo debería rebotar. Pero tiene un error.
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<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
<style>
canvas {border:1px solid #d3d3d3;
background-color: #f1f1f1;
}</style>
</head>
<body onload="startGame()">
<script>
var myGamePiece;
function startGame() {
myGamePiece = new component(30, 30, "red", 80, 75);
myGameArea.start();
}var myGameArea = {
canvas : document.createElement("canvas"),
start : function() {
this.canvas.width = 480;
this.canvas.height = 270;
this.context = this.canvas.getContext("2d");
document.body.insertBefore(this.canvas, document.body.childNodes[0]);
this.interval = setInterval(updateGameArea, 20);
},
stop : function() {
clearInterval(this.interval);
},
clear : function() {
this.context.clearRect(0, 0, this.canvas.width, this.canvas.height);
}}function component(color, x, y, type) {
this.type = type;
this.x = x;
this.y = y;
this.speedX = 0;
this.speedY = 0;
this.gravity = 0.1;
this.gravitySpeed = 0;
this.bounce = 0.6;
this.update = function() {
ctx = myGameArea.context;
ctx.fillStyle = color;
ctx.arc(x,y,10,0,2*Math.PI);
}this.newPos = function() {
this.gravitySpeed += this.gravity;
this.x += this.speedX;
this.y += this.speedY + this.gravitySpeed;
this.hitBottom();
}this.hitBottom = function() {
var rockbottom = myGameArea.canvas.height - this.height;
if (this.y > rockbottom) {
this.y = rockbottom;
this.gravitySpeed = -(this.gravitySpeed * this.bounce);
} }}function updateGameArea() {
myGameArea.clear();
myGamePiece.newPos();
myGamePiece.update();
}</script>
</body>
</html>
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