50 lines
833 B
JavaScript
50 lines
833 B
JavaScript
var canvas;
|
|
var ctx;
|
|
|
|
var background;
|
|
var width = 300;
|
|
var height = 200;
|
|
|
|
var cloud;
|
|
var cloud_x;
|
|
|
|
function init() {
|
|
canvas = document.getElementById("clouds");
|
|
width = canvas.width;
|
|
height = canvas.height;
|
|
ctx = canvas.getContext("2d");
|
|
|
|
// init background
|
|
background = new Image();
|
|
background.src = 'http://silveiraneto.net/wp-content/uploads/2011/06/forest.png';
|
|
|
|
// init cloud
|
|
cloud = new Image();
|
|
cloud.src = 'http://silveiraneto.net/wp-content/uploads/2011/06/cloud.png';
|
|
cloud.onload = function(){
|
|
cloud_x = -cloud.width;
|
|
};
|
|
|
|
return setInterval(main_loop, 10);
|
|
}
|
|
|
|
function update(){
|
|
cloud_x += 0.3;
|
|
if (cloud_x > width ) {
|
|
cloud_x = -cloud.width;
|
|
}
|
|
}
|
|
|
|
function draw() {
|
|
ctx.drawImage(background,0,0);
|
|
ctx.drawImage(cloud, cloud_x, 0);
|
|
}
|
|
|
|
function main_loop() {
|
|
draw();
|
|
update();
|
|
}
|
|
|
|
init();
|
|
|