我制作了一个基本的星空程序,使用javascript加载到画布中。
我一直试图通过将画布放到页面上将其合并到一个ember站点,但我不知道如何加载程序。我已经尝试将代码包含在页面的路由器,控制器中,从单独的文件加载它等。不确定从这里去哪里。有什么指针吗?
我假设我可以使用......
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<link rel="stylesheet" href="css/style.css">
<script src="js/libs/jquery-1.10.2.js"></script>
<script src="js/libs/handlebars-1.1.2.js"></script>
<script src="js/libs/ember-1.5.1.js"></script>
<script src="js/app.js"></script>
</script>
</head>
<body>
...
<script type="text/x-handlebars" id="starfield">
<canvas id='c'></canvas>
</script>
</body>
</html>
对于HTML。
然后......
App = Ember.Application.create({
LOG_TRANSITIONS: true
});
App.Router.map(function() {
this.route('starfield');
});
为app文件。但是我在哪里放置星域的代码?
答案 0 :(得分:1)
现在,我看到你正在尝试做什么,我完全将它组件化
App.StarFieldComponent = Em.Component.extend({
tagName:'canvas',
width: 400,
height: 300,
starCount:100,
refresh:30,
attributeBindings:['width', 'height'],
stars:null,
on:false,
build: function(){
var canvas = this.$()[0],
ctx = canvas.getContext('2d'),
stars = [],
height = this.get('height'),
width = this.get('width');
for (var i = 0, len = this.get('starCount'); i < len; i++){
stars.push([Math.random() * width, Math.random() * height, Math.random() * 2, 0.5 + Math.random() / 2]);
}
this.set('stars', stars);
this.set('ctx', ctx);
this.set('on', true);
}.on('didInsertElement').observes('starCount', 'width', 'height'),
kill: function(){
this.set('on', false);
}.on('willDestroyElement'),
clear: function () {
var ctx = this.get('ctx'),
height = this.get('height'),
width = this.get('width');
ctx.fillStyle = 'black';
ctx.clearRect(0, 0, width, height);
ctx.beginPath();
ctx.rect(0, 0, width, height);
ctx.closePath();
ctx.fill();
},
drawStars: function () {
var stars = this.get('stars'),
starCount = stars.length,
ctx = this.get('ctx');
for (var i = 0; i < starCount; i++) {
ctx.fillStyle = 'rgba(255, 255, 0, ' + stars[i][3] + ')';
ctx.beginPath();
ctx.arc(stars[i][0], stars[i][1], stars[i][2], 0, Math.PI * 2, true);
ctx.closePath();
ctx.fill();
}
},
moveStars :function (e) {
var stars = this.get('stars'),
starCount = stars.length,
height = this.get('height'),
width = this.get('width');;
for (var i = 0; i < starCount; i++) {
if (stars[i][1] - stars[i][2] > height) {
stars[i][0] = Math.random() * width;
stars[i][2] = Math.random() * 2;
stars[i][1] = 0 - stars[i][2];
stars[i][3] = 0 + Math.random() / 2;
} else {
stars[i][1] += e;
}
}
},
gaze: function(){
if(this.get('on')){
this.loop();
}
}.observes('on'),
loop: function () {
if(!this.get('on')){
return;
}
var refreshRate = this.get('refresh');
this.clear();
this.moveStars(3);
this.drawStars();
Em.run.later(this, this.loop, refreshRate);
}
});
然后在模板中,您可以轻松插入删除
{{star-field width=300 height=200 starCount=20}}
{{star-field width=400 height=200 starCount=500 refresh=10}}
{{star-field width=100 height=100}}
{{star-field}}
静态变量:http://emberjs.jsbin.com/yaxoweya/8/edit
绑定变量:http://emberjs.jsbin.com/yaxoweya/9/edit
对于模型,您将设置与路由器名称匹配的路由。如果您的路线是名词,通常使用this.resource
,如果是verb
则使用this.route
App = Ember.Application.create();
App.Router.map(function() {
this.resource('starfield')
});
App.IndexRoute = Ember.Route.extend({
model: function() {
return ['red', 'yellow', 'blue'];
}
});
App.StarfieldRoute = Em.Route.extend({
model:function(){
return {apple:'cow'};
}
});
App.StarfieldController = Em.ObjectController.extend({
foo:'bar'
});
App.StarfieldView = Em.View.extend({
click: function(){
alert('you clicked this view!');
}
});