<input type="radio" name="type" value="static top">静止顶部
<input type="radio" name="type" value="static bottom">静止底部
</div>
<div id="speedpick">
<input type="radio" name="speed" value="1">1X
<input type="radio" name="speed" value="2">2X
<input type="radio" name="speed" value="3">3X
</div>
<div id="stylepick"></div>
</div>
<script>
var c=document.getElementById("cv_video");
var typeDom=document.getElementsByName("type");
var speedDom=document.getElementsByName("speed");
var colorpick=document.getElementById("colorpick");
var smsg=document.getElementById("smsg");
var color="#white";
var speed=1;
var type="default";
var msgs=[];
//获取画布大小
var c_height=c.height;
var c_width=c.width;
//获取画布
ctx=c.getContext("2d");
ctx.font="25px DengXian";
//处理颜色选择
colorpick.addEventListener('click',function(event){
switch(event.target.id){
case "white":
color="white";
break;
case "red":
color="#ff6666";
break;
case "yellow":
color="#ffff00";
break;
case "green":
color="#339933";
break;
case "blue":
color="#333399";
break;
}
})
//处理发送弹幕
document.getElementById("send").onclick=function(){
var text=smsg.value;
for(var i=0;i<typeDom.length;i++){
if(typeDom[i].checked){
type=typeDom[i].value;
break;
}
}
for(var i=0;i<speedDom.length;i++){
if(speedDom[i].checked){
speed=2*parseInt(speedDom[i].value);
break;
}
}
var tempBarrage=new Barrage(text,color,type,speed);
msgs.push(tempBarrage);
}
//
//弹幕功能部分代码
//
//弹幕对象
function Barrage(content,color,type,speed){
this.content=content;
this.color=color;
this.type=type;
this.speed=speed;
if(this.type=="default"){
this.height=parseInt(Math.random()*c_height)+10;
}else if (this.type=="static top"){
this.height=parseInt((c_height/2)-Math.random()*c_height/2)+10;
}else if (this.type=="static bottom"){
this.height=parseInt((c_height/2)+Math.random()*c_height/2)+10;
}
if(typeof this.move!="function"){
Barrage.prototype.move=function(){
if(this.type=="default"){
this.left=this.left-this.speed;
}
}
}
}
//循环擦写画布实现动画效果
setInterval(function(){
ctx.clearRect(0,0,c_width,c_height);
