在控制台中输入
db.drawCircle([50,50],20,"black");
db.drawLine([5,5],[36,44],"red");
可以看到效果
复制代码 代码如下:
<bodystyle="margin:0px;">
</body>
<script>
functionDrawingBoard(width,height,size)
{
size=size||3
varcontainer=document.createElement("div");
this.container=container;

container.runtimeStyle.width=(width)*size+"px";
container.runtimeStyle.height=(height)*size+"px";
container.runtimeStyle.margin="0px";
//container.style.border="solid1pxblue";
varcount=0;
for(vary=0;y<height;y++)
{
for(varx=0;x<width;x++)
{
varcurr=document.createElement("div");
curr.runtimeStyle.height=size+"px";
curr.runtimeStyle.width=size+"px";
curr.runtimeStyle.display="inline";
curr.runtimeStyle.overflow="hidden";
curr.style.backgroundColor="green";
curr.src="";
container.appendChild(curr);
}
}
//alert(curr.currentStyle.display);
//document.body.appendChild(container);

this.drawLine=function(start,end,color)
{
vardx=start[0]-end[0];
vardy=start[1]-end[1];
varx,y;

if(Math.abs(dx)>Math.abs(dy))
{
for(varx=start[0];x!=end[0]+(end[0]-start[0])/Math.abs(end[0]-start[0]);x+=(end[0]-start[0])/Math.abs(end[0]-start[0]))
{
y=Math.round((x-start[0])/dx*dy+start[1]);
this.container.childNodes[this.trans([x,y])].style.backgroundColor=color;
}
}
else
{
for(vary=start[1];y!=end[1]+(end[1]-start[1])/Math.abs(end[1]-start[1]);y+=(end[1]-start[1])/Math.abs(end[1]-start[1]))
{
x=Math.round((y-start[1])/dy*dx+start[0]);
this.container.childNodes[this.trans([x,y])].style.backgroundColor=color;
}
}
}
this.drawCircle=function(m,R,color)
{

for(varr=0;r<=Math.floor(Math.sqrt(R*R-r*r));r++)
{

x=m[0]+r;y=m[1]+Math.floor(Math.sqrt(R*R-r*r));
this.container.childNodes[this.trans([x,y])].style.backgroundColor=color;
x=m[0]-r;y=m[1]+Math.floor(Math.sqrt(R*R-r*r));
this.container.childNodes[this.trans([x,y])].style.backgroundColor=color;
x=m[0]+r;y=m[1]-Math.floor(Math.sqrt(R*R-r*r));
this.container.childNodes[this.trans([x,y])].style.backgroundColor=color;
x=m[0]-r;y=m[1]-Math.floor(Math.sqrt(R*R-r*r));
this.container.childNodes[this.trans([x,y])].style.backgroundColor=color;
y=m[1]+r;x=m[0]+Math.floor(Math.sqrt(R*R-r*r));
this.container.childNodes[this.trans([x,y])].style.backgroundColor=color;
y=m[1]-r;x=m[0]+Math.floor(Math.sqrt(R*R-r*r));
this.container.childNodes[this.trans([x,y])].style.backgroundColor=color;
y=m[1]+r;x=m[0]-Math.floor(Math.sqrt(R*R-r*r));
this.container.childNodes[this.trans([x,y])].style.backgroundColor=color;
y=m[1]-r;x=m[0]-Math.floor(Math.sqrt(R*R-r*r));
this.container.childNodes[this.trans([x,y])].style.backgroundColor=color;

}


}
this.appendto=function(parent)
{
parent.appendChild(this.container);
}

this.drawPoint=function(p,color)
{
this.container.childNodes[this.trans(p)].style.backgroundColor=color;
}
this.trans=function(p)
{
returnp[0]+p[1]*width;
}

container=null;
}
functionConsole(width,height,command)
{
varcontainer=document.createElement("div");
this.container=container;

container.runtimeStyle.width=(width);
container.runtimeStyle.height=(height);
container.runtimeStyle.margin="0px";
container.runtimeStyle.backgroundColor="black";
container.runtimeStyle.fontFamily="Terminal";
container.runtimeStyle.color="white";
container.runtimeStyle.fontSize="16px";
this.output=document.createElement("div");
container.appendChild(this.output);
container.innerHTML+="js>"
this.input=document.createElement("input");
container.appendChild(this.input);
this.input.runtimeStyle.backgroundColor="black";
this.input.runtimeStyle.borderWidth="0px";
this.input.runtimeStyle.color="white";
this.input.runtimeStyle.fontFamily="Terminal";
this.input.runtimeStyle.width="90%"
this.input.runtimeStyle.fontSize="16px"
this.input.runtimeStyle.position="relative";
this.input.runtimeStyle.top="2px";
command=command||function(str)
{

vare;
try{
varr=eval(str);
}catch(e){
return"Badcommand";
}
returnr;

}
this.run=function(str)
{

this.input.parentNode.childNodes[0].innerHTML+=str+'<br/>'
this.input.parentNode.childNodes[0].innerHTML+=(command(str)+"<br/>")

}
this.input.command=function()
{
this.parentNode.childNodes[0].innerHTML+=this.value+'<br/>'
this.parentNode.childNodes[0].innerHTML+=(command(this.value)+"<br/>")
}
this.input.onkeyup=newFunction("e","e=e||event;if(e.keyCode!=13)return;this.command();this.value='';");
this.appendto=function(parent)
{
parent.appendChild(this.container);
}
container=null;
}

varc=newConsole("100%","50%");
c.appendto(document.body);
c.run("window.db=newDrawingBoard(100,100);document.body.appendChild(db.container);");
</script>