复制代码 代码如下:

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 

<body margin=”0″>
</body>
<script>
    function Console(width,height,command)
    {
        var container=document.createElement(“div”);
        this.container=container;

复制代码 代码如下:

        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)
        {

<body style=”margin:0px;”> 
</body> 
<script> 
    function DrawingBoard(width,height,size) 
    { 
        size=size||3 
        var container=document.createElement(“div”); 
        this.container=container; 

            var e;
            try{
                var r=eval(str);
            } catch(e) {
                return “Bad command”;
            }
            return r;

        container.runtimeStyle.width=(width)*size+”px”; 
        container.runtimeStyle.height=(height)*size+”px”; 
        container.runtimeStyle.margin=”0px”; 
        //container.style.border=”solid 1px blue”; 
        var count=0; 
                for(var y=0;y<height;y++) 
        { 
            for(var x=0;x<width;x++) 
            { 
                var curr=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) 
        { 
            var dx=start[0]-end[0]; 
            var dy=start[1]-end[1]; 
            var x,y; 

        this.input.command=function()
        {
            this.parentNode.childNodes[0].innerHTML+=this.value+'<br/>’
            this.parentNode.childNodes[0].innerHTML+=(command(this.value)+”<br/>”)

            if( Math.abs(dx) > Math.abs(dy) ) 
            { 
                for(var x=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(var y=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) 
        { 

        }
        this.input.onkeyup=new Function(“e”,”e=e||event;if(e.keyCode!=13)return;this.command();this.value=”;”);
        this.appendto=function(parent)
        {
            parent.appendChild(this.container);
        }
        container=null;
    }

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

    //var db=new DrawingBoard(100,100)
    //db.drawLine([5,5],[36,44],”red”)
    //document.body.appendChild(db.container);
    var c=new Console(“100%”,”100%”);
    c.appendto(document.body);

                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; 

</script>

            } 

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

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