<button onclick= "testDrawCurve() "> 画曲线 </button>
<button onclick= "testDrawArc() "> 画弧线 </button>
<button onclick= "testDrawCircle() "> 画圆 </button>
<button onclick= "testDrawLine() "> 画线 </button>
<button onclick= "testDrawRectangle() "> 画矩形 </button>
<button onclick= "testDrawPie() "> 画饼图 </button>
<div id=div1> </div>
<SCRIPT LANGUAGE= "JavaScript ">
<!--
function testDrawCurve()
{
div1.innerHTML = drawCurve();
}
function testDrawArc()
{
div1.innerHTML =drawArc(150,150,100,0,270, "blue ")
}
function testDrawCircle()
{
div1.innerHTML = drawCircle(200,200,150, "blue ");
}
function drawCircle(x0,y0,radius,color)
{
return drawArc(x0,y0,radius,0,360,color)
}
function testDrawLine()
{
div1.innerHTML = drawLine(100,200,500,200, "yellow ")+drawLine(300,100,300,400, "black ")+drawLine(600,400,100,100, "violet ")
}
function testDrawRectangle()
{
div1.innerHTML = drawRectangle(200,100,600,200, "blue ")+drawRectangle(100,200,400,500, "red ")
}
function testDrawPie()
{
div1.innerHTML = drawPie(300,200,120,0,45, "red ");
}
function drawLine(x0,y0,x1,y1,color)
{
var rs = " ";
if (y0 == y1) //画横线
{
if (x0> x1){var t=x0;x0=x1;x1=t}
rs = " <span style= 'top: "+y0+ ";left: "+x0+ ";position:absolute;font-size:1px;background-color: "+color+ ";height:1; width: "+Math.abs(x1-x0)+ " '> </span> ";
}
else if (x0 == x1) //画竖线
{
if (y0> y1){var t=y0;y0=y1;y1=t}
rs = " <span style= 'top: "+y0+ ";left: "+x0+ ";position:absolute;font-size:1px;background-color: "+color+ ";width:1;height: "+Math.abs(y1-y0)+ " '> </span> ";
}
else
{
var lx = x1-x0
var ly = y1-y0
var l = Math.sqrt(lx*lx+ly*ly)
rs = new Array();
var px,py,px0,py0,p;
for (var i=0;i <l;i+=1)
{
p = i/l;
px = parseInt(x0 + lx*p);
py = parseInt(y0 + ly*p);
if (px0!=px || py0!= py)
rs[rs.length] = " <span style= 'top: "+py+ ";left: "+px+ ";height:1;width:1;position:absolute;font-size:1px;background-color: "+color+ " '> </span> ";
px0=px;
py0=py;
}
rs = rs.join( " ");
}
return rs
}
function drawRectangle(x0,y0,x1,y1,color)
{
x0=parseInt(x0);
x1=parseInt(x1);
y0=parseInt(y0);
y1=parseInt(y1);
if (x0 == x1 || y0 == y1) return;
if (x0> x1) {var t=x0;x0=x1;x1=t}
if (y0> y1) {var t=y0;y0=y1;y1=t}
return " <span style= 'top: "+y0+ ";left: "+x0+ ";position:absolute;background-color= "+color+ "; width: "+(x1-x0)+ " ;height: "+(y1-y0)+ " '> </span> ";
}
function drawPie(x0,y0,radius,startAngle,endAngle,color)
{
var rs = drawArc(x0,y0,radius,startAngle,endAngle,color)
startAngle = startAngle/360*Math.PI*2;
endAngle = endAngle/360*Math.PI*2;
var startx=Math.sin(startAngle)*radius+x0;
var endx=Math.sin(endAngle)*radius+x0;
var starty=Math.cos(startAngle)*radius+y0;
var endy=Math.cos(endAngle)*radius+y0;
rs += drawLine(x0,y0,startx,starty,color)
rs += drawLine(x0,y0,endx,endy,color)
return rs;
}
function drawArc(x0,y0,radius,startAngle,endAngle,color)
{
rs = new Array();
tmpar = new Array();
startAngle = startAngle/360*Math.PI*2;
endAngle = endAngle/360*Math.PI*2;
var dx,dy,dx0,dy0;
for (var i=startAngle;i <endAngle;i+=(1/radius))
{
dx = parseInt(Math.sin(i)*radius+x0);
dy = parseInt(Math.cos(i)*radius+y0);
if (dx!=dx0 || dy!=dy0)
rs[rs.length] = " <span style= 'top: "+dy+ ";left: "+dx+ ";position:absolute;height:1;width:1;position:absolute;font-size:1px;background-color: "+color+ " '> </span> ";
dx0=dx;dy0=dy;
}
return (rs.join( " "));
}
function drawCurve()
{
var rs = new Array();
for (var i=0;i <2*Math.PI;i+=.01)
{
var x = parseInt(300-Math.sin(i)*100)
var y = parseInt(300-Math.cos(i)*100)
rs[rs.length] = " <span style= 'top: "+x+ ";left: "+(i*100+90)+ " ;height:1;width:1;position:absolute;font-size:1px;background-color:blue '> </span> ";
rs[rs.length] = " <span style= 'top: "+y+ ";left: "+(i*100+90)+ " ;height:1;width:1;position:absolute;font-size:1px;background-color:blue '> </span> ";
}
return rs.join( " ");
}
//-->
想用代码做一条彩虹，学java的，理解有点慢，代码是神奇的，但是实在不会驾驭，我只会修修改改，百度了很多只找到个这个觉得好像还有点用，
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但好像只有按钮啊，点又没反应，是不是用错浏览器了