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JavaScript绘制曲线、圆形饼图实例.doc

发布:2017-12-17约4.99千字共6页下载文档
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html head titleJavaScript绘制曲线、圆形饼图实例/title script language=JavaScript IE4 = ! (navigator.appVersion.charAt(0) 4 || navigator.appName == Netscape) var xo=0 var yo=0 var Ox = -1 var Oy = -1 var rad = Math.PI/180 var maxY = 400 var color = red function print(str) { document.write(str) } function orgY(y) { return maxY-y } function outPlot(x,y,w,h) { print(span style=position:absolute;left:+x+;top:+y+;height:+h+;width:+w+;font-size:1px;background-color:+color+/span) } function Plot(x,y) { outPlot(x,y,1,1) if(Ox=0 || Oy=0) { ShowLine(Ox,Oy,x-Ox,y-Oy) } Ox = x Oy = y } function ShowLine(x,y,w,h) { if(w0) { x += w w = Math.abs(w) } if(h0) { y += h h = Math.abs(h) } if(w1) w=1 if(h1) h=1 outPlot(x,y,Math.round(w),Math.round(h)) } function LineTo(x,y) { Line(xo,yo,x,y) } function sign(n) { if(n0) return 1 if(n0) return -1 return n } function Line(x1,y1,x2,y2) { x2 = Math.round(x2) y2 = Math.round(y2) xo = x2 yo = y2 y1 = orgY(y1) y2 = orgY(y2) var str = var i=0 var x = x1 var y = y1 dx = Math.abs(x2-x1) dy = Math.abs(y2-y1) s1 = sign(x2-x1) s2 = sign(y2-y1) if(dx==0 || dy==0) { ShowLine(x1,y1,x2-x1,y2-y1) return } if(dxdy) { temp = dx dx = dy dy = temp key = 1 }else key = 0 e = 2*dy-dx for(i=0;idx;i++) { px = 0 py = 0 Plot(x,y) while(e=0) { if(key==1) { x += s1 px += s1 }else { y += s2 py += s2 } e = e-2*dx } if(key==1) y += s2 else x += s1 e = e+2*dy } } function MoveTo(x,y) { Ox = Oy = -1 xo = Math.round(x) yo = Math.round(y) } // 圆 function Cir(x,y,r) { MoveTo(x+r,y) for(i=0;i=360;i+=5) { LineTo(r*Math.cos(i*rad)+x,r*Math.sin(i*rad)+y) }
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