JavaScript 繪圖代碼

2019-11-21 01:31:11

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<html> <head> <title>JavaScript繪圖</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(w<0) { x += w w = Math.abs(w) } if(h<0) { y += h h = Math.abs(h) } if(w<1) w=1 if(h<1) h=1 outPlot(x,y,Math.round(w),Math.round(h)) } function LineTo(x,y) { Line(xo,yo,x,y) } function sign(n) { if(n>0) return 1 if(n<0) 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(dx>dy) { temp = dx dx = dy dy = temp key = 1 }else key = 0 e = 2*dy-dx for(i=0;i<dx;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) } // 圓 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) } } // 弧形 function Arc(x,y,r,a1,a2) { MoveTo(r*Math.cos(a1*rad)+x,r*Math.sin(a1*rad)+y) for(i=a1;i<=a2;i++) { LineTo(r*Math.cos(i*rad)+x,r*Math.sin(i*rad)+y) } } // 扇形 function Pei(x,y,r,a1,a2) { MoveTo(x,y) for(var i=a1;i<=a2;i++) { LineTo(r*Math.cos(i*rad)+x,r*Math.sin(i*rad)+y) } LineTo(x,y) } // 彈出扇形 function PopPei(x,y,r,a1,a2) { dx = r*Math.cos((a1+(a2-a1)/2)*rad)/10 dy = r*Math.sin((a1+(a2-a1)/2)*rad)/10 x += dx y += dy MoveTo(x,y) for(var i=a1;i<=a2;i++) { LineTo(r*Math.cos(i*rad)+x,r*Math.sin(i*rad)+y) } LineTo(x,y) } // 矩形 function Rect(x,y,w,h) { MoveTo(x,y) LineTo(x+w,y) LineTo(x+w,y+h) LineTo(x,y+h) LineTo(x,y) } // 準(zhǔn)星 function zhunxing(x,y) { var ox = xo var oy = yo var oColor = color color = "#000000" Line(x-5,y,x+6,y) Line(x,y-6,x,y+5) print('<span style="position:absolute;font-size:10pt;left:'+(x+5)+';top:'+orgY(y+5)+';">['+x+','+y+']</span>') color = oColor xo = ox yo = oy } // 標(biāo)注 function biaozhuStr(x,y,s) { return '<span style="position:absolute;font-size:10pt;left:'+x+';top:'+orgY(y)+';">'+s+'</span>' } function biaozhu(x,y,s,t) { var ox = xo var oy = yo var oColor = color point = "p01.gif" if(t==1) { print(biaozhuStr(x-5,y+6,"?"+s)) } if(t==2) { print(biaozhuStr(xo+x*Math.cos(y*rad)-10,yo+x*Math.sin(y*rad),s)) } color = oColor xo = ox yo = oy } </script> </head> <body> <table border="0" width="100%"> <tr> <td width="100%" style="font-family: 方正舒體; font-size: 18pt; color: #FF0000" class="t1">JavaScript繪圖</td> </tr> <tr> <td width="100%" style="font-family: 幼圓; font-size: 12pt; color: #008000" class="t2"> 如果需要在網(wǎng)頁上提供圖形化的資料，通常是將其制作成圖片，但這樣一來網(wǎng)絡(luò)上的開銷就太大了。有什么辦法呢？這里向你提供一組JavaScript函數(shù)，來解決這一問題。雖然簡單了點(diǎn)，但是對(duì)畫點(diǎn)線圖來說還是綽綽有余的！</td> </tr> </table> <script> if(IE4) { // 基本圖形 color = "maroon" Cir(50,40,20) Arc(100,40,20,60,120) Pei(150,60,40,240,300) Rect(200,20,40,40) // 折線圖 color = "#FF0000" var jd = new Array( 203,232,277,223,271,234,273,284,276,250,267,280 ) MoveTo(30,jd[0]-40) biaozhu(xo,yo,jd[0]) for(i=1;i<jd.length;i++) { LineTo(i*30+30,jd-40) biaozhu(xo,yo,jd,1) } color = "#C0C0C0" Line(30,140,i*30+30,140) Line(30,140,30,260) // 餅圖 color = "#00FF00" var gc = new Array( 150,120,200,180,180 ) var s = 0 var m = 0 var n = 0 for(i=0;i<gc.length;i++) { s +=gc if(gc > m) { m = gc n = i } } var k = s/360 var mm = 0 var a =0 for(i=0;i<gc.length;i++) { b = Math.round((gc+mm)/k) if(i==n) PopPei(600,150,100,a,b) else Pei(600,150,100,a,b) biaozhu(60,a+(b-a)/2,Math.round(gc/s*100)+"%",2) mm = mm+gc a = b } // 十字標(biāo)注 MoveTo(280,20) zhunxing(xo,yo) }else { document.write("<p> </p><table bgcolor=#FF0000><tr><td><font color=#FFFF00>對(duì)不起！您的瀏覽器不能支持該頁的某些功能，請(qǐng)換用IE4.0以上版本的瀏覽器！謝謝！</font></td></tr></table>") } </script> </body> </html>

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