Python空cgi浏览器屏幕

我需要实时显示图形中的动态数据。因此，我需要每秒钟绘制一张更新数据的新图。Python空cgi浏览器屏幕

的问题是，我不能清空以前的输出在浏览器等，而不是得到一个简单的图形与更新的数据我得到很多的图表

的这里是代码。目前它有随机数据

def graph(data): 
    X,Y = 500, 275 #image width and height 
    img = Image.new("RGB", (X,Y), "#FFFFFF") 
    draw = ImageDraw.Draw(img) 

    #draw some axes and markers 
    for i in range(X/10): 
     draw.line((i*10+30, Y-15, i*10+30, 20), fill="#DDD") 
     if i % 5 == 0: 
      draw.text((i*10+15, Y-15), `i*10`, fill="#000") 
    for j in range(1,Y/10-2): 
     draw.text((0,Y-15-j*10), `j*10`, fill="#000") 
    draw.line((20,Y-19,X,Y-19), fill="#000") 
    draw.line((19,20,19,Y-18), fill="#000") 

    for i in range(1,len(data)): 
     draw.line((i+20,Y-20,i+20,Y-20-data[i]), fill="#000") 

    rtime = str(time.time()) 
    img.save("../images/out.png"+rtime, "PNG") 

    htmlBody = [] 
    htmlBody.insert(0, 'Content-type: text/html; charset=UTF-8\n') 
    htmlBody.append('<html>')  
    htmlBody.append('<body>')  
    htmlBody.append('<img src=\"../images/out.png'+rtime+'\" alt=\"\" />') 

    htmlBody.append("</body>") 
    htmlBody.append('</html>') 
    sys.stdout.flush() 
    sys.stdout.write('\n'.join(htmlBody)) 
    sys.stdout.flush() 





data = [] 
if (printgraph!=None): 
    sys.stdout = sys.stderr = oldsysout 
    for i in range(1,5): 
     data.append(int(250*(random.random()))) 
     graph(data) 
     sys.stdout.flush() 
     time.sleep(1) 
    exit()

来源

2011-12-15 Comments Comments