[Tutor] Help with % conversion to output colour

Sat Jul 18 04:53:44 CEST 2009

Hi, 

I'm working on an assignment that requires the user RGB requested output to create a colour block in fractional steps.  I'm pretty much down to the last bit, however, I've hit a road block in that my percentages are not showing as a colour block but as the <div> tag percentages. 

Any suggestions on what I'm missing to output the %'s into the colour block showing colour? 

Thanks for any help. 

Cassandra 

import cgi 
form = cgi.FieldStorage() 

# print HTTP/HTML header stuff 
print "Content-type: text/html" 
print 
print"""<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" 
" http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd ";> 
<html xmlns=" http://www.w3.org/1999/xhtml "; xml:lang="en" lang="en"> 
<head> 
<title>Colour Blend</title> 
<style type="text/css"> 
#blend { 
width: 10em; 
padding: 0; 
border: 1px solid black; 
margin-left: 3em; 
} 
.colourblock { 
width: 10em; 
height: 1em; 
} 
</style> 
</head> 
<body> 
<h1>Colour Blend</h1> 
<p>Here is a mix of the colours you specified:</p> 
<div id="blend">""" 

red1 = int(form["red1"].value) 
green1 = int(form["green1"].value) 
blue1 = int(form["blue1"].value) 

red2 = int(form["red2"].value) 
green2 = int(form["green2"].value) 
blue2 = int(form["blue2"].value) 

nsteps = int(form["steps"].value) 

if nsteps > 150: 
    nsteps = 150 

for i in range(0,nsteps-1): 
    fraction = (i+1.0)/nsteps 
    r = (1-fraction)*red1 + fraction*red2 
    g = (1-fraction)*green1 + fraction*green2 
    b = (1-fraction)*blue1 + fraction*blue2 
    print '<div class="colourblock" style="background-color: rgb(' + str(r) + '%,' + str(g) + '%,' + str(b) + '%'"> </div>" 
print "</body></html>" 

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