/[cvs]/fract/mandelzoom.cgi
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revision 1.2 by teddy, Sun Feb 25 05:49:07 2001 UTC revision 1.7 by teddy, Mon Feb 26 05:31:47 2001 UTC
# Line 3  Line 3 
3  import cgi, Image, ImageDraw, sys, math  import cgi, Image, ImageDraw, sys, math
4  from string import atoi, atof  from string import atoi, atof
5    
6    # This is to get backtrace output
7  sys.stderr = sys.stdout  sys.stderr = sys.stdout
8    
9    # Uncomment this to get the backtrace more readable
10    #print "Content-Type: text/plain"
11    #print ""
12    
13  form= cgi.FieldStorage()  form= cgi.FieldStorage()
14    
15  # Image size  # Image size
16  if form.has_key('width'):  if form.has_key('width'):
17      width= atoi(form['width'].value)      width= atoi(form['width'].value)
18  else:  else:
19      width= 570      width= 480
20  if form.has_key('height'):  if form.has_key('height'):
21      height= atoi(form['height'].value)      height= atoi(form['height'].value)
22  else:  else:
23      height= 570      height= 480
24    
25  xmax, ymax = width-1, height-1          # Coordinate maximums  xmax, ymax = width-1, height-1          # Coordinate maximums
26    
# Line 23  xmax, ymax = width-1, height-1 Line 28  xmax, ymax = width-1, height-1
28  if form.has_key('cx'):  if form.has_key('cx'):
29      cx= atof(form['cx'].value)      cx= atof(form['cx'].value)
30  else:  else:
31      cx= 0      cx= 0.0
32    
33  if form.has_key('cy'):  if form.has_key('cy'):
34      cy= atof(form['cy'].value)      cy= atof(form['cy'].value)
35  else:  else:
36      cy= 0      cy= 0.0
37    
38  if form.has_key('diag'):  if form.has_key('diag'):
39      diag= atof(form['diag'].value)      diag= atof(form['diag'].value)
40  else:  else:
41      diag= math.sqrt(8)      diag= math.sqrt(32) # sqrt(4**2 + 4**2)
42    
43  debug= form.has_key('debug')  debug= form.has_key('debug')
44    
# Line 42  if form.has_key('iter'): Line 47  if form.has_key('iter'):
47  else:  else:
48      maxiter= 270      maxiter= 270
49    
 #print "Content-Type: text/plain"  
 #print ""  
   
50  # If type!=image, then output an HTML page, not an image  # If type!=image, then output an HTML page, not an image
51  if not (form.has_key('type') and form['type'].value == "image"):  if not (form.has_key('type') and form['type'].value == "image"):
52      print """Content-Type: text/html      print """Content-Type: text/html
53    
54  <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">  <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
55  <HTML><HEAD>  <HTML><HEAD>
56  <TITLE>Mandel Set Zoomer</TITLE>  <TITLE>Mandelbrot Set Zoomer</TITLE>
57  </HEAD>  </HEAD>
58  <BODY>  <BODY>
59  <H1>Mandel Set Zoomer</H1>  <H1>Mandelbrot Set Zoomer</H1>
60    
61  <FORM ACTION="mandelzoom.cgi" METHOD=GET>  <FORM ACTION="mandelzoom.cgi" METHOD=GET>
62    
# Line 66  if not (form.has_key('type') and form['t Line 68  if not (form.has_key('type') and form['t
68          ds="&debug=on"          ds="&debug=on"
69      else:      else:
70          ds=""          ds=""
71        if form.has_key('image.x') and form.has_key('image.y'):
72            # Adjust cx and cy
73            ix= atof(form['image.x'].value)
74            iy= atof(form['image.y'].value)
75            owidth= atof(form['owidth'].value)
76            oheight= atof(form['oheight'].value)
77            diagp= math.sqrt(owidth**2 + oheight**2)
78            scale= diagp/diag
79            cx= (ix/scale) + (cx - (owidth / (scale*2)))
80            cy= ((oheight-iy)/scale) + (cy - (oheight / (scale*2)))
81      if form.has_key('zoom'):      if form.has_key('zoom'):
82          zoom=atoi(form['zoom'].value)          zoom=atof(form['zoom'].value)
83          diag=diag/zoom          diag=diag/zoom
84      else:      else:
85          # If no zoom provided, don't actually zoom          # If no zoom provided, don't actually zoom
86          zoom= 2          zoom= 2.0
87      print 'SRC="mandelzoom.cgi?type=image&width=%s&height=%s&iter=%s%s&diag=%s&cx=%s&cy=%s"' % (str(width), str(height), str(maxiter), ds, str(diag), str(cx), str(cy)),      print 'SRC="mandelzoom.cgi?type=image&width=%s&height=%s&iter=%s%s&diag=%s&cx=%s&cy=%s"' % (str(width), str(height), str(maxiter), ds, str(diag), str(cx), str(cy)),
88      print 'ALIGN=BOTTOM HEIGHT="%s"' % (str(height)),      print 'ALIGN=BOTTOM HEIGHT="%s"' % (str(height)),
89      print 'WIDTH="%s"><P>' % (str(width))      print 'WIDTH="%s"><P>' % (str(width))
90      print 'Zoom: <SELECT NAME="zoom">'      print 'Zoom: <SELECT NAME="zoom">'
91      for zv in [-5, -3, -2, 1, 2, 3, 5]:      for zv in [1.0/5, 1.0/3, 1.0/2, 1.0/1.5, 1.0, 1.5, 2.0, 3.0, 5.0]:
92          print '<OPTION',          print '<OPTION',
93          if zv==zoom:          if str(zv)==str(zoom):
94              print 'SELECTED',              print 'SELECTED',
95          print 'VALUE="%s"' % (str(zv))          print 'VALUE="%s"' % (str(zv))
96          if zv < 0:          if zv == 1:
97              print '>÷%s' % (str(-zv))              print '>Pan'
98            elif zv < 1:
99                print '>Out ÷%s' % (str(1/zv))
100          else:          else:
101              print '>×%s' % (str(zv))              print '>In ×%s' % (str(zv))
102      print '</SELECT>'      print '</SELECT>'
103      print """Width: <INPUT TYPE=TEXT NAME="width" MAXLENGTH="4" SIZE="3"      print """Width: <INPUT TYPE=TEXT NAME="width" MAXLENGTH="4" SIZE="3"
104      VALUE="%s">      VALUE="%s">
# Line 92  if not (form.has_key('type') and form['t Line 106  if not (form.has_key('type') and form['t
106      VALUE="%s">      VALUE="%s">
107      Iterations: <INPUT TYPE=TEXT NAME="iter" MAXLENGTH="4" SIZE="3"      Iterations: <INPUT TYPE=TEXT NAME="iter" MAXLENGTH="4" SIZE="3"
108      VALUE="%s">      VALUE="%s">
109      Debug mode: <INPUT TYPE=CHECKBOX NAME="debug" """ % (str(width), str(height), str(maxiter))      Debug mode: <INPUT TYPE=CHECKBOX NAME="debug" """ % (str(width), str(height), str(maxiter)),
110      if debug:      if debug:
111          print 'CHECKED>'          print 'CHECKED>'
112      else:      else:
113          print '>'          print '>'
114      for key in form.keys():      print '<INPUT TYPE=SUBMIT VALUE="Apply">'
115          if key not in ["zoom", "type", "debug", "image.x", "image.y", "iter", "height", "width"]:      for var in (("diag", diag), ("cx", cx), ("cy", cy), ("owidth", width),
116              print '<INPUT TYPE=HIDDEN NAME="%s" VALUE="%s">' % (key, form[key].value)                  ("oheight", height)):
117            print '<INPUT TYPE=HIDDEN NAME="%s" VALUE="%s">' % var
118      print '<INPUT TYPE=HIDDEN NAME=type VALUE="html">'      print '<INPUT TYPE=HIDDEN NAME=type VALUE="html">'
119    
120      print """</FORM>      print """</FORM>
121  </BODY></HTML>"""  </BODY></HTML>"""
122      sys.exit(0)      sys.exit(0)
123    
124  c1, c2 = (-2+2j), (2-2j)                # Corner coordinates  # Figure out c1 and c2 from width, height, diag, cx, and cy.
125    # Diagonal in pixels
126    diagp= math.sqrt(width**2 + height**2)
127    # Scale between pixels and coordinates
128    scale= diagp/diag
129    x= (width/2.0)/scale
130    y= (height/2.0)/scale
131    
132    c1= cx - x + (cy - y) * (0+1j)
133    c2= cx + x + (cy + y) * (0+1j)
134    
135    #print width, height, diag, cx, cy, diagp, scale, x, y, c1, c2
136    #sys.exit(0)
137    
138    #c1, c2 = (-2+2j), (2-2j)                # Corner coordinates
139    
140  # Force c1 to be upper left and c2 to be lower right  # Force c1 to be upper left and c2 to be lower right
141  c1, c2= complex(min(c1.real, c2.real), max(c1.imag, c2.imag)), \  c1, c2= complex(min(c1.real, c2.real), max(c1.imag, c2.imag)), \
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