/[cvs]/fract/mandelzoom.cgi
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revision 1.2 by teddy, Sun Feb 25 05:49:07 2001 UTC revision 1.9 by teddy, Tue Jun 19 22:27:27 2001 UTC
# Line 1  Line 1 
1  #!/usr/bin/python  #!/usr/bin/python
2    
3  import cgi, Image, ImageDraw, sys, math  import cgi, Image, ImageDraw, sys, math, signal, errno, os
4  from string import atoi, atof  from string import atoi, atof
5    
6    def handler(signum, frame):
7        raise os.error, (errno.ETIME, "Timer expired")
8    
9    signal.alarm(55)
10    signal.signal(signal.SIGALRM, handler)
11    
12    # This is to get backtrace output
13  sys.stderr = sys.stdout  sys.stderr = sys.stdout
14    
15    # Uncomment this to get the backtrace more readable
16    #print "Content-Type: text/plain"
17    #print ""
18    
19  form= cgi.FieldStorage()  form= cgi.FieldStorage()
20    
21  # Image size  # Image size
22  if form.has_key('width'):  if form.has_key('width'):
23      width= atoi(form['width'].value)      width= atoi(form['width'].value)
24  else:  else:
25      width= 570      width= 480
26  if form.has_key('height'):  if form.has_key('height'):
27      height= atoi(form['height'].value)      height= atoi(form['height'].value)
28  else:  else:
29      height= 570      height= 480
30    
31  xmax, ymax = width-1, height-1          # Coordinate maximums  xmax, ymax = width-1, height-1          # Coordinate maximums
32    
# Line 23  xmax, ymax = width-1, height-1 Line 34  xmax, ymax = width-1, height-1
34  if form.has_key('cx'):  if form.has_key('cx'):
35      cx= atof(form['cx'].value)      cx= atof(form['cx'].value)
36  else:  else:
37      cx= 0      cx= 0.0
38    
39  if form.has_key('cy'):  if form.has_key('cy'):
40      cy= atof(form['cy'].value)      cy= atof(form['cy'].value)
41  else:  else:
42      cy= 0      cy= 0.0
43    
44  if form.has_key('diag'):  if form.has_key('diag'):
45      diag= atof(form['diag'].value)      diag= atof(form['diag'].value)
46  else:  else:
47      diag= math.sqrt(8)      diag= math.sqrt(32) # sqrt(4**2 + 4**2)
48    
49  debug= form.has_key('debug')  debug= form.has_key('debug')
50    
# Line 42  if form.has_key('iter'): Line 53  if form.has_key('iter'):
53  else:  else:
54      maxiter= 270      maxiter= 270
55    
 #print "Content-Type: text/plain"  
 #print ""  
   
56  # If type!=image, then output an HTML page, not an image  # If type!=image, then output an HTML page, not an image
57  if not (form.has_key('type') and form['type'].value == "image"):  if not (form.has_key('type') and form['type'].value == "image"):
58      print """Content-Type: text/html      print """Content-Type: text/html
59    
60  <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">  <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
61  <HTML><HEAD>  <HTML><HEAD>
62  <TITLE>Mandel Set Zoomer</TITLE>  <TITLE>Mandelbrot Set Zoomer</TITLE>
63  </HEAD>  </HEAD>
64  <BODY>  <BODY>
65  <H1>Mandel Set Zoomer</H1>  <H1>Mandelbrot Set Zoomer</H1>
66    
67  <FORM ACTION="mandelzoom.cgi" METHOD=GET>  <FORM ACTION="mandelzoom.cgi" METHOD=GET>
68    
# Line 66  if not (form.has_key('type') and form['t Line 74  if not (form.has_key('type') and form['t
74          ds="&debug=on"          ds="&debug=on"
75      else:      else:
76          ds=""          ds=""
77        if form.has_key('image.x') and form.has_key('image.y'):
78            # Adjust cx and cy
79            ix= atof(form['image.x'].value)
80            iy= atof(form['image.y'].value)
81            owidth= atof(form['owidth'].value)
82            oheight= atof(form['oheight'].value)
83            diagp= math.sqrt(owidth**2 + oheight**2)
84            scale= diagp/diag
85            cx= (ix/scale) + (cx - (owidth / (scale*2)))
86            cy= ((oheight-iy)/scale) + (cy - (oheight / (scale*2)))
87      if form.has_key('zoom'):      if form.has_key('zoom'):
88          zoom=atoi(form['zoom'].value)          zoom=atof(form['zoom'].value)
89          diag=diag/zoom          diag=diag/zoom
90      else:      else:
91          # If no zoom provided, don't actually zoom          # If no zoom provided, don't actually zoom
92          zoom= 2          zoom= 2.0
93      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)),
94      print 'ALIGN=BOTTOM HEIGHT="%s"' % (str(height)),      print 'ALIGN=BOTTOM HEIGHT="%s"' % (str(height)),
95      print 'WIDTH="%s"><P>' % (str(width))      print 'WIDTH="%s"><P>' % (str(width))
96      print 'Zoom: <SELECT NAME="zoom">'      print 'Zoom: <SELECT NAME="zoom">'
97      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]:
98          print '<OPTION',          print '<OPTION',
99          if zv==zoom:          if str(zv)==str(zoom):
100              print 'SELECTED',              print 'SELECTED',
101          print 'VALUE="%s"' % (str(zv))          print 'VALUE="%s"' % (str(zv))
102          if zv < 0:          if zv == 1:
103              print '>÷%s' % (str(-zv))              print '>Pan'
104            elif zv < 1:
105                print '>Out ÷%s' % (str(1/zv))
106          else:          else:
107              print '>×%s' % (str(zv))              print '>In ×%s' % (str(zv))
108      print '</SELECT>'      print '</SELECT>'
109      print """Width: <INPUT TYPE=TEXT NAME="width" MAXLENGTH="4" SIZE="3"      print """Width: <INPUT TYPE=TEXT NAME="width" MAXLENGTH="4" SIZE="3"
110      VALUE="%s">      VALUE="%s">
# Line 92  if not (form.has_key('type') and form['t Line 112  if not (form.has_key('type') and form['t
112      VALUE="%s">      VALUE="%s">
113      Iterations: <INPUT TYPE=TEXT NAME="iter" MAXLENGTH="4" SIZE="3"      Iterations: <INPUT TYPE=TEXT NAME="iter" MAXLENGTH="4" SIZE="3"
114      VALUE="%s">      VALUE="%s">
115      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)),
116      if debug:      if debug:
117          print 'CHECKED>'          print 'CHECKED>'
118      else:      else:
119          print '>'          print '>'
120      for key in form.keys():      print '<INPUT TYPE=SUBMIT VALUE="Apply">'
121          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),
122              print '<INPUT TYPE=HIDDEN NAME="%s" VALUE="%s">' % (key, form[key].value)                  ("oheight", height)):
123            print '<INPUT TYPE=HIDDEN NAME="%s" VALUE="%s">' % var
124      print '<INPUT TYPE=HIDDEN NAME=type VALUE="html">'      print '<INPUT TYPE=HIDDEN NAME=type VALUE="html">'
125    
126      print """</FORM>      print """</FORM><P>
127    After changing any settings, don't forget to change the "Zoom" setting
128    to "Pan" if you don't want to zoom when applying them.
129  </BODY></HTML>"""  </BODY></HTML>"""
130      sys.exit(0)      sys.exit(0)
131    
132  c1, c2 = (-2+2j), (2-2j)                # Corner coordinates  # Figure out c1 and c2 from width, height, diag, cx, and cy.
133    # Diagonal in pixels
134    diagp= math.sqrt(width**2 + height**2)
135    # Scale between pixels and coordinates
136    scale= diagp/diag
137    x= (width/2.0)/scale
138    y= (height/2.0)/scale
139    
140    c1= cx - x + (cy - y) * (0+1j)
141    c2= cx + x + (cy + y) * (0+1j)
142    
143    #print width, height, diag, cx, cy, diagp, scale, x, y, c1, c2
144    #sys.exit(0)
145    
146    #c1, c2 = (-2+2j), (2-2j)                # Corner coordinates
147    
148  # Force c1 to be upper left and c2 to be lower right  # Force c1 to be upper left and c2 to be lower right
149  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)), \
# Line 218  if c1.imag > 0 and c2.imag < 0: # the x Line 255  if c1.imag > 0 and c2.imag < 0: # the x
255      else:      else:
256          yto= yorig # End at x axis          yto= yorig # End at x axis
257    
258  drawrect((0, yfrom), (xmax, yto))  try:
259        drawrect((0, yfrom), (xmax, yto))
260    except os.error, the_error:
261        if the_error[0] != errno.ETIME:
262            raise os.error, the_error
263            
264    signal.alarm(0)
265    
266  print "Content-type: image/png"  print "Content-type: image/png"
267  print  print
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