/[cvs]/fract/mandelzoom.cgi
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revision 1.2 by teddy, Sun Feb 25 05:49:07 2001 UTC revision 1.5 by teddy, Sun Feb 25 22:54:25 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 33  else: Line 38  else:
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
# Line 67  if not (form.has_key('type') and form['t Line 69  if not (form.has_key('type') and form['t
69      else:      else:
70          ds=""          ds=""
71      if form.has_key('zoom'):      if form.has_key('zoom'):
72          zoom=atoi(form['zoom'].value)          zoom=atof(form['zoom'].value)
73          diag=diag/zoom          diag=diag/zoom
74      else:      else:
75          # If no zoom provided, don't actually zoom          # If no zoom provided, don't actually zoom
# Line 76  if not (form.has_key('type') and form['t Line 78  if not (form.has_key('type') and form['t
78      print 'ALIGN=BOTTOM HEIGHT="%s"' % (str(height)),      print 'ALIGN=BOTTOM HEIGHT="%s"' % (str(height)),
79      print 'WIDTH="%s"><P>' % (str(width))      print 'WIDTH="%s"><P>' % (str(width))
80      print 'Zoom: <SELECT NAME="zoom">'      print 'Zoom: <SELECT NAME="zoom">'
81      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]:
82          print '<OPTION',          print '<OPTION',
83          if zv==zoom:          if str(zv)==str(zoom):
84              print 'SELECTED',              print 'SELECTED',
85          print 'VALUE="%s"' % (str(zv))          print 'VALUE="%s"' % (str(zv))
86          if zv < 0:          if zv == 1:
87              print '>÷%s' % (str(-zv))              print '>Pan'
88            elif zv < 1:
89                if int(1/zv) == 1/zv:
90                    print '>Out ÷%s' % (str(int(1/zv)))
91                else:
92                    print '>Out ÷%s' % (str(1/zv))
93          else:          else:
94              print '>×%s' % (str(zv))              print '>In ×%s' % (str(zv))
95      print '</SELECT>'      print '</SELECT>'
96      print """Width: <INPUT TYPE=TEXT NAME="width" MAXLENGTH="4" SIZE="3"      print """Width: <INPUT TYPE=TEXT NAME="width" MAXLENGTH="4" SIZE="3"
97      VALUE="%s">      VALUE="%s">
# Line 92  if not (form.has_key('type') and form['t Line 99  if not (form.has_key('type') and form['t
99      VALUE="%s">      VALUE="%s">
100      Iterations: <INPUT TYPE=TEXT NAME="iter" MAXLENGTH="4" SIZE="3"      Iterations: <INPUT TYPE=TEXT NAME="iter" MAXLENGTH="4" SIZE="3"
101      VALUE="%s">      VALUE="%s">
102      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)),
103      if debug:      if debug:
104          print 'CHECKED>'          print 'CHECKED>'
105      else:      else:
106          print '>'          print '>'
107      for key in form.keys():      print '<INPUT TYPE=SUBMIT VALUE="Apply">'
108          if key not in ["zoom", "type", "debug", "image.x", "image.y", "iter", "height", "width"]:      for var in (("diag", diag), ("cx", cx), ("cy", cy)):
109              print '<INPUT TYPE=HIDDEN NAME="%s" VALUE="%s">' % (key, form[key].value)          print '<INPUT TYPE=HIDDEN NAME="%s" VALUE="%s">' % var
110      print '<INPUT TYPE=HIDDEN NAME=type VALUE="html">'      print '<INPUT TYPE=HIDDEN NAME=type VALUE="html">'
111    
112      print """</FORM>      print """</FORM>
113  </BODY></HTML>"""  </BODY></HTML>"""
114      sys.exit(0)      sys.exit(0)
115    
116  c1, c2 = (-2+2j), (2-2j)                # Corner coordinates  # Figure out c1 and c2 from width, height, diag, cx, and cy.
117    # Diagonal in pixels
118    diagp= math.sqrt(width**2 + height**2)
119    # Scale between pixels and coordinates
120    scale= diagp/diag
121    x= (width/2.0)/scale
122    y= (height/2.0)/scale
123    
124    c1= cx - x + cy - y * (0+1j)
125    c2= cx + x + cy + y * (0+1j)
126    
127    #print width, height, diag, cx, cy, diagp, scale, x, y, c1, c2
128    #sys.exit(0)
129    
130    #c1, c2 = (-2+2j), (2-2j)                # Corner coordinates
131    
132  # Force c1 to be upper left and c2 to be lower right  # Force c1 to be upper left and c2 to be lower right
133  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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