/[cvs]/fract/mandelzoom.cgi
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revision 1.1 by teddy, Sat Feb 24 21:36:47 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  import cgi, Image, ImageDraw, sys, math, signal, errno, os
4  from string import atoi  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
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    
33    # Complex number in center of image is (cx+cy*j)
34    if form.has_key('cx'):
35        cx= atof(form['cx'].value)
36    else:
37        cx= 0.0
38    
39    if form.has_key('cy'):
40        cy= atof(form['cy'].value)
41    else:
42        cy= 0.0
43    
44    if form.has_key('diag'):
45        diag= atof(form['diag'].value)
46    else:
47        diag= math.sqrt(32) # sqrt(4**2 + 4**2)
48    
49  debug= form.has_key('debug')  debug= form.has_key('debug')
 if debug:  
     del form['debug']  
50    
51  if form.has_key('iter'):  if form.has_key('iter'):
52      maxiter=atoi(form['iter'].value)      maxiter= atoi(form['iter'].value)
     del form['iter']  
53  else:  else:
54      maxiter= 270      maxiter= 270
55    
56  sys.stderr = sys.stdout  # If type!=image, then output an HTML page, not an image
57  print "Content-Type: text/plain"  if not (form.has_key('type') and form['type'].value == "image"):
 print ""  
   
 # If type==html, then output an HTML page, not an image  
 if form.has_key('type') and form['type'].value == "html":  
     del form['type']  
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    
69  <!-- implies TYPE=SUBMIT -->  <!-- implies TYPE=SUBMIT -->"""
70      <INPUT TYPE=IMAGE NAME="image" SRC="mandelzoom.cgi?%s" ALIGN=BOTTOM      print '<INPUT TYPE=IMAGE NAME="image"',
71      HEIGHT="%s" WIDTH="%s">      print 'WIDTH="%s"' % (str(width)),
72        print 'HEIGHT="%s"' % (str(height)),
73        if debug:
74            ds="&debug=on"
75        else:
76            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'):
88            zoom=atof(form['zoom'].value)
89            diag=diag/zoom
90        else:
91            # If no zoom provided, don't actually zoom
92            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)),
94        print 'ALIGN=BOTTOM HEIGHT="%s"' % (str(height)),
95        print 'WIDTH="%s"><P>' % (str(width))
96        print 'Zoom: <SELECT NAME="zoom">'
97        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',
99            if str(zv)==str(zoom):
100                print 'SELECTED',
101            print 'VALUE="%s"' % (str(zv))
102            if zv == 1:
103                print '>Pan'
104            elif zv < 1:
105                print '>Out ÷%s' % (str(1/zv))
106            else:
107                print '>In ×%s' % (str(zv))
108        print '</SELECT>'
109        print """Width: <INPUT TYPE=TEXT NAME="width" MAXLENGTH="4" SIZE="3"
110        VALUE="%s">
111        Height: <INPUT TYPE=TEXT NAME="height" MAXLENGTH="4" SIZE="3"
112        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" %s>"""      Debug mode: <INPUT TYPE=CHECKBOX NAME="debug" """ % (str(width), str(height), str(maxiter)),
116      for key in form.keys():      if debug:
117          print '<INPUT TYPE=HIDDEN NAME="%s" VALUE="%s">' % (key, form[key].value)          print 'CHECKED>'
118        else:
119      print """</FORM>          print '>'
120        print '<INPUT TYPE=SUBMIT VALUE="Apply">'
121        for var in (("diag", diag), ("cx", cx), ("cy", cy), ("owidth", width),
122                    ("oheight", height)):
123            print '<INPUT TYPE=HIDDEN NAME="%s" VALUE="%s">' % var
124        print '<INPUT TYPE=HIDDEN NAME=type VALUE="html">'
125    
126        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 170  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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