4 |
from string import atoi, atof |
from string import atoi, atof |
5 |
|
|
6 |
def handler(signum, frame): |
def handler(signum, frame): |
7 |
|
signal.alarm(0) |
8 |
raise os.error, (errno.ETIME, "Timer expired") |
raise os.error, (errno.ETIME, "Timer expired") |
9 |
|
|
10 |
signal.alarm(55) |
signal.alarm(55) |
42 |
else: |
else: |
43 |
cy= 0.0 |
cy= 0.0 |
44 |
|
|
45 |
|
# The length of the diagonal line from corner to corner. |
46 |
|
# Used as a measure of image size independent of aspect ratio. |
47 |
if form.has_key('diag'): |
if form.has_key('diag'): |
48 |
diag= atof(form['diag'].value) |
diag= atof(form['diag'].value) |
49 |
else: |
else: |
77 |
ds="&debug=on" |
ds="&debug=on" |
78 |
else: |
else: |
79 |
ds="" |
ds="" |
80 |
|
# If the user has selected a specific point on the image |
81 |
if form.has_key('image.x') and form.has_key('image.y'): |
if form.has_key('image.x') and form.has_key('image.y'): |
82 |
# Adjust cx and cy |
# Adjust cx and cy |
83 |
ix= atof(form['image.x'].value) |
ix= atof(form['image.x'].value) # Intermediate value |
84 |
iy= atof(form['image.y'].value) |
iy= atof(form['image.y'].value) # Intermediate value |
85 |
owidth= atof(form['owidth'].value) |
owidth= atof(form['owidth'].value) |
86 |
oheight= atof(form['oheight'].value) |
oheight= atof(form['oheight'].value) |
87 |
diagp= math.sqrt(owidth**2 + oheight**2) |
diagp= math.sqrt(owidth**2 + oheight**2) # Intermediate value |
88 |
scale= diagp/diag |
scale= diagp/diag # Intermediate value |
89 |
cx= (ix/scale) + (cx - (owidth / (scale*2))) |
cx= (ix/scale) + (cx - (owidth / (scale*2))) |
90 |
cy= ((oheight-iy)/scale) + (cy - (oheight / (scale*2))) |
cy= ((oheight-iy)/scale) + (cy - (oheight / (scale*2))) |
91 |
if form.has_key('zoom'): |
if form.has_key('zoom'): |
92 |
zoom=atof(form['zoom'].value) |
zoom=atof(form['zoom'].value) |
93 |
diag=diag/zoom |
diag=diag/zoom |
94 |
else: |
else: |
95 |
# If no zoom provided, don't actually zoom |
# If no zoom provided, don't actually zoom, but keep the |
96 |
|
# default of ×2 zoom. |
97 |
zoom= 2.0 |
zoom= 2.0 |
98 |
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)), |
99 |
print 'ALIGN=BOTTOM HEIGHT="%s"' % (str(height)), |
print 'ALIGN=BOTTOM HEIGHT="%s"' % (str(height)), |
132 |
After changing any settings, don't forget to change the "Zoom" setting |
After changing any settings, don't forget to change the "Zoom" setting |
133 |
to "Pan" if you don't want to zoom when applying them. |
to "Pan" if you don't want to zoom when applying them. |
134 |
</BODY></HTML>""" |
</BODY></HTML>""" |
135 |
|
# Just exit, don't calculate an image. |
136 |
sys.exit(0) |
sys.exit(0) |
137 |
|
|
138 |
|
# c1 and c2 are the coordinates of two opposite corners. |
139 |
# Figure out c1 and c2 from width, height, diag, cx, and cy. |
# Figure out c1 and c2 from width, height, diag, cx, and cy. |
140 |
|
|
141 |
# Diagonal in pixels |
# Diagonal in pixels |
142 |
diagp= math.sqrt(width**2 + height**2) |
diagp= math.sqrt(width**2 + height**2) |
143 |
# Scale between pixels and coordinates |
# Scale between pixels and coordinates |
144 |
scale= diagp/diag |
scale= diagp/diag |
145 |
|
# half the width/height in real numbers; intermediate values |
146 |
x= (width/2.0)/scale |
x= (width/2.0)/scale |
147 |
y= (height/2.0)/scale |
y= (height/2.0)/scale |
148 |
|
|
149 |
|
# The coordinates of two opposite corners |
150 |
c1= cx - x + (cy - y) * (0+1j) |
c1= cx - x + (cy - y) * (0+1j) |
151 |
c2= cx + x + (cy + y) * (0+1j) |
c2= cx + x + (cy + y) * (0+1j) |
152 |
|
|
153 |
#print width, height, diag, cx, cy, diagp, scale, x, y, c1, c2 |
#print width, height, diag, cx, cy, diagp, scale, x, y, c1, c2 |
154 |
#sys.exit(0) |
#sys.exit(0) |
155 |
|
|
|
#c1, c2 = (-2+2j), (2-2j) # Corner coordinates |
|
|
|
|
156 |
# Force c1 to be upper left and c2 to be lower right |
# Force c1 to be upper left and c2 to be lower right |
157 |
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)), \ |
158 |
complex(max(c1.real, c2.real), min(c1.imag, c2.imag)) |
complex(max(c1.real, c2.real), min(c1.imag, c2.imag)) |
159 |
|
|
160 |
|
# New image object |
161 |
mandel= Image.new("L", (width, height)) |
mandel= Image.new("L", (width, height)) |
162 |
|
# shortcut to the "Draw" method on the image object |
163 |
draw= ImageDraw.Draw(mandel) |
draw= ImageDraw.Draw(mandel) |
164 |
|
|
165 |
def drawrect((x1, y1), (x2, y2)): |
def drawrect((x1, y1), (x2, y2)): |
221 |
draw.rectangle([x1, y1m, x2, y2m], fill= color) |
draw.rectangle([x1, y1m, x2, y2m], fill= color) |
222 |
|
|
223 |
def constant(x, y): |
def constant(x, y): |
224 |
|
"Return complex number from pixel coordinates x and y." |
225 |
creal= (float(x)/xmax)*(c2.real - c1.real)+c1.real |
creal= (float(x)/xmax)*(c2.real - c1.real)+c1.real |
226 |
cimag= (float(y)/ymax)*(c2.imag - c1.imag)+c1.imag |
cimag= (float(y)/ymax)*(c2.imag - c1.imag)+c1.imag |
227 |
return complex(creal, cimag) |
return complex(creal, cimag) |
271 |
except os.error, the_error: |
except os.error, the_error: |
272 |
if the_error[0] != errno.ETIME: |
if the_error[0] != errno.ETIME: |
273 |
raise os.error, the_error |
raise os.error, the_error |
274 |
|
|
275 |
signal.alarm(0) |
signal.alarm(0) |
276 |
|
|
277 |
print "Content-type: image/png" |
print "Content-type: image/png" |