def computeTransformMatrix(transformList):
""" compute the transform matrix that is the concatenation of all transforms in the
specifed transformList
"""
transformMatrix = shapes.nullTransform()
for transform in transformList:
if not 'transform' in transform:
raise InvalidTransform()
if transform['transform'] is 'translate':
transformMatrix = shapes.mmult(
transformMatrix,
shapes.translate(transform["tx"], transform["ty"]))
elif transform['transform'] is 'rotate':
transformMatrix = shapes.mmult(
transformMatrix,
shapes.translate(transform['cx'], transform['cy']))
transformMatrix = shapes.mmult(transformMatrix,
shapes.rotate(transform["theta"]))
transformMatrix = shapes.mmult(
transformMatrix,
shapes.translate(-1.0 * transform['cx'],
-1.0 * transform['cy']))
elif transform['transform'] is 'scale':
transformMatrix = shapes.mmult(
transformMatrix, shapes.scale(transform['sx'],
transform['sy']))
else:
raise InvalidTransform(transform['transform'])
return transformMatrix
def bezier_arc_from_end_points(x1, y1, rx, ry, phi, fA, fS, x2, y2):
if phi:
# Our box bezier arcs can't handle rotations directly
# move to a well known point, eliminate phi and transform the other point
mx = mmult(rotate(-phi), translate(-x1, -y1))
tx2, ty2 = transformPoint(mx, (x2, y2))
# Convert to box form in unrotated coords
cx, cy, rx, ry, start_ang, extent = end_point_to_center_parameters(
0, 0, tx2, ty2, fA, fS, rx, ry
)
bp = bezier_arc_from_centre(cx, cy, rx, ry, start_ang, extent)
# Re-rotate by the desired angle and add back the translation
mx = mmult(translate(x1, y1), rotate(phi))
res = []
for x1, y1, x2, y2, x3, y3, x4, y4 in bp:
res.append(
transformPoint(mx, (x1, y1)) + transformPoint(mx, (x2, y2)) +
transformPoint(mx, (x3, y3)) + transformPoint(mx, (x4, y4))
)
return res
else:
cx, cy, rx, ry, start_ang, extent = end_point_to_center_parameters(
x1, y1, x2, y2, fA, fS, rx, ry
)
return bezier_arc_from_centre(cx, cy, rx, ry, start_ang, extent)
def bezier_arc_from_end_points(x1, y1, rx, ry, phi, fA, fS, x2, y2):
if (x1 == x2 and y1 == y2):
# From https://www.w3.org/TR/SVG/implnote.html#ArcImplementationNotes:
# If the endpoints (x1, y1) and (x2, y2) are identical, then this is
# equivalent to omitting the elliptical arc segment entirely.
return []
if phi:
# Our box bezier arcs can't handle rotations directly
# move to a well known point, eliminate phi and transform the other point
mx = mmult(rotate(-phi), translate(-x1, -y1))
tx2, ty2 = transformPoint(mx, (x2, y2))
# Convert to box form in unrotated coords
cx, cy, rx, ry, start_ang, extent = end_point_to_center_parameters(
0, 0, tx2, ty2, fA, fS, rx, ry)
bp = bezier_arc_from_centre(cx, cy, rx, ry, start_ang, extent)
# Re-rotate by the desired angle and add back the translation
mx = mmult(translate(x1, y1), rotate(phi))
res = []
for x1, y1, x2, y2, x3, y3, x4, y4 in bp:
res.append(
transformPoint(mx, (x1, y1)) + transformPoint(mx, (x2, y2)) +
transformPoint(mx, (x3, y3)) + transformPoint(mx, (x4, y4)))
return res
else:
cx, cy, rx, ry, start_ang, extent = end_point_to_center_parameters(
x1, y1, x2, y2, fA, fS, rx, ry)
return bezier_arc_from_centre(cx, cy, rx, ry, start_ang, extent)
def getCaptcha(n=5,fontName='Courier',fontSize=14,text=None,fillColor=None):
'''return n random chars in a string and in a byte string structured
as a GIF image'''
from reportlab.graphics.shapes import Drawing, Group, String, \
rotate, skewX, skewY, mmult, translate, Rect
if not text:
from random import randint, uniform
text=''.join([_allowed[randint(0,_mx)] for i in range(n)])
else:
uniform = lambda l,h: 0.5*(l+h)
n = len(text)
baseline = 0
x = 0
G0 = Group()
for c in text:
x += 1
A = translate(x,uniform(baseline-5,baseline+5))
A = mmult(A,rotate(uniform(-15,15)))
A = mmult(A,skewX(uniform(-8,8)))
A = mmult(A,skewY(uniform(-8,8)))
G = Group(transform=A)
G.add(String(0,0,c,fontname=fontName,fontSize=fontSize))
G0.add(G)
x0,y0,x1,y1 = G0.getBounds()
x = 1+x1
G0.transform=translate(2-x0,2-y0)
W = 4+x1-x0
H = 4+y1-y0
D = Drawing(W,H)
if fillColor:
from reportlab.lib.colors import toColor
D.add(Rect(0,0,W,H, fillColor = toColor(fillColor),strokeColor=None))
D.add(G0)
return text, D.asString('gif')
def bezier_arc_from_end_points(x1, y1, rx, ry, phi, fA, fS, x2, y2):
if phi:
# Our box bezier arcs can't handle rotations directly
# move to a well known point, eliminate phi and transform the other point
mx = mmult(rotate(-phi), translate(-x1, -y1))
tx2, ty2 = transformPoint(mx, (x2, y2))
# Convert to box form in unrotated coords
cx, cy, rx, ry, start_ang, extent = end_point_to_center_parameters(
0, 0, tx2, ty2, fA, fS, rx, ry
)
bp = bezier_arc_from_centre(cx, cy, rx, ry, start_ang, extent)
# Re-rotate by the desired angle and add back the translation
mx = mmult(translate(x1, y1), rotate(phi))
res = []
for x1, y1, x2, y2, x3, y3, x4, y4 in bp:
res.append(
transformPoint(mx, (x1, y1)) + transformPoint(mx, (x2, y2)) +
transformPoint(mx, (x3, y3)) + transformPoint(mx, (x4, y4))
)
return res
else:
cx, cy, rx, ry, start_ang, extent = end_point_to_center_parameters(
x1, y1, x2, y2, fA, fS, rx, ry
)
return bezier_arc_from_centre(cx, cy, rx, ry, start_ang, extent)
def computeTransformMatrix(transformList):
""" compute the transform matrix that is the concatenation of all transforms in the
specifed transformList
"""
transformMatrix = shapes.nullTransform()
for transform in transformList:
if not 'transform' in transform:
raise InvalidTransform()
if transform['transform'] is 'translate':
transformMatrix = shapes.mmult(transformMatrix, shapes.translate(transform["tx"], transform["ty"]))
elif transform['transform'] is 'rotate':
transformMatrix = shapes.mmult(transformMatrix, shapes.translate(transform['cx'], transform['cy']))
transformMatrix = shapes.mmult(transformMatrix, shapes.rotate(transform["theta"]))
transformMatrix = shapes.mmult(transformMatrix, shapes.translate(-1.0 * transform['cx'], -1.0 * transform['cy']))
elif transform['transform'] is 'scale':
transformMatrix = shapes.mmult(transformMatrix, shapes.scale(transform['sx'], transform['sy']))
else:
raise InvalidTransform(transform['transform'])
return transformMatrix
