def TRIANGLE_DEMO():
""" Draw a set of axes and a triangle. Perform a series of random transformations
on the triangle and display the results.
"""
A = Point(143, 52)
B = Point(17, 96.5)
C = Point(0, 0)
for i in range(10):
# Create random transformation
angle = random.random() * 2 * math.pi
scale = random.random() * 3
delX = (random.random() - 0.5) * 200
delY = (random.random() - 0.5) * 200
translate = Point(delX, delY)
transform = Transform(translate, angle, scale)
# Transform the triangle
A_ = transform.transform(A)
B_ = transform.transform(B)
C_ = transform.transform(C)
# From the line A-B and the transformed line A'-B', determine what the transformation was
# This should be the same as the original transformation
trans_calc = Transform.line_mapping(A, B, A_, B_)
print("Angle: {:.2f}; {:.2f}".format(rad_to_deg(angle), rad_to_deg(trans_calc.rot)))
print("Trans: ({}); ({})".format(translate, trans_calc.trans))
print("Zoom: {:.2f}; {:.2f}".format(scale, trans_calc.zoom))
# Display on image
image = Image.blank(1000, 800)
image.draw_offset = IMG_CENTER
draw_axes(image, 300)
# Draw original triangle
image.draw_line(A, B, Color.Red(), 5)
image.draw_line(C, B, Color.Red(), 5)
image.draw_line(A, C, Color.Red(), 5)
#Draw transformed triangle
image.draw_line(A_, B_, Color.Green())
image.draw_line(A_, C_, Color.Green())
image.draw_line(C_, B_, Color.Green())
# Check that the reverse transformation works properly
A__ = transform.reverse(A_)
B__ = transform.reverse(B_)
C__ = transform.reverse(C_)
# Draw the reverse transformation - this should overlap the origianl triangle
image.draw_line(A__, B__, Color.Green(), 1)
image.draw_line(A__, C__, Color.Green(), 1)
image.draw_line(C__, B__, Color.Green(), 1)
# Write the transformation on the image
image.draw_text(transform.__str__(), Point(-450, 350), Color.White(), centered=False, scale=0.5, thickness=1)
# Show the image
image.popup()
def CIRCLES_DEMO():
""" Draw a set of axes and a random set of circles. Perform a series of
random transformations on the circles.
"""
# Create a set of random circles
points = []
for i in range(10):
X = (random.random()) * 200
Y = (random.random()) * 200
points.append(Point(X, Y))
for i in range(10):
# Create random transformation
angle = random.random() * 2 * math.pi
scale = random.random() * 3
delX = (random.random() - 0.5) * 200
delY = (random.random() - 0.5) * 200
translate = Point(delX, delY)
trs = Transform(translate, angle, scale)
# Display on image
image = Image.blank(1000, 800)
image.draw_offset = IMG_CENTER
draw_axes(image, 300)
# Draw the circles and transformed circles on the image
radius = 10
for p in points:
circle = Circle(p, radius)
trans_circle = Circle(trs.transform(p), radius * trs.zoom)
image.draw_circle(circle, Color.Red())
image.draw_circle(trans_circle, Color.Blue())
# Write the transformation on the image
image.draw_text(trs.__str__(),
Point(-450, 350),
Color.White(),
centered=False,
scale=0.5,
thickness=1)
# Show the image
image.popup()
def CIRCLES_DEMO():
""" Draw a set of axes and a random set of circles. Perform a series of
random transformations on the circles.
"""
# Create a set of random circles
points = []
for i in range(10):
X = (random.random()) * 200
Y = (random.random()) * 200
points.append(Point(X, Y))
for i in range(10):
# Create random transformation
angle = random.random() * 2 * math.pi
scale = random.random() * 3
delX = (random.random() - 0.5) * 200
delY = (random.random() - 0.5) * 200
translate = Point(delX, delY)
trs = Transform(translate, angle, scale)
# Display on image
image = Image.blank(1000, 800)
image.draw_offset = IMG_CENTER
draw_axes(image, 300)
# Draw the circles and transformed circles on the image
radius = 10
for p in points:
circle = Circle(p, radius)
trans_circle = Circle(trs.transform(p), radius * trs.zoom)
image.draw_circle(circle, Color.Red())
image.draw_circle(trans_circle, Color.Blue())
# Write the transformation on the image
image.draw_text(trs.__str__(), Point(-450, 350), Color.White(), centered=False, scale=0.5, thickness=1)
# Show the image
image.popup()
def _minimise_integer_grid(self, binary_image, center, side_length):
""" Attempt to locate the square area (of the specified size, centered on the specified
center point) in the binary image which has the minimum brightness.
The datamatrix is a relatively dark area on a relative light background, so the area
corresponding to the datamatrix should have the lowest brightness.
"""
done = False
initial_transform = Transform(center.intify(), 0, 1)
best_val = 1000000000000000
best_trs = initial_transform
if self.DEBUG:
img = binary_image.to_alpha()
img = _draw_square(img, initial_transform, side_length)
img.rescale(4).popup()
count = 0
done_previous = False
while not done:
count += 1
transforms = self._make_minimisation_transforms(initial_transform,
iteration=count)
for trs in transforms:
val = self._calculate_square_metric(binary_image, trs,
side_length)
if val < best_val:
best_val = val
best_trs = trs
# if transform doesn't move for 2 iterations (one angle, one space), it
# has reached a minimum
if best_trs == initial_transform:
if done_previous:
done = True
done_previous = True
else:
done_previous = False
initial_transform = best_trs
if self.DEBUG:
img = binary_image.to_alpha()
img = _draw_square(img, initial_transform, side_length)
img.rescale(4).popup()
return best_trs
def _determine_old_to_new_transformation(self, plate, valid_barcodes):
# Get the positions of the two common barcodes in the current frame and the previous one
barcode_a = valid_barcodes[0]
barcode_b = valid_barcodes[1]
pos_a_new = barcode_a.center()
pos_b_new = barcode_b.center()
pos_a_old = None
pos_b_old = None
for slot in plate._slots:
if slot.barcode_data() == barcode_a.data():
pos_a_old = slot.barcode_position()
elif slot.barcode_data() == barcode_b.data():
pos_b_old = slot.barcode_position()
# Determine the transformation that maps the old points to the new
line_transform = Transform.line_mapping(pos_a_old, pos_b_old, pos_a_new, pos_b_new)
return line_transform
