def test_draw_onto_canvas_random_position(self):
# Arrange
symbol = HomusSymbol("",
[[Point2D(0, 0), Point2D(100, 100)]], "",
Rectangle(Point2D(0, 0), 100, 100))
export_path = ExportPath("", "", "bitmap_random", "png", 2)
bounding_boxes = dict()
# Act
symbol.draw_onto_canvas(export_path,
stroke_thickness=2,
margin=2,
destination_width=1000,
destination_height=1000,
random_position_on_canvas=True,
bounding_boxes=bounding_boxes)
# Assert
self.assertTrue(os.path.exists(export_path.get_full_path()))
bounding_box = bounding_boxes["bitmap_random_2.png"]
self.assertEqual(bounding_box.height, 100)
self.assertEqual(bounding_box.width, 100)
self.assertNotEqual(bounding_box.left, 450)
self.assertNotEqual(bounding_box.top, 450)
self.assertNotEqual(bounding_box.right, 550)
self.assertNotEqual(bounding_box.bottom, 550)
# Cleanup
os.remove(export_path.get_full_path())
def test_initialize_with_simple_symbol(self):
# Arrange
content = "test\n23,107;30,101;"
strokes = [[Point2D(23, 107), Point2D(30, 101)]]
dimensions = Rectangle(Point2D(23, 101), 8, 7)
# Act
symbol = HomusSymbol.initialize_from_string(content)
# Assert
self.assertIsNotNone(symbol)
self.assertEqual("test", symbol.symbol_class)
self.assertEqual(content, symbol.content)
self.assertEqual(strokes, symbol.strokes)
self.assertEqual(dimensions, symbol.dimensions)
def test_draw_into_bitmap_without_larger_canvas(self):
# Arrange
symbol = HomusSymbol("",
[[Point2D(0, 0), Point2D(100, 100)]], "",
Rectangle(Point2D(0, 0), 100, 100))
export_path = ExportPath("", "", "bitmap", "png", 3)
# Act
symbol.draw_into_bitmap(export_path, stroke_thickness=3, margin=2)
# Assert
self.assertTrue(os.path.exists(export_path.get_full_path()))
# Cleanup
os.remove(export_path.get_full_path())
def initialize_from_string(content: str) -> 'CapitanSymbol':
"""
Create and initializes a new symbol from a string
:param content: The content of a symbol as read from the text-file in the form <label>:<sequence>:<image>
:return: The initialized symbol
:rtype: CapitanSymbol
"""
if content is None or content is "":
return None
parts = content.split(":")
min_x = 100000
max_x = 0
min_y = 100000
max_y = 0
symbol_name = parts[0]
sequence = parts[1]
image_numbers = parts[2].split(',')
image_data = numpy.asarray(image_numbers, numpy.uint8).reshape(
(30, 30))
stroke = []
for point_string in sequence.split(";"):
if point_string is "":
continue # Skip the last element, that is due to a trailing ; in each line
point_x, point_y = point_string.split(",")
x = float(point_x)
y = float(point_y)
stroke.append(SimplePoint2D(x, y))
max_x = max(max_x, x)
min_x = min(min_x, x)
max_y = max(max_y, y)
min_y = min(min_y, y)
dimensions = Rectangle(Point2D(min_x, min_y), int(max_x - min_x + 1),
int(max_y - min_y + 1))
return CapitanSymbol(content, stroke, image_data, symbol_name,
dimensions)
def test_draw_onto_canvas(self):
# Arrange
symbol = HomusSymbol("",
[[Point2D(0, 0), Point2D(100, 100)]], "",
Rectangle(Point2D(0, 0), 100, 100))
export_path = ExportPath("", "", "bitmap", "png", 2)
# Act
symbol.draw_onto_canvas(export_path,
stroke_thickness=2,
margin=2,
destination_width=150,
destination_height=150)
# Assert
self.assertTrue(os.path.exists(export_path.get_full_path()))
# Cleanup
os.remove(export_path.get_full_path())
def initialize_from_string(content: str) -> 'HomusSymbol':
"""
Create and initializes a new symbol from a string
:param content: The content of a symbol as read from the text-file
:return: The initialized symbol
:rtype: HomusSymbol
"""
if content is None or content is "":
return None
lines = content.splitlines()
min_x = sys.maxsize
max_x = 0
min_y = sys.maxsize
max_y = 0
symbol_name = lines[0]
strokes = []
for stroke_string in lines[1:]:
stroke = []
for point_string in stroke_string.split(";"):
if point_string is "":
continue # Skip the last element, that is due to a trailing ; in each line
point_x, point_y = point_string.split(",")
x = int(point_x)
y = int(point_y)
stroke.append(Point2D(x, y))
max_x = max(max_x, x)
min_x = min(min_x, x)
max_y = max(max_y, y)
min_y = min(min_y, y)
strokes.append(stroke)
dimensions = Rectangle(Point2D(min_x, min_y), max_x - min_x + 1,
max_y - min_y + 1)
return HomusSymbol(content, strokes, symbol_name, dimensions)
def draw_onto_canvas(self,
export_path: ExportPath,
stroke_thickness: int,
margin: int,
destination_width: int,
destination_height: int,
staff_line_spacing: int = 14,
staff_line_vertical_offsets: List[int] = None,
bounding_boxes: dict = None,
random_position_on_canvas: bool = False) -> None:
"""
Draws the symbol onto a canvas with a fixed size
:param bounding_boxes: The dictionary into which the bounding-boxes will be added of each generated image
:param export_path: The path, where the symbols should be created on disk
:param stroke_thickness:
:param margin:
:param destination_width:
:param destination_height:
:param staff_line_spacing:
:param staff_line_vertical_offsets: Offsets used for drawing staff-lines. If None provided, no staff-lines will be drawn if multiple integers are provided, multiple images will be generated
"""
width = self.dimensions.width + 2 * margin
height = self.dimensions.height + 2 * margin
if random_position_on_canvas:
# max is required for elements that are larger than the canvas,
# where the possible range for the random value would be negative
random_horizontal_offset = random.randint(
0, max(0, destination_width - width))
random_vertical_offset = random.randint(
0, max(0, destination_height - height))
offset = Point2D(
self.dimensions.origin.x - margin - random_horizontal_offset,
self.dimensions.origin.y - margin - random_vertical_offset)
else:
width_offset_for_centering = (destination_width - width) / 2
height_offset_for_centering = (destination_height - height) / 2
offset = Point2D(
self.dimensions.origin.x - margin - width_offset_for_centering,
self.dimensions.origin.y - margin -
height_offset_for_centering)
image_without_staff_lines = Image.new(
'RGB', (destination_width, destination_height),
"white") # create a new white image
draw = ImageDraw.Draw(image_without_staff_lines)
black = (0, 0, 0)
for stroke in self.strokes:
for i in range(0, len(stroke) - 1):
start_point = self.__subtract_offset(stroke[i], offset)
end_point = self.__subtract_offset(stroke[i + 1], offset)
draw.line(
(start_point.x, start_point.y, end_point.x, end_point.y),
black, stroke_thickness)
location = self.__subtract_offset(self.dimensions.origin, offset)
bounding_box_in_image = Rectangle(location, self.dimensions.width,
self.dimensions.height)
# self.draw_bounding_box(draw, location)
del draw
if staff_line_vertical_offsets is not None and staff_line_vertical_offsets:
for staff_line_vertical_offset in staff_line_vertical_offsets:
image_with_staff_lines = image_without_staff_lines.copy()
self.__draw_staff_lines_into_image(image_with_staff_lines,
stroke_thickness,
staff_line_spacing,
staff_line_vertical_offset)
file_name_with_offset = export_path.get_full_path(
staff_line_vertical_offset)
image_with_staff_lines.save(file_name_with_offset)
image_with_staff_lines.close()
if bounding_boxes is not None:
# Note that the ImageDatasetGenerator does not yield the full path, but only the class_name and
# the file_name, e.g. '3-4-Time\\1-13_3_offset_74.png', so we store only that part in the dictionary
class_and_file_name = export_path.get_class_name_and_file_path(
staff_line_vertical_offset)
bounding_boxes[class_and_file_name] = bounding_box_in_image
else:
image_without_staff_lines.save(export_path.get_full_path())
if bounding_boxes is not None:
# Note that the ImageDatasetGenerator does not yield the full path, but only the class_name and
# the file_name, e.g. '3-4-Time\\1-13_3_offset_74.png', so we store only that part in the dictionary
class_and_file_name = export_path.get_class_name_and_file_path(
)
bounding_boxes[class_and_file_name] = bounding_box_in_image
image_without_staff_lines.close()