/usr/lib/python3/dist-packages/wand/drawing.py is in python3-wand 0.3.5-1.
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The module provides some vector drawing functions.
.. versionadded:: 0.3.0
"""
import collections
import ctypes
import numbers
from .api import library, MagickPixelPacket
from .color import Color
from .compat import binary, string_type, text, text_type, xrange
from .image import Image
from .resource import Resource
from .exceptions import WandLibraryVersionError
__all__ = ('FONT_METRICS_ATTRIBUTES', 'TEXT_ALIGN_TYPES',
'TEXT_DECORATION_TYPES', 'GRAVITY_TYPES', 'Drawing', 'FontMetrics')
#: (:class:`collections.Sequence`) The list of text align types.
#:
#: - ``'undefined'``
#: - ``'left'``
#: - ``'center'``
#: - ``'right'``
TEXT_ALIGN_TYPES = 'undefined', 'left', 'center', 'right'
#: (:class:`collections.Sequence`) The list of text decoration types.
#:
#: - ``'undefined'``
#: - ``'no'``
#: - ``'underline'``
#: - ``'overline'``
#: - ``'line_through'``
TEXT_DECORATION_TYPES = ('undefined', 'no', 'underline', 'overline',
'line_through')
#: (:class:`collections.Sequence`) The list of text gravity types.
#:
#: - ``'forget'``
#: - ``'north_west'``
#: - ``'north'``
#: - ``'north_east'``
#: - ``'west'``
#: - ``'center'``
#: - ``'east'``
#: - ``'south_west'``
#: - ``'south'``
#: - ``'south_east'``
#: - ``'static'``
GRAVITY_TYPES = ('forget', 'north_west', 'north', 'north_east', 'west',
'center', 'east', 'south_west', 'south', 'south_east',
'static')
#: (:class:`collections.Sequence`) The attribute names of font metrics.
FONT_METRICS_ATTRIBUTES = ('character_width', 'character_height', 'ascender',
'descender', 'text_width', 'text_height',
'maximum_horizontal_advance', 'x1', 'y1', 'x2',
'y2', 'x', 'y')
#: The tuple subtype which consists of font metrics data.
FontMetrics = collections.namedtuple('FontMetrics', FONT_METRICS_ATTRIBUTES)
class Drawing(Resource):
"""Drawing object. It maintains several vector drawing instructions
and can get drawn into zero or more :class:`~wand.image.Image` objects
by calling it.
For example, the following code draws a diagonal line to the ``image``::
with Drawing() as draw:
draw.line((0, 0), image.size)
draw(image)
:param drawing: an optional drawing object to clone.
use :meth:`clone()` method rathan than this parameter
:type drawing: :class:`Drawing`
.. versionadded:: 0.3.0
"""
c_is_resource = library.IsDrawingWand
c_destroy_resource = library.DestroyDrawingWand
c_get_exception = library.DrawGetException
c_clear_exception = library.DrawClearException
def __init__(self, drawing=None):
with self.allocate():
if not drawing:
wand = library.NewDrawingWand()
elif not isinstance(drawing, type(self)):
raise TypeError('drawing must be a wand.drawing.Drawing '
'instance, not ' + repr(drawing))
else:
wand = library.CloneDrawingWand(drawing.resource)
self.resource = wand
def clone(self):
"""Copies a drawing object.
:returns: a duplication
:rtype: :class:`Drawing`
"""
return type(self)(drawing=self)
@property
def font(self):
"""(:class:`basestring`) The current font name. It also can be set."""
return text(library.DrawGetFont(self.resource))
@font.setter
def font(self, font):
if not isinstance(font, string_type):
raise TypeError('expected a string, not ' + repr(font))
library.DrawSetFont(self.resource, binary(font))
@property
def font_size(self):
"""(:class:`numbers.Real`) The font size. It also can be set."""
return library.DrawGetFontSize(self.resource)
@font_size.setter
def font_size(self, size):
if not isinstance(size, numbers.Real):
raise TypeError('expected a numbers.Real, but got ' + repr(size))
elif size < 0.0:
raise ValueError('cannot be less then 0.0, but got ' + repr(size))
library.DrawSetFontSize(self.resource, size)
@property
def fill_color(self):
"""(:class:`~wand.color.Color`) The current color to fill.
It also can be set.
"""
pixel = library.NewPixelWand()
library.DrawGetFillColor(self.resource, pixel)
size = ctypes.sizeof(MagickPixelPacket)
buffer = ctypes.create_string_buffer(size)
library.PixelGetMagickColor(pixel, buffer)
return Color(raw=buffer)
@fill_color.setter
def fill_color(self, color):
if not isinstance(color, Color):
raise TypeError('color must be a wand.color.Color object, not ' +
repr(color))
with color:
library.DrawSetFillColor(self.resource, color.resource)
@property
def stroke_color(self):
"""(:class:`~wand.color.Color`) The current color of stroke.
It also can be set.
.. versionadded:: 0.3.3
"""
pixel = library.NewPixelWand()
library.DrawGetStrokeColor(self.resource, pixel)
size = ctypes.sizeof(MagickPixelPacket)
buffer = ctypes.create_string_buffer(size)
library.PixelGetMagickColor(pixel, buffer)
return Color(raw=buffer)
@stroke_color.setter
def stroke_color(self, color):
if not isinstance(color, Color):
raise TypeError('color must be a wand.color.Color object, not ' +
repr(color))
with color:
library.DrawSetStrokeColor(self.resource, color.resource)
@property
def stroke_width(self):
"""(:class:`numbers.Real`) The stroke width. It also can be set.
.. versionadded:: 0.3.3
"""
return library.DrawGetStrokeWidth(self.resource)
@stroke_width.setter
def stroke_width(self, width):
if not isinstance(width, numbers.Real):
raise TypeError('expected a numbers.Real, but got ' + repr(width))
elif width < 0.0:
raise ValueError('cannot be less then 0.0, but got ' + repr(width))
library.DrawSetStrokeWidth(self.resource, width)
@property
def text_alignment(self):
"""(:class:`basestring`) The current text alignment setting.
It's a string value from :const:`TEXT_ALIGN_TYPES` list.
It also can be set.
"""
text_alignment_index = library.DrawGetTextAlignment(self.resource)
if not text_alignment_index:
self.raise_exception()
return text(TEXT_ALIGN_TYPES[text_alignment_index])
@text_alignment.setter
def text_alignment(self, align):
if not isinstance(align, string_type):
raise TypeError('expected a string, not ' + repr(align))
elif align not in TEXT_ALIGN_TYPES:
raise ValueError('expected a string from TEXT_ALIGN_TYPES, not ' +
repr(align))
library.DrawSetTextAlignment(self.resource,
TEXT_ALIGN_TYPES.index(align))
@property
def text_antialias(self):
"""(:class:`bool`) The boolean value which represents whether
antialiasing is used for text rendering. It also can be set to
``True`` or ``False`` to switch the setting.
"""
result = library.DrawGetTextAntialias(self.resource)
return bool(result)
@text_antialias.setter
def text_antialias(self, value):
library.DrawSetTextAntialias(self.resource, bool(value))
@property
def text_decoration(self):
"""(:class:`basestring`) The text decoration setting, a string
from :const:`TEXT_DECORATION_TYPES` list. It also can be set.
"""
text_decoration_index = library.DrawGetTextDecoration(self.resource)
if not text_decoration_index:
self.raise_exception()
return text(TEXT_DECORATION_TYPES[text_decoration_index])
@text_decoration.setter
def text_decoration(self, decoration):
if not isinstance(decoration, string_type):
raise TypeError('expected a string, not ' + repr(decoration))
elif decoration not in TEXT_DECORATION_TYPES:
raise ValueError('expected a string from TEXT_DECORATION_TYPES, '
'not ' + repr(decoration))
library.DrawSetTextDecoration(self.resource,
TEXT_DECORATION_TYPES.index(decoration))
@property
def text_encoding(self):
"""(:class:`basestring`) The internally used text encoding setting.
Although it also can be set, but it's not encorouged.
"""
return text(library.DrawGetTextEncoding(self.resource))
@text_encoding.setter
def text_encoding(self, encoding):
if encoding is not None and not isinstance(encoding, string_type):
raise TypeError('expected a string, not ' + repr(encoding))
elif encoding is None:
# encoding specify an empty string to set text encoding
# to system's default.
encoding = b''
else:
encoding = binary(encoding)
library.DrawSetTextEncoding(self.resource, encoding)
@property
def text_interline_spacing(self):
"""(:class:`numbers.Real`) The setting of the text line spacing.
It also can be set.
"""
if library.DrawGetTextInterlineSpacing is None:
raise WandLibraryVersionError('The installed version of ImageMagick does not support this feature')
return library.DrawGetTextInterlineSpacing(self.resource)
@text_interline_spacing.setter
def text_interline_spacing(self, spacing):
if library.DrawSetTextInterlineSpacing is None:
raise WandLibraryVersionError('The installed version of ImageMagick does not support this feature')
if not isinstance(spacing, numbers.Real):
raise TypeError('expeted a numbers.Real, but got ' + repr(spacing))
library.DrawSetTextInterlineSpacing(self.resource, spacing)
@property
def text_interword_spacing(self):
"""(:class:`numbers.Real`) The setting of the word spacing.
It also can be set.
"""
return library.DrawGetTextInterwordSpacing(self.resource)
@text_interword_spacing.setter
def text_interword_spacing(self, spacing):
if not isinstance(spacing, numbers.Real):
raise TypeError('expeted a numbers.Real, but got ' + repr(spacing))
library.DrawSetTextInterwordSpacing(self.resource, spacing)
@property
def text_kerning(self):
"""(:class:`numbers.Real`) The setting of the text kerning.
It also can be set.
"""
return library.DrawGetTextKerning(self.resource)
@text_kerning.setter
def text_kerning(self, kerning):
if not isinstance(kerning, numbers.Real):
raise TypeError('expeted a numbers.Real, but got ' + repr(kerning))
library.DrawSetTextKerning(self.resource, kerning)
@property
def text_under_color(self):
"""(:class:`~wand.color.Color`) The color of a background rectangle
to place under text annotations. It also can be set.
"""
pixel = library.NewPixelWand()
library.DrawGetTextUnderColor(self.resource, pixel)
size = ctypes.sizeof(MagickPixelPacket)
buffer = ctypes.create_string_buffer(size)
library.PixelGetMagickColor(pixel, buffer)
return Color(raw=buffer)
@text_under_color.setter
def text_under_color(self, color):
if not isinstance(color, Color):
raise TypeError('expected a wand.color.Color object, not ' +
repr(color))
with color:
library.DrawSetTextUnderColor(self.resource, color.resource)
@property
def gravity(self):
"""(:class:`basestring`) The text placement gravity used when
annotating with text. It's a string from :const:`GRAVITY_TYPES`
list. It also can be set.
"""
gravity_index = library.DrawGetGravity(self.resource)
if not gravity_index:
self.raise_exception()
return text(GRAVITY_TYPES[gravity_index])
@gravity.setter
def gravity(self, value):
if not isinstance(value, string_type):
raise TypeError('expected a string, not ' + repr(value))
elif value not in GRAVITY_TYPES:
raise ValueError('expected a string from GRAVITY_TYPES, not '
+ repr(value))
library.DrawSetGravity(self.resource, GRAVITY_TYPES.index(value))
def clear(self):
library.ClearDrawingWand(self.resource)
def draw(self, image):
"""Renders the current drawing into the ``image``. You can simply
call :class:`Drawing` instance rather than calling this method.
That means the following code which calls :class:`Drawing` object
itself::
drawing(image)
is equivalent to the following code which calls :meth:`draw()` method::
drawing.draw(image)
:param image: the image to be drawn
:type image: :class:`~wand.image.Image`
"""
if not isinstance(image, Image):
raise TypeError('image must be a wand.image.Image instance, not '
+ repr(image))
res = library.MagickDrawImage(image.wand, self.resource)
if not res:
self.raise_exception()
def line(self, start, end):
"""Draws a line ``start`` to ``end``.
:param start: (:class:`~numbers.Integral`, :class:`numbers.Integral`)
pair which represents starting x and y of the line
:type start: :class:`numbers.Sequence`
:param end: (:class:`~numbers.Integral`, :class:`numbers.Integral`)
pair which represents ending x and y of the line
:type end: :class:`numbers.Sequence`
"""
start_x, start_y = start
end_x, end_y = end
library.DrawLine(self.resource,
int(start_x), int(start_y),
int(end_x), int(end_y))
def text(self, x, y, body):
"""Writes a text ``body`` into (``x``, ``y``).
:param x: the left offset where to start writing a text
:type x: :class:`numbers.Integral`
:param y: the top offset where to start writing a text
:type y: :class:`numbers.Integral`
:param body: the body string to write
:type body: :class:`basestring`
"""
if not isinstance(x, numbers.Integral) or x < 0:
exc = ValueError if x < 0 else TypeError
raise exc('x must be a natural number, not ' + repr(x))
elif not isinstance(y, numbers.Integral) or y < 0:
exc = ValueError if y < 0 else TypeError
raise exc('y must be a natural number, not ' + repr(y))
elif not isinstance(body, string_type):
raise TypeError('body must be a string, not ' + repr(body))
elif not body:
raise ValueError('body string cannot be empty')
if isinstance(body, text_type):
if self.text_encoding:
body = body.encode(self.text_encoding)
else:
body = binary(body)
body_p = ctypes.create_string_buffer(body)
library.DrawAnnotation(
self.resource, x, y,
ctypes.cast(body_p,ctypes.POINTER(ctypes.c_ubyte))
)
def get_font_metrics(self, image, text, multiline=False):
"""Queries font metrics from the given ``text``.
:param image: the image to be drawn
:type image: :class:`~wand.image.Image`
:param text: the text string for get font metrics.
:type text: :class:`basestring`
:param multiline: text is multiline or not
:type multiline: `boolean`
"""
if not isinstance(image, Image):
raise TypeError('image must be a wand.image.Image instance, not '
+ repr(image))
if not isinstance(text, string_type):
raise TypeError('text must be a string, not ' + repr(text))
if multiline:
font_metrics_f = library.MagickQueryMultilineFontMetrics
else:
font_metrics_f = library.MagickQueryFontMetrics
if isinstance(text, text_type):
if self.text_encoding:
text = text.encode(self.text_encoding)
else:
text = binary(text)
result = font_metrics_f(image.wand, self.resource, text)
args = (result[i] for i in xrange(13))
return FontMetrics(*args)
def __call__(self, image):
return self.draw(image)
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