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"""
Defines markers classes, used by a variety of renderers.
"""
# Major library imports
from numpy import array, pi
# Enthought library imports
from traits.api import HasTraits, Bool, Instance, Trait
from traitsui.api import EnumEditor
from kiva.constants import STROKE, FILL_STROKE, \
SQUARE_MARKER, DIAMOND_MARKER, CIRCLE_MARKER, \
CROSS_MARKER, TRIANGLE_MARKER, \
INVERTED_TRIANGLE_MARKER, PLUS_MARKER, DOT_MARKER, \
PIXEL_MARKER, NO_MARKER
# Local imports
from compiled_path import CompiledPath
class AbstractMarker(HasTraits):
""" Abstract class for markers.
"""
# How this marker is to be stroked (from kiva.constants).
# Since this needs to be a class variable, it can't be a trait.
draw_mode = STROKE
#draw_mode = Enum(FILL, EOF_FILL, STROKE, FILL_STROKE, EOF_FILL_STROKE)
# The kiva marker type (from kiva.constants).
kiva_marker = NO_MARKER
# Close the path object after drawing this marker?
close_path = Bool(True)
# Render the marker antialiased? Some
# markers render faster and look better if they are not anti-aliased..
antialias = Bool(True)
def add_to_path(self, path, size):
""" Adds this marker's representation to *path*, scaled appropriately
for *size*.
Parameters
----------
path : GraphicsContext
The target for drawing the marker.
size : number
Size of the marker, in pixels
"""
if self.close_path:
self._add_to_path(path, size)
path.close_path()
else:
self._add_to_path(path, size)
def get_compiled_path(self, size):
""" Returns a compiled path object that represents this marker, scaled
appropriately for *size*.
"""
raise NotImplementedError
def _add_to_path(self, path, size):
# subclasses must implement this method
raise NotImplementedError
class SquareMarker(AbstractMarker):
""" A marker that is a square.
"""
# How this marker is to be stroked. (Overrides AbstractMarker.)
draw_mode = FILL_STROKE
# The Kiva marker type. (Overrides AbstractMarker.)
kiva_marker = SQUARE_MARKER
# Do not render anti-aliased. (Overrides AbstractMarker.)
antialias = False
def _add_to_path(self, path, size):
path.rect(-size, -size, size * 2, size * 2)
class DiamondMarker(AbstractMarker):
""" A marker that is a diamond.
"""
# How this marker is to be stroked. (Overrides AbstractMarker.)
draw_mode = FILL_STROKE
# The Kiva marker type. (Overrides AbstractMarker.)
kiva_marker = DIAMOND_MARKER
# Do not render anti-aliased. (Overrides AbstractMarker.)
antialias = False
def _add_to_path(self, path, size):
path.lines(array(((0, -size),
(-size, 0),
(0, size),
(size, 0))))
class CircleMarker(AbstractMarker):
""" A marker that is a circle.
"""
# How this marker is to be stroked. (Overrides AbstractMarker.)
draw_mode = FILL_STROKE
# The Kiva marker type. (Overrides AbstractMarker.)
kiva_marker = CIRCLE_MARKER
# Array of points in a circle
circle_points = array([[ 1. , 0. ],
[ 0.966, 0.259],
[ 0.866, 0.5 ],
[ 0.707, 0.707],
[ 0.5 , 0.866],
[ 0.259, 0.966],
[ 0. , 1. ],
[-0.259, 0.966],
[-0.5 , 0.866],
[-0.707, 0.707],
[-0.866, 0.5 ],
[-0.966, 0.259],
[-1. , 0. ],
[-0.966, -0.259],
[-0.866, -0.5 ],
[-0.707, -0.707],
[-0.5 , -0.866],
[-0.259, -0.966],
[ 0. , -1. ],
[ 0.259, -0.966],
[ 0.5 , -0.866],
[ 0.707, -0.707],
[ 0.866, -0.5 ],
[ 0.966, -0.259],
[ 1. , 0. ]])
def _add_to_path(self, path, size):
if size <= 5:
pts = self.circle_points[::3] * size
elif size <= 10:
pts = self.circle_points[::2] * size
else:
pts = self.circle_points * size
path.lines(pts)
class TriangleMarker(AbstractMarker):
""" A marker that is a triangle with one apex pointing up.
"""
# How this marker is to be stroked. (Overrides AbstractMarker.)
draw_mode = FILL_STROKE
# The Kiva marker type. (Overrides AbstractMarker.)
kiva_marker = TRIANGLE_MARKER
# Do not render anti-aliased. (Overrides AbstractMarker.)
antialias = False
def _add_to_path(self, path, size):
path.lines(array(((-size, -size),
(size, -size),
(0, 0.732 * size))))
class Inverted_TriangleMarker(AbstractMarker):
""" A marker that is a triangle with one apex pointing down.
"""
# How this marker is to be stroked. (Overrides AbstractMarker.)
draw_mode = FILL_STROKE
# The Kiva marker type. (Overrides AbstractMarker.)
kiva_marker = INVERTED_TRIANGLE_MARKER
# Do not render anti-aliased. (Overrides AbstractMarker.)
antialias = False
def _add_to_path(self, path, size):
path.lines(array(((-size, size),
(size, size),
(0, -0.732 * size))))
class PlusMarker(AbstractMarker):
""" A marker that is a plus-sign.
"""
# How this marker is to be stroked. (Overrides AbstractMarker.)
draw_mode = STROKE
# The Kiva marker type. (Overrides AbstractMarker.)
kiva_marker = PLUS_MARKER
# Do not render anti-aliased. (Overrides AbstractMarker.)
antialias = False
def _add_to_path(self, path, size):
path.move_to(0, -size)
path.line_to(0, size)
path.move_to(-size, 0)
path.line_to(size, 0)
class CrossMarker(AbstractMarker):
""" A marker that is an X.
"""
# How this marker is to be stroked. (Overrides AbstractMarker.)
draw_mode = STROKE
# The Kiva marker type. (Overrides AbstractMarker.)
kiva_marker = CROSS_MARKER
# Do not render anti-aliased. (Overrides AbstractMarker.)
antialias = False
def _add_to_path(self, path, size):
path.move_to(-size, -size)
path.line_to(size, size)
path.move_to(size, -size)
path.line_to(-size, size)
class DotMarker(AbstractMarker):
""" A marker that is a dot.
"""
# How this marker is to be stroked. (Overrides AbstractMarker.)
draw_mode = FILL_STROKE
# The Kiva marker type. (Overrides AbstractMarker.)
kiva_marker = DOT_MARKER
def _add_to_path(self, path, size):
path.arc(0, 0, size, 0, 2 * pi)
class PixelMarker(AbstractMarker):
""" A marker that is a pixel.
"""
# How this marker is to be stroked. (Overrides AbstractMarker.)
draw_mode = STROKE
# The Kiva marker type. (Overrides AbstractMarker.)
kiva_marker = PIXEL_MARKER
# Do not render anti-aliased. (Overrides AbstractMarker.)
antialias = False
def _add_to_path(self, path, size):
# It's impossible to emulate a true Pixel Marker in a vector
# system, so we just draw a sub-pixel square 1.0 unit across.
path.rect(-0.5, -0.5, 1.0, 1.0)
class CustomMarker(AbstractMarker):
""" A marker that is a custom shape.
"""
# How this marker is to be stroked. (Overrides AbstractMarker.)
draw_mode = STROKE
# The Kiva marker type. (Overrides AbstractMarker.)
kiva_marker = NO_MARKER
# The custom path that represents this marker.
path = Instance(CompiledPath)
# Automatically scale **path** based on the input size parameter?
# If False, then the path does not respond to the 'size' parameter!
scale_path = Bool(True)
def _add_to_path(self, path, size):
if self.scale_path:
path.save_ctm()
path.scale_ctm(size)
path.add_path(path)
if self.scale_path:
path.restore_ctm()
def get_compiled_path(self, size):
""" Returns a path instance.
If **scale_path** is True, then the returned path is a new compiled
path that is scaled based on *size*. If **scaled_path** is False,
then this method just returns the current **path**.
"""
if self.scale_path:
newpath = CompiledPath()
newpath.scale_ctm(size)
newpath.add_path(self.path)
return newpath
else:
return self.path
# String names for marker types.
marker_names = ("square", "circle", "triangle", "inverted_triangle", "plus",
"cross", "diamond", "dot", "pixel")
# Mapping of marker string names to classes.
MarkerNameDict = {"square": SquareMarker,
"circle": CircleMarker,
"triangle": TriangleMarker,
"inverted_triangle": Inverted_TriangleMarker,
"plus": PlusMarker,
"cross": CrossMarker,
"diamond": DiamondMarker,
"dot": DotMarker,
"pixel": PixelMarker,
"custom": CustomMarker}
# A mapped trait that allows string naming of marker classes.
MarkerTrait = Trait("square", MarkerNameDict,
editor=EnumEditor(values=marker_names))
marker_trait = MarkerTrait
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