/usr/lib/python2.7/dist-packages/ginga/mplw/CanvasRenderMpl.py is in python-ginga 2.6.1-2.
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# CanvasRenderMpl.py -- for rendering into a ImageViewMpl widget
#
# Eric Jeschke (eric@naoj.org)
#
# Copyright (c) Eric R. Jeschke. All rights reserved.
# This is open-source software licensed under a BSD license.
# Please see the file LICENSE.txt for details.
import matplotlib.patches as patches
import matplotlib.lines as lines
import matplotlib.text as text
from matplotlib.path import Path as MplPath
import numpy
from . import MplHelp
from ginga.canvas.mixins import *
# force registration of all canvas types
import ginga.canvas.types.all
class RenderContext(object):
def __init__(self, viewer):
self.viewer = viewer
self.shape = None
# TODO: encapsulate this drawable
self.cr = MplHelp.MplContext(self.viewer.ax_util)
self.pen = None
self.brush = None
self.font = None
def set_line_from_shape(self, shape):
# TODO: support line width and style
alpha = getattr(shape, 'alpha', 1.0)
self.pen = self.cr.get_pen(shape.color, alpha=alpha)
def set_fill_from_shape(self, shape):
fill = getattr(shape, 'fill', False)
if fill:
if hasattr(shape, 'fillcolor') and shape.fillcolor:
color = shape.fillcolor
else:
color = shape.color
alpha = getattr(shape, 'alpha', 1.0)
alpha = getattr(shape, 'fillalpha', alpha)
self.brush = self.cr.get_brush(color, alpha=alpha)
else:
self.brush = None
def set_font_from_shape(self, shape):
if hasattr(shape, 'font'):
if hasattr(shape, 'fontsize') and shape.fontsize is not None:
fontsize = shape.fontsize
else:
fontsize = shape.scale_font(self.viewer)
alpha = getattr(shape, 'alpha', 1.0)
self.font = self.cr.get_font(shape.font, fontsize, shape.color,
alpha=alpha)
else:
self.font = None
def initialize_from_shape(self, shape, line=True, fill=True, font=True):
if line:
self.set_line_from_shape(shape)
if fill:
self.set_fill_from_shape(shape)
if font:
self.set_font_from_shape(shape)
def set_line(self, color, alpha=1.0, linewidth=1, style='solid'):
# TODO: support style
self.pen = self.cr.get_pen(color, alpha=alpha, linewidth=linewidth,
linestyle=style)
def set_fill(self, color, alpha=1.0):
if color is None:
self.brush = None
else:
self.brush = self.cr.get_brush(color, alpha=alpha)
def set_font(self, fontname, fontsize):
self.font = self.cr.get_font(fontname, fontsize, 'black',
alpha=1.0)
def text_extents(self, text):
return self.cr.text_extents(text, self.font)
##### DRAWING OPERATIONS #####
def draw_text(self, cx, cy, text, rot_deg=0.0):
fontdict = self.font.get_fontdict()
self.cr.axes.text(cx, cy, text, fontdict=fontdict)
def draw_polygon(self, cpoints):
self.cr.init(closed=True, transform=None)
self.cr.update_patch(self.pen, self.brush)
xy = numpy.array(cpoints)
p = patches.Polygon(xy, **self.cr.kwdargs)
self.cr.axes.add_patch(p)
def draw_circle(self, cx, cy, cradius):
self.cr.init(radius=cradius, transform=None)
self.cr.update_patch(self.pen, self.brush)
xy = (cx, cy)
p = patches.Circle(xy, **self.cr.kwdargs)
self.cr.axes.add_patch(p)
def draw_bezier_curve(self, verts):
self.cr.init(transform=None)
self.cr.update_patch(self.pen, None)
codes = [ MplPath.MOVETO,
MplPath.CURVE4, MplPath.CURVE4, MplPath.CURVE4,
]
path = MplPath(verts, codes)
p = patches.PathPatch(path, **self.cr.kwdargs)
self.cr.axes.add_patch(p)
def draw_ellipse_bezier(self, verts):
self.cr.init(transform=None)
self.cr.update_patch(self.pen, self.brush)
# draw 4 bezier curves to make the ellipse
codes = [ MplPath.MOVETO,
MplPath.CURVE4, MplPath.CURVE4, MplPath.CURVE4,
MplPath.CURVE4, MplPath.CURVE4, MplPath.CURVE4,
MplPath.CURVE4, MplPath.CURVE4, MplPath.CURVE4,
MplPath.CURVE4, MplPath.CURVE4, MplPath.CURVE4,
]
path = MplPath(verts, codes)
p = patches.PathPatch(path, **self.cr.kwdargs)
self.cr.axes.add_patch(p)
def draw_line(self, cx1, cy1, cx2, cy2):
self.cr.init(transform=None)
self.cr.update_line(self.pen)
l = lines.Line2D((cx1, cx2), (cy1, cy2), **self.cr.kwdargs)
self.cr.axes.add_line(l)
def draw_path(self, cpoints):
self.cr.init(closed=False, transform=None)
self.cr.update_patch(self.pen, None)
xy = numpy.array(cpoints)
p = patches.Polygon(xy, **self.cr.kwdargs)
self.cr.axes.add_patch(p)
class CanvasRenderer(object):
def __init__(self, viewer):
self.viewer = viewer
def setup_cr(self, shape):
cr = RenderContext(self.viewer)
cr.initialize_from_shape(shape)
return cr
def get_dimensions(self, shape):
cr = self.setup_cr(shape)
cr.set_font_from_shape(shape)
return cr.text_extents(shape.text)
#END
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