/usr/lib/python2.7/dist-packages/ginga/pilw/CanvasRenderPil.py is in python-ginga 2.6.1-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# CanvasRenderPil.py -- for rendering into a PIL Image
#
# This is open-source software licensed under a BSD license.
# Please see the file LICENSE.txt for details.
import math
from PIL import Image, ImageDraw, ImageFont
from . import PilHelp
from itertools import chain
# force registration of all canvas types
import ginga.canvas.types.all
class RenderContext(object):
def __init__(self, viewer):
self.viewer = viewer
# TODO: encapsulate this drawable
self.cr = PilHelp.PilContext(self.viewer.get_surface())
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 line width and style
self.pen = self.cr.get_pen(color, alpha=alpha)
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, color='black', alpha=1.0):
self.font = self.cr.get_font(fontname, fontsize, color,
alpha=alpha)
def text_extents(self, text):
return self.cr.text_extents(text, self.font)
def get_affine_transform(self, cx, cy, rot_deg):
x, y = 0, 0 # old center
nx, ny = cx, cy # new center
sx = sy = 1.0 # new scale
cosine = math.cos(math.radians(rot_deg))
sine = math.sin(math.radians(rot_deg))
a = cosine / sx
b = sine / sx
c = x - nx*a - ny*b
d = -sine / sy
e = cosine / sy
f = y - nx*d - ny*e
return (a, b, c, d, e, f)
##### DRAWING OPERATIONS #####
def draw_text(self, cx, cy, text, rot_deg=0.0):
wd, ht = self.cr.text_extents(text, self.font)
self.cr.text((cx, cy-ht), text, self.font, self.pen)
def draw_polygon(self, cpoints):
self.cr.polygon(cpoints, self.pen, self.brush)
def draw_circle(self, cx, cy, cradius):
self.cr.circle((cx, cy), cradius, self.pen, self.brush)
def draw_line(self, cx1, cy1, cx2, cy2):
self.cr.line((cx1, cy1), (cx2, cy2), self.pen)
def draw_path(self, cpoints):
self.cr.path(cpoints, self.pen)
class CanvasRenderer(object):
def __init__(self, viewer):
self.viewer = viewer
def setup_cr(self, shape):
cr = RenderContext(self.viewer)
cr.initialize_from_shape(shape, font=False)
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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