/usr/lib/python2.7/dist-packages/enable/label.py is in python-enable 4.3.0-2.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 | """ Defines the Label class.
"""
from __future__ import with_statement
# Major library imports
from math import pi
from numpy import asarray
# Enthought library imports
from kiva.constants import FILL, STROKE
from kiva.trait_defs.kiva_font_trait import KivaFont
from traits.api import Bool, Enum, Float, HasTraits, Int, \
List, Str
# Local, relative imports
from colors import black_color_trait, transparent_color_trait
from component import Component
class Label(Component):
""" A text label """
# The label text. Carriage returns (\n) are always connverted into
# line breaks.
text = Str
# The angle of rotation of the label. Only multiples of 90 are supported.
rotate_angle = Float(0)
# The color of the label text.
color = black_color_trait
# The background color of the label.
bgcolor = transparent_color_trait
# The width of the label border. If it is 0, then it is not shown.
border_width = Int(0)
# The color of the border.
border_color = black_color_trait
# The font of the label text.
font = KivaFont("modern 10")
# Number of pixels of margin around the label, for both X and Y dimensions.
margin = Int(2)
# Number of pixels of spacing between lines of text.
line_spacing = Int(5)
# The horizontal placement of text within the bounds of the label
hjustify = Enum("left", "center", "right")
# The vertical placement of text within the bounds of the label
vjustify = Enum("bottom", "center", "top")
# By default, labels are not resizable
resizable = ""
#------------------------------------------------------------------------
# Private traits
#------------------------------------------------------------------------
_bounding_box = List()
_position_cache_valid = Bool(False)
def __init__(self, text = "", **kwtraits):
if 'text' not in kwtraits:
kwtraits['text'] = text
HasTraits.__init__(self, **kwtraits)
self._bounding_box = [0,0]
return
def _calc_line_positions(self, gc):
if not self._position_cache_valid:
with gc:
gc.set_font(self.font)
# The bottommost line starts at postion (0,0).
x_pos = []
y_pos = []
self._bounding_box = [0,0]
margin = self.margin
prev_y_pos = margin
prev_y_height = -self.line_spacing
max_width = 0
for line in self.text.split("\n")[::-1]:
if line != "":
(width, height, descent, leading) = gc.get_full_text_extent(line)
if width > max_width:
max_width = width
new_y_pos = prev_y_pos + prev_y_height - descent + self.line_spacing
else:
# For blank lines, we use the height of the previous line, if there
# is one. The width is 0.
leading = 0
if prev_y_height != -self.line_spacing:
new_y_pos = prev_y_pos + prev_y_height + self.line_spacing
height = prev_y_height
else:
new_y_pos = prev_y_pos
height = 0
x_pos.append(-leading + margin)
y_pos.append(new_y_pos)
prev_y_pos = new_y_pos
prev_y_height = height
width = max_width + 2*margin + 2*self.border_width
height = prev_y_pos + prev_y_height + margin + 2*self.border_width
self._bounding_box = [width, height]
if self.hjustify == "left":
x_pos = x_pos[::-1]
else:
x_pos = asarray(x_pos[::-1], dtype=float)
if self.hjustify == "center":
x_pos += (self.width - width) / 2.0
elif self.hjustify == "right":
x_pos += self.width - width
self._line_xpos = x_pos
if self.vjustify == "bottom":
y_pos = y_pos[::-1]
else:
y_pos = asarray(y_pos[::-1], dtype=float)
if self.vjustify == "center":
y_pos += (self.height - height) / 2.0
elif self.vjustify == "top":
y_pos += self.height - height
self._line_ypos = y_pos
self._position_cache_valid = True
return
def get_width_height(self, gc):
""" Returns the width and height of the label, in the rotated frame of
reference.
"""
self._calc_line_positions(gc)
width, height = self._bounding_box
return width, height
def get_bounding_box(self, gc):
""" Returns a rectangular bounding box for the Label as (width,height).
"""
# FIXME: Need to deal with non 90 deg rotations
width, height = self.get_width_height(gc)
if self.rotate_angle in (90.0, 270.0):
return (height, width)
elif self.rotate_angle in (0.0, 180.0):
return (width, height)
else:
raise NotImplementedError
def get_bounding_poly(self, gc):
"""
Returns a list [(x0,y0), (x1,y1),...] of tuples representing a polygon
that bounds the label.
"""
raise NotImplementedError
def _draw_mainlayer(self, gc, view_bounds=None, mode="normal"):
""" Draws the label.
This method assumes the graphics context has been translated to the
correct position such that the origin is at the lower left-hand corner
of this text label's box.
"""
# For this version we're not supporting rotated text.
# temp modified for only one line
self._calc_line_positions(gc)
with gc:
gc.translate_ctm(*self.position)
# Draw border and fill background
width, height = self._bounding_box
if self.bgcolor != "transparent":
gc.set_fill_color(self.bgcolor_)
gc.draw_rect((0, 0, width, height), FILL)
if self.border_width > 0:
gc.set_stroke_color(self.border_color_)
gc.set_line_width(self.border_width)
border_offset = (self.border_width-1)/2.0
gc.draw_rect((border_offset, border_offset,
width-2*border_offset, height-2*border_offset), STROKE)
gc.set_fill_color(self.color_)
gc.set_stroke_color(self.color_)
gc.set_font(self.font)
if self.font.size<=8.0:
gc.set_antialias(0)
else:
gc.set_antialias(1)
gc.rotate_ctm(pi/180.0*self.rotate_angle)
#margin = self.margin
lines = self.text.split("\n")
gc.translate_ctm(self.border_width, self.border_width)
width, height = self.get_width_height(gc)
for i, line in enumerate(lines):
if line == "":
continue
if self.rotate_angle==90. or self.rotate_angle==270.:
x_offset = round(self._line_ypos[i])
# this should really be "... - height/2" but
# that looks wrong
y_offset = round(self._line_xpos[i] - height)
else:
x_offset = round(self._line_xpos[i])
y_offset = round(self._line_ypos[i])
gc.set_text_position(0, 0)
gc.translate_ctm(x_offset, y_offset)
gc.show_text(line)
gc.translate_ctm(-x_offset, -y_offset)
return
def _font_changed(self):
self._position_cache_valid = False
def _margin_changed(self):
self._position_cache_valid = False
def _text_changed(self):
self._position_cache_valid = False
def _rotate_angle_changed(self):
self._position_cache_valid = False
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