/usr/lib/python2.7/dist-packages/chaco/plot_label.py is in python-chaco 4.5.0-1.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 | """ Defines the PlotLabel class.
"""
from __future__ import with_statement
from enable.font_metrics_provider import font_metrics_provider
from traits.api import DelegatesTo, Enum, Instance, Str, Trait
from abstract_overlay import AbstractOverlay
from label import Label
LabelDelegate = DelegatesTo("_label")
class PlotLabel(AbstractOverlay):
""" A label used by plots.
This class wraps a simple Label instance, and delegates some traits to it.
"""
# The text of the label.
text = LabelDelegate
# The color of the label text.
color = DelegatesTo("_label")
# The font for the label text.
font = LabelDelegate
# The angle of rotation of the label.
angle = DelegatesTo("_label", "rotate_angle")
bgcolor = LabelDelegate
border_width = LabelDelegate
border_color = LabelDelegate
border_visible = LabelDelegate
margin = LabelDelegate
line_spacing = LabelDelegate
#------------------------------------------------------------------------
# Layout-related traits
#------------------------------------------------------------------------
# Horizontal justification used if the label has more horizontal space
# than it needs.
hjustify = Enum("center", "left", "right")
# Vertical justification used if the label has more vertical space than it
# needs.
vjustify = Enum("center", "bottom", "top")
# The position of this label relative to the object it is overlaying.
# Can be "top", "left", "right", "bottom", and optionally can be preceeded
# by the words "inside" or "outside", separated by a space. If "inside"
# and "outside" are not provided, then defaults to "outside".
# Examples:
# inside top
# outside right
overlay_position = Trait("outside top", Str, None)
# Should this PlotLabel modify the padding on its underlying component
# if there is not enough room to lay out the text?
# FIXME: This could cause cycles in layout, so not implemented for now
#modify_component = Bool(True)
# By default, this acts like a component and will render on the main
# "plot" layer unless its **component** attribute gets set.
draw_layer = "plot"
#------------------------------------------------------------------------
# Private traits
#------------------------------------------------------------------------
# The label has a fixed height and can be resized horizontally. (Overrides
# PlotComponent.)
resizable = "h"
# The Label instance this plot label is wrapping.
_label = Instance(Label, args=())
def __init__(self, text="", *args, **kw):
super(PlotLabel, self).__init__(*args, **kw)
self.text = text
return
def overlay(self, component, gc, view_bounds=None, mode="normal"):
""" Draws this label overlaid on another component.
Overrides AbstractOverlay.
"""
self._draw_overlay(gc, view_bounds, mode)
return
def get_preferred_size(self):
""" Returns the label's preferred size.
Overrides PlotComponent.
"""
dummy_gc = font_metrics_provider()
size = self._label.get_bounding_box(dummy_gc)
return size
def do_layout(self):
""" Tells this component to do layout.
Overrides PlotComponent.
"""
if self.component is not None:
self._layout_as_overlay()
else:
self._layout_as_component()
return
def _draw_overlay(self, gc, view_bounds=None, mode="normal"):
""" Draws the overlay layer of a component.
Overrides PlotComponent.
"""
# Perform justification and compute the correct offsets for
# the label position
width, height = self._label.get_bounding_box(gc)
if self.hjustify == "left":
x_offset = 0
elif self.hjustify == "right":
x_offset = self.width - width
elif self.hjustify == "center":
x_offset = int((self.width - width) / 2)
if self.vjustify == "bottom":
y_offset = 0
elif self.vjustify == "top":
y_offset = self.height - height
elif self.vjustify == "center":
y_offset = int((self.height - height) / 2)
with gc:
# XXX: Uncomment this after we fix kiva GL backend's clip stack
#gc.clip_to_rect(self.x, self.y, self.width, self.height)
# We have to translate to our position because the label
# tries to draw at (0,0).
gc.translate_ctm(self.x + x_offset, self.y + y_offset)
self._label.draw(gc)
return
def _draw_plot(self, gc, view_bounds=None, mode="normal"):
if self.component is None:
# We are not overlaying anything else, so we should render
# on this layer
self._draw_overlay(gc, view_bounds, mode)
def _layout_as_component(self, size=None, force=False):
pass
def _layout_as_overlay(self, size=None, force=False):
""" Lays out the label as an overlay on another component.
"""
if self.component is not None:
orientation = self.overlay_position
outside = True
if "inside" in orientation:
tmp = orientation.split()
tmp.remove("inside")
orientation = tmp[0]
outside = False
elif "outside" in orientation:
tmp = orientation.split()
tmp.remove("outside")
orientation = tmp[0]
if orientation in ("left", "right"):
self.y = self.component.y
self.height = self.component.height
if not outside:
gc = font_metrics_provider()
self.width = self._label.get_bounding_box(gc)[0]
if orientation == "left":
if outside:
self.x = self.component.outer_x
self.width = self.component.padding_left
else:
self.outer_x = self.component.x
elif orientation == "right":
if outside:
self.x = self.component.x2 + 1
self.width = self.component.padding_right
else:
self.x = self.component.x2 - self.outer_width
elif orientation in ("bottom", "top"):
self.x = self.component.x
self.width = self.component.width
if not outside:
gc = font_metrics_provider()
self.height = self._label.get_bounding_box(gc)[1]
if orientation == "bottom":
if outside:
self.y = self.component.outer_y
self.height = self.component.padding_bottom
else:
self.outer_y = self.component.y
elif orientation == "top":
if outside:
self.y = self.component.y2 + 1
self.height = self.component.padding_top
else:
self.y = self.component.y2 - self.outer_height
else:
# Leave the position alone
pass
return
def _text_changed(self, old, new):
self._label.text = new
self.do_layout()
return
def _font_changed(self, old, new):
self._label.font = new
self.do_layout()
return
def _angle_changed(self, old, new):
self._label.rotate_angle = new
self.do_layout()
return
def _overlay_position_changed(self):
self.do_layout()
def _component_changed(self, old, new):
if new:
self.draw_layer = "overlay"
else:
self.draw_layer = "plot"
return
# EOF
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