Current File : //proc/self/root/usr/share/virt-manager/virtManager/graphwidgets.py
# Copyright (C) 2013, 2014 Red Hat, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA 02110-1301 USA.
#
from gi.repository import GObject
from gi.repository import Gtk
# pylint: disable=arguments-differ
# Newer pylint can detect, but warns that overridden arguments are wrong
def rect_print(name, rect):
# For debugging
print("%s: height=%d, width=%d, x=%d, y=%d" %
(name, rect.height, rect.width, rect.x, rect.y))
def _line_helper(cairo_ct, x, y, w, h, points, for_fill=False):
ignore = w
bottom_baseline = y + h
last_was_zero = False
last_point = None
for index in range(0, len(points)):
x, y = points[index]
# If stats value == 0, we don't want to draw a line
is_zero = bool(y == bottom_baseline)
# If the line is for filling, alter the coords so that fill covers
# the same area as the parent sparkline: fill is one pixel short
# to not overwrite the spark line
if for_fill:
if index == 0:
x -= 1
elif index == (len(points) - 1):
x += 1
elif last_was_zero and is_zero:
y += 1
if index == 0:
cairo_ct.move_to(x, y)
elif last_was_zero and is_zero and not for_fill:
cairo_ct.move_to(x, y)
else:
cairo_ct.line_to(x, y)
last_point = (x, y)
last_was_zero = is_zero
return last_point
def draw_line(cairo_ct, x, y, w, h, points):
if not len(points):
return
last_point = _line_helper(cairo_ct, x, y, w, h, points)
if not last_point:
# Nothing to draw
return
# Paint the line
cairo_ct.stroke()
def draw_fill(cairo_ct, x, y, w, h, points, taper=False):
if not len(points):
return
_line_helper(cairo_ct, x, y, w, h, points, for_fill=True)
baseline_y = h + y + 1
if taper:
start_x = w + x
else:
start_x = points[-1][0]
# Box out the area to fill
cairo_ct.line_to(start_x + 1, baseline_y)
cairo_ct.line_to(x - 1, baseline_y)
# Paint the fill
cairo_ct.fill()
class CellRendererSparkline(Gtk.CellRenderer):
__gproperties__ = {
# 'name': (GObject.TYPE_*,
# nickname, long desc, (type related args), mode)
# Type related args can be min, max for int (etc.), or default value
# for strings and bool
'data_array': (GObject.TYPE_PYOBJECT, "Data Array",
"Array of data points for the graph",
GObject.PARAM_READWRITE),
'reversed': (GObject.TYPE_BOOLEAN, "Reverse data",
"Process data from back to front.",
0, GObject.PARAM_READWRITE),
}
def __init__(self):
Gtk.CellRenderer.__init__(self)
self.data_array = []
self.num_sets = 0
self.filled = True
self.reversed = False
self.rgb = None
def do_render(self, cr, widget, background_area, cell_area,
flags):
# cr : Cairo context
# widget : GtkWidget instance
# background_area : GdkRectangle: entire cell area
# cell_area : GdkRectangle: area normally rendered by cell
# flags : flags that affect rendering
# flags = Gtk.CELL_RENDERER_SELECTED, Gtk.CELL_RENDERER_PRELIT,
# Gtk.CELL_RENDERER_INSENSITIVE or Gtk.CELL_RENDERER_SORTED
ignore = widget
ignore = background_area
ignore = flags
# Indent of the gray border around the graph
BORDER_PADDING = 2
# Indent of graph from border
GRAPH_INDENT = 2
GRAPH_PAD = (BORDER_PADDING + GRAPH_INDENT)
# We don't use yalign, since we expand to the entire height
ignore = self.get_property("yalign")
xalign = self.get_property("xalign")
# Set up graphing bounds
graph_x = (cell_area.x + GRAPH_PAD)
graph_y = (cell_area.y + GRAPH_PAD)
graph_width = (cell_area.width - (GRAPH_PAD * 2))
graph_height = (cell_area.height - (GRAPH_PAD * 2))
pixels_per_point = (graph_width // max(1, len(self.data_array) - 1))
# Graph width needs to be some multiple of the amount of data points
# we have
graph_width = (pixels_per_point * max(1, len(self.data_array) - 1))
# Recalculate border width based on the amount we are graphing
border_width = graph_width + (GRAPH_INDENT * 2)
# Align the widget
empty_space = cell_area.width - border_width - (BORDER_PADDING * 2)
if empty_space:
xalign_space = int(empty_space * xalign)
cell_area.x += xalign_space
graph_x += xalign_space
cr.set_line_width(3)
# 1 == LINE_CAP_ROUND
cr.set_line_cap(1)
# Draw gray graph border
cr.set_source_rgb(0.8828125, 0.8671875, 0.8671875)
cr.rectangle(cell_area.x + BORDER_PADDING,
cell_area.y + BORDER_PADDING,
border_width,
cell_area.height - (BORDER_PADDING * 2))
cr.stroke()
# Fill in white box inside graph outline
cr.set_source_rgb(1, 1, 1)
cr.rectangle(cell_area.x + BORDER_PADDING,
cell_area.y + BORDER_PADDING,
border_width,
cell_area.height - (BORDER_PADDING * 2))
cr.fill()
def get_y(index):
baseline_y = graph_y + graph_height
if self.reversed:
n = (len(self.data_array) - index - 1)
else:
n = index
val = self.data_array[n]
y = baseline_y - (graph_height * val)
y = max(graph_y, y)
y = min(graph_y + graph_height, y)
return y
points = []
for index in range(0, len(self.data_array)):
x = int(((index * pixels_per_point) + graph_x))
y = int(get_y(index))
points.append((x, y))
cell_area.x = graph_x
cell_area.y = graph_y
cell_area.width = graph_width
cell_area.height = graph_height
# Set color to dark blue for the actual sparkline
cr.set_line_width(2)
cr.set_source_rgb(0.421875, 0.640625, 0.73046875)
draw_line(cr,
cell_area.x, cell_area.y,
cell_area.width, cell_area.height,
points)
# Set color to light blue for the fill
cr.set_source_rgba(0.71484375, 0.84765625, 0.89453125, .5)
draw_fill(cr,
cell_area.x, cell_area.y,
cell_area.width, cell_area.height,
points)
return
def do_get_size(self, widget, cell_area=None):
ignore = widget
FIXED_WIDTH = len(self.data_array)
FIXED_HEIGHT = 15
xpad = self.get_property("xpad")
ypad = self.get_property("ypad")
if cell_area:
# What to do here? haven't encountered this in practice
xoffset = 0
yoffset = 0
else:
xoffset = 0
yoffset = 0
width = ((xpad * 2) + FIXED_WIDTH)
height = ((ypad * 2) + FIXED_HEIGHT)
return (xoffset, yoffset, width, height)
# Properties are passed to use with "-" in the name, but python
# variables can't be named like that
def _sanitize_param_spec_name(self, name):
return name.replace("-", "_")
def do_get_property(self, param_spec):
name = self._sanitize_param_spec_name(param_spec.name)
return getattr(self, name)
def do_set_property(self, param_spec, value):
name = self._sanitize_param_spec_name(param_spec.name)
setattr(self, name, value)
def set_property(self, *args, **kwargs):
# Make pylint happy
return Gtk.CellRenderer.set_property(self, *args, **kwargs)
class Sparkline(Gtk.DrawingArea):
__gproperties__ = {
# 'name': (GObject.TYPE_*,
# nickname, long desc, (type related args), mode)
# Type related args can be min, max for int (etc.), or default value
# for strings and bool
'data_array': (GObject.TYPE_PYOBJECT, "Data Array",
"Array of data points for the graph",
GObject.PARAM_READWRITE),
'filled': (GObject.TYPE_BOOLEAN, 'Filled', 'the foo of the object',
1,
GObject.PARAM_READWRITE),
'num_sets': (GObject.TYPE_INT, "Number of sets",
"Number of data sets to graph",
1, 2, 1, GObject.PARAM_READWRITE),
'reversed': (GObject.TYPE_BOOLEAN, "Reverse data",
"Process data from back to front.",
0, GObject.PARAM_READWRITE),
'rgb': (GObject.TYPE_PYOBJECT, "rgb array", "List of rgb values",
GObject.PARAM_READWRITE),
}
def __init__(self):
Gtk.DrawingArea.__init__(self)
self._data_array = []
self.num_sets = 1
self.filled = True
self.reversed = False
self.rgb = []
ctxt = self.get_style_context()
ctxt.add_class(Gtk.STYLE_CLASS_ENTRY)
def set_data_array(self, val):
self._data_array = val
self.queue_draw()
def get_data_array(self):
return self._data_array
data_array = property(get_data_array, set_data_array)
def do_draw(self, cr):
cr.save()
window = self.get_window()
w = window.get_width()
h = window.get_height()
points_per_set = (len(self.data_array) // self.num_sets)
pixels_per_point = (float(w) /
(float((points_per_set - 1) or 1)))
widget = self
ctx = widget.get_style_context()
# This draws the light gray backing rectangle
Gtk.render_background(ctx, cr, 0, 0, w - 1, h - 1)
# This draws the marker ticks
max_ticks = 4
for index in range(1, max_ticks):
Gtk.render_line(ctx, cr, 1,
(h // max_ticks) * index,
w - 2,
(h // max_ticks) * index)
# Foreground-color graphics context
# This draws the black border
Gtk.render_frame(ctx, cr, 0, 0, w - 1, h - 1)
# Draw the actual sparkline
def get_y(dataset, index):
baseline_y = h
n = dataset * points_per_set
if self.reversed:
n += (points_per_set - index - 1)
else:
n += index
val = self.data_array[n]
return baseline_y - ((h - 1) * val)
cr.set_line_width(2)
for dataset in range(0, self.num_sets):
if len(self.rgb) == (self.num_sets * 3):
cr.set_source_rgb(self.rgb[(dataset * 3)],
self.rgb[(dataset * 3) + 1],
self.rgb[(dataset * 1) + 2])
points = []
for index in range(0, points_per_set):
x = index * pixels_per_point
y = get_y(dataset, index)
points.append((int(x), int(y)))
if self.num_sets == 1:
pass
draw_line(cr, 0, 0, w, h, points)
if self.filled:
# Fixes a fully filled graph from having an oddly
# tapered in end (bug 560913). Need to figure out
# what's really going on.
points = [(0, h)] + points
draw_fill(cr, 0, 0, w, h, points, taper=True)
cr.restore()
return 0
def do_size_request(self, requisition):
width = len(self.data_array) / self.num_sets
height = 20
requisition.width = width
requisition.height = height
# Properties are passed to use with "-" in the name, but python
# variables can't be named like that
def _sanitize_param_spec_name(self, name):
return name.replace("-", "_")
def do_get_property(self, param_spec):
name = self._sanitize_param_spec_name(param_spec.name)
return getattr(self, name)
def do_set_property(self, param_spec, value):
name = self._sanitize_param_spec_name(param_spec.name)
setattr(self, name, value)
# These make pylint happy
def set_property(self, *args, **kwargs):
return Gtk.DrawingArea.set_property(self, *args, **kwargs)
def show(self, *args, **kwargs):
return Gtk.DrawingArea.show(self, *args, **kwargs)
def destroy(self, *args, **kwargs):
return Gtk.DrawingArea.destroy(self, *args, **kwargs)
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