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