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# Copyright (C) 2007, Eduardo Silva (edsiper@gmail.com).
#
# 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 St, Fifth Floor, Boston, MA 02110-1301 USA
import gtk
class HorizontalGraphic(gtk.DrawingArea):
_MARGIN = 5
_LINE_WIDTH = 2
_GRAPH_OFFSET = 7
_range_x = []
_range_y = []
_frequency_timer = 0
def __init__(self):
gtk.DrawingArea.__init__(self)
self._width = 0
self._height = 0
self._buffer = [0]
self.connect('expose-event', self.do_expose)
self.connect('size-allocate', self._change_size_cb)
def do_expose(self, widget, event):
context = widget.window.cairo_create()
context.rectangle(0, 0, self._width - 1, self._height - 1)
context.set_source_rgb (0,0,0)
context.fill_preserve()
context.set_line_width(self._LINE_WIDTH)
if event.area.x == 0:
draw_all = True
self._draw_border_lines(context)
context.stroke()
else:
draw_all = False
context.rectangle(event.area.x, event.area.y, event.area.width, event.area.height)
context.clip()
context.set_source_rgb(1, 1, 1)
self._draw_buffer(event, widget, context, draw_all)
context.stroke()
self._updated = False
return False
def draw_value(self, percent):
redraw_all = False
if (len(self._buffer) + 1) *self._GRAPH_OFFSET >= self._width:
redraw_all = True
self._buffer = [self._buffer[-1]]
length = 1
else:
length = len(self._buffer) - 1
self._buffer.append(percent)
self._updated = True
if redraw_all:
area_x = 0
area_y = 0
height = self._height
width = self._width
else:
area_x = self._graph_x + (length*self._GRAPH_OFFSET)
area_y = self._graph_y
width = self._GRAPH_OFFSET*2
height = self._graph_height
self.queue_draw_area(area_x, area_y, width, height)
self._frequency_timer += 1
return True
def _draw_border_lines(self, context):
context.set_source_rgb(1, 1, 1)
self._draw_line(context, self._MARGIN, self._MARGIN, self._MARGIN, self._height - self._MARGIN)
self._draw_line(context, self._MARGIN, self._height - self._MARGIN - 1, self._width - self._MARGIN, self._height - self._MARGIN - 1)
def _draw_line(self, context, from_x, from_y, to_x, to_y):
context.move_to(from_x, from_y)
context.line_to(to_x, to_y)
def _draw_buffer(self, event, drwarea, context, draw_all=True):
buffer_offset = 0
freq = 1 # Frequency timer
length = len(self._buffer)
if length == 0:
return
# Context properties
context.set_line_width(self._LINE_WIDTH)
context.set_source_rgb(0,1,0)
if draw_all == True:
buffer_offset = 0
freq = 0
else:
freq = buffer_offset = (event.area.x/self._GRAPH_OFFSET)
for percent in self._buffer[buffer_offset:length]:
if buffer_offset == 0:
from_y = self._get_y(self._buffer[0])
from_x = self._graph_x
else:
from_y = self._get_y(self._buffer[buffer_offset-1])
from_x = (freq * self._GRAPH_OFFSET)
to_x = (freq+1) * self._GRAPH_OFFSET
to_y = self._get_y(percent)
self._draw_line(context, from_x, from_y, to_x, to_y)
buffer_offset+=1
freq+=1
context.stroke()
def _get_y(self, percent):
if percent==0:
percent = 1
graph_y = ((self._height)/(100 - 1))*(percent - 1)
y = self._LINE_WIDTH + abs(abs(self._height - graph_y) - self._MARGIN*2)
return int(y)
def _change_size_cb(self, widget, allocation):
self._width = allocation.width
self._height = allocation.height
self._graph_x = self._MARGIN + self._LINE_WIDTH
self._graph_y = self._MARGIN
self._graph_width = self._width - (self._MARGIN*2 + self._LINE_WIDTH)
self._graph_height = self._height - ((self._MARGIN*2 + self._LINE_WIDTH))
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