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