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#
# Copyright 2008, 2009 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# GNU Radio 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 3, or (at your option)
# any later version.
#
# GNU Radio 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 GNU Radio; see the file COPYING. If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
#
import wx
from grid_plotter_base import grid_plotter_base
from OpenGL import GL
import common
import numpy
import gltext
import math
LEGEND_TEXT_FONT_SIZE = 8
LEGEND_BOX_PADDING = 3
MIN_PADDING = 35, 10, 0, 0 #top, right, bottom, left
#constants for the waveform storage
SAMPLES_KEY = 'samples'
COLOR_SPEC_KEY = 'color_spec'
MARKERY_KEY = 'marker'
TRIG_OFF_KEY = 'trig_off'
##################################################
# Channel Plotter for X Y Waveforms
##################################################
class channel_plotter(grid_plotter_base):
def __init__(self, parent):
"""
Create a new channel plotter.
"""
#init
grid_plotter_base.__init__(self, parent, MIN_PADDING)
#setup legend cache
self._legend_cache = self.new_gl_cache(self._draw_legend, 50)
self.enable_legend(False)
#setup waveform cache
self._waveform_cache = self.new_gl_cache(self._draw_waveforms, 50)
self._channels = dict()
#init channel plotter
self.register_init(self._init_channel_plotter)
def _init_channel_plotter(self):
"""
Run gl initialization tasks.
"""
GL.glEnableClientState(GL.GL_VERTEX_ARRAY)
def enable_legend(self, enable=None):
"""
Enable/disable the legend.
@param enable true to enable
@return the enable state when None
"""
if enable is None: return self._enable_legend
self.lock()
self._enable_legend = enable
self._legend_cache.changed(True)
self.unlock()
def _draw_waveforms(self):
"""
Draw the waveforms for each channel.
Scale the waveform data to the grid using gl matrix operations.
"""
#use scissor to prevent drawing outside grid
GL.glEnable(GL.GL_SCISSOR_TEST)
GL.glScissor(
self.padding_left+1,
self.padding_bottom+1,
self.width-self.padding_left-self.padding_right-1,
self.height-self.padding_top-self.padding_bottom-1,
)
for channel in reversed(sorted(self._channels.keys())):
samples = self._channels[channel][SAMPLES_KEY]
num_samps = len(samples)
if not num_samps: continue
#use opengl to scale the waveform
GL.glPushMatrix()
GL.glTranslatef(self.padding_left, self.padding_top, 0)
GL.glScalef(
(self.width-self.padding_left-self.padding_right),
(self.height-self.padding_top-self.padding_bottom),
1,
)
GL.glTranslatef(0, 1, 0)
if isinstance(samples, tuple):
x_scale, x_trans = 1.0/(self.x_max-self.x_min), -self.x_min
points = zip(*samples)
else:
x_scale, x_trans = 1.0/(num_samps-1), -self._channels[channel][TRIG_OFF_KEY]
points = zip(numpy.arange(0, num_samps), samples)
GL.glScalef(x_scale, -1.0/(self.y_max-self.y_min), 1)
GL.glTranslatef(x_trans, -self.y_min, 0)
#draw the points/lines
GL.glColor3f(*self._channels[channel][COLOR_SPEC_KEY])
marker = self._channels[channel][MARKERY_KEY]
if marker is None:
GL.glVertexPointerf(points)
GL.glDrawArrays(GL.GL_LINE_STRIP, 0, len(points))
elif isinstance(marker, (int, float)) and marker > 0:
GL.glPointSize(marker)
GL.glVertexPointerf(points)
GL.glDrawArrays(GL.GL_POINTS, 0, len(points))
GL.glPopMatrix()
GL.glDisable(GL.GL_SCISSOR_TEST)
def _populate_point_label(self, x_val, y_val):
"""
Get the text the will populate the point label.
Give X and Y values for the current point.
Give values for the channel at the X coordinate.
@param x_val the current x value
@param y_val the current y value
@return a string with newlines
"""
#create text
label_str = '%s: %s\n%s: %s'%(
self.x_label, common.eng_format(x_val, self.x_units),
self.y_label, common.eng_format(y_val, self.y_units),
)
for channel in sorted(self._channels.keys()):
samples = self._channels[channel][SAMPLES_KEY]
num_samps = len(samples)
if not num_samps: continue
if isinstance(samples, tuple): continue
#linear interpolation
x_index = (num_samps-1)*(x_val-self.x_min)/(self.x_max-self.x_min)
x_index_low = int(math.floor(x_index))
x_index_high = int(math.ceil(x_index))
scale = x_index - x_index_low + self._channels[channel][TRIG_OFF_KEY]
y_value = (samples[x_index_high] - samples[x_index_low])*scale + samples[x_index_low]
label_str += '\n%s: %s'%(channel, common.eng_format(y_value, self.y_units))
return label_str
def _draw_legend(self):
"""
Draw the legend in the upper right corner.
For each channel, draw a rectangle out of the channel color,
and overlay the channel text on top of the rectangle.
"""
if not self.enable_legend(): return
x_off = self.width - self.padding_right - LEGEND_BOX_PADDING
for i, channel in enumerate(reversed(sorted(self._channels.keys()))):
samples = self._channels[channel][SAMPLES_KEY]
if not len(samples): continue
color_spec = self._channels[channel][COLOR_SPEC_KEY]
txt = gltext.Text(channel, font_size=LEGEND_TEXT_FONT_SIZE)
w, h = txt.get_size()
#draw rect + text
GL.glColor3f(*color_spec)
self._draw_rect(
x_off - w - LEGEND_BOX_PADDING,
self.padding_top/2 - h/2 - LEGEND_BOX_PADDING,
w+2*LEGEND_BOX_PADDING,
h+2*LEGEND_BOX_PADDING,
)
txt.draw_text(wx.Point(x_off - w, self.padding_top/2 - h/2))
x_off -= w + 4*LEGEND_BOX_PADDING
def clear_waveform(self, channel):
"""
Remove a waveform from the list of waveforms.
@param channel the channel key
"""
self.lock()
if channel in self._channels.keys():
self._channels.pop(channel)
self._legend_cache.changed(True)
self._waveform_cache.changed(True)
self.unlock()
def set_waveform(self, channel, samples=[], color_spec=(0, 0, 0), marker=None, trig_off=0):
"""
Set the waveform for a given channel.
@param channel the channel key
@param samples the waveform samples
@param color_spec the 3-tuple for line color
@param marker None for line
@param trig_off fraction of sample for trigger offset
"""
self.lock()
if channel not in self._channels.keys(): self._legend_cache.changed(True)
self._channels[channel] = {
SAMPLES_KEY: samples,
COLOR_SPEC_KEY: color_spec,
MARKERY_KEY: marker,
TRIG_OFF_KEY: trig_off,
}
self._waveform_cache.changed(True)
self.unlock()
if __name__ == '__main__':
app = wx.PySimpleApp()
frame = wx.Frame(None, -1, 'Demo', wx.DefaultPosition)
vbox = wx.BoxSizer(wx.VERTICAL)
plotter = channel_plotter(frame)
plotter.set_x_grid(-1, 1, .2)
plotter.set_y_grid(-1, 1, .4)
vbox.Add(plotter, 1, wx.EXPAND)
plotter = channel_plotter(frame)
plotter.set_x_grid(-1, 1, .2)
plotter.set_y_grid(-1, 1, .4)
vbox.Add(plotter, 1, wx.EXPAND)
frame.SetSizerAndFit(vbox)
frame.SetSize(wx.Size(800, 600))
frame.Show()
app.MainLoop()
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