gr-air-modes/python/az_map.py

#!/usr/bin/env python
#
# Copyright 2012 Nick Foster
# 
# This file is part of gr-air-modes
# 
# gr-air-modes 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.
# 
# gr-air-modes 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 gr-air-modes; see the file COPYING.  If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
#

# azimuthal projection widget to plot reception range vs. azimuth

from PyQt4 import QtCore, QtGui
import threading
import math


# model has max range vs. azimuth in n-degree increments
# contains separate max range for a variety of altitudes so
# you can determine your altitude dropouts by bearing
# assumes that if you can hear ac at 1000', you can hear at 5000'+.
class az_map_model(QtCore.QObject):
    dataChanged = QtCore.pyqtSignal(name='dataChanged')
    npoints = 360/5
    def __init__(self, parent=None):
        super(az_map_model, self).__init__(parent)
        self._data = []
        self.lock = threading.Lock()
        self._altitudes = [0, 1000, 2000, 5000, 10000, 15000, 20000, 25000, 30000]
        #initialize everything to 0
        for i in range(0,az_map_model.npoints):
            self._data.append([0] * len(self._altitudes))

    def rowCount(self):
        return len(self._data)

    def columnCount(self):
        return len(self._altitudes)

    def data(self, row, col):
        return self._data[row][col]
    
    def addRecord(self, bearing, altitude, distance):
        with self.lock:
            #round up to nearest altitude in altitudes list
            #there's probably another way to do it
            col = self._altitudes.index(min([alt for alt in self._altitudes if alt >= altitude]))
            #find which bearing row we sit in
            row = int(bearing+(180/az_map_model.npoints)) / (360/az_map_model.npoints)
            #set max range for all alts >= the ac alt
            #this expresses the assumption that higher ac can be heard further
            for i in range(col, len(self._altitudes)):
                if distance > self._data[row][i]:
                    self._data[row][i] = distance
                    self.dataChanged.emit()

    def reset(self):
        with self.lock:
            self._data = []
            for i in range(0,az_map_model.npoints):
                self._data.append([0] * len(self._altitudes))
                self.dataChanged.emit()


# the azimuth map widget
class az_map(QtGui.QWidget):
    maxrange = 450
    ringsize = 100
    bgcolor = QtCore.Qt.black
    ringpen =  QtGui.QPen(QtGui.QColor(0,   96,  127, 255), 1.3)
    rangepen = QtGui.QPen(QtGui.QColor(255, 255, 0,   255), 1.0)
    
    def __init__(self, parent=None):
        super(az_map, self).__init__(parent)
        self._model = None
        self._path = QtGui.QPainterPath()

    def minimumSizeHint(self):
        return QtCore.QSize(50, 50)

    def sizeHint(self):
        return QtCore.QSize(300, 300)

    def setModel(self, model):
        self._model = model
        self._model.dataChanged.connect(self.drawPath)

    def paintEvent(self, event):
        painter = QtGui.QPainter(self)
        painter.setRenderHint(QtGui.QPainter.Antialiasing)

        #set background
        painter.fillRect(event.rect(), QtGui.QBrush(az_map.bgcolor))
        
        #draw the range rings
        self.drawRangeRings(painter)
        #self.drawPath()

        painter.setPen(az_map.rangepen)
        painter.drawPath(self._path)

    def drawPath(self):
        self._path = QtGui.QPainterPath()
        if(self._model):
            for i in range(az_map_model.npoints-1,-1,-1):
                #bearing is to start point of arc (clockwise) 
                bearing = (i+0.5) * 360./az_map_model.npoints
                distance = self._model._data[i][self._model.columnCount()-1]
                #convert bearing,distance to x,y
                radius = min(self.width(), self.height()) / 2.0
                xpts = (radius * distance / az_map.maxrange) * math.sin(bearing * math.pi / 180)
                ypts = (radius * distance / az_map.maxrange) * math.cos(bearing * math.pi / 180)
                #get the bounding rectangle of the arc
                arcscale = radius * distance / az_map.maxrange
                arcrect = QtCore.QRectF(QtCore.QPointF(0-arcscale, 0-arcscale),
                                        QtCore.QPointF(arcscale, arcscale))
                
                self._path.lineTo(xpts,0-ypts)
                self._path.arcTo(arcrect, 90-bearing, 360./az_map_model.npoints)
        self.repaint()

    def drawRangeRings(self, painter):
        painter.translate(self.width()/2, self.height()/2)
        painter.setPen(az_map.ringpen)
        for i in range(0, az_map.maxrange, az_map.ringsize):
            diameter = (float(i) / az_map.maxrange) * min(self.width(), self.height())
            painter.drawEllipse(QtCore.QRectF(-diameter / 2.0,
                                -diameter / 2.0, diameter, diameter))

import random, time

class model_updater(threading.Thread):
    def __init__(self, model):
        super(model_updater, self).__init__()
        self.model = model
        self.setDaemon(1)
        self.done = False
        self.start()

    def run(self):
        for i in range(az_map_model.npoints):
            self.model.addRecord(i*360./az_map_model.npoints, 30000, random.randint(0,400))
            time.sleep(0.1)
        
class Window(QtGui.QWidget):
    def __init__(self):
        super(Window, self).__init__()
        layout = QtGui.QGridLayout()
        self.model = az_map_model()
        mymap = az_map(None)
        mymap.setModel(self.model)
        self.updater = model_updater(self.model)
        layout.addWidget(mymap, 0, 1)
        self.setLayout(layout)

if __name__ == '__main__':

    import sys

    app = QtGui.QApplication(sys.argv)
    window = Window()
    window.show()
    window.update()
    sys.exit(app.exec_())