simple graphical plotter

Author: dkm

contrib/plot_accel.py

@@ -0,0 +1,163 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+# Copyright (C) 2010 Marc Poulhiès
+#
+#   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 3 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, see <http://www.gnu.org/licenses/>.
+#
+# Author: Marc Poulhiès
+
+import time
+import sys
+
+import pygame
+import os
+import optparse
+from datetime import datetime
+import math
+
+
+import serial
+import array
+
+def startAccessPoint():
+    return array.array('B', [0xFF, 0x07, 0x03]).tostring()
+
+def accDataRequest():
+    return array.array('B', [0xFF, 0x08, 0x07, 0x00, 0x00, 0x00, 0x00]).tostring()
+
+
+class Graph:
+    fontheight = 20
+    # These four values sould go into the configuration file
+    winheight = 800     # Window height at startup
+    width = 700      # Window width at startup
+
+    bgcolor = (255,255,255)          # Background color for the window
+
+    color = [(255,0,0), (0,255,0), (0,0,255)]
+
+    txtcolor = (255,0,0)
+
+    t = 0
+
+    prev_display_debug = None
+
+    def __init__(self, size):
+        pygame.init()
+        
+        self.previous_points = [0]*size
+
+        self.font = pygame.font.Font(None, self.fontheight)
+
+        self.screen = pygame.display.set_mode( (self.width, self.winheight), pygame.RESIZABLE )
+
+        pygame.display.set_caption( "Plotter" )
+        self.screen.fill( self.bgcolor )
+
+        pygame.display.flip()
+
+    def display_debug(self, dtext):
+        text = self.font.render(dtext, 1, self.txtcolor)
+        pos = text.get_rect(left=0, top=self.winheight -self.fontheight - 5)
+
+        if self.prev_display_debug:
+            self.screen.fill(self.bgcolor, self.prev_display_debug)
+
+        self.screen.blit(text, pos)
+
+        if self.prev_display_debug:
+            pygame.display.update(self.prev_display_debug)
+        else:
+            pygame.display.update(pos)
+
+        self.prev_display_debug = pos
+
+    def plot_values(self, values):
+        self.t += 1
+        yoff = 0
+        
+        each_y = self.winheight/len(values)
+
+        norms = [a * (each_y-5)/each_y for a in values]
+
+
+        for i in xrange(len(values)):
+            pygame.draw.aaline(self.screen, 
+                               self.color[i%3],
+                               (self.t-1, 
+                                self.previous_points[i]+yoff), 
+                               (self.t,
+                                norms[i]+yoff), 
+                               1)
+            yoff += each_y
+
+        rect = pygame.Rect(self.t-1, 0, 40, self.winheight)
+        pygame.display.update(rect)
+
+        if self.t >= 700:
+            self.t = 0
+            self.screen.fill( self.bgcolor )
+
+        self.previous_points = norms
+
+def conv(c):
+    if c > 127:
+        return c - 256
+    else:
+        return c
+
+def main():
+    parser = optparse.OptionParser(
+        usage='Usage: %prog [options]',
+        description="Plotter !")
+    
+    parser.add_option("-f", "--freq",
+                      help="Sampling frequency in ms (defaults: 10ms)",
+                      default=10, type="int",
+                      metavar="sampling_freq")
+
+    parser.add_option("-v", "--verbose",
+                      help="Be verbose and display lots of garbage",
+                      action="store_true", default=False,
+                      metavar="verbose")
+    
+    (options, args) = parser.parse_args(sys.argv[1:])
+    sampling_freq = options.freq
+
+
+    ser = serial.Serial('/dev/ttyACM0',115200,timeout=1)
+    ser.write(startAccessPoint())
+
+    g = None
+    while True:
+        ser.write(accDataRequest())
+        accel = ser.read(7)
+        if len(accel) < 3:
+            continue
+
+        if ord(accel[0]) != 0 and ord(accel[1]) != 0 and ord(accel[2]) != 0:
+            l = [conv(ord(accel[0]))+128, conv(ord(accel[1]))+128,conv(ord(accel[2]))+128]
+            print l
+            print "***"
+        else:
+            continue
+        if g == None:
+            g = Graph(len(l))
+        g.plot_values(l)
+        pygame.time.wait(sampling_freq)
+
+
+
+if __name__ == '__main__':
+    sys.exit(main())