Motion.cpp

00001 //
00002 // This file contains function related to the motion 
00003 // control of the home monitoring system
00004 //
00005 
00006 #include <vector>
00007 #include <string>
00008 #include <sstream>
00009 
00010 // TODO - add timestamp to motion samples
00011 #include "Motion.h"
00012   
00013 Motion::Motion() {
00014     // These are motion deltas based on playing with
00015     // mbed application board motion sensors.
00016     //
00017     // Originally 0.097 was sufficient, but I get false 
00018     // motion of 0.14 sometimes.  This makes it somewhat less
00019     // responsive to small motion, but better than too many
00020     // false alarms.  I should look into motion sensors to
00021     // see what is up or if something has been fixed??
00022     min_motion.x = 0.15;  
00023     min_motion.y = 0.15;  
00024     min_motion.z = 0.15; 
00025     max_samples_limit = 100; // Max motion buffer is 100 deep
00026     max_samples = 20;
00027     sample_ptr = 0;
00028     wrapped_once = false;
00029     // WARNING - width here is important - must be 7 characters!
00030     motion_samples.resize(max_samples,"0.00000");
00031 }
00032 
00033 bool Motion::change_max_samples(int num_samples) {
00034     // WARNING - setting this dumps all saved data!
00035     if (num_samples > 0 && num_samples <= max_samples_limit) {
00036         max_samples = num_samples;
00037         // WARNING - width here is important - must be 7 characters!
00038         motion_samples.resize(max_samples, "0.00000");
00039         return true;
00040     }
00041     else {
00042         return false;
00043     }
00044 }
00045 
00046 void Motion::add_sample(double sample) {
00047     std::string str_sample;
00048     convert_sample(sample, str_sample);
00049     if (sample_ptr == max_samples) {
00050         wrapped_once = true;
00051         sample_ptr = 0;
00052         motion_samples[sample_ptr] = str_sample;
00053     }
00054     else {
00055         motion_samples[sample_ptr++] = str_sample;
00056     }
00057 }
00058 
00059 bool Motion::set_motion_thresh(motion_vec motion_thresh) {
00060     // FIXME - maybe add limit checking here.  At least 
00061     // limit to 7 character values?
00062     min_motion.x = motion_thresh.x;
00063     min_motion.y = motion_thresh.y;
00064     min_motion.z = motion_thresh.z;
00065     return true;
00066 }
00067 
00068 motion_vec Motion::get_motion_thresh(void) {
00069     return min_motion;
00070 }
00071 
00072 int Motion::get_max_samples() {
00073     return max_samples;
00074 }
00075 
00076 const std::vector<std::string> &Motion::get_samples(void) {
00077     // FIXME - need to copy out samples in order of oldest
00078     // to newest or maybe not if change to contain timestamp
00079     // and let the host worry about adding it.  If use multi-map
00080     // it would be sorted automatically.  Maybe a better idea.
00081     return motion_samples;
00082 }
00083