source/input/smoothcontrol.cpp

   1 #include <stdexcept>
   2 #include "smoothcontrol.h"
   3
   4 using namespace std;
   5
   6 namespace Msp {
   7 namespace Input {
   8
   9 SmoothControl::SmoothControl():
  10         value(0),
  11         paired_ctrl(0),
  12         dead_zone(0.1),
  13         threshold(0.9)
  14 { }
  15
  16 SmoothControl::SmoothControl(const ControlSource &s):
  17         Control(s),
  18         value(0),
  19         paired_ctrl(0),
  20         dead_zone(0.1),
  21         threshold(0.9)
  22 { }
  23
  24 SmoothControl::SmoothControl(Device &d, ControlSrcType t, unsigned i):
  25         Control(d, t, i),
  26         value(0),
  27         paired_ctrl(0),
  28         dead_zone(0.1),
  29         threshold(0.9)
  30 { }
  31
  32 SmoothControl::~SmoothControl()
  33 {
  34         pair(0);
  35 }
  36
  37 void SmoothControl::set_dead_zone(float d)
  38 {
  39         if(d<0 || (threshold>0 && d>=threshold))
  40                 throw invalid_argument("SmoothControl::set_dead_zone");
  41         dead_zone = d;
  42 }
  43
  44 void SmoothControl::set_threshold(float t)
  45 {
  46         if(t>=0 && t<=dead_zone)
  47                 throw invalid_argument("SmoothControl::set_threshold");
  48         threshold = t;
  49 }
  50
  51 void SmoothControl::set_range(float d, float t)
  52 {
  53         if(d<0 || (t>=0 && d>=t))
  54                 throw invalid_argument("SmoothControl::set_range");
  55         dead_zone = d;
  56         threshold = t;
  57 }
  58
  59 void SmoothControl::pair(SmoothControl *ctrl)
  60 {
  61         if(ctrl==paired_ctrl)
  62                 return;
  63
  64         if(paired_ctrl)
  65         {
  66                 SmoothControl *old_pair = paired_ctrl;
  67                 paired_ctrl = 0;
  68                 old_pair->pair(0);
  69         }
  70
  71         paired_ctrl = ctrl;
  72
  73         if(paired_ctrl)
  74                 paired_ctrl->pair(this);
  75 }
  76
  77 void SmoothControl::on_press()
  78 {
  79         on_motion(1, 1-value);
  80 }
  81
  82 void SmoothControl::on_release()
  83 {
  84         if(value>0)
  85                 on_motion(0, -value);
  86 }
  87
  88 void SmoothControl::on_motion(float v, float r)
  89 {
  90         if(v<-dead_zone)
  91                 value = v+dead_zone;
  92         else if(v>dead_zone)
  93                 value = v-dead_zone;
  94         else
  95                 value = 0;
  96
  97         if(threshold>=0)
  98         {
  99                 if(v<-threshold)
 100                         value = -1;
 101                 else if(v>threshold)
 102                         value = 1;
 103                 else
 104                         value /= threshold-dead_zone;
 105         }
 106
 107         signal_motion.emit(value);
 108
 109         if(paired_ctrl && (v>0 || (v==0 && paired_ctrl->value!=0)))
 110                 paired_ctrl->on_motion(-v, -r);
 111 }
 112
 113 } // namespace Input
 114 } // namespace Msp