src/metronome.cpp

   1 #include <stdio.h>
   2 #include <math.h>
   3
   4 #include <fltk/Widget.h>
   5 #include <fltk/events.h>
   6 #include <fltk/draw.h>
   7
   8 #include "seq.h"
   9 #include "backend.h"
  10 #include "metronome.h"
  11
  12
  13
  14 using namespace fltk;
  15
  16 Metronome::Metronome(int x, int y, int w, int h, const char* label = 0) : fltk::Widget(x, y, w, h, label) {
  17   N = 4;
  18   n = 2;
  19
  20   last_beat = 0;
  21   plus = 0;
  22
  23   r=255; g=0; b=0;
  24
  25   update(0);
  26 }
  27
  28 int Metronome::handle(int event){
  29   return 0;
  30 }
  31
  32 void Metronome::draw(){
  33   draw_box();
  34
  35   //setcolor(fltk::color(r,g,b));
  36   //fillrect(2,2,w()-4,h()-4);
  37
  38   setcolor(fltk::WHITE);
  39   int X = last_beat%N*(w()-4)/N+2;
  40   int W = (w()-4)/N;
  41   int H = h()-4;
  42   fillrect(X,2,W,h()-4);
  43
  44   //int W2 = W/2;
  45   //int H2 = H/2;
  46   //setcolor(fltk::color(r,g,b));
  47   //fillrect(X+W/2-W2/2,h()/2-H2/2,W2,H2);
  48
  49   //setcolor(fltk::BLACK);
  50   //int C = (getascent()-getdescent())/2;
  51   //drawtext(label(),X+W/2-getwidth(label())/2,h()/2+C);
  52
  53 }
  54
  55 //div N is the greatest divisor of N less than or equal to sqrt(N)
  56 int div(int N){
  57   int d = 0;
  58   for(int i=1; i<=sqrt(N); i++){
  59     if(N%i==0){
  60       d=i;
  61     }
  62   }
  63   if(d==1){
  64     //prime
  65   }
  66   return d;
  67 }
  68
  69 void Metronome::update(int tick){
  70   int now_beat = tick/TICKS_PER_BEAT;
  71
  72   if(now_beat != last_beat){
  73     int step = last_beat - now_beat;
  74     last_beat = now_beat;
  75
  76     char buf[16];
  77     snprintf(buf,16,"%d",now_beat%N + plus);
  78     copy_label(buf);
  79
  80     if(now_beat%N == 0){
  81       r=255; g=0; b=0;
  82     }
  83     else if(now_beat%n == 0){
  84       r=128; g=0; b=0;
  85     }
  86     else{
  87       r=0; g=0; b=0;
  88     }
  89
  90     redraw();
  91   }
  92 }
  93
  94 void Metronome::set_N(int zN){
  95   N = zN;
  96   n = div(zN);
  97 }
  98