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