singleword/cairo.c

   1 #include "singleword.h"
   2
   3 void drawPitchTier(cairo_t *cr, gchar *filename, gint width, gint height, gdouble top) {
   4         gchar *contents;
   5         gsize length;
   6         if (g_file_get_contents(filename, &contents, &length, NULL) != TRUE) {
   7         } else {
   8                 gdouble scalex = 0, scaley = 0;
   9                 gdouble fromx = 0;
  10                 gdouble middlex = 0;
  11                 gdouble endx = 0;
  12                 gdouble fromy = 0;
  13                 gdouble middley = 0;
  14                 gsize i = 0;
  15                 gsize j = 0;
  16                 gsize m = 0;
  17                 int pointloc = 0;
  18                 while (i < length) {
  19                         if (contents[i] == '\n') {
  20                                 gchar * this = g_strndup(&contents[m], i-m);
  21                                 switch ( j ) {
  22                                         case 0:
  23                                         case 1:
  24                                         case 2:
  25                                         case 3:
  26                                                 fromx = g_strtod(this, NULL);
  27                                                 j++;
  28                                                 break;
  29                                         case 4:
  30                                                 endx  = g_strtod(this, NULL);
  31                                                 scalex = width / endx;
  32                                                 scaley = height / top;
  33                                                 cairo_move_to(cr, fromx*scalex, 0);
  34                                         case 5:
  35                                                 j++;
  36                                                 break;
  37                                         default:
  38                                                 if (pointloc == 0) {
  39                                                         middlex = g_strtod(this, NULL);
  40
  41                                                         pointloc = 1;
  42                                                 } else {
  43                                                         gdouble to;
  44                                                         middley = g_strtod(this, NULL);
  45                                                         pointloc = 0;
  46                                                         to = height - (middley*scaley);
  47
  48                                                         if ((middlex - fromx) < 0.015 && fromy != -1 && middley != -1) {
  49                                                                 cairo_line_to(cr, middlex*scalex,  to);
  50                                                         } else {
  51                                                                 cairo_move_to(cr, middlex*scalex,  to);
  52                                                         }
  53                                                         fromx = middlex;
  54                                                         fromy = middley;
  55                                                 }
  56
  57                                 }
  58                                 g_free(this);
  59                                 m = i+1;
  60                         }
  61                         i++;
  62                 }
  63                 cairo_stroke (cr);
  64         }
  65 }