puredata/6.externs/obj4.c

   1 /* code for the "obj4" pd class.  This adds a creation argument, of
   2 type "float".  */
   3
   4 #include "m_pd.h"
   5
   6 typedef struct obj4
   7 {
   8   t_object x_ob;
   9   t_outlet *x_outlet;
  10   float x_value;
  11 } t_obj4;
  12
  13 void obj4_float(t_obj4 *x, t_floatarg f)
  14 {
  15     outlet_float(x->x_outlet, x->x_value + f);
  16 }
  17
  18 void obj4_ft1(t_obj4 *x, t_floatarg g)
  19 {
  20     x->x_value = g;
  21 }
  22
  23 t_class *obj4_class;
  24
  25     /* as requested by the new invocation of "class_new" below, the new
  26     routine will be called with a "float" argument. */
  27 void *obj4_new(t_floatarg f)
  28 {
  29     t_obj4 *x = (t_obj4 *)pd_new(obj4_class);
  30     inlet_new(&x->x_ob, &x->x_ob.ob_pd, gensym("float"), gensym("ft1"));
  31     x->x_outlet = outlet_new(&x->x_ob, gensym("float"));
  32         /* just stick the argument in the object structure for later. */
  33     x->x_value = f;
  34     return (void *)x;
  35 }
  36
  37 void obj4_setup(void)
  38 {
  39         /* here we add "A_DEFFLOAT" to the (zero-terminated) list of arg
  40         types we declare for a new object.  The value will be filled
  41         in as 0 if not given in the object box.  */
  42     obj4_class = class_new(gensym("obj4"), (t_newmethod)obj4_new,
  43         0, sizeof(t_obj4), 0, A_DEFFLOAT, 0);
  44     class_addmethod(obj4_class, (t_method)obj4_ft1, gensym("ft1"), A_FLOAT, 0);
  45     class_addfloat(obj4_class, obj4_float);
  46 }
  47