new tab manipulation object : integration and derivative

svn path=/trunk/externals/nusmuk/; revision=17566

1 files changed, 84 insertions, 0 deletions

diff --git a/nusmuk-utils/tab_integrate.c b/nusmuk-utils/tab_integrate.c
new file mode 100644
index 0000000..7d83489
--- /dev/null
+++ b/nusmuk-utils/tab_integrate.c
@@ -0,0 +1,84 @@
+#include "m_pd.h"  
+
+#define MIN(a,b) (((a)<(b))?(a):(b))
+
+static t_class *tab_integrate_class;  
+ 
+typedef struct _tab_integrate {  
+    t_object  x_obj;  
+    t_symbol *x_arrayname_src1;
+    t_symbol *x_arrayname_dst;
+    t_outlet *b_out;
+} t_tab_integrate;  
+ 
+void *tab_integrate_new(t_symbol *s_src1, t_symbol *s_dst)  {  
+    t_tab_integrate *x = (t_tab_integrate *)pd_new(tab_integrate_class);  
+ 
+    x->x_arrayname_src1 = s_src1;
+    x->x_arrayname_dst = s_dst;
+    
+    x->b_out = outlet_new(&x->x_obj, &s_bang);  
+
+    return (void *)x;  
+}  
+
+void tab_integrate_compute(t_tab_integrate *x, t_float nb)  {  
+    t_garray *a_src1, *a_dst;
+    int npoints_src1, npoints_dst;
+    t_word *vec_src1, *vec_dst;
+    t_float integral;
+    
+    int nb_integrate, i;
+    
+    integral = 0;
+    
+    if (!(a_src1 = (t_garray *)pd_findbyclass(x->x_arrayname_src1, garray_class)))
+        pd_error(x, "%s: no such array", x->x_arrayname_src1->s_name);
+    else if (!garray_getfloatwords(a_src1, &npoints_src1, &vec_src1))
+        pd_error(x, "%s: bad template for tab_integrate", x->x_arrayname_src1->s_name);
+    else if (!(a_dst = (t_garray *)pd_findbyclass(x->x_arrayname_dst, garray_class)))
+        pd_error(x, "%s: no such array", x->x_arrayname_dst->s_name);
+    else if (!garray_getfloatwords(a_dst, &npoints_dst, &vec_dst))
+        pd_error(x, "%s: bad template for tab_integrate", x->x_arrayname_dst->s_name);
+    else
+    {
+        nb_integrate = MIN(npoints_src1, npoints_dst);
+        // post("nb_integrate = %d",nb_integrate);
+
+        if (nb > 0)
+            nb_integrate = MIN(nb_integrate, nb);
+
+        for (i=0; i<nb_integrate;i++) {
+            integral += vec_src1[i].w_float;
+            vec_dst[i].w_float = integral;
+        }
+        garray_redraw(a_dst);
+    }
+    outlet_bang(x->b_out);  
+}  
+ 
+void tab_integrate_bang(t_tab_integrate *x)  {
+    tab_integrate_compute(x, -1) ;
+}
+
+void tab_integrate_float(t_tab_integrate *x, t_float nb)  {
+    tab_integrate_compute(x, nb) ;
+}
+
+void tab_integrate_src1(t_tab_integrate *x, t_symbol *s_src) {
+    x->x_arrayname_src1 = s_src;
+}
+
+void tab_integrate_dst(t_tab_integrate *x, t_symbol *s_dst) {
+    x->x_arrayname_dst = s_dst;
+}
+
+void tab_integrate_setup(void) {  
+  tab_integrate_class = class_new(gensym("tab_integrate"), (t_newmethod)tab_integrate_new,  
+        0, sizeof(t_tab_integrate), CLASS_DEFAULT, A_DEFSYM, A_DEFSYM, A_DEFSYM, 0);  
+  class_addbang(tab_integrate_class, tab_integrate_bang);  
+  class_addfloat(tab_integrate_class, tab_integrate_float);  
+  class_addmethod(tab_integrate_class, (t_method)tab_integrate_src1, gensym("src1"),  A_DEFSYM, 0);  
+  class_addmethod(tab_integrate_class, (t_method)tab_integrate_dst, gensym("dst"),  A_DEFSYM, 0);  
+} 
+