From 5086631c287a954bae9c2bb4a987cb7f1eda3e57 Mon Sep 17 00:00:00 2001
From: Franz Zotter <fzotter@users.sourceforge.net>
Date: Tue, 21 Aug 2012 08:10:42 +0000
Subject: convex hull algorithm added

svn path=/trunk/externals/iem/iemmatrix/; revision=16165
---
 src/mtx_qhull.c | 167 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 167 insertions(+)
 create mode 100644 src/mtx_qhull.c

(limited to 'src/mtx_qhull.c')

diff --git a/src/mtx_qhull.c b/src/mtx_qhull.c
new file mode 100644
index 0000000..700821f
--- /dev/null
+++ b/src/mtx_qhull.c
@@ -0,0 +1,167 @@
+/*
+ *  iemmatrix
+ *
+ *  objects for manipulating simple matrices
+ *  own qhull algorithm implementation
+ *
+ * Copyright (c) 2012, Franz Zotter
+ * IEM, Graz, Austria
+ *
+ * For information on usage and redistribution, and for a DISCLAIMER OF ALL
+ * WARRANTIES, see the file, "LICENSE.txt," in this distribution.
+ *
+ */
+
+
+#include "iemmatrix.h"
+#include <stdlib.h>
+#include "mtx_qhull/list.h"
+#include "mtx_qhull/vectors.h"
+#include "mtx_qhull/zhull.h"
+#include "mtx_qhull/list.c"
+#include "mtx_qhull/vectors.c"
+#include "mtx_qhull/zhull.c"
+
+static t_class *mtx_qhull_class;
+
+typedef struct MTXQhull_ MTXQhull;
+struct MTXQhull_  {
+    t_object x_obj;
+    t_outlet *outl;
+    t_atom *list;
+    size_t size;
+    size_t hull_size;
+    int iter;
+    zhull_t *zh;
+};
+
+static void deleteMTXQhull(MTXQhull *xo) {
+    if (xo->zh!=0) {
+        free(xo->zh);
+        xo->zh=0;
+    }
+    if (xo->list!=0) {
+        free(xo->list);
+        xo->list=0;
+        xo->size=0;
+    }
+}
+
+void mTXQhullSetIterations(MTXQhull *xo, t_float f) {
+    xo->iter=(int)f;
+    if (xo->iter<0)
+        xo->iter=0;
+}
+
+static void *newMTXQhull(t_symbol *s, int argc, t_atom *argv) {
+    int nmax;
+    MTXQhull *xo = (MTXQhull *) pd_new (mtx_qhull_class);
+    xo->outl = outlet_new (&xo->x_obj, gensym("matrix"));
+    xo->zh=0;
+    xo->list=0;
+    xo->size=0;
+    xo->iter=0;
+    if (argc>0)
+        mTXQhullSetIterations(xo,atom_getfloat(argv));
+    return ((void *) xo);
+}
+
+
+static void mTXQhullMatrix(MTXQhull *xo, t_symbol *s,
+        int argc, t_atom *argv) {
+    int i;
+    int rows=atom_getint(argv++);
+    int columns=atom_getint(argv++);
+    int size=rows*columns;
+    int in_size=argc-2;
+    float *x;
+    float *y;
+    float *z;
+
+    /* size check */
+    if (!size) 
+        post("mtx_qhull: invalid dimensions");
+    else if (in_size<size) 
+        post("mtx_qhull: sparse matrix not yet supported: use \"mtx_check\"");
+    else if ((rows<4)||(columns!=3))
+        post("mtx_qhull: requires an L x 3 matrix with at least L>=4");
+    else {
+        xo->zh = (zhull_t*)malloc(sizeof(zhull_t));
+        x=(float*)malloc(rows*sizeof(float));
+        y=(float*)malloc(rows*sizeof(float));
+        z=(float*)malloc(rows*sizeof(float));
+        if ((x!=0)&&(y!=0)&&(z!=0)&&(xo->zh!=0)) {
+            for (i=0; i<rows; i++) {
+                x[i]=atom_getfloat(argv++);
+                y[i]=atom_getfloat(argv++);
+                z[i]=atom_getfloat(argv++);
+            }
+            *(xo->zh)=zhullInitPoints(x,y,z,rows);	
+            calculateZHull(xo->zh,xo->iter);
+            free(x);
+            free(y);
+            free(z);
+            xo->hull_size=getLength(xo->zh->facets);
+            if (xo->list==0) {
+                xo->list = (t_atom*)malloc((xo->hull_size*3+2)*sizeof(t_atom));
+            } else {
+                xo->list = (t_atom*)realloc(xo->list,(xo->hull_size*3+2)*sizeof(t_atom));
+            }
+            if(xo->list!=0) {
+                xo->size=(xo->hull_size*3+2);
+                SETFLOAT(xo->list,(float)xo->hull_size);
+                SETFLOAT(xo->list+1,(float)3);
+                for (i=0; i<xo->hull_size; i++) {
+                    SETFLOAT(xo->list+2+3*i, (float)getEntry(
+                                getFacetByIndex(xo->zh->facets,i)->corners,0)+1);
+                    SETFLOAT(xo->list+3+3*i, (float)getEntry(
+                                getFacetByIndex(xo->zh->facets,i)->corners,1)+1);
+                    SETFLOAT(xo->list+4+3*i, (float)getEntry(
+                                getFacetByIndex(xo->zh->facets,i)->corners,2)+1);
+                }
+                outlet_anything(xo->outl, gensym("matrix"), 
+                        xo->size, xo->list);
+                freeZhull(xo->zh);
+                free(xo->zh);
+                xo->zh=0;
+            }
+            else {
+                post("mtx_qhull: memory problem, no operation!");
+                xo->size=0;
+                freeZhull(xo->zh);
+                free(xo->zh);
+                xo->zh=0;
+            } 
+        }
+        else {
+            if(x!=0)
+                free(x);
+            if(y!=0)
+                free(y);
+            if(z!=0)
+                free(z);
+            if(xo->zh!=0)
+                free(xo->zh);            
+            xo->zh=0;
+            post("mtx_qhull: memory error, no operation!");
+        }
+
+    }
+}
+
+void mtx_qhull_setup (void) {
+    mtx_qhull_class = class_new (
+            gensym("mtx_qhull"),
+            (t_newmethod) newMTXQhull,
+            (t_method) deleteMTXQhull,
+            sizeof(MTXQhull),
+            CLASS_DEFAULT, A_GIMME, 0);
+    class_addmethod(mtx_qhull_class, (t_method) mTXQhullMatrix, gensym("matrix"), A_GIMME, 0);
+    class_addfloat(mtx_qhull_class, (t_method) mTXQhullSetIterations);
+}
+
+void iemtx_qhull_setup(void){
+    mtx_qhull_setup();
+}
+
+
-- 
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