Changes to be committed:

new file:   examples/src/contour_test.c

examples/src/contour_test.c

@@ -0,0 +1,153 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "dspl.h"
+
+#define N  3
+#define M  4
+
+
+typedef double    point2d_t[2];
+typedef point2d_t linseg_t[2];
+ 
+ 
+int add_linseg(linseg_t** ls, int* lsnum, int* lscnt, point2d_t* p0, point2d_t* p1)
+{
+	int n, c;
+	n = *lsnum;
+	c = *lscnt;
+	if((n == 0) && ((*ls)==NULL))
+	{
+		n = 128;
+		(*ls) = (linseg_t*)malloc(n * sizeof(linseg_t));
+	}
+	else
+	{
+		if(c >= n)
+		{
+			n += 128;
+			(*ls) = (linseg_t*)realloc((*ls), n * sizeof(linseg_t));
+		}
+	}
+	(*ls)[c][0][0] = p0[0][0];
+	(*ls)[c][0][1] = p0[0][1];
+	(*ls)[c][1][0] = p1[0][0];
+	(*ls)[c][1][1] = p1[0][1];
+	c++;
+	(*lsnum) = n;
+	(*lscnt) = c;
+	
+	return RES_OK;
+}
+
+int linseg_create(int* z, int n, int m, linseg_t** ls, int* sz)
+{
+    int lsnum, lscnt, t, in, im, i;
+	point2d_t p0 = {0};
+	point2d_t p1 = {0};
+	
+	if((ls== NULL)||(z==NULL))
+		return ERROR_PTR;
+	lsnum = 0;
+	lscnt = 0;
+	
+	for(in = 0; in < n-1; in++)
+	{
+		for(im = 0; im < m-1; im++)
+		{
+			i = in + im * n;
+			t = z[i]*8 + z[i+n]*4 + z[i+n+1]*2 + z[i+1];
+			printf("%d, %d, %d\n", in, im, t);
+			switch(t)
+			{
+				case 0:
+					break;
+				case 1:
+					p0[0] = (double) in + 0.5;
+					p0[1] = (double) im;
+					p1[0] = (double) in + 1.0;
+					p1[1] = (double) im + 0.5;
+					add_linseg(ls, &lsnum, &lscnt, &p0, &p1);
+					break;
+				case 2:
+					p0[0] = (double) in + 0.5;
+					p0[1] = (double) im + 1.0;
+					p1[0] = (double) in + 1.0;
+					p1[1] = (double) im + 0.5;
+					add_linseg(ls, &lsnum, &lscnt, &p0, &p1);
+					break;
+				case 3:
+					p0[0] = (double) in + 0.5;
+					p0[1] = (double) im;
+					p1[0] = (double) in + 0.5;
+					p1[1] = (double) im + 1.0;
+					add_linseg(ls, &lsnum, &lscnt, &p0, &p1);
+					break;
+				case 4:
+					p0[0] = (double) in;
+					p0[1] = (double) im + 0.5;
+					p1[0] = (double) in + 0.5;
+					p1[1] = (double) im + 1.0;
+					add_linseg(ls, &lsnum, &lscnt, &p0, &p1);
+					break;
+				case 5:
+					break;
+				case 6:
+					break;
+				case 7:
+					break;
+				case 8:
+					p0[0] = (double) in;
+					p0[1] = (double) im + 0.5;
+					p1[0] = (double) in + 0.5;
+					p1[1] = (double) im;
+					add_linseg(ls, &lsnum, &lscnt, &p0, &p1);
+					break;
+				case 9:
+					break;
+				case 10:
+					break;
+				case 12:
+					p0[0] = (double) in + 0.5;
+					p0[1] = (double) im;
+					p1[0] = (double) in + 0.5;
+					p1[1] = (double) im + 1.0;
+					add_linseg(ls, &lsnum, &lscnt, &p0, &p1);
+					break;
+				case 13:
+					break;
+				case 14:
+					break;
+				case 15:
+					break;
+				default:
+					break;
+			}
+			
+			
+		}
+	}
+	*ls = (linseg_t*)realloc(*ls, lscnt * sizeof(linseg_t));
+	*sz = lscnt;
+	
+	
+	return RES_OK;
+}
+
+int main(int argc, char* argv[])
+{
+    /* Matrix 
+    z = [ 0   0   0   0;
+          0   1   1   0;
+          0   0   0   0];
+    in array a by columns
+    */
+    int z[N*M] = { 0, 0, 0,   0, 1, 0,   0, 1, 0,   0, 0, 0};
+    linseg_t *ls = NULL;
+	int nls, i;
+	
+	linseg_create(z, N, M, &ls, &nls);
+	for(i =0; i< nls; i++)
+		printf("%d, [%.1f %.1f] -- [%.1f %.1f]\n", i, ls[i][0][0], ls[i][0][1], ls[i][1][0], ls[i][1][1]);
+    return 0;
+}