trigonometric operations added

trigonometric/bounding-box.c

@@ -25,9 +25,11 @@
 
 #include <stdio.h>
 #include "bounding-box.h"
+#include <math.h>
 
 #define MIN(a,b) (((a) < (b)) ? (a) : (b)) /**< @brief Return smaller number */
 #define MAX(a,b) (((a) > (b)) ? (a) : (b)) /**< @brief Return bigger number */
+#define ABS_DBL(a) ((a) < 0 ? -(a) : (a))
 
 void bounding_box_calculate_polygon(GList *vertices, conv_generic_to_vector_2d_t conv_func, union bounding_box *box)
 {
@@ -41,7 +43,10 @@ void bounding_box_calculate_polygon(GList *vertices, conv_generic_to_vector_2d_t
 
 	for (list_item = vertices; list_item != NULL; list_item = g_list_next(list_item)) {
 		/* Convert generic vertex to vector_2d */
+		if (conv_func)
 			conv_func((void *)list_item->data, &temp_vec);
+		else
+			vector_2d_copy(&temp_vec, (struct vector_2d *)list_item->data);
 
 		/* Update bounding coordinates with vertex */
 		xmin = MIN(xmin, temp_vec.x);
@@ -79,3 +84,56 @@ void bounding_box_prepare_empty(union bounding_box *box)
 	box->vectors.upper_right.x = DBL_MIN;
 	box->vectors.upper_right.y = DBL_MIN;
 }
+
+static void calculate_path_miter_points(struct vector_2d *a, struct vector_2d *b, struct vector_2d *c,
+					struct vector_2d *m1, struct vector_2d *m2, double width)
+{
+	double angle, angle_sin, u;
+	struct vector_2d ba, bc, u_vec, v_vec, ba_norm;
+
+	if (!a || !b || !c || !m1 || !m2)
+		return;
+
+	vector_2d_subtract(&ba, a, b);
+	vector_2d_subtract(&bc, c, b);
+
+	angle = vector_2d_calculate_angle_between(&ba, &bc);
+
+	if (ABS_DBL(angle) < 0.05 || ABS_DBL(angle - M_PI) < 0.1) {
+		/* Specail cases Don*/
+		vector_2d_copy(&ba_norm, &ba);
+		vector_2d_rotate(&ba_norm, DEG2RAD(90));
+		vector_2d_normalize(&ba_norm);
+		vector_2d_scale(&ba_norm, width/2.0);
+		vector_2d_add(m1, b, &ba_norm);
+		vector_2d_subtract(m2, b, &ba_norm);
+		return;
+	}
+	angle_sin = sin(angle);
+	u = width/(2*angle_sin);
+
+	vector_2d_copy(&u_vec, &ba);
+	vector_2d_copy(&v_vec, &bc);
+	vector_2d_normalize(&u_vec);
+	vector_2d_normalize(&v_vec);
+	vector_2d_scale(&u_vec, u);
+	vector_2d_scale(&v_vec, u);
+
+	vector_2d_copy(m1, b);
+	vector_2d_add(m1, m1, &u_vec);
+	vector_2d_add(m1, m1, &v_vec);
+
+	vector_2d_copy(m2, b);
+	vector_2d_subtract(m2, m2, &u_vec);
+	vector_2d_subtract(m2, m2, &v_vec);
+}
+
+void bounding_box_calculate_path_box(GList *vertices, conv_generic_to_vector_2d_t conv_func, union bounding_box *box)
+{
+
+}
+
+void bounding_box_update_point(union bounding_box *destination, conv_generic_to_vector_2d_t conv_func, void *pt)
+{
+
+}

trigonometric/bounding-box.h

@@ -41,5 +41,5 @@ typedef void (*conv_generic_to_vector_2d_t)(void *, struct vector_2d *);
 void bounding_box_calculate_polygon(GList *vertices, conv_generic_to_vector_2d_t conv_func, union bounding_box *box);
 void bounding_box_update_box(union bounding_box *destination, union bounding_box *update);
 void bounding_box_prepare_empty(union bounding_box *box);
-
+void bounding_box_update_point(union bounding_box *destination, conv_generic_to_vector_2d_t conv_func, void *pt);
 #endif /* _BOUNDING_BOX_H_ */

trigonometric/vector-operations.c

@@ -27,6 +27,8 @@
 #include <math.h>
 #include <stdlib.h>
 
+#define ABS_DBL(a) ((a) < 0 ? -(a) : (a))
+
 double vector_2d_scalar_multipy(struct vector_2d *a, struct vector_2d *b)
 {
 	if (a && b)
@@ -35,7 +37,7 @@ double vector_2d_scalar_multipy(struct vector_2d *a, struct vector_2d *b)
 		return 0.0;
 }
 
-void vector_2d_normaize(struct vector_2d *vec)
+void vector_2d_normalize(struct vector_2d *vec)
 {
 	double len;
 	if (!vec)
@@ -53,14 +55,14 @@ void vector_2d_rotate(struct vector_2d *vec, double angle)
 	sin_val = sin(angle);
 	cos_val = cos(angle);
 
-	vecor_2d_copy(&temp, vec);
+	vector_2d_copy(&temp, vec);
 
 	/* Apply rotation matrix */
 	vec->x = (cos_val * temp.x) - (sin_val * temp.y);
 	vec->y = (sin_val * temp.x) + (cos_val * temp.y);
 }
 
-struct vector_2d *vecor_2d_copy(struct vector_2d *opt_res, struct vector_2d *vec)
+struct vector_2d *vector_2d_copy(struct vector_2d *opt_res, struct vector_2d *vec)
 {
 	struct vector_2d *res;
 
@@ -109,3 +111,30 @@ double vector_2d_abs(struct vector_2d *vec)
 	}
 	return len;
 }
+
+double vector_2d_calculate_angle_between(struct vector_2d *a, struct vector_2d *b)
+{
+	double cos_angle;
+
+	if (!a || !b)
+		return 0.0;
+
+	cos_angle = ABS_DBL(vector_2d_scalar_multipy(a, b)) / (vector_2d_abs(a) * vector_2d_abs(b));
+	return acos(cos_angle);
+}
+
+void vector_2d_subtract(struct vector_2d *res, struct vector_2d *a, struct vector_2d *b)
+{
+	if (res && a && b) {
+		res->x = a->x - b->x;
+		res->y = a->y - b->y;
+	}
+}
+
+void vector_2d_add(struct vector_2d *res, struct vector_2d *a, struct vector_2d *b)
+{
+	if (res && a && b) {
+		res->x = a->x +b->x;
+		res->y = a->y + b->y;
+	}
+}

trigonometric/vector-operations.h

@@ -26,19 +26,25 @@
 #ifndef _VECTOR_OPERATIONS_H_
 #define _VECTOR_OPERATIONS_H_
 
+#include <math.h>
+
 struct vector_2d {
     double x;
     double y;
 };
 
+#define DEG2RAD(a) ((a)*M_PI/180.0)
 
 double vector_2d_scalar_multipy(struct vector_2d *a, struct vector_2d *b);
 void vector_2d_normalize(struct vector_2d *vec);
-void vecor_2d_rotate(struct vector_2d *vec, double angle);
+void vector_2d_rotate(struct vector_2d *vec, double angle);
-struct vector_2d *vecor_2d_copy(struct vector_2d *opt_res, struct vector_2d *vec);
+struct vector_2d *vector_2d_copy(struct vector_2d *opt_res, struct vector_2d *vec);
 struct vector_2d *vector_2d_alloc(void);
 void vector_2d_free(struct vector_2d *vec);
 void vector_2d_scale(struct vector_2d *vec, double scale);
 double vector_2d_abs(struct vector_2d *vec);
+double vector_2d_calculate_angle_between(struct vector_2d *a, struct vector_2d *b);
+void vector_2d_subtract(struct vector_2d *res, struct vector_2d *a, struct vector_2d *b);
+void vector_2d_add(struct vector_2d *res, struct vector_2d *a, struct vector_2d *b);
 
 #endif /* _VECTOR_OPERATIONS_H_ */