Extend LdPointArray.

liblogdiag/ld-canvas.c

@@ -1064,7 +1064,7 @@ check_terminals (LdCanvas *self, gdouble x, gdouble y)
 		LdDiagramSymbol *diagram_symbol;
 		LdSymbol *symbol;
 		const LdPointArray *terminals;
-		gint i;
+		guint i;
 
 		if (!LD_IS_DIAGRAM_SYMBOL (iter->data))
 			continue;
@@ -1079,7 +1079,7 @@ check_terminals (LdCanvas *self, gdouble x, gdouble y)
 
 		terminals = ld_symbol_get_terminals (symbol);
 
-		for (i = 0; i < terminals->num_points; i++)
+		for (i = 0; i < terminals->length; i++)
 		{
 			LdPoint cur_term;
 			gdouble distance;

liblogdiag/ld-diagram-connection.c

@@ -168,22 +168,23 @@ ld_diagram_connection_get_points (LdDiagramConnection *self)
 	storage = ld_diagram_object_get_storage (LD_DIAGRAM_OBJECT (self));
 	node = json_object_get_member (storage, "points");
 	if (!node || json_node_is_null (node))
-		return ld_point_array_new (0);
+		return ld_point_array_new ();
 	if (!JSON_NODE_HOLDS_ARRAY (node))
 	{
 		WARN_NODE_TYPE (node, LD_TYPE_POINT_ARRAY);
-		return ld_point_array_new (0);
+		return ld_point_array_new ();
 	}
 
 	array = json_node_get_array (node);
 	point_node_list = json_array_get_elements (array);
-	points = ld_point_array_new (json_array_get_length (array));
+	points = ld_point_array_sized_new (json_array_get_length (array));
 
-	points->num_points = 0;
 	for (iter = point_node_list; iter; iter = g_list_next (iter))
 	{
-		if (read_point_node (iter->data, &points->points[points->num_points]))
-			points->num_points++;
+		g_assert (points->length < points->size);
+
+		if (read_point_node (iter->data, &points->points[points->length]))
+			points->length++;
 	}
 	return points;
 }
@@ -267,7 +268,7 @@ ld_diagram_connection_set_points (LdDiagramConnection *self,
 
 	storage = ld_diagram_object_get_storage (LD_DIAGRAM_OBJECT (self));
 	array = json_array_new ();
-	for (i = 0; i < points->num_points; i++)
+	for (i = 0; i < points->length; i++)
 	{
 		point_array = json_array_new ();
 		json_array_add_double_element (point_array, points->points[i].x);

liblogdiag/ld-lua.c

@@ -576,15 +576,14 @@ read_terminals (lua_State *L, int index, LdPointArray **terminals)
 {
 	LdPointArray *points;
 	size_t num_points;
-	unsigned i = 0;
 
 	num_points = lua_objlen (L, index);
-	points = ld_point_array_new (num_points);
+	points = ld_point_array_sized_new (num_points);
 
 	lua_pushnil (L);
 	while (lua_next (L, index) != 0)
 	{
-		g_assert (i < num_points);
+		g_assert (points->length < points->size);
 
 		if (!lua_istable (L, -1) || lua_objlen (L, -1) != 2)
 			goto read_terminals_fail;
@@ -592,16 +591,16 @@ read_terminals (lua_State *L, int index, LdPointArray **terminals)
 		lua_rawgeti (L, -1, 1);
 		if (!lua_isnumber (L, -1))
 			goto read_terminals_fail;
-		points->points[i].x = lua_tonumber (L, -1);
+		points->points[points->length].x = lua_tonumber (L, -1);
 		lua_pop (L, 1);
 
 		lua_rawgeti (L, -1, 2);
 		if (!lua_isnumber (L, -1))
 			goto read_terminals_fail;
-		points->points[i].y = lua_tonumber (L, -1);
+		points->points[points->length].y = lua_tonumber (L, -1);
 
 		lua_pop (L, 2);
-		i++;
+		points->length++;
 	}
 	*terminals = points;
 	return TRUE;

liblogdiag/ld-types.c

@@ -9,6 +9,7 @@
  */
 
 #include <math.h>
+#include <string.h>
 
 #include "liblogdiag.h"
 #include "config.h"
@@ -102,22 +103,34 @@ ld_point_distance (LdPoint *self, gdouble x, gdouble y)
 
 /**
  * ld_point_array_new:
- * @num_points: the number of points the array can store.
  *
- * Create a new array of points and initialize.
+ * Create a new #LdPointArray.
  *
- * Return value: an #LdPointArray structure.
+ * Return value: (transfer full): an #LdPointArray structure.
  */
 LdPointArray *
-ld_point_array_new (gint num_points)
+ld_point_array_new (void)
+{
+	return ld_point_array_sized_new (0);
+}
+
+/**
+ * ld_point_array_sized_new:
+ * @preallocated: the number of points preallocated.
+ *
+ * Create a new #LdPointArray and preallocate storage for @preallocated items.
+ *
+ * Return value: (transfer full): an #LdPointArray structure.
+ */
+LdPointArray *
+ld_point_array_sized_new (guint preallocated)
 {
 	LdPointArray *new_array;
 
-	g_return_val_if_fail (num_points >= 1, NULL);
-
 	new_array = g_slice_new (LdPointArray);
-	new_array->num_points = num_points;
-	new_array->points = g_malloc0 (num_points * sizeof (LdPoint));
+	new_array->length = 0;
+	new_array->size = preallocated;
+	new_array->points = g_malloc0 (preallocated * sizeof (LdPoint));
 	return new_array;
 }
 
@@ -128,7 +141,7 @@ ld_point_array_new (gint num_points)
  * Makes a copy of the structure.
  * The result must be freed by ld_point_array_free().
  *
- * Return value: a copy of @self.
+ * Return value: (transfer full): a copy of @self.
  */
 LdPointArray *
 ld_point_array_copy (const LdPointArray *self)
@@ -138,9 +151,9 @@ ld_point_array_copy (const LdPointArray *self)
 	g_return_val_if_fail (self != NULL, NULL);
 
 	new_array = g_slice_new (LdPointArray);
-	new_array->num_points = self->num_points;
-	new_array->points = g_memdup (self->points,
-		self->num_points * sizeof (LdPoint));
+	new_array->length = self->length;
+	new_array->size = self->size;
+	new_array->points = g_memdup (self->points, self->size * sizeof (LdPoint));
 	return new_array;
 }
 
@@ -159,6 +172,106 @@ ld_point_array_free (LdPointArray *self)
 	g_slice_free (LdPointArray, self);
 }
 
+/**
+ * ld_point_array_insert:
+ * @self: an #LdPointArray structure.
+ * @points: an array of points to be inserted.
+ * @pos: the position at which the points should be inserted. This number
+ *       must not be bigger than the number of points already present
+ *       in the array. Negative values append to the array.
+ * @length: count of points in @points.
+ *
+ * Insert points into the array.
+ */
+void
+ld_point_array_insert (LdPointArray *self, LdPoint *points,
+	gint pos, guint length)
+{
+	guint new_size;
+
+	g_return_if_fail (self != NULL);
+	g_return_if_fail (points != NULL);
+	g_return_if_fail (pos <= (signed) self->length);
+
+	new_size = self->size ? self->size : 1;
+	while (self->length + length > new_size)
+		new_size <<= 1;
+	if (new_size != self->size)
+		ld_point_array_set_size (self, new_size);
+
+	if (pos < 0)
+		pos = self->length;
+
+	g_memmove (self->points + pos + length, self->points + pos,
+		(self->length - pos) * sizeof (LdPoint));
+	memcpy (self->points + pos, points, length * sizeof (LdPoint));
+	self->length += length;
+}
+
+/**
+ * ld_point_array_remove:
+ * @self: an #LdPointArray structure.
+ * @pos: the position at which the points should be removed.
+ *       Negative values are relative to the end of the array.
+ * @length: count of points to remove.
+ *
+ * Remove points from the array. The array may be resized as a result.
+ */
+void
+ld_point_array_remove (LdPointArray *self, gint pos, guint length)
+{
+	guint new_size;
+
+	g_return_if_fail (self != NULL);
+
+	if (pos < 0)
+	{
+		pos += self->length;
+		if (pos < 0)
+		{
+			length += pos;
+			pos = 0;
+		}
+	}
+	if ((unsigned) pos >= self->length)
+		return;
+	if (pos + length > self->length)
+		length = self->length - pos;
+
+	g_memmove (self->points + pos, self->points + pos + length,
+		(self->length - pos) * sizeof (LdPoint));
+	self->length -= length;
+
+	new_size = self->size;
+	while (new_size >> 2 > self->length)
+		new_size >>= 1;
+	if (new_size != self->size)
+		ld_point_array_set_size (self, new_size);
+}
+
+/**
+ * ld_point_array_set_size:
+ * @self: an #LdPointArray structure.
+ * @size: the new size.
+ *
+ * Change size of the array.
+ */
+void ld_point_array_set_size (LdPointArray *self, guint size)
+{
+	g_return_if_fail (self != NULL);
+
+	if (self->size == size)
+		return;
+
+	self->points = g_realloc (self->points, size * sizeof (LdPoint));
+	if (self->length > size)
+		self->length = size;
+	if (self->size < size)
+		memset (self->points + self->length, 0, size - self->length);
+
+	self->size = size;
+}
+
 /**
  * ld_rectangle_copy:
  * @self: an #LdRectangle structure.

liblogdiag/ld-types.h

@@ -45,21 +45,28 @@ gdouble ld_point_distance (LdPoint *self, gdouble x, gdouble y);
 /**
  * LdPointArray:
  * @points: an array of #LdPoint structures.
- * @num_points: count of points in @points.
+ * @length: count of points in @points.
+ * @size: how many points can be stored in @points.
  *
  * Defines an array of points.
  */
 struct _LdPointArray
 {
 	LdPoint *points;
-	gint num_points;
+	guint length;
+	guint size;
 };
 
 GType ld_point_array_get_type (void) G_GNUC_CONST;
 
-LdPointArray *ld_point_array_new (gint num_points);
+LdPointArray *ld_point_array_new (void);
+LdPointArray *ld_point_array_sized_new (guint preallocated);
 LdPointArray *ld_point_array_copy (const LdPointArray *self);
 void ld_point_array_free (LdPointArray *self);
+void ld_point_array_insert (LdPointArray *self, LdPoint *points,
+	gint pos, guint length);
+void ld_point_array_remove (LdPointArray *self, gint pos, guint length);
+void ld_point_array_set_size (LdPointArray *self, guint size);
 
 
 /**