Small pointer improvements (removed some double pointers that weren't needed)

include/vertex.h

@@ -32,8 +32,8 @@ struct Vertex *new_vertex(int number, int x, int y);
  * @param parent The parent vertex to add the new one to.
  * @param child  The child vertex.
  */
-void add_vertex(struct Vertex **head, struct Vertex **parent,
+void add_vertex(struct Vertex *head, struct Vertex *parent,
-                struct Vertex **child);
+                struct Vertex *child);
 
 /**
  * Frees a single vertex. This does not free it's next and previous pointers.

src/main.c

@@ -24,27 +24,23 @@ void chapter1() {
     struct Vertex *v16 = new_vertex(16, -2, 9);
     struct Vertex *v17 = new_vertex(17, 5, 5);
 
-    // TODO: You may be able to change this back to normal as long as you're
+    add_vertex(v0, v0, v1);
-    //       using -> to set the value on the struct. This is interpreted
+    add_vertex(v0, v1, v2);
-    //       as (*thing).xyz so you are doing too much work on pointers
+    add_vertex(v0, v2, v3);
-    //       in this.
+    add_vertex(v0, v3, v4);
-    add_vertex(&v0, &v0, &v1);
+    add_vertex(v0, v4, v5);
-    add_vertex(&v0, &v1, &v2);
+    add_vertex(v0, v5, v6);
-    add_vertex(&v0, &v2, &v3);
+    add_vertex(v0, v6, v7);
-    add_vertex(&v0, &v3, &v4);
+    add_vertex(v0, v7, v8);
-    add_vertex(&v0, &v4, &v5);
+    add_vertex(v0, v8, v9);
-    add_vertex(&v0, &v5, &v6);
+    add_vertex(v0, v9, v10);
-    add_vertex(&v0, &v6, &v7);
+    add_vertex(v0, v10, v11);
-    add_vertex(&v0, &v7, &v8);
+    add_vertex(v0, v11, v12);
-    add_vertex(&v0, &v8, &v9);
+    add_vertex(v0, v12, v13);
-    add_vertex(&v0, &v9, &v10);
+    add_vertex(v0, v13, v14);
-    add_vertex(&v0, &v10, &v11);
+    add_vertex(v0, v14, v15);
-    add_vertex(&v0, &v11, &v12);
+    add_vertex(v0, v15, v16);
-    add_vertex(&v0, &v12, &v13);
+    add_vertex(v0, v16, v17);
-    add_vertex(&v0, &v13, &v14);
-    add_vertex(&v0, &v14, &v15);
-    add_vertex(&v0, &v15, &v16);
-    add_vertex(&v0, &v16, &v17);
 
     init_ear(v0);
 
@@ -52,8 +48,6 @@ void chapter1() {
 
     triangulate(v0);
 
-    //print_polygon(v0);
-
     free_polygon(&v0);
 }
 

src/vertex.c

@@ -18,13 +18,13 @@ struct Vertex *new_vertex(int number, int x, int y)
     return newv;
 }
 
-void add_vertex(struct Vertex **head, struct Vertex **parent,
+void add_vertex(struct Vertex *head, struct Vertex *parent,
-                struct Vertex **child)
+                struct Vertex *child)
 {
-    (*parent)->next = *child;
+    parent->next = child;
-    (*child)->prev  = *parent;
+    child->prev  = parent;
-    (*child)->next  = *head;
+    child->next  = head;
-    (*head)->prev   = *child;
+    head->prev   = child;
 };
 
 void free_vertex(struct Vertex *vertex)
@@ -57,7 +57,6 @@ void print_vertex(const struct Vertex *vertex)
 void print_polygon(const struct Vertex *head) {
     const struct Vertex *v = head->next;
 
-    printf("-------");
     while(v != head) {
         print_vertex(v);
         v = v->next;