wall.h

00001 #pragma once
00002 
00003 // Forward declarations
00004 struct Physics;
00005 struct Entity;
00006 
00007 /**
00008  * Structure to represent a Wall in the arena.
00009  *
00010  * This structure is a ArenaElement; its first data element is an integer (type)
00011  * whose value is always WALL.
00012  */
00013 struct Wall {
00014     int type;
00015     int direction;
00016     int x, y;
00017     int length;
00018     float bounce;
00019     int should_draw;
00020 };
00021 
00022 // Directions
00023 #define HORIZONTAL  0
00024 #define VERTICAL    1
00025 
00026 /**
00027  * Allocate and initialize a new wall object.
00028  *
00029  * @param[in] direction The direction of the wall (HORIZONTAL or VERTICAL)
00030  * @param[in] x         The x location of the origin of the wall
00031  * @param[in] y         The y location of the origin of the wall
00032  * @param[in] length    The length of the wall. (HORIZONTAL = right, VERTICAL = down)
00033  * @param[in] bounce    The coefficient of bounciness for the wall. Between 0 and 1.
00034  * @return              The newly initialized wall.
00035  */
00036 Wall* create_wall(int direction, int x, int y, int length, float bounce);
00037 
00038 /**
00039  * Computes the physics update for a wall.
00040  *
00041  * @param[out] phys The result physics update. Assumed valid at function start.
00042  * @param[in]  ball The ball to update
00043  * @param[in]  wall The wall to bounce off of
00044  * @param[in]  delta The elapsed time, in seconds, since the previous update
00045  */
00046 void do_wall(Physics* next, const Physics* curr, Wall* wall, float delta);
00047 
00048 /**
00049  * Draws a given wall to the screen.
00050  *
00051  * @param[in] wall  The wall to draw
00052  */
00053 void draw_wall(Wall* wall);