Object to represent a wall that balls bounce off of. More...

#include <TUM_Ball.h>

Collaboration diagram for wall:

Data Fields
signed short	x1

signed short	y1

signed short	w

signed short	h

signed short	x2

signed short	y2

float	dampening

unsigned int	colour

callback_t	callback

void *	args

Detailed Description

Object to represent a wall that balls bounce off of.

A wall object is created by passing the top left X and Y locations (in pixels) and the width and height of the desired wall. The wall also stores a colour that can be used to render it, allowing for the information to be stored in the object. A wall interacts with balls automatically as all walls generated are stored in a list that is iterated though by the function checkBallCollisions.

When a wall is collided with it causes a ball to loose or gain speed, the dampening is a normalized percentage value that is used to either increase or decrease the balls velocity. A dampening of -0.4 represents a 40% decrease in speed, similarly 0.4 represents a 40% increase in speed.

Please be aware that the position of a ball can be tested slower than a ball can move when the ball is moving extremely quickly, this can cause the balls to jump over objects, this is due to the extremely simple collision detection implemented.

A walls callback is a function pointer taking a function of the format void (*callback)(void *). If the function is set the that function is called when the wall is collided with. This allows for actions to be performed when a specific wall is collided with.