Hey all
Im working on a simple 2d asteroids game at the moment. I have most
of it working but there is one part that aint working the way id
like. Basically whats happening is that when the up key(thrust) is
not being pressed that the ship should slow down to a stop. in the
direction it was going. Here is the code im using at the moment
using Borland Builder 6.
struct vector{
float x;
float y;
};
const int SHIP_NUM_POINTS=4; //number of points in ship's polygon
struct Ship{
vector points[SHIP_NUM_POINTS]; //points of ship's polygon
vector position;
vector velocity;
vector direction; // direction ship is currently pointing
//vector pos[SHIP_NUM_POINTS];
float rateOfAccel; // how fast can we accelerate
float friction; // how fast do we slow down
float rotation; // how fast do we spin
int radius; // the size of the circle which
contains the ship
bool alive; // whether the ship is alive or dead
}theShip;
the following is in a function to update the ship that is called
from a timer
else if(theKeys.up == false)
{
if (ship.velocity.x > 0)
{
ship.velocity.x = ship->velocity.x - .5;
if (ship->velocity.x < 0)
{
ship->velocity.x = 0;
}
}
else if (ship.velocity.x < 0)
{
ship.velocity.x = ship->velocity.x + .5;
if (ship->velocity.x > 0)
{
ship->velocity.x = 0;
}
}
if (ship.velocity.y > 0)
{
ship.velocity.y = ship->velocity.y - .5;
if (ship->velocity.y < 0)
{
ship->velocity.y = 0;
}
}
else if (ship.velocity.y < 0)
{
ship.velocity.y = ship->velocity.y + .5;
if (ship->velocity.y > 0)
{
ship->velocity.y = 0;
}
}
}
im trying to get the ships position to continue in the direction it
was going but just slow down.. this code does slow it down but
eventually one of the velocity co ordinates reaches 0 first which
makes the ship move while slowing down along that axis..
not sure if ive given enough info to show what im trying to do so if
someone whats me to email the project to get a better understanding
let me know
thanks
g
