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Help => General => Topic started by: Nabeel Rehman on May 01, 2017, 10:19:23 am

Title: Tank Line of Sight
Post by: Nabeel Rehman on May 01, 2017, 10:19:23 am

Hi guys, i'm working on a 2D tank game in which i have to find if user tank is in position with enemy tank in x or y plane. Here's my code.

bool Enemy::lineOfSight_HOR()
{
        int x = e_enemySprite.getPosition().x;
        int y = e_enemySprite.getPosition().y;

       
                for (int i = y; i < VideoMode::getDesktopMode().width; i++)
                {
                        if (i == userTankPos->y)
                        {
                                return true;
                                break;
                        }
                }
       
        return false;
}

Buts it's not working properly, enemy tank moves even if y-point of user tank is greater than enemy tank.  ???

Title: Re: Tank Line of Sight
Post by: Hapax on May 01, 2017, 05:06:01 pm

It's going to be true if the user tank's y is the same or greater than the enemy's y since you loop upwards from the enemy's y.
Presuming your positions are integers, the test would just be:

if (y == userTankPos->y)

without the loop, with which, by the way, you are using the desktop's width as a boundary (you probably meant height)

(click to show/hide)

bool Enemy::lineOfSight_HOR()
{
        int x = e_enemySprite.getPosition().x;
        int y = e_enemySprite.getPosition().y;

        if (y == userTankPos->y)
        {
                return true;
        }
       
        return false;
}

Title: Re: Tank Line of Sight
Post by: Martin Sand on May 02, 2017, 11:01:25 pm

Where is

userTankPos

coming from? I assume it is not part of the Enemy class/object so it is probably undefined and therefore never gonna match the condition.