Make AI shoot when player is in line of sight

[tvz]

Hello,
I am working on a platformer in which we use guns, frags, etc.
How can i make AI/computer shoot only when player comes in line of sight . If there is any object breaking the line of sight of AI then it should not shoot/fire and this applies for both directions.
Please help

[skydereign]

Have you looked at this? http://game-editor.com/forum/viewtopic.php?f=6&t=6067&p=42535

You need some way of determining line of sight, and then simply use an if statement in the actor's draw (or similar).

[tvz]

Thankyou
but I did not understand only one function in his code

Code: Select all

float xspeed;
float yspeed;

void gothisway(float ang,float speed)
{
xspeed=-cos(degtorad(ang))*speed;
yspeed=sin(degtorad(ang))*speed;
}


I don't know how to USE cos, sin, degtorad functions and what they do.
May you please tell me their use

[CrackedP0t]

cos() is Cosine, sin() is Sine. Cosine and Sine are used in trigonometry, if you didn't know, and have to to with determining side lengths of right triangles from angles. degtorad() is converting degrees to radians. I can explain a little trigonometry if you'd like, but if you really want a good understanding, you need to take a class on it.

[tvz]

Thankyou for your reply
I know about these sin and cos, these are used in right triangles to find the lengths of sides etc, but I did not understand what that code is doing in above post.

[lcl]

By looking at the code, it seems to be designed to make it possible to move an actor to a desired direction without using angle & directional_velocity but just by manipulating it's x and y coordinates or by using xvelocity and yvelocity.
What the function does, is to get the correct modification values for x and y and then storing them to variables xspeed and yspeed.

[tvz]

Now i understand what this code does.
Thanks
sin^2(θ)+cos^2(θ)
for you all