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hello , a long dream of mine is the create a simple Top Down / Isometric shooter, for now i'll try the Top Down shooter.

i dont know a lot on programming , but i do try my best
in the bitmap below , is an example of how the Ling of Sight works in my head ,, the only problem is , that i do not know how to code it





how to do it?

If you are thinking of making this game in 3d(uses 3d models for the top-down view), I would suggest looking into something called Ray casting. The basic idea is that a line comes from one point and moves to another, and stops at the first thing it hits, or at the end. A good library to look into is Sparky's collision. It's faster than GDK's built in collision commands, and has some more things you can do with it(including ray casting).

if you are thinking of doing it in 2d, then you could use an invisible sprite(like a 1x1 with the color being the transparent color) and move it along a line in each direction and stop on the first thing it hits, though this may be slow.

Hope that helps
-H

What I would do something like:

1. Check distance between player and enemy.
If the player is close enough:
2. Compare the angles of the enemy and the player to check if the enemy is facing in the general direction of the player.
3. Do a raycast or some kind of line collision between the player and the enemy.
4. If there was a collision then the player is hidden.
4. If there was not a collision then the player is in sight.