Ranged Fire

[wehttam13]

I am making a game that uses 50*50 pixels(rpg) where a character walks around(so far). He needs to be able to shoot at things, based on the range of his rifle. I have determined how to make a line travel from him to the enemy. But, I need to determine the range at what it is.

i.e.
if it travels up 4 x's, and 4 y squares, then the range should be 4.
if it travles across 4 x's, and 0 y's, then the range is 4.
if it travels up 3 x's, and 2 y's, then the range should be 3.

anybody have any help?

[jamieoboth]

Is the game 3D or flat?
Is it top down, or 1st person?
Is there more than one enemy at a time attacking? SOO MANY QUESTIONS UNANSWERED!

[jamieoboth]

If it is 3D, you could put 4 lines to the center of the person/target. Then, the further away the target is, the smaller the gap between the 4 lines is. Measuring between them, you could work out how many times the results need to be times by. (I think). It seems OK in my mind, but I am a loony...

[Killerguppy101]

Have you tried using formulas to determine the range?

Range=sqrt((x1-x2)^2+(y1-y2)^2)
ex: if your guy was at 10,5 and the enemy was at 20,10 then the range would be about 11.

This is basically the pythagorean theorem, just rearanged a bit.

[Sastraxi]

Actually jamieoboth, he did answer the 2D/3D question. Number of enemies does not matter, and since it is a 2D RPG it is obviously top-down, or another viewpoint that won't change based on where the character is. He answered the 2D by specifying the number of pixels (50x50).

I would suggest the pythagorean theorum as Killerguppy has suggested. A good bit of code, that!

[wehttam13]

it works, thanks very much.

such complicated formulas, where do you come up with these things?

[Arbiter]

School, believe it or not. Occaisionaly something we were taught comes in handy.

Look up pythagoras to see how simple it really is...

Most things in games can be made using really simple things (or combinations of simple things).

[DarkMoose]

if ya dont like/know math, then yer not gonna make it as a programmer ^^ ever hear someone complain during trig class "when are we ever gonna use this crap :p " ? well, here it is :) math is one of my fave classes.. its english and history that i'm still wonderin when i'm ever gonna use :]

[plenderj]

You could use this function that I'm using in a game I wrote

'' What is the distance between two given set of co-ordinates ?
Private Function DistanceBetweenTwoPoints(point1 As CoOrd_type, point2 As CoOrd_type) As Single
    DistanceBetweenTwoPoints = (((point2.X - point1.X) ^ 2) + ((point2.Y - point1.Y) ^ 2)) ^ 0.5
End Function

CoOrd_type is a UDT that just as a .x and a .y member