Hello, I'm trying to develop a game in which there will be some enemies chasing the player on a map, and on this map there will be some obstacles.
I know how to code a simple AI in order to have enemies follow the player, by using math trigonometry functions like sine, cosine and arctangent; but I ACTUALLY HAVE NO IDEA about how to code an enemy AI in order to make it avoiding some obstacles on the screen.
Basically I'd like to code a simple AI that could chase the player on the map, but at the right time when it's about to collide with an obstacle could forget for a moment that chase and dodge the obstacle.
Do you have an idea about what I should try to implement ?
At the moment I've tried something very simple that tries to rotate around an obstacles while the trajectory between the enemy and the obstacle and the trajectory between the enemy and the player is equal or greater than 90 degrees. It's a really simple trick but it doesn't work 100% of the time.
This is my code:
function _init()
-- initialize
-- enemy
e = {}
e.f = 1
e.x = 0
e.y = 0
-- player
p = {}
p.found = false
p.distance_b = 0
p.f = 2
p.x = 118
p.y = 118
-- columns
bb = {}
b1 = {}
b1.f = 3
b1.x = 40
b1.y = 40
b2 = {}
b2.f = 3
b2.x = 80
b2.y = 80
add(bb, b1)
add(bb, b2)
end
function object_collide_with(x1, y1, x2, y2, gx, gy)
-- checks if an object has collided
-- with another object, then calculated
-- the angle between the ball and the other object
-- gx = gravity horizontal center
-- gy = gravity vertical center
if (gx == nil) gx = 4 -- 8x8 --> 8/2
if (gy == nil) gy = 4
--local bump = c1 and c2 and c3 and c4
local distance = sqrt(((x2+gx)-(x1+gx))^2 + ((y2+gy)-(y1+gy))^2)
local angle = atan2((x1 + gx) - (x2 + gx), (y1 + gy) - (y2 + gy))
local direction = flr(angle * 8)
return distance, angle, direction
end
function player_collide_with(x, y, w, h)
-- checks if the player has collided
-- with another object, then calculated
-- the angle between the ball and the other object
return object_collide_with(p.x, p.y, x, y, w, h)
end
function distance_between(x1, y1, x2, y2)
-- calculates the distance between two points
return sqrt((x2-x1)^2 + (y2-y1)^2)
end
function check_player()
if (btn(0)) p.x -= 1
if (btn(1)) p.x += 1
if (btn(2)) p.y -= 1
if (btn(3)) p.y += 1
end
function _update()
check_player()
p.found = false
local distance, angle, direction
-- check the distance from the target
distance, angle, direction = player_collide_with(e.x, e.y)
for i, b in pairs(bb) do
local distance_b, angle_b, direction_b = object_collide_with(b.x, b.y, e.x, e.y)
if distance_b <= 10 and abs(angle-angle_b) < 1/6 then
angle_b += 3.1415/240
e.x = b.x - cos(angle_b) * distance_b
e.y = b.y - sin(angle_b) * distance_b
p.found = true
break
end
end
if not p.found then
e.x += cos(angle)
e.y += sin(angle)
end
if distance_between(e.x, e.y, p.x, p.y) < 8 then
-- reset if the enemy touches the player
e.x = 0
e.y = 0
end
end
function _draw()
cls(0)
for i, b in pairs(bb) do
spr(b.f, b.x, b.y)
end
spr(p.f, p.x, p.y)
spr(e.f, e.x, e.y)
end
|
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