GML Curved Hitscan

[Dragula5892]

Hello everyone, I know i've seen this somewhere, but i figured i'd try to get it back to life, and i also am trying to figure out how to do this myself for a weapon that would simply look awesome with curved hitscan lines going around the place , i already know how to do hitscan weapons, my question is, how would i make it curve or coil around to an close by enemy before hitting them within the instant it's drawn? I'm making a side scrolling shooter, and my enemies spawn in waves, so it'd be cool for the gun to randomly curve and hit a random enemy, i already have something like this in place as a projectile weapon, but i want it to be more instant

 

[SyntheticStorm9]

Probably something like:


in create event

alarm[0] = 5
spd = ?



in alarm[0]

motion_set(choose(0, 45, 90, 135, 180, 225, 270, 315),spd/2);
alarm[0] = 5

in step
if distance_to_object(obj_enemy) >10
{
move_towards point(obj_enemy)

if collision_point(x,y,obj_enemy)
{
instance_destroy()
}
}

 

[Dragula5892]

Probably something like:


in create event

alarm[0] = 5
spd = ?



in alarm[0]

motion_set(choose(0, 45, 90, 135, 180, 225, 270, 315),spd/2);
alarm[0] = 5

in step
if distance_to_object(obj_enemy) >10
{
move_towards point(obj_enemy)
}

hitscans take place in the draw event, that's for a projectile weapon, which i already have, here's a basic hitscan weapon completely coded out for you guys to use if you wish

//Create event:

fire=false
timer=0
wait=0
wep=0
ammo=100

//Step Event:

If wait>=1 {wait-=1}

If wait=0
{
if timer>=1
{
timer-=1
}
}

If timer<=0 {timer=0}

If timer=0
{
If fire=true {fire=false}
}

If ammo>=100 {ammo=100}

If ammo<=0 {ammo=0}

If mouse_check_button_pressed(mb_left)
{

if wep=0
{
If ammo>=1
{
ammo-=1
If fire=false
{
wait=2
timer=1
fire=true

audio_play_sound(gunshot1,0,0)
}
}
}


}

//Draw Event:

len=0
maxlen=1600

If fire=true
{
while(len<maxlen && !position_meeting(x+lengthdir_x(16,angle),y+lengthdir_y(16,angle),enemy_parent))
{
 
draw_sprite_ext(res_line_8by1,0,x+lengthdir_x(16+len,angle),y+lengthdir_y(16+len,angle),1,1,angle,c_white,1)

len+=8
}
}

var hit=instance_position(x+lengthdir_x(16+len,angle),y+lengthdir_y(16+len,angle),enemy_parent)
 if hit
 {
hit.HP-=1
 }

i'm trying to make it so it's able to curve and coil to a random enemy that's on screen and ahead of my character

 

[SyntheticStorm9]

How about this:



in create event

target = false
alarm[0] = 5
alarm[2] = 0


in alarm[0]

target = true

in step event
if target = false
{
alarm[2] = 3
}


in alarm[2]
motion_set(choose(0, 45, 90, 135, 180, 225, 270, 315),spd/2);


in draw event

if target = true
{
move_to_point(x,y,obj_enemy)
}

draw line behind self

 

[Dragula5892]

How about this:



in create event

target = false
alarm[0] = 5
alarm[2] = 0


in alarm[0]

target = true

in step event
if target = false
{
alarm[2] = 3
}


in alarm[2]
motion_set(choose(0, 45, 90, 135, 180, 225, 270, 315),spd/2);


in draw event

if target = true
{
move_to_point(x,y,obj_enemy)
}

draw line behind self

ok, i just said this, i already have something like this in place i'm looking to create the hitscan alternative, hitscan weapons happen in one frame, dude

 

[SyntheticStorm9]

Oh!! Sorry.

 

[Dragula5892]

Oh!! Sorry.

It's ok, the code i posted above is the code for a hitscan weapon

 

[amusudan]

You might want to look into parabolas (I'm not sure how they're called) to get the correct formula for a curved line (which you can use for the actual hitscan collision checks and drawing it (in a loop, of diddly course))

 

[Dragula5892]

You might want to look into parabolas (I'm not sure how they're called) to get the correct formula for a curved line (which you can use for the actual hitscan collision checks and drawing it (in a loop, of diddly course))

Alright, i'll be sure to do so, i know gamemaker takes a lot of math to do the simplest of things at times

 

[Dragula5892]

You might want to look into parabolas (I'm not sure how they're called) to get the correct formula for a curved line (which you can use for the actual hitscan collision checks and drawing it (in a loop, of diddly course))

alright, i got a start, here's my current code

//Step Event:
keyboard_check(ord("Z"))
{

 if fire=false
 {
 timer=2
 audio_play_sound(bullet_fire,0,0)
 fire=true
 rand=random_range(-2,2)
 rand2=random_range(-.005,.005)
 }
}

//Draw Event:
len=0
maxlen=1600

if fire=true
{
while (len<maxlen && !position_meeting(x+lengthdir_x(len,0),y+lengthdir_y(len,0-rand),enemy_parent))
{

draw_point_colour(x+lengthdir_x(len,0),y+lengthdir_y(len,0-rand),c_lime)

rand-=rand2
len+=4
}

var hit=collision_point(x+lengthdir_x(len,0),y+lengthdir_y(len,0-rand),enemy_parent,1,1)

if hit
{
 instance_create(x+lengthdir_x(len,0),y+lengthdir_y(len,0-rand),tracker)
}
}

how would i make it have more curves along the way, and maybe even have full loops completely randomly?

 

[sp202]

I think a path is the easiest thing to do. When do you want the bullet to curve towards an enemy? When it's within a certain distance? Add a path point at the player, add a path point at the enemy location and a third between them with an offset and draw the path as a curve.

 

[Dragula5892]

I think a path is the easiest thing to do. When do you want the bullet to curve towards an enemy? When it's within a certain distance? Add a path point at the player, add a path point at the enemy location and a third between them with an offset and draw the path as a curve.

ok, you may have to give me a small example, i'm toying with it as we speak, but how do i set a path as a collision point?

 

[sp202]

The path is just for graphical effect. I think tracking a parabola is overkill, just pick an instance within range of the regular collision_line.

 

[Dragula5892]

The path is just for graphical effect. I think tracking a parabola is overkill, just pick an instance within range of the regular collision_line.

i'm kinda done with the tracking part, i'm just trying to make it look cooler, more random curves and the like, other than that, it's pretty decent, and hits very randomly, like i initially wanted