Move Relative to Rotation Help

[pikachurian]

How would I make the player move relative to their rotation in a top down game?

 

[BattleRifle BR55]

How are you turning them? If you're using image_angle:

x += lenthdir_x(_speed_,image_angle);
y += lenthdir_y(_speed_,image_angle);

 

[pikachurian]

I am using direction. I am think of a fps style of movement where w a s d moves the player relative to their direction. Also, what's the best way of implementing collision with this style of movement?

 

[rytan451]

Then instead of using image_angle in BattleRifle's code, you use direction.

If you're moving left (so the player is pressing A), then you're moving 90 degrees counterclockwise from forwards, so you should add 90 degrees to the second parameter. Likewise, moving right is -90 degrees counterclockwise (or 270 degrees clockwise) and backwards is 180 degrees counterclockwise.

(By the way, the functions were misspelled: they're lengthdir_x and lengthdir_y.)

 

[TheouAegis]

You could use speed, but just be aware of how GM handles it. As soon as you set speed, at the start of the End Step event you will move in the direction of direction.

 

[pikachurian]

Thanks for the replies. I tried using the lengthdir functions but it wasn't working properly. Here's the player's code:

///CREATE

spd = 2
hspd = 0
vspd = 0

rotateSpd = 3//30
rspd = 0

/// STEP:
hspd = -keyboard_check(ord("A")) + keyboard_check(ord("D"))
vspd = -keyboard_check(ord("S")) + keyboard_check(ord("W"))
hspd *= spd
vspd *= spd

//direction = point_direction(x,y,mouse_x,mouse_y)
rspd = keyboard_check(ord("A")) + -keyboard_check(ord("D"))
direction += rspd * rotateSpd
image_angle = direction

if(keyboard_check(ord("W")))speed = 2
else if(keyboard_check(ord("S")))speed = -2
else speed = 0

//Collisions
var _nX = x+lengthdir_x(hspd,direction-45)
if(place_meeting(_nX,y,obj_wall))
{
    while(!place_meeting(x+lengthdir_x(sign(hspd),direction-45),y,obj_wall))
    {
        x += lengthdir_x(sign(hspd),direction-45)
    }
    _nX = 0
    hspd = 0
}
x += lengthdir_x(hspd,direction-45)
//
var _nY = y+lengthdir_y(vspd,direction+45)
if(place_meeting(x,_nY,obj_wall))
{
    while(!place_meeting(x,y+lengthdir_y(sign(vspd),direction+45),obj_wall))
    {
        y += lengthdir_y(sign(vspd),direction+45)
    }
    _nY = 0
    vspd = 0
}
y += lengthdir_y(vspd,direction+45)