HitBox

ID:1923599
 
Aug 23 2015, 3:38 pm
(See the best response by Ter13.)
Code:
HitRange(var/rng=12)
            var/a_x=abs_px()
            var/a_y=abs_py()
            switch(src.dir)
                if(NORTH)
                    return obounds(a_x-(rng/2),a_y+16,rng,rng,src.z)
                    //return obounds(src,0,rng,0)
                if(SOUTH)
                    //return obounds(src,0,-rng,0)
                    return obounds(a_x-(rng/2),a_y-rng,rng,rng,src.z)
                if(EAST)
                    return obounds(a_x+bound_width,a_y-16,rng,rng,src.z)
                    //return obounds(src,rng,0,0)
                if(WEST)
                    //return obounds(src,-rng,0,0)
                    return obounds(a_x-rng,a_y-16,rng,rng,src.z)
                if(SOUTHWEST)
                    //return obounds(src,-round(max(6,rng/2)),-round(max(6,rng/2)),0)
                    //return obounds(a_x-rng,a_y-rng,rng,rng,src.z)
                    return obounds(a_x-TILE_WIDTH,a_y-TILE_HEIGHT,rng,rng,src.z)
                if(SOUTHEAST)
                    //return obounds(src,round(max(6,rng/2)),-round(max(6,rng/2)),0)
                    //return obounds(a_x+bound_width,a_y-rng,rng,rng,src.z)
                    return obounds(a_x+bound_width+TILE_WIDTH,a_y-TILE_HEIGHT,rng,rng,src.z)
                if(NORTHEAST)
                    //return obounds(src,round(max(6,rng/2)),round(max(6,rng/2)),0)
                    return obounds(a_x+bound_width+TILE_WIDTH,a_y+TILE_HEIGHT,rng,rng,src.z)
                if(NORTHWEST)
                    //return obounds(src,-round(max(6,rng/2)),round(max(6,rng/2)),0)
                    return obounds(a_x-TILE_WIDTH,a_y+TILE_HEIGHT,rng,rng,src.z)


Problem description:
TLDR
This is my hit box code. I began trying to improve it a few days ago by using some absolute coodinates.
The idea is to position the "hit area" dynamically based on the size of the box and the direction.

So for instance if I wanted to create a 24x24 size box, and my character is facing RIGHT, it would be positioned to the east of me and slightly to the south.

For the most part this code above works out well, it just seems to be offset unproperly so I was hoping someone could help with the maths.
Aug 23 2015, 4:12 pm
Best response
 
proc
    melee_bounds(atom/movable/ref,dir,dist,width,align)
        var/w,h

        if(istype(ref))
            w = ref.bound_width
            h = ref.bound_height
        else
            w = TILE_WIDTH
            h = TILE_HEIGHT

        switch(dir)
            if(NORTH)
                . = bounds(ref,floor((w-width)/2)+align,h,width-w,dist-h)
            if(SOUTH)
                . = bounds(ref,floor((w-width)/2)+align,-dist,width-w,dist-h)
            if(EAST)
                . = bounds(ref,w,floor((h-width)/2)+align,dist-w,width-h)
            if(WEST)
                . = bounds(ref,-dist,floor((h-width)/2)+align,dist-w,width-h)


This is more or less what you are looking for. If you have a reference object, you don't need to use absolute coordinates. Better to use the offset coordinate formula.
Aug 30 2015, 11:59 pm
I just got back to this.
I am using the object as a reference. I still want to use the absolute coordinates of the object.