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149 lines
3.6 KiB
Plaintext
149 lines
3.6 KiB
Plaintext
/// "Tugs" an atom towards another atom. That is to say, it will visually
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/// pixel offset to look like it is close to the point it's tugging to,
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/// but not actually move position.
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/datum/component/tug_towards
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// If multiple are specified, will tug in between them.
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dupe_mode = COMPONENT_DUPE_UNIQUE_PASSARGS
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VAR_PRIVATE
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/// atom -> strength
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list/list/tugging_to_targets = list()
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current_tug_offset_x = 0
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current_tug_offset_y = 0
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/datum/component/tug_towards/Initialize(
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/// The atom we are tugging towards.
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atom/tugging_to,
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/// Strength of the tug, as a number 0 through 1.
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/// 0 means no tug, 1 means that if you're on an adjacent tile
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/// you will be directly at the corner of the tugging_to_target.
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/// Default is 0.8, which provides a healthy amount of
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/// distance.
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strength
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)
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if (!isatom(parent))
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return COMPONENT_INCOMPATIBLE
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ASSERT(istype(tugging_to))
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add_tugging_to_target(tugging_to, strength)
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RegisterSignals(parent, list(
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COMSIG_MOVABLE_MOVED,
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COMSIG_MOB_BUCKLED,
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COMSIG_MOB_UNBUCKLED,
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), PROC_REF(update_tug))
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/datum/component/tug_towards/Destroy(force)
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tugging_to_targets.Cut()
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if(isliving(parent))
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var/mob/living/living_parent = parent
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living_parent.remove_offsets(REF(src))
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else
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animate(
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parent,
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pixel_x = -current_tug_offset_x,
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pixel_y = -current_tug_offset_y,
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time = 0.2 SECONDS,
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flags = ANIMATION_RELATIVE
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)
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return ..()
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/datum/component/tug_towards/InheritComponent(
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datum/component/tug_towards/new_tug_towards,
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i_am_original,
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atom/tugging_to,
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strength,
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)
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add_tugging_to_target(tugging_to, strength)
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/datum/component/tug_towards/proc/remove_tug_target(atom/target)
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tugging_to_targets -= target
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if (tugging_to_targets.len == 0)
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qdel(src)
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else
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update_tug()
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/datum/component/tug_towards/proc/add_tugging_to_target(
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atom/tugging_to,
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strength = 0.8,
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)
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PRIVATE_PROC(TRUE)
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tugging_to_targets[tugging_to] = strength
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RegisterSignal(tugging_to, COMSIG_PREQDELETED, PROC_REF(on_tugging_to_qdeleting))
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RegisterSignal(tugging_to, COMSIG_MOVABLE_MOVED, PROC_REF(update_tug))
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update_tug()
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/datum/component/tug_towards/proc/on_tugging_to_qdeleting(datum/target)
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SIGNAL_HANDLER
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PRIVATE_PROC(TRUE)
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tugging_to_targets -= target
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if (tugging_to_targets.len == 0)
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qdel(src)
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else
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update_tug()
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/datum/component/tug_towards/proc/update_tug()
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SIGNAL_HANDLER
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PRIVATE_PROC(TRUE)
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if(QDELETED(src))
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return // another movement call could have deleted us
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var/atom/atom_parent = parent
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var/mob/mob_parent = parent
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var/total_tug_x = 0
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var/total_tug_y = 0
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if (!istype(mob_parent) || !mob_parent.buckled)
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var/tuggers = 0
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for (var/atom/target as anything in tugging_to_targets)
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if (target.z != atom_parent.z)
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continue
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tuggers += 1
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var/strength = tugging_to_targets[target]
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total_tug_x += sign(target.x - atom_parent.x) * strength
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total_tug_y += sign(target.y - atom_parent.y) * strength
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// Intentionally not trig--something at a corner with a strength of 1 should have
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// you at the corner, rather than root(2).
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total_tug_x /= tuggers
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total_tug_y /= tuggers
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var/half_size = world.icon_size * 0.5
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total_tug_x *= half_size
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total_tug_y *= half_size
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if (total_tug_x == current_tug_offset_x && total_tug_y == current_tug_offset_y)
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return
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if(isliving(mob_parent))
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var/mob/living/living_parent = mob_parent
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living_parent.add_offsets(REF(src), x_add = total_tug_x, y_add = total_tug_y)
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else
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animate(
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atom_parent,
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pixel_x = -current_tug_offset_x + total_tug_x,
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pixel_y = -current_tug_offset_y + total_tug_y,
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time = 0.2 SECONDS,
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flags = ANIMATION_RELATIVE
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)
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current_tug_offset_x = total_tug_x
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current_tug_offset_y = total_tug_y
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