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Gary Tierney
e5a6638e2f
Implements a new MobExtension plugin which adds 'follow', and 'chase' mixins that allow the mob to follow behind another mob, and chase them while keeping at a safe distance to fire projectiles. Also adds a new public method 'raycast' to CollisionManager, for drawing a line through the world using bresenham's line algorithm whille checking for any impenetrable objects.
59 lines
1.5 KiB
Ruby
Executable File
59 lines
1.5 KiB
Ruby
Executable File
on :message, :walk do |player, msg|
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player.reset_interacting_mob
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end
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on :message, :player_action do |player, msg|
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## todo: need a better way of mapping option numbers to their purpose
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player.follow($world.player_repository.get(msg.index)) if msg.option == 3
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end
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##
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# A <code>MobExtension</code> for making a <code>Mob</code> trail behind, or chase a given mob.
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module FollowingMobExtension
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##
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# Follow a mob and trail behind them.
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def follow(mob)
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do_follow(self, mob, behind: true)
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end
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##
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# Chase a mob (with the intention of getting in front of them), also optionally
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# stopping within a projectile distance when at a position where a projectile can
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# reach the target.
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def chase(mob, projectile_distance: nil)
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do_follow(self, mob, front: true, projectile_distance: projectile_distance)
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end
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end
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MobExtension::register(FollowingMobExtension)
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private
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def do_follow(source, mob, behind: false, front: false, projectile_distance: nil)
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source.interacting_mob = mob
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schedule 0, true do |task|
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# stop the task unless we're still interacting with the other mob.
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unless self.interacting_mob.eql? mob
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task.stop
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next
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end
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next unless source.walking_queue.size <= 1
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distance = mob.position.get_distance(source.position)
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unless projectile_distance.nil?
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next if distance <= projectile_distance &&
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$world.collision_manager.raycast(source.position, mob.position)
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end
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if distance > 15
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reset_interacting_mob
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end
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walk_to(mob, behind: behind, front: front)
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end
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end
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