260 lines
5.9 KiB
GDScript
260 lines
5.9 KiB
GDScript
extends RigidBody2D
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# Character Demo, written by Juan Linietsky.
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#
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# Implementation of a 2D Character controller.
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# This implementation uses the physics engine for
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# controlling a character, in a very similar way
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# than a 3D character controller would be implemented.
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#
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# Using the physics engine for this has the main
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# advantages:
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# -Easy to write.
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# -Interaction with other physics-based objects is free
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# -Only have to deal with the object linear velocity, not position
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# -All collision/area framework available
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#
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# But also has the following disadvantages:
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#
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# -Objects may bounce a little bit sometimes
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# -Going up ramps sends the chracter flying up, small hack is needed.
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# -A ray collider is needed to avoid sliding down on ramps and
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# undesiderd bumps, small steps and rare numerical precision errors.
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# (another alternative may be to turn on friction when the character is not moving).
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# -Friction cant be used, so floor velocity must be considered
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# for moving platforms.
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var anim=""
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var siding_left=false
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var jumping=false
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var stopping_jump=false
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var shooting=false
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var WALK_ACCEL = 800.0
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var WALK_DEACCEL= 800.0
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var WALK_MAX_VELOCITY= 200.0
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var GRAVITY = 700.0
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var AIR_ACCEL = 200.0
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var AIR_DEACCEL= 200.0
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var JUMP_VELOCITY=460
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var STOP_JUMP_FORCE=900.0
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var MAX_FLOOR_AIRBORNE_TIME = 0.15
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var airborne_time=1e20
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var shoot_time=1e20
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var MAX_SHOOT_POSE_TIME = 0.3
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var bullet = preload("res://bullet.xml")
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var floor_h_velocity=0.0
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var enemy
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func _integrate_forces(s):
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var lv = s.get_linear_velocity()
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var step = s.get_step()
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var new_anim=anim
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var new_siding_left=siding_left
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# Get the controls
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var move_left = Input.is_action_pressed("move_left")
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var move_right = Input.is_action_pressed("move_right")
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var jump = Input.is_action_pressed("jump")
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var shoot = Input.is_action_pressed("shoot")
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var spawn = Input.is_action_pressed("spawn")
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if spawn:
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var e = enemy.instance()
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var p = get_pos()
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p.y = p.y - 100
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e.set_pos(p)
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get_parent().add_child(e)
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#deapply prev floor velocity
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lv.x-=floor_h_velocity
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floor_h_velocity=0.0
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# Find the floor (a contact with upwards facing collision normal)
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var found_floor=false
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var floor_index=-1
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for x in range(s.get_contact_count()):
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var ci = s.get_contact_local_normal(x)
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if (ci.dot(Vector2(0,-1))>0.6):
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found_floor=true
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floor_index=x
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# A good idea when impementing characters of all kinds,
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# Compensates for physics imprecission, as well as human
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# reaction delay.
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if (shoot and not shooting):
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shoot_time=0
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var bi = bullet.instance()
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var ss
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if (siding_left):
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ss=-1.0
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else:
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ss=1.0
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var pos = get_pos() + get_node("bullet_shoot").get_pos()*Vector2(ss,1.0)
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bi.set_pos(pos)
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get_parent().add_child(bi)
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bi.set_linear_velocity( Vector2(800.0*ss,-80) )
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get_node("sprite/smoke").set_emitting(true)
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get_node("sound").play("shoot")
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PS2D.body_add_collision_exception(bi.get_rid(),get_rid()) # make bullet and this not collide
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else:
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shoot_time+=step
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if (found_floor):
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airborne_time=0.0
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else:
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airborne_time+=step #time it spent in the air
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var on_floor = airborne_time < MAX_FLOOR_AIRBORNE_TIME
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# Process jump
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if (jumping):
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if (lv.y>0):
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#set off the jumping flag if going down
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jumping=false
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elif (not jump):
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stopping_jump=true
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if (stopping_jump):
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lv.y+=STOP_JUMP_FORCE*step
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if (on_floor):
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# Process logic when character is on floor
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if (move_left and not move_right):
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if (lv.x > -WALK_MAX_VELOCITY):
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lv.x-=WALK_ACCEL*step
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elif (move_right and not move_left):
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if (lv.x < WALK_MAX_VELOCITY):
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lv.x+=WALK_ACCEL*step
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else:
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var xv = abs(lv.x)
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xv-=WALK_DEACCEL*step
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if (xv<0):
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xv=0
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lv.x=sign(lv.x)*xv
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#Check jump
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if (not jumping and jump):
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lv.y=-JUMP_VELOCITY
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jumping=true
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stopping_jump=false
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get_node("sound").play("jump")
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#check siding
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if (lv.x < 0 and move_left):
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new_siding_left=true
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elif (lv.x > 0 and move_right):
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new_siding_left=false
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if (jumping):
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new_anim="jumping"
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elif (abs(lv.x)<0.1):
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if (shoot_time<MAX_SHOOT_POSE_TIME):
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new_anim="idle_weapon"
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else:
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new_anim="idle"
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else:
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if (shoot_time<MAX_SHOOT_POSE_TIME):
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new_anim="run_weapon"
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else:
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new_anim="run"
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else:
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# Process logic when the character is in the air
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if (move_left and not move_right):
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if (lv.x > -WALK_MAX_VELOCITY):
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lv.x-=AIR_ACCEL*step
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elif (move_right and not move_left):
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if (lv.x < WALK_MAX_VELOCITY):
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lv.x+=AIR_ACCEL*step
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else:
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var xv = abs(lv.x)
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xv-=AIR_DEACCEL*step
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if (xv<0):
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xv=0
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lv.x=sign(lv.x)*xv
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if (lv.y<0):
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if (shoot_time<MAX_SHOOT_POSE_TIME):
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new_anim="jumping_weapon"
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else:
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new_anim="jumping"
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else:
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if (shoot_time<MAX_SHOOT_POSE_TIME):
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new_anim="falling_weapon"
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else:
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new_anim="falling"
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#Update siding
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if (new_siding_left!=siding_left):
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if (new_siding_left):
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get_node("sprite").set_scale( Vector2(-1,1) )
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else:
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get_node("sprite").set_scale( Vector2(1,1) )
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siding_left=new_siding_left
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#Change animation
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if (new_anim!=anim):
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anim=new_anim
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get_node("anim").play(anim)
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shooting=shoot
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# Apply floor velocity
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if (found_floor):
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floor_h_velocity=s.get_contact_collider_velocity_at_pos(floor_index).x
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lv.x+=floor_h_velocity
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#Finally, apply gravity and set back the linear velocity
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lv+=s.get_total_gravity()*step
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s.set_linear_velocity(lv)
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func _ready():
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# Initalization here
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# if !Globals.has_singleton("Facebook"):
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# return
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# var Facebook = Globals.get_singleton("Facebook")
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# var link = Globals.get("facebook/link")
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# var icon = Globals.get("facebook/icon")
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# var msg = "I just sneezed on your wall! Beat my score and Stop the Running nose!"
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# var title = "I just sneezed on your wall!"
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# Facebook.post("feed", msg, title, link, icon)
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enemy = ResourceLoader.load("res://enemy.xml")
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pass
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