72 lines
1.7 KiB
GDScript
72 lines
1.7 KiB
GDScript
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extends Node2D
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# This demo is an example of controling a high number of 2D objects with logic and collision without using scene nodes.
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# This technique is a lot more efficient than using instancing and nodes, but requires more programming and is less visual
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# Member variables
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const BULLET_COUNT = 500
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const SPEED_MIN = 20
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const SPEED_MAX = 50
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var bullets = []
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var shape
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# Inner classes
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class Bullet:
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var pos = Vector2()
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var speed = 1.0
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var body = RID()
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func _draw():
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var t = preload("res://bullet.png")
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var tofs = -t.get_size()*0.5
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for b in bullets:
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draw_texture(t, b.pos + tofs)
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func _process(delta):
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var width = get_viewport_rect().size.x*2.0
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var mat = Matrix32()
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for b in bullets:
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b.pos.x -= b.speed*delta
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if (b.pos.x < -30):
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b.pos.x += width
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mat.o = b.pos
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Physics2DServer.body_set_state(b.body, Physics2DServer.BODY_STATE_TRANSFORM, mat)
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update()
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func _ready():
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shape = Physics2DServer.shape_create(Physics2DServer.SHAPE_CIRCLE)
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Physics2DServer.shape_set_data(shape, 8) # Radius
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for i in range(BULLET_COUNT):
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var b = Bullet.new()
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b.speed = rand_range(SPEED_MIN, SPEED_MAX)
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b.body = Physics2DServer.body_create(Physics2DServer.BODY_MODE_KINEMATIC)
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Physics2DServer.body_set_space(b.body, get_world_2d().get_space())
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Physics2DServer.body_add_shape(b.body, shape)
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b.pos = Vector2(get_viewport_rect().size * Vector2(randf()*2.0, randf())) # Twice as long
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b.pos.x += get_viewport_rect().size.x # Start outside
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var mat = Matrix32()
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mat.o = b.pos
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Physics2DServer.body_set_state(b.body, Physics2DServer.BODY_STATE_TRANSFORM, mat)
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bullets.append(b)
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set_process(true)
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func _exit_tree():
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for b in bullets:
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Physics2DServer.free_rid(b.body)
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Physics2DServer.free_rid(shape)
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bullets.clear()
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