87 lines
2.5 KiB
GDScript
87 lines
2.5 KiB
GDScript
# VirtualJoystick —— continuous left-thumb movement input.
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extends Control
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signal axis_changed(axis: Vector2)
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const DEAD_ZONE := 0.12
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const KNOB_RADIUS := 29.0
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var _touch_index := -1
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var _axis := Vector2.ZERO
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var _knob := Vector2.ZERO
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func setup(diameter := 164.0) -> void:
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custom_minimum_size = Vector2(diameter, diameter)
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size = Vector2(diameter, diameter)
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mouse_filter = Control.MOUSE_FILTER_STOP
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queue_redraw()
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func axis() -> Vector2:
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return _axis
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func _gui_input(event: InputEvent) -> void:
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if event is InputEventScreenTouch:
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if event.pressed and _touch_index < 0:
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_touch_index = event.index
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_update_from_position(event.position)
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elif not event.pressed and event.index == _touch_index:
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_touch_index = -1
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_set_axis(Vector2.ZERO)
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accept_event()
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return
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if event is InputEventScreenDrag and event.index == _touch_index:
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_update_from_position(event.position)
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accept_event()
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return
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if event is InputEventMouseButton and event.button_index == MOUSE_BUTTON_LEFT:
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if event.pressed:
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_touch_index = -2
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_update_from_position(event.position)
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else:
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_touch_index = -1
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_set_axis(Vector2.ZERO)
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accept_event()
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return
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if event is InputEventMouseMotion and _touch_index == -2:
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_update_from_position(event.position)
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accept_event()
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func _update_from_position(pos: Vector2) -> void:
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var center := size * 0.5
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var radius := maxf(1.0, minf(size.x, size.y) * 0.5 - KNOB_RADIUS - 8.0)
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var delta := pos - center
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var raw := delta / radius
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var magnitude := minf(raw.length(), 1.0)
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var direction := raw.normalized() if magnitude > 0.001 else Vector2.ZERO
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var output := direction * magnitude
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if output.length() < DEAD_ZONE:
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output = Vector2.ZERO
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else:
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output = output.normalized() * ((output.length() - DEAD_ZONE) / (1.0 - DEAD_ZONE))
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_knob = direction * radius * magnitude
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_set_axis(output)
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queue_redraw()
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func _set_axis(value: Vector2) -> void:
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var next := value.limit_length(1.0)
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if next.is_equal_approx(_axis):
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return
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_axis = next
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axis_changed.emit(_axis)
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queue_redraw()
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func cancel_press() -> void:
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_touch_index = -1
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_knob = Vector2.ZERO
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_set_axis(Vector2.ZERO)
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func _draw() -> void:
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var center := size * 0.5
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var outer := minf(size.x, size.y) * 0.5 - 5.0
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if outer <= 0.0:
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return
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draw_circle(center, outer, Color(0.025, 0.04, 0.07, 0.38))
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draw_arc(center, outer, 0.0, TAU, 48, Color(0.72, 0.83, 0.96, 0.42), 2.0)
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draw_circle(center + _knob, KNOB_RADIUS, Color(0.18, 0.3, 0.48, 0.78))
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draw_arc(center + _knob, KNOB_RADIUS, 0.0, TAU, 32, Color(0.7, 0.85, 1.0, 0.8), 2.0)
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