tyler parker
bb1d70c620
Self-contained project code for the "Godot Isn't Just for Games" series: Arduino sketches, the Python serial<->UDP bridge, and the Godot 4 projects, one folder per article.
64 lines
2.3 KiB
GDScript
64 lines
2.3 KiB
GDScript
extends Control
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const TELEMETRY_PORT := 4242
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const COMMAND_ADDR := "127.0.0.1"
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const COMMAND_PORT := 4243
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const ADC_MAX := 1023.0
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const SMOOTH_SPEED := 12.0 # higher = snappier, lower = floatier
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@onready var led_button: Button = $Panel/LedButton
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@onready var pad: Panel = $Panel/Pad
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@onready var dot: ColorRect = $Panel/Pad/Dot
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var _udp_in := PacketPeerUDP.new()
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var _udp_out := PacketPeerUDP.new()
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var _target_x := 512.0 # rest near center so the dot starts in the middle
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var _target_y := 512.0
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var _smoothed_x := 512.0
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var _smoothed_y := 512.0
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var _btn_pressed := false
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var _led_on := false
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const COLOR_DOT_IDLE := Color(0.3, 0.7, 1.0) # cyan
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const COLOR_DOT_PRESSED := Color(0.2, 1.0, 0.4) # green
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func _ready() -> void:
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_udp_in.bind(TELEMETRY_PORT, "127.0.0.1")
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# set_dest_address is the reliable way to *send* with PacketPeerUDP in Godot 4;
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# connect_to_host is aimed at receiving and can silently drop outbound packets.
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_udp_out.set_dest_address(COMMAND_ADDR, COMMAND_PORT)
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led_button.pressed.connect(_on_led_pressed)
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func _process(delta: float) -> void:
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# Drain the queue; the newest packet wins. Format: "x,y,btn" e.g. "512,498,0"
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while _udp_in.get_available_packet_count() > 0:
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var parts := _udp_in.get_packet().get_string_from_utf8().split(",")
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if parts.size() >= 3 and parts[0].is_valid_int() and parts[1].is_valid_int():
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_target_x = float(parts[0])
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_target_y = float(parts[1])
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_btn_pressed = parts[2].strip_edges() == "1"
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# Frame-rate-independent smoothing so the dot glides instead of twitching.
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var t := 1.0 - exp(-SMOOTH_SPEED * delta)
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_smoothed_x = lerpf(_smoothed_x, _target_x, t)
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_smoothed_y = lerpf(_smoothed_y, _target_y, t)
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# Normalize raw ADC (0..1023) to 0..1.
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var nx := clampf(_smoothed_x / ADC_MAX, 0.0, 1.0)
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var ny := clampf(_smoothed_y / ADC_MAX, 0.0, 1.0)
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# Move the dot within the pad. Invert Y so pushing the stick UP moves the dot UP.
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# (If it feels backwards, change "1.0 - ny" to "ny", or swap for X below.)
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var travel := pad.size - dot.size
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dot.position = Vector2(nx * travel.x, (1.0 - ny) * travel.y)
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# Reflect the stick's push-button by recoloring the dot.
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dot.color = COLOR_DOT_PRESSED if _btn_pressed else COLOR_DOT_IDLE
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func _on_led_pressed() -> void:
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_led_on = not _led_on
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_udp_out.put_packet(("L1" if _led_on else "L0").to_utf8_buffer())
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led_button.text = "LED: ON" if _led_on else "LED: OFF"
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