1 files changed, 197 insertions, 0 deletions
diff --git a/game/addons/zylann.hterrain/tools/util/interval_slider.gd b/game/addons/zylann.hterrain/tools/util/interval_slider.gd
new file mode 100644
index 0000000..481d08b
--- /dev/null
+++ b/game/addons/zylann.hterrain/tools/util/interval_slider.gd
@@ -0,0 +1,197 @@
+
+# Slider with two handles representing an interval.
+
+@tool
+extends Control
+
+const VALUE_LOW = 0
+const VALUE_HIGH = 1
+const VALUE_COUNT = 2
+
+const FG_MARGIN = 1
+
+signal changed
+
+var _min_value := 0.0
+var _max_value := 1.0
+var _values = [0.2, 0.6]
+var _grabbing := false
+
+
+func _get_property_list():
+	return [
+		{
+			"name": "min_value",
+			"type": TYPE_FLOAT,
+			"usage": PROPERTY_USAGE_EDITOR
+		},
+		{
+			"name": "max_value",
+			"type": TYPE_FLOAT,
+			"usage": PROPERTY_USAGE_EDITOR
+		},
+		{
+			"name": "range",
+			"type": TYPE_VECTOR2,
+			"usage": PROPERTY_USAGE_STORAGE
+		}
+	]
+
+
+func _get(key: StringName):
+	match key:
+		&"min_value":
+			return _min_value
+		&"max_value":
+			return _max_value
+		&"range":
+			return Vector2(_min_value, _max_value)
+
+
+func _set(key: StringName, value):
+	match key:
+		&"min_value":
+			_min_value = min(value, _max_value)
+			queue_redraw()
+		&"max_value":
+			_max_value = max(value, _min_value)
+			queue_redraw()
+		&"range":
+			_min_value = value.x
+			_max_value = value.y
+
+
+func set_values(low: float, high: float):
+	if low > high:
+		low = high
+	if high < low:
+		high = low
+	_values[VALUE_LOW] = low
+	_values[VALUE_HIGH] = high
+	queue_redraw()
+
+
+func set_value(i: int, v: float, notify_change: bool):
+	var min_value = _min_value
+	var max_value = _max_value
+	
+	match i:
+		VALUE_LOW:
+			max_value = _values[VALUE_HIGH]
+		VALUE_HIGH:
+			min_value = _values[VALUE_LOW]
+		_:
+			assert(false)
+	
+	v = clampf(v, min_value, max_value)
+	if v != _values[i]:
+		_values[i] = v
+		queue_redraw()
+		if notify_change:
+			changed.emit()
+
+
+func get_value(i: int) -> float:
+	return _values[i]
+
+
+func get_low_value() -> float:
+	return _values[VALUE_LOW]
+
+
+func get_high_value() -> float:
+	return _values[VALUE_HIGH]
+
+
+func get_ratio(i: int) -> float:
+	return _value_to_ratio(_values[i])
+
+
+func get_low_ratio() -> float:
+	return get_ratio(VALUE_LOW)
+
+
+func get_high_ratio() -> float:
+	return get_ratio(VALUE_HIGH)
+
+
+func _ratio_to_value(r: float) -> float:
+	return r * (_max_value - _min_value) + _min_value
+
+
+func _value_to_ratio(v: float) -> float:
+	if absf(_max_value - _min_value) < 0.001:
+		return 0.0
+	return (v - _min_value) / (_max_value - _min_value)
+
+
+func _get_closest_index(ratio: float) -> int:
+	var distance_low := absf(ratio - get_low_ratio())
+	var distance_high := absf(ratio - get_high_ratio())
+	if distance_low < distance_high:
+		return VALUE_LOW
+	return VALUE_HIGH
+
+
+func _set_from_pixel(px: float):
+	var r := (px - FG_MARGIN) / (size.x - FG_MARGIN * 2.0)
+	var i := _get_closest_index(r)
+	var v := _ratio_to_value(r)
+	set_value(i, v, true)
+
+
+func _gui_input(event: InputEvent):
+	if event is InputEventMouseButton:
+		if event.pressed:
+			if event.button_index == MOUSE_BUTTON_LEFT:
+				_grabbing = true
+				_set_from_pixel(event.position.x)
+		else:
+			if event.button_index == MOUSE_BUTTON_LEFT:
+				_grabbing = false
+				
+	elif event is InputEventMouseMotion:
+		if _grabbing:
+			_set_from_pixel(event.position.x)			
+
+
+func _draw():
+	var grabber_width := 3
+	var background_v_margin := 0
+	var foreground_margin := FG_MARGIN
+	var grabber_color := Color(0.8, 0.8, 0.8)
+	var interval_color := Color(0.4,0.4,0.4)
+	var background_color := Color(0.1, 0.1, 0.1)
+	
+	var control_rect := Rect2(Vector2(), size)
+	
+	var bg_rect := Rect2(
+		control_rect.position.x, 
+		control_rect.position.y + background_v_margin, 
+		control_rect.size.x, 
+		control_rect.size.y - 2 * background_v_margin)
+	draw_rect(bg_rect, background_color)
+	
+	var fg_rect := control_rect.grow(-foreground_margin)
+	
+	var low_ratio := get_low_ratio()
+	var high_ratio := get_high_ratio()
+	
+	var low_x := fg_rect.position.x + low_ratio * fg_rect.size.x
+	var high_x := fg_rect.position.x + high_ratio * fg_rect.size.x
+
+	var interval_rect := Rect2(
+		low_x, fg_rect.position.y, high_x - low_x, fg_rect.size.y)
+	draw_rect(interval_rect, interval_color)
+
+	low_x = fg_rect.position.x + low_ratio * (fg_rect.size.x - grabber_width)
+	high_x = fg_rect.position.x + high_ratio * (fg_rect.size.x - grabber_width)
+	
+	for x in [low_x, high_x]:
+		var grabber_rect := Rect2(
+			x,
+			fg_rect.position.y,
+			grabber_width,
+			fg_rect.size.y)
+		draw_rect(grabber_rect, grabber_color)
+