Fixed not being able to draw simple dots with the brush

Fixes mbrlabs#231

docs/changelog.md

@@ -16,6 +16,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Fixed blurry interface on some macOS devices
 - Fixed invisible cursor in some situations
 - Fixed issue where moved brush strokes stayed in their original positions after exporting to SVG
+- Fixed not being able to draw simple dots by just clicking/tapping the brush once
 
 ### Changed
 - Changing the application language does not require a restart now

lorien/BrushStroke/BrushStrokeOptimizer.gd

@@ -13,7 +13,7 @@ func reset() -> void:
 
 # -------------------------------------------------------------------------------------------------
 func optimize(s: BrushStroke) -> void:
-	if s.points.size() < 3:
+	if s.points.size() < 8:
 		return
 
 	var max_angle_diff := ANGLE_THRESHOLD

lorien/InfiniteCanvas/Tools/BrushTool.gd

@@ -4,6 +4,7 @@ extends CanvasTool
 # -------------------------------------------------------------------------------------------------
 const MOVEMENT_THRESHOLD := 1.0
 const MIN_PRESSURE := 0.1
+const DOT_MAX_DISTANCE_THRESHOLD := 4.0
 
 # -------------------------------------------------------------------------------------------------
 export var pressure_curve: Curve
@@ -30,6 +31,9 @@ func tool_event(event: InputEvent) -> void:
 				start_stroke()
 				_first_point = true
 			elif performing_stroke:
+				if _is_stroke_a_dot():
+					_canvas.remove_all_stroke_points()
+					_draw_point()
 				end_stroke()
 
 # -------------------------------------------------------------------------------------------------
@@ -39,14 +43,14 @@ func _process(delta: float) -> void:
 		var diff := _current_position.distance_squared_to(_last_accepted_position)
 		if diff <= MOVEMENT_THRESHOLD || _current_pressure <= MIN_PRESSURE:
 			return
-			
+
 		var sensitivity: float = Settings.get_value(Settings.GENERAL_PRESSURE_SENSITIVITY, Config.DEFAULT_PRESSURE_SENSITIVITY)
 		var point_pressure = pressure_curve.interpolate(_current_pressure) * sensitivity
 		if _first_point:
 			point_pressure *= 1.4
 			_first_point = false
-		var point_position := xform_vector2(_current_position)
 
+		var point_position := xform_vector2(_current_position)
 		add_stroke_point(point_position, point_pressure)
 
 		# If the brush stroke gets too long, we make a new one. This is necessary because Godot limits the number
@@ -58,3 +62,33 @@ func _process(delta: float) -> void:
 
 		_last_accepted_position = _current_position
 
+# -------------------------------------------------------------------------------------------------
+func _is_stroke_a_dot() -> bool:
+	var stroke := get_current_brush_stroke()
+
+	if stroke.points.size() < 2:
+		return true
+
+	if stroke.points.size() == 2:
+		var dist: float = stroke.points[0].distance_to(stroke.points[1])
+		if dist <= DOT_MAX_DISTANCE_THRESHOLD:
+			return true
+
+	if stroke.points.size() <= 6:
+		var dist := 0.0
+		for i in stroke.points.size() - 1:
+			dist += stroke.points[i].distance_to(stroke.points[i + 1])
+		if dist <= DOT_MAX_DISTANCE_THRESHOLD:
+			return true
+
+	return false
+
+# -------------------------------------------------------------------------------------------------
+func _draw_point() -> void:
+	var origin := xform_vector2(_current_position)
+	var pressure = 0.5
+	var offset := 1.5
+
+	add_stroke_point(origin, pressure)
+	add_stroke_point(origin + Vector2(0, offset), pressure)
+	add_stroke_point(origin + Vector2(-offset/2.0, offset/2.0), pressure)