Added nearest neighbour rotation

Prefabs/Dialogs/RotateImage.gd

@@ -9,7 +9,7 @@ func _ready():
 	texture.flags = 0
 	aux_img = Image.new()
 	$VBoxContainer/HBoxContainer2/OptionButton.add_item("Rotxel")
-	pass
+	$VBoxContainer/HBoxContainer2/OptionButton.add_item("Nearest neighbour")
 
 func set_sprite(sprite : Image):
 	aux_img.copy_from(sprite)
@@ -19,10 +19,7 @@ func set_sprite(sprite : Image):
 
 
 func _on_HSlider_value_changed(value):
-	var sprite : Image = Image.new()
+	rotate()
-	sprite.copy_from(aux_img)
-	Global.rotxel(sprite,value*PI/180)
-	texture.create_from_image(sprite, 0)
 	$VBoxContainer/HBoxContainer/SpinBox.value = $VBoxContainer/HBoxContainer/HSlider.value
 
 
@@ -35,3 +32,17 @@ func _on_RotateImage_confirmed():
 	Global.rotxel(layer,$VBoxContainer/HBoxContainer/HSlider.value*PI/180)
 	Global.canvas.handle_redo("Draw")
 	$VBoxContainer/HBoxContainer/HSlider.value = 0
+	
+func rotate():
+	var sprite : Image = Image.new()
+	sprite.copy_from(aux_img)
+	match $VBoxContainer/HBoxContainer2/OptionButton.text:
+		"Rotxel":
+			Global.rotxel(sprite,$VBoxContainer/HBoxContainer/HSlider.value*PI/180)
+		"Nearest neighbour":
+			Global.nn_rotate(sprite,$VBoxContainer/HBoxContainer/HSlider.value*PI/180)
+	texture.create_from_image(sprite, 0)
+
+
+func _on_OptionButton_item_selected(id):
+	rotate()

Prefabs/Dialogs/RotateImage.tscn

@@ -75,5 +75,6 @@ margin_right = 229.0
 margin_bottom = 24.0
 max_value = 359.0
 [connection signal="confirmed" from="." to="." method="_on_RotateImage_confirmed"]
+[connection signal="item_selected" from="VBoxContainer/HBoxContainer2/OptionButton" to="." method="_on_OptionButton_item_selected"]
 [connection signal="value_changed" from="VBoxContainer/HBoxContainer/HSlider" to="." method="_on_HSlider_value_changed"]
 [connection signal="value_changed" from="VBoxContainer/HBoxContainer/SpinBox" to="." method="_on_SpinBox_value_changed"]

Scripts/Global.gd

@@ -670,6 +670,13 @@ func scale3X(sprite : Image, tol : float = 50) -> Image:
 	return scaled
 
 func rotxel(sprite : Image, angle : float):
+	
+	# If angle is simple, then nn rotation is the best
+	
+	if angle == 0 || angle == PI/2 || angle == PI || angle == 2*PI:
+		nn_rotate(sprite, angle)
+		return
+	
 	var aux : Image = Image.new()
 	aux.copy_from(sprite)
 	var center : Vector2 = Vector2(sprite.get_width()/2, sprite.get_height()/2)
@@ -772,7 +779,26 @@ func rotxel(sprite : Image, angle : float):
 			sprite.set_pixel(x, y, p)
 	sprite.unlock()
 	aux.unlock()
-
+	
+func nn_rotate(sprite : Image, angle : float):
+	var aux : Image = Image.new()
+	aux.copy_from(sprite)
+	sprite.lock()
+	aux.lock()
+	var ox: int
+	var oy: int
+	var center : Vector2 = Vector2(sprite.get_width()/2, sprite.get_height()/2)
+	for x in range(sprite.get_width()):
+		for y in range(sprite.get_height()):
+			ox = (x - center.x)*cos(angle) + (y - center.y)*sin(angle) + center.x
+			oy = -(x - center.x)*sin(angle) + (y - center.y)*cos(angle) + center.y
+			if ox >= 0 && ox < sprite.get_width() && oy >= 0 && oy < sprite.get_height():
+				sprite.set_pixel(x, y, aux.get_pixel(ox, oy))
+			else:
+				sprite.set_pixel(x, y, Color(0,0,0,0))
+	sprite.unlock()
+	aux.unlock()
+	
 func similarColors(c1 : Color, c2 : Color, tol : float = 100) -> bool:
 	var dist = colorDistance(c1, c2) 
 	return dist <= tol