Added 2 rotation algorithms and popup for rotating current layer

Prefabs/Dialogs/RotateImage.gd

@@ -0,0 +1,56 @@
+extends ConfirmationDialog
+
+var texture : ImageTexture
+var aux_img : Image
+var layer : Image
+
+func _ready():
+	texture = ImageTexture.new()
+	texture.flags = 0
+	aux_img = Image.new()
+	$VBoxContainer/HBoxContainer2/OptionButton.add_item("Rotxel")
+	$VBoxContainer/HBoxContainer2/OptionButton.add_item("Nearest neighbour")
+
+func set_sprite(sprite : Image):
+	aux_img.copy_from(sprite)
+	layer = sprite
+	texture.create_from_image(aux_img, 0)
+	$VBoxContainer/TextureRect.texture = texture
+
+
+func _on_HSlider_value_changed(value):
+	rotate()
+	$VBoxContainer/HBoxContainer/SpinBox.value = $VBoxContainer/HBoxContainer/HSlider.value
+
+
+func _on_SpinBox_value_changed(value):
+	$VBoxContainer/HBoxContainer/HSlider.value = $VBoxContainer/HBoxContainer/SpinBox.value
+
+
+func _on_RotateImage_confirmed():
+	Global.canvas.handle_undo("Draw")
+	match $VBoxContainer/HBoxContainer2/OptionButton.text:
+		"Rotxel":
+			Global.rotxel(layer,$VBoxContainer/HBoxContainer/HSlider.value*PI/180)
+		"Nearest neighbour":
+			Global.nn_rotate(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()
+
+
+func _on_RotateImage_about_to_show():
+	$VBoxContainer/HBoxContainer/HSlider.value = 0

Prefabs/Dialogs/RotateImage.tscn

@@ -0,0 +1,81 @@
+[gd_scene load_steps=2 format=2]
+
+[ext_resource path="res://Prefabs/Dialogs/RotateImage.gd" type="Script" id=1]
+
+[node name="RotateImage" type="ConfirmationDialog"]
+margin_right = 245.0
+margin_bottom = 241.0
+window_title = "Confirmá, por favor..."
+script = ExtResource( 1 )
+__meta__ = {
+"_edit_use_anchors_": false
+}
+
+[node name="VBoxContainer" type="VBoxContainer" parent="."]
+anchor_right = 1.0
+anchor_bottom = 1.0
+margin_left = 8.0
+margin_top = 8.0
+margin_right = -8.0
+margin_bottom = -36.0
+__meta__ = {
+"_edit_use_anchors_": false
+}
+
+[node name="TextureRect" type="TextureRect" parent="VBoxContainer"]
+margin_right = 229.0
+margin_bottom = 145.0
+size_flags_vertical = 3
+expand = true
+stretch_mode = 6
+
+[node name="HBoxContainer2" type="HBoxContainer" parent="VBoxContainer"]
+margin_top = 149.0
+margin_right = 229.0
+margin_bottom = 169.0
+
+[node name="Label" type="Label" parent="VBoxContainer/HBoxContainer2"]
+margin_top = 3.0
+margin_right = 34.0
+margin_bottom = 17.0
+text = "Type:"
+
+[node name="OptionButton" type="OptionButton" parent="VBoxContainer/HBoxContainer2"]
+margin_left = 38.0
+margin_right = 229.0
+margin_bottom = 20.0
+size_flags_horizontal = 3
+size_flags_vertical = 3
+
+[node name="HBoxContainer" type="HBoxContainer" parent="VBoxContainer"]
+margin_top = 173.0
+margin_right = 229.0
+margin_bottom = 197.0
+
+[node name="Label" type="Label" parent="VBoxContainer/HBoxContainer"]
+margin_top = 5.0
+margin_right = 44.0
+margin_bottom = 19.0
+text = "Angle: "
+
+[node name="HSlider" type="HSlider" parent="VBoxContainer/HBoxContainer"]
+margin_left = 48.0
+margin_right = 151.0
+margin_bottom = 24.0
+size_flags_horizontal = 3
+size_flags_vertical = 3
+max_value = 359.0
+__meta__ = {
+"_edit_use_anchors_": false
+}
+
+[node name="SpinBox" type="SpinBox" parent="VBoxContainer/HBoxContainer"]
+margin_left = 155.0
+margin_right = 229.0
+margin_bottom = 24.0
+max_value = 359.0
+[connection signal="about_to_show" from="." to="." method="_on_RotateImage_about_to_show"]
+[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

@@ -612,6 +612,201 @@ func plot_circle(r : int) -> Array:
 			err += x * 2 + 1
 	return circle_points
 
+func scale3X(sprite : Image, tol : float = 50) -> Image:
+	var scaled = Image.new()
+	scaled.create(sprite.get_width()*3, sprite.get_height()*3, false, Image.FORMAT_RGBA8)
+	scaled.lock()
+	sprite.lock()
+	var a : Color
+	var b : Color
+	var c : Color
+	var d : Color
+	var e : Color
+	var f : Color
+	var g : Color
+	var h : Color
+	var i : Color
+
+	for x in range(1,sprite.get_width()-1):
+		for y in range(1,sprite.get_height()-1):
+			var xs : float = 3*x
+			var ys : float = 3*y
+
+			a = sprite.get_pixel(x-1,y-1)
+			b = sprite.get_pixel(x,y-1)
+			c = sprite.get_pixel(x+1,y-1)
+			d = sprite.get_pixel(x-1,y)
+			e = sprite.get_pixel(x,y)
+			f = sprite.get_pixel(x+1,y)
+			g = sprite.get_pixel(x-1,y+1)
+			h = sprite.get_pixel(x,y+1)
+			i = sprite.get_pixel(x+1,y+1)
+
+			var db : bool = similarColors(d, b, tol)
+			var dh : bool = similarColors(d, h, tol)
+			var bf : bool = similarColors(f, b, tol)
+			var ec : bool = similarColors(e, c, tol)
+			var ea : bool = similarColors(e, a, tol)
+			var fh : bool = similarColors(f, h, tol)
+			var eg : bool = similarColors(e, g, tol)
+			var ei : bool = similarColors(e, i, tol)
+
+			scaled.set_pixel(xs-1, ys-1, d if (db and !dh and !bf) else e )
+			scaled.set_pixel(xs, ys-1, b if (db and !dh and !bf and !ec) or 
+			(bf and !db and !fh and !ea) else e)
+			scaled.set_pixel(xs+1, ys-1, f if (bf and !db and !fh) else e)
+			scaled.set_pixel(xs-1, ys, d if (dh and !fh and !db and !ea) or
+			 (db and !dh and !bf and !eg) else e)
+			scaled.set_pixel(xs, ys, e);
+			scaled.set_pixel(xs+1, ys, f if (bf and !db and !fh and !ei) or
+			(fh and !bf and !dh and !ec) else e)
+			scaled.set_pixel(xs-1, ys+1, d if (dh and !fh and !db) else e)
+			scaled.set_pixel(xs, ys+1, h if (fh and !bf and !dh and !eg) or
+			(dh and !fh and !db and !ei) else e)
+			scaled.set_pixel(xs+1, ys+1, f if (fh and !bf and !dh) else e)
+
+	scaled.unlock()
+	sprite.unlock()
+	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)
+	var ox : int
+	var oy : int
+	var p : Color
+	aux.lock()
+	sprite.lock()
+	for x in range(sprite.get_width()):
+		for y in range(sprite.get_height()):
+			var dx = 3*(x - center.x)
+			var dy = 3*(y - center.y)
+			var found_pixel : bool = false
+			for k in range(9):
+				var i = -1 + k % 3
+				var j = -1 + int(k / 3)
+				var dir = atan2(dy + j, dx + i)
+				var mag = sqrt(pow(dx + i, 2) + pow(dy + j, 2))
+				dir -= angle
+				ox = round(center.x*3 + 1 + mag*cos(dir))
+				oy = round(center.y*3 + 1 + mag*sin(dir))
+
+				if (sprite.get_width() % 2 != 0):
+					ox += 1
+					oy += 1
+
+				if (ox >= 0 && ox < sprite.get_width()*3
+					&& oy >= 0 && oy < sprite.get_height()*3):
+						found_pixel = true
+						break
+
+			if !found_pixel:
+				sprite.set_pixel(x, y, Color(0,0,0,0))
+				continue
+
+			var fil : int = oy % 3
+			var col : int = ox % 3
+			var index : int = col + 3*fil
+
+			ox = round((ox - 1)/3.0);
+			oy = round((oy - 1)/3.0);
+			var a : Color
+			var b : Color
+			var c : Color
+			var d : Color
+			var e : Color
+			var f : Color
+			var g : Color
+			var h : Color
+			var i : Color
+			if (ox == 0 || ox == sprite.get_width() - 1 || 
+				oy == 0 || oy == sprite.get_height() - 1):
+					p = aux.get_pixel(ox, oy)
+			else:
+				a = aux.get_pixel(ox-1,oy-1);
+				b = aux.get_pixel(ox,oy-1);
+				c = aux.get_pixel(ox+1,oy-1);
+				d = aux.get_pixel(ox-1,oy);
+				e = aux.get_pixel(ox,oy);
+				f = aux.get_pixel(ox+1,oy);
+				g = aux.get_pixel(ox-1,oy+1);
+				h = aux.get_pixel(ox,oy+1);
+				i = aux.get_pixel(ox+1,oy+1);
+
+				match(index):
+					0:
+						p = d if (similarColors(d,b) && !similarColors(d,h)
+						 && !similarColors(b,f)) else e;
+					1:
+						p = b if ((similarColors(d,b) && !similarColors(d,h) &&
+						 !similarColors(b,f) && !similarColors(e,c)) ||
+						 (similarColors(b,f) && !similarColors(d,b) && 
+						 !similarColors(f,h) && !similarColors(e,a))) else e;
+					2:
+						p = f if (similarColors(b,f) && !similarColors(d,b) &&
+						 !similarColors(f,h)) else e;
+					3:
+						p = d if ((similarColors(d,h) && !similarColors(f,h) &&
+						 !similarColors(d,b) && !similarColors(e,a)) ||
+						 (similarColors(d,b) && !similarColors(d,h) && 
+						!similarColors(b,f) && !similarColors(e,g))) else e;
+					4: 
+						p = e
+					5:
+						p =  f if((similarColors(b,f) && !similarColors(d,b) &&
+						 !similarColors(f,h) && !similarColors(e,i))
+						 || (similarColors(f,h) && !similarColors(b,f) && 
+						 !similarColors(d,h) && !similarColors(e,c))) else e;
+					6:
+						p = d if (similarColors(d,h) && !similarColors(f,h) && 
+						 !similarColors(d,b)) else e;
+					7:
+						p = h if ((similarColors(f,h) && !similarColors(f,b) &&
+						 !similarColors(d,h) && !similarColors(e,g))
+						 || (similarColors(d,h) && !similarColors(f,h) &&
+						 !similarColors(d,b) && !similarColors(e,i))) else e;
+					8:
+						p = f if (similarColors(f,h) && !similarColors(f,b) &&
+						 !similarColors(d,h)) else e;
+			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
+
+func colorDistance(c1 : Color, c2 : Color) -> float:
+		return sqrt(pow((c1.r - c2.r)*255, 2) + pow((c1.g - c2.g)*255, 2)
+		+ pow((c1.b - c2.b)*255, 2) + pow((c1.a - c2.a)*255, 2))
+
 func _exit_tree() -> void:
 	config_cache.set_value("window", "screen", OS.current_screen)
 	config_cache.set_value("window", "maximized", OS.window_maximized || OS.window_fullscreen)

Scripts/Main.gd

@@ -69,7 +69,8 @@ func _ready() -> void:
 		"Flip Vertical" : KEY_MASK_SHIFT + KEY_V,
 		"Invert colors" : 0,
 		"Desaturation" : 0,
-		"Outline" : 0
+		"Outline" : 0,
+		"Rotate Image" : 0
 		}
 	var help_menu_items := {
 		"View Splash Screen" : 0,
@@ -346,6 +347,10 @@ func image_menu_id_pressed(id : int) -> void:
 			Global.canvas.handle_redo("Draw")
 		6: # Outline
 			$OutlineDialog.popup_centered()
+		7: # Rotate
+			var image : Image = Global.canvas.layers[Global.canvas.current_layer_index][0]
+			$RotateImage.set_sprite(image)
+			$RotateImage.popup_centered()
 
 func help_menu_id_pressed(id : int) -> void:
 	match id: