Fixed transparent background in ResizeCanvas dialog

It was always square, even on non-square image dimensions.

CHANGELOG.md

@@ -19,6 +19,7 @@ Darshan Phaldesai (luiq54), Igor Santarek (jegor377), rob-a-bolton, Kinwailo
 - You can now preview how the frames of the spritesheet you are importing will look.
 - You can now import image files as layers. Their size will be cropped to the project's size.
 - You can import image files as brushes, patterns and palettes.
+- Added "Copy", "Paste" and "Delete" options in the Edit menu. ([#281](https://github.com/Orama-Interactive/Pixelorama/pull/281))
 - Selection region and size are now being shown when making a selection on the top, next to the position label. ([#281](https://github.com/Orama-Interactive/Pixelorama/pull/281))
 
 ### Changed

src/UI/Dialogs/PreviewDialog.gd

@@ -127,8 +127,8 @@ func spritesheet_frame_value_changed(value : int, vertical : bool) -> void:
 		var scale_ratio = image.get_size().y / image_size_y
 		image_size_x = image.get_size().x / scale_ratio
 
-	var offset_x = (300 - image_size_x) / 2
+	var offset_x = (texture_rect.rect_size.x - image_size_x) / 2
-	var offset_y = (300 - image_size_y) / 2
+	var offset_y = (texture_rect.rect_size.y - image_size_y) / 2
 
 	if value > 1:
 		var line_distance

src/UI/Dialogs/ResizeCanvas.gd

@@ -39,8 +39,8 @@ func _on_ResizeCanvas_about_to_show() -> void:
 		layer_i += 1
 	image.unlock()
 
-	update_preview()
 	preview_rect.get_node("TransparentChecker").rect_size = preview_rect.rect_size
+	update_preview()
 
 
 func _on_ResizeCanvas_confirmed() -> void:
@@ -86,3 +86,18 @@ func update_preview() -> void:
 	var preview_texture := ImageTexture.new()
 	preview_texture.create_from_image(preview_image, 0)
 	preview_rect.texture = preview_texture
+	update_transparent_background_size(preview_image)
+
+
+func update_transparent_background_size(preview_image : Image) -> void:
+	var image_size_y = preview_rect.rect_size.y
+	var image_size_x = preview_rect.rect_size.x
+	if preview_image.get_size().x > preview_image.get_size().y:
+		var scale_ratio = preview_image.get_size().x / image_size_x
+		image_size_y = preview_image.get_size().y / scale_ratio
+	else:
+		var scale_ratio = preview_image.get_size().y / image_size_y
+		image_size_x = preview_image.get_size().x / scale_ratio
+
+	preview_rect.get_node("TransparentChecker").rect_size.x = image_size_x
+	preview_rect.get_node("TransparentChecker").rect_size.y = image_size_y

src/UI/Dialogs/ResizeCanvas.tscn

@@ -6,6 +6,7 @@
 [node name="ResizeCanvas" type="ConfirmationDialog"]
 margin_right = 200.0
 margin_bottom = 114.0
+resizable = true
 script = ExtResource( 1 )
 
 [node name="VBoxContainer" type="VBoxContainer" parent="."]
@@ -116,8 +117,10 @@ margin_top = 172.0
 margin_right = 200.0
 margin_bottom = 372.0
 rect_min_size = Vector2( 200, 200 )
+size_flags_horizontal = 0
+size_flags_vertical = 0
 expand = true
-stretch_mode = 6
+stretch_mode = 5
 
 [node name="TransparentChecker" parent="VBoxContainer/Preview" instance=ExtResource( 2 )]
 show_behind_parent = true