add follow canvas movement and scale option to transparent checker (#311)

src/Autoload/Global.gd

@@ -57,6 +57,8 @@ var guide_color := Color.purple
 var checker_size := 10
 var checker_color_1 := Color(0.47, 0.47, 0.47, 1)
 var checker_color_2 := Color(0.34, 0.35, 0.34, 1)
+var checker_follow_movement := false
+var checker_follow_scale := false
 
 var autosave_interval := 1.0
 var enable_autosave := true

src/CameraMovement.gd

@@ -5,17 +5,26 @@ var tween : Tween
 var zoom_min := Vector2(0.005, 0.005)
 var zoom_max := Vector2.ONE
 var viewport_container : ViewportContainer
+var transparent_checker : ColorRect
 var mouse_pos := Vector2.ZERO
 var drag := false
 
 
 func _ready() -> void:
 	viewport_container = get_parent().get_parent()
+	transparent_checker = get_parent().get_node("TransparentChecker")
 	tween = Tween.new()
 	add_child(tween)
 	tween.connect("tween_step", self, "_on_tween_step")
+	update_transparent_checker_offset()
 
 
+func update_transparent_checker_offset() -> void:
+	var o = get_global_transform_with_canvas().get_origin()
+	var s = get_global_transform_with_canvas().get_scale()
+	o.y = get_viewport_rect().size.y - o.y
+	transparent_checker.update_offset(o, s)
+
 # Get the speed multiplier for when you've pressed
 # a movement key for the given amount of time
 func dir_move_zoom_multiplier(press_time : float) -> float:
@@ -92,6 +101,7 @@ func process_direction_action_pressed(event: InputEvent) -> void:
 	var this_direction_press_time : float = Global.key_move_press_time[dir]
 	var move_speed := dir_move_zoom_multiplier(this_direction_press_time)
 	offset = offset + move_speed * increment * directional_sign_multipliers[dir] * zoom
+	update_transparent_checker_offset()
 
 
 # Process an action for a release direction action
@@ -117,6 +127,7 @@ func _input(event : InputEvent) -> void:
 			zoom_camera(1)
 		elif event is InputEventMouseMotion && drag:
 			offset = offset - event.relative * zoom
+			update_transparent_checker_offset()
 		elif is_action_direction_pressed(event):
 			process_direction_action_pressed(event)
 		elif is_action_direction_released(event):
@@ -154,6 +165,7 @@ func zoom_camera(dir : int) -> void:
 			zoom = zoom_max
 
 		offset = offset + (-0.5 * viewport_size + mouse_pos) * (prev_zoom - zoom)
+		update_transparent_checker_offset()
 		if name == "Camera2D":
 			Global.zoom_level_label.text = str(round(100 / Global.camera.zoom.x)) + " %"
 		elif name == "CameraPreview":
@@ -163,6 +175,16 @@ func zoom_camera(dir : int) -> void:
 func _on_tween_step(_object: Object, _key: NodePath, _elapsed: float, _value: Object) -> void:
 	Global.horizontal_ruler.update()
 	Global.vertical_ruler.update()
+	update_transparent_checker_offset()
+
+
+func zoom_100():
+	zoom = Vector2.ONE
+	offset = Global.current_project.size / 2
+	update_transparent_checker_offset()
+	Global.zoom_level_label.text = str(round(100 / zoom.x)) + " %"
+	Global.horizontal_ruler.update()
+	Global.vertical_ruler.update()
 
 
 func fit_to_frame(size : Vector2) -> void:
@@ -185,6 +207,7 @@ func fit_to_frame(size : Vector2) -> void:
 
 	zoom = Vector2(1 / ratio, 1 / ratio)
 	offset = size / 2
+	update_transparent_checker_offset()
 	if name == "Camera2D":
 		Global.zoom_level_label.text = str(round(100 / Global.camera.zoom.x)) + " %"
 		Global.horizontal_ruler.update()

src/Preferences/PreferencesDialog.gd

@@ -23,6 +23,8 @@ var preferences = [
 	["checker_size", "Canvas/CheckerOptions/CheckerSizeValue", "value", Global.checker_size],
 	["checker_color_1", "Canvas/CheckerOptions/CheckerColor1", "color", Global.checker_color_1],
 	["checker_color_2", "Canvas/CheckerOptions/CheckerColor2", "color", Global.checker_color_2],
+	["checker_follow_movement", "Canvas/CheckerOptions/CheckerFollowMovement", "pressed", Global.checker_follow_movement],
+	["checker_follow_scale", "Canvas/CheckerOptions/CheckerFollowScale", "pressed", Global.checker_follow_scale],
 ]
 
 var selected_item := 0
@@ -116,7 +118,7 @@ func preference_update(prop : String) -> void:
 	if prop in ["grid_width", "grid_height", "grid_color"]:
 		Global.canvas.update()
 
-	if prop in ["checker_size", "checker_color_1", "checker_color_2"]:
+	if prop in ["checker_size", "checker_color_1", "checker_color_2", "checker_follow_movement", "checker_follow_scale"]:
 		Global.transparent_checker._ready()
 
 	if prop in ["guide_color"]:

src/Preferences/PreferencesDialog.tscn

@@ -356,6 +356,38 @@ hint_tooltip = "Second color of the transparent checker background"
 mouse_default_cursor_shape = 2
 color = Color( 0.341176, 0.34902, 0.341176, 1 )
 
+[node name="Label" type="Label" parent="HSplitContainer/ScrollContainer/VBoxContainer/Canvas/CheckerOptions"]
+margin_top = -181.0
+margin_right = 110.0
+margin_bottom = -167.0
+rect_min_size = Vector2( 110, 0 )
+text = "Follow Canvas Movement"
+
+[node name="CheckerFollowMovement" type="CheckBox" parent="HSplitContainer/ScrollContainer/VBoxContainer/Canvas/CheckerOptions"]
+margin_left = 114.0
+margin_top = -186.0
+margin_right = 161.0
+margin_bottom = -162.0
+hint_tooltip = "The transparent checker follow the movement of canvas "
+mouse_default_cursor_shape = 2
+text = "On"
+
+[node name="Label2" type="Label" parent="HSplitContainer/ScrollContainer/VBoxContainer/Canvas/CheckerOptions"]
+margin_top = -181.0
+margin_right = 110.0
+margin_bottom = -167.0
+rect_min_size = Vector2( 110, 0 )
+text = "Follow Canvas Zoom Level"
+
+[node name="CheckerFollowScale" type="CheckBox" parent="HSplitContainer/ScrollContainer/VBoxContainer/Canvas/CheckerOptions"]
+margin_left = 114.0
+margin_top = -186.0
+margin_right = 161.0
+margin_bottom = -162.0
+hint_tooltip = "The transparent checker follow the zoom level of canvas "
+mouse_default_cursor_shape = 2
+text = "On"
+
 [node name="Image" type="VBoxContainer" parent="HSplitContainer/ScrollContainer/VBoxContainer"]
 visible = false
 margin_top = 240.0

src/Shaders/TransparentChecker.shader

@@ -4,9 +4,24 @@ render_mode unshaded;
 uniform float size = 10.0;
 uniform vec4 color1 : hint_color = vec4(0.7, 0.7, 0.7, 1.0);
 uniform vec4 color2 : hint_color = vec4(1.0);
+uniform vec2 offset = vec2(0.0);
+uniform vec2 scale = vec2(0.0);
+uniform vec2 rect_size = vec2(0.0);
+uniform bool follow_movement = false;
+uniform bool follow_scale = false;
 
 void fragment() {
-	vec2 pos = mod(FRAGCOORD.xy, size * 2.0);
+	vec2 ref_pos = FRAGCOORD.xy;
+	if (follow_scale) {
+		if (!follow_movement)
+			ref_pos /= scale;
+		else
+			ref_pos = UV * rect_size;
+	}
+	else if (follow_movement)
+		ref_pos -= mod(offset, size * 2.0);
+	
+	vec2 pos = mod(ref_pos, size * 2.0);
 	bool c1 = any(lessThan(pos, vec2(size)));
 	bool c2 = any(greaterThanEqual(pos, vec2(size)));
 	float c = c1 && c2 ? 1.0: 0.0;

src/Tools/Zoom.gd

@@ -15,11 +15,7 @@ func _on_FitToFrame_pressed():
 
 
 func _on_100_pressed():
-	Global.camera.zoom = Vector2.ONE
-	Global.camera.offset = Global.current_project.size / 2
-	Global.zoom_level_label.text = str(round(100 / Global.camera.zoom.x)) + " %"
-	Global.horizontal_ruler.update()
-	Global.vertical_ruler.update()
+	Global.camera.zoom_100()
 
 
 func get_config() -> Dictionary:

src/UI/CanvasPreviewContainer.gd

@@ -9,6 +9,7 @@ onready var play_button : Button = $SettingsContainer/VBoxContainer/PlayButton
 func _on_PreviewZoomSlider_value_changed(value : float) -> void:
 	camera.zoom = -Vector2(value, value)
 	camera.save_values_to_project()
+	camera.update_transparent_checker_offset()
 
 
 func _on_PlayButton_toggled(button_pressed : bool) -> void:

src/UI/TransparentChecker.gd

@@ -9,3 +9,14 @@ func _ready() -> void:
 	material.set_shader_param("size", Global.checker_size)
 	material.set_shader_param("color1", Global.checker_color_1)
 	material.set_shader_param("color2", Global.checker_color_2)
+	material.set_shader_param("follow_movement", Global.checker_follow_movement)
+	material.set_shader_param("follow_scale", Global.checker_follow_scale)
+
+
+func update_offset(offset : Vector2, scale : Vector2) -> void:
+	material.set_shader_param("offset", offset)
+	material.set_shader_param("scale", scale)
+
+
+func _on_TransparentChecker_resized():
+	material.set_shader_param("rect_size", rect_size)

src/UI/TransparentChecker.tscn

@@ -15,3 +15,7 @@ margin_right = 40.0
 margin_bottom = 40.0
 mouse_filter = 2
 script = ExtResource( 2 )
+__meta__ = {
+"_edit_use_anchors_": false
+}
+[connection signal="resized" from="." to="." method="_on_TransparentChecker_resized"]