Strange engine behavior.

jetra

Hi! I am testing on some features for my project. So here is very simple minimal test case. Make new project, add Control to scene, save everything, and configure project as

[display] width=64 height=64 stretch_mode="viewport" stretch_aspect="keep"

Next, add script to Control:

# flag for blocking continuous button press var allow_movement = true func _ready(): set_process(true) set_process_input(true) # just resize to someting smaller set_size(Vector2(8, 8)) func _process(delta): # one-shot one-pixel movements if (Input.is_action_pressed("ui_left") && allow_movement): allow_movement = false set_pos(get_pos() + Vector2(-1, 0)) if (Input.is_action_pressed("ui_right") && allow_movement): allow_movement = false set_pos(get_pos() + Vector2(1, 0)) if (Input.is_action_pressed("ui_up") && allow_movement): allow_movement = false set_pos(get_pos() + Vector2(0, -1)) if (Input.is_action_pressed("ui_down") && allow_movement): allow_movement = false set_pos(get_pos() + Vector2(0, 1)) update() func _input(event): # when movement button is released - we are ready to move again if (event.is_action_released("ui_left") ||\ event.is_action_released("ui_right") ||\ event.is_action_released("ui_up") ||\ event.is_action_released("ui_down")): allow_movement = true func _draw(): # draw rectangle at our position draw_rect(Rect2(get_pos(), get_size()), Color(1, 1, 1)) # draw across viewport 1-pixel vertical lines interleaved with pixel line gap for i in range(0, get_viewport().get_rect().size.width, 2): draw_line(Vector2(i, 0), Vector2(i, get_viewport().get_rect().size.height), Color(0, 0, 0, 0.25))

From this i want small pixel world (64x64 pixels), some square able to move pixel-by-pixel on it, and some pattern on background. Then strange things happen. 1. Background moves as i move my square (why? i told it to draw lines based on parent Viewport properties). 2. My square jumps over 2 pixels, instead of 1 (you can just count button presses from edge to edge - 32, not 64) I try different ways to move and different objects - by setting their Rects, Sizes, Pos, Margins - they always move by 2 pixels. Is this a whole lot of strange bugs? Or i'm completely out of understanding engine logic?

							
							
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jetra

Ok. I got, that lines are drawn in Control local coordinate system.But why objects are moved by 2 pixel step?Btw, if you change set_pos and get_pos to set_size and get_size - you'll see that size is changing in 1-pixel steps.

jetra

Guys, why silence?I need to dive in Godot, and i face a brick wall.I have exp in other game engines, but i can't get into this logic.How can i move object in 1-pixel steps?And why this code on Control doesn't work as expected (clicks are registered in strange places, not in AABB)?[code]extends Controlfunc ready(): set_process(true) set_process_input(true)func process(delta): update()func draw(): draw_rect(Rect2(get_pos(), get_size()), Color(1, 0, 0))func input(event): if (event.type == InputEvent.MOUSE_BUTTON && event.button_index == BUTTON_LEFT && event.pressed): if (Rect2(get_pos(), get_size()).has_point(get_global_mouse_pos())): set_pos(get_pos() + Vector2(32, 0))[/code]What's the whole deal with positions? Where am i wrong? I just cannot find answers anywhere.