Topic was automatically imported from the old Question2Answer platform.
Asked By
ashish
Hi,
I am trying to draw a polygon with the help of the method drawpolygon method.
The drawpolygon method requires a PoolVector2Array() and PoolColorArray as parameters.
I want to do 3 things:
(a) Draw a rectangle through this method under the virtual function _draw()
(b) Set the colour of the rectangle in consonance with the position of a VSlider node.
(c) Change the colour of the rectangle at runtime by moving the slider position up and down.
I am not sure if I am correctly passing values in the parameters, for I am getting a triangle as opposed to a rectangle. And, neither am I able to get the desired colour nor am I able to change colours by sliding the VSlider at runtime.
Here is my code:
extends Control
onready var slider =$VSlider
func _ready():
slider.value = 100
func _draw():
var col = {}
var points = PoolVector2Array()
var colour = PoolColorArray()
points = [Vector2(100,100), Vector2(200,100), Vector2(200,200),Vector2(100,200)]
colour = [slider.value,1,1,1]
draw_polygon(points,colour)
Draw is called only once when the node enters the tree. Afterwards, you need to call it via update()
The PoolColorArray requires elements of type Color
This code should work:
extends Control
onready var slider =$VSlider
func _ready():
slider.value = 1 # must be between 0 and 1
slider.connect("value_changed", self, "redraw")
func redraw(_value):
update()
func _draw():
var points = PoolVector2Array()
var colour = PoolColorArray()
points = [Vector2(100,100), Vector2(200,100), Vector2(200,200),Vector2(100,200)]
colour = [Color(slider.value,1,1,1)]
draw_polygon(points,colour)
Thank you very much. This works.
I made the slider.value as a fraction of 100 when calling the Color method. The slider was set to 1 to 100 with steps of 1. Therefore, I made it into a fraction of 100.
One question, however:
Why have you put an underscore before value in redraw function? Is that a typical coding style or is it required?
Thanks again.
ashish | 2021-04-08 09:23
Glad it works! Regarding the underscore: It’s used to suppress the editor warning about unused arguments. If you remove it, the code will still work as before, but the editor will show a warning.
