Legacy GM Depending on the distance between the object variables it will be more visible or less visible

[Zanget]

How can I calculate the distance between two variables and depending on the distance of this my object is more visible or less visible.
I create a variable and assign it a value

number_one = 5;
number_two = 0;

What I want to do is that depending on the distance of these two variables affect the image_alpha of my object, I want my object to become more visible while number_two is closer to number_one otherwise my object will be less visible. I do not know if I made myself understand correctly, how can I achieve this?

 

[jo-thijs]

How can I calculate the distance between two variables and depending on the distance of this my object is more visible or less visible.
I create a variable and assign it a value

number_one = 5;
number_two = 0;

What I want to do is that depending on the distance of these two variables affect the image_alpha of my object, I want my object to become more visible while number_two is closer to number_one otherwise my object will be less visible. I do not know if I made myself understand correctly, how can I achieve this?

So you want this:

image_alpha = f(abs(number_one - number_two));

with f a function from positive real numbers to real numbers in the range [0,1]?

Like this:

image_alpha = alpha / ( abs(number_one - number_two) + alpha );

for alpha some strictly positive real number that smooths visibility degration as it grows?

 

[Zanget]

So you want this:

image_alpha = f(abs(number_one - number_two));

with f a function from positive real numbers to real numbers in the range [0,1]?

Like this:

image_alpha = alpha / ( abs(number_one - number_two) + alpha );

for alpha some strictly positive real number that smooths visibility degration as it grows?

jo-thijs Excellent works correctly!!

image_alpha = alpha / (abs (number_one - number_two) + alpha);

Now I have another question, how can I do the opposite effect? that the closer this number_one of number_two the object is more visible, otherwise it will be less visible, excuse me I'm still a noob in game maker

 

[jo-thijs]

jo-thijs Excellent works correctly!!

image_alpha = alpha / (abs (number_one - number_two) + alpha);

Now I have another question, how can I do the opposite effect? that the closer this number_one of number_two the object is more visible, otherwise it will be less visible, excuse me I'm still a noob in game maker

That function already does that.
But if you want the reverse effect, just add a 1-:

image_alpha = 1 - alpha / ( abs(number_one - number_two) + alpha );

 

[Zanget]

That function already does that.
But if you want the reverse effect, just add a 1-:

image_alpha = 1 - alpha / ( abs(number_one - number_two) + alpha );

Thank you that was just what I was looking for!!