CODEWITHSUNDEEP
javascriptvariablesmousedown
Demian Väth
Demian Väth

Reputation: 1

set a variable to a negative value on mousedown

in my code right now i've got a lot of strings and dots which are getting pulled to the position of my cursor but what im trying to do right now is that when i do a mouseclick that the variable changes to a negative value so the strings and dots are getting pushed away. Im new to JS and i simply dont know how to Code that.

var c = 1000;
canvas.addEventListener('mousedown', back);
physics.makeAttraction(mouseParticle, myCurrentParticle, c, 100);
function back(){}

i dont know if thats enough code for you guys if theres more needed pls tell me.

Upvotes: 0

Views: 95

Answers (2)

obscure
obscure

Reputation: 12891

You yould utilize the Math.sign() method to check if the value of c is positive or negative and act accordingly.

function back() {
  if (Math.sign(c) > 0) {
    c = -1000;
  } else {
    c = 1000;
  }
}

Upvotes: 0

Mark
Mark

Reputation: 92450

You can multiply your value by -1 in the function to swap the sign. 

var c = 1000;

let d = document.getElementById('num')
num.innerText = c

function back() {
  c *= -1
  num.innerText = c
}
<span id="num"></span>
<button onclick="back()">reverse</button>

Upvotes: 1

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