ngungo ngungo - 23 days ago 8
Javascript Question

Invert scale function

This is interesting to me. Look at the following D3 code:

var scale = d3.scale.linear()
.domain([100, 500])
.range([10, 350]);

scale(100); //Returns 10
scale(300); //Returns 180
scale(500); //Returns 350


Is there a function that inverse of scale? For example,

inverseScale(10); //Returns 100
inverseScale(180); //Returns 300
inverseScale(350); //Returns 500

Answer

Yes, there is, and it's aptly named invert.

console.log(scale.invert(10));   //Returns 100
console.log(scale.invert(180));  //Returns 300
console.log(scale.invert(350));  //Returns 500