D3.js time.interpolate() Function

Last Updated : 23 Aug, 2020

The time.interpolate() function in D3.js is used to change the scale's range interpolator factory. It returns the current interpolator if the factory is not specified.

Syntax:

time.interpolate( interpolate )

Parameters: This function accepts a single parameter as mentioned above and described below:

interpolate: This parameter takes the interpolator function.

Below programs illustrate the time.interpolate() function in D3.js:

Example 1:

HTML

<!DOCTYPE html> <html> <head> <script src="https://d3js.org/d3.v4.min.js">  </script> <script src="https://d3js.org/d3-color.v1.min.js">  </script> <script src= "https://d3js.org/d3-interpolate.v1.min.js">  </script> <script src= "https://d3js.org/d3-scale-chromatic.v1.min.js">  </script> </head> <body> <h1 style="color: green"> GeeksforGeeks </h1> <p>time.interpolate() Function </p> <script>  var time = d3.scaleTime()  // Setting domain and range  // for the scale  .domain([1, 10])  .range([1, 100])  // Using the specified interpolation  .interpolate(d3.interpolateRound);  document.write("<h3>time(0.5): " +  time(0.5) + "</h3>");  document.write("<h3>time(21): " +  time(21) + "</h3>");  document.write("<h3>time(5.5): " +  time(5.5) + "</h3>");  document.write("<h3>time(1.5): " +  time(1.5) + "</h3>");  </script> </body> </html>

Output:

Example 2:

HTML

<!DOCTYPE html> <html> <head> <script src="https://d3js.org/d3.v4.min.js">  </script> <script src="https://d3js.org/d3-color.v1.min.js">  </script> <script src= "https://d3js.org/d3-interpolate.v1.min.js">  </script> <script src= "https://d3js.org/d3-scale-chromatic.v1.min.js">  </script> <style>  div {  width: 200px;  height: 40px;  text-align: center;  background-color: rgb(100, 150, 200);  }  </style> </head> <body> <h1 style="color: green"> GeeksforGeeks </h1> <p>time.interpolate() Function </p> <div class="b1">time(4.5)</div> <div class="b2">time(40)</div> <div class="b3">time(11.5)</div> <div class="b4">time(99.5)</div> <script>  var time = d3.scaleTime()  // Setting domain and range  // for the scale  .domain([0, 100])  .range(["blue", "yellow", "green"])  // Using the specified interpolation  .interpolate(  d3.interpolateCubehelix.gamma(0.5)  );  var color1 = time(4.5);  var color2 = time(40);  var color3 = time(11.5);  var color4 = time(99.5);  var div1 = document.querySelector(".b1")  .style.backgroundColor = color1;  var div2 = document.querySelector(".b2")  .style.backgroundColor = color2;  var div3 = document.querySelector(".b3")  .style.backgroundColor = color3;  var div4 = document.querySelector(".b4")  .style.backgroundColor = color4;  </script> </body> </html>