The d3.scaleLog() function is used to create a new continuous scale with the user-defined domain and range, the default base is 10. clamping is disabled by default in this scale.
Syntax:
d3.scaleLog([[domain, ]range])
Parameters: This function accepts two parameters as mentioned above and described below.
- domain: This parameter always accepts two or more than two numbers. Default value is [1, 10].
- range: This parameter accepts a number or a string array. It's default value is [0, 1].
Return Value: This function returns the newly created continuous scale.
Below given are a few examples of the function given above.
Example 1:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" path1tent=
"width=device-width, initial-scale=1.0" />
<script src="https://d3js.org/d3.v4.min.js">
</script>
</head>
<body>
<script>
var log = d3.scaleLog()
.domain([1, 10])
.range([10, 20, 30, 40, 50, 60]);
console.log(log(1));
console.log(log(2));
console.log(log(3));
console.log(log(4));
</script>
</body>
</html>
Output:
Example 2:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" path1tent=
"width=device-width, initial-scale=1.0" />
<script src="https://d3js.org/d3.v4.min.js">
</script>
</head>
<body>
<script>
var log = d3.scaleLog()
.domain([-1, 1])
.range([10, 20, 30, 40, 50, 60]);
// Returns NaN as Domain cant be less than one
console.log("Domain in log scale cannot"
+ " be less than one : ", log(1));
var log = d3.scaleLog()
.domain([10, 100])
.range(["red", "green", "blue", "white"]);
console.log("log(1): ", log(1));
console.log("log(1.5): ", log(1.5));
</script>
</body>
</html>
Output:
