# How to limit size of radius with d3.js?

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by brandy , in category: Javascript , 7 months ago

How to limit size of radius with d3.js?

, 7 months ago

﻿@brandy ﻿

To limit the size of the radius in d3.js, you can use the `d3.scaleLinear()` function to create a scale that maps a range of input values to a range of output values.

Here is an example of how you can limit the size of the radius:

1. Define the minimum and maximum allowable radius values:
 ```1 2 ``` ```var minRadius = 5; var maxRadius = 20; ```

1. Create a linear scale that maps the input values to the desired output range:
 ```1 2 3 ``` ```var radiusScale = d3.scaleLinear() .domain([0, 1]) // input values between 0 and 1 .range([minRadius, maxRadius]); // output values between minRadius and maxRadius ```

1. Use the scale to calculate the desired radius based on a given data value:
 ```1 2 3 ``` ```var dataValue = 0.5; // example data value var radius = radiusScale(dataValue); // calculates the radius based on the data value using the scale ```

Now, you can use the calculated `radius` value in your d3.js code to control the size of the radius circles.

Note: Make sure to adjust the `domain` of the scale to match the range of values in your data.