The d3.rgb() function in D3.js is used to return RGB value of the specified CSS color.
Syntax:
d3.rgb(color);
Parameters: This function accepts single parameter color which is used to specify the CSS color.
Return Value: This function returns RGB value of the given CSS color.
Below programs illustrate the d3.rgb() function in D3.js:
Example 1:
<!DOCTYPE html> <html>   <head>     <title>d3.rgb() function</title>   </head>   <body>     <script>                   // Calling the d3.rgb() function function         // with some parameters         var color1 = d3.rgb("red");         var color2 = d3.rgb("green");         var color3 = d3.rgb("blue");                 // Getting the RGB values         console.log(color1);         console.log(color2);         console.log(color3);     </script> </body>   </html> |
Output:
{"r":255, "g":0, "b":0, "opacity":1}
{"r":0, "g":128, "b":0, "opacity":1}
{"r":0, "g":0, "b":255, "opacity":1}
Example 2:
<!DOCTYPE html> <html>   <head>     <title>d3.rgb() function</title>   </head>   <body>     <script>                   // Calling the d3.rgb() function function         // without any parameters         var color = d3.rgb();                 // Getting the RGB values         console.log(color);     </script> </body>   </html> |
Output:
{"r":null, "g":null, "b":null, "opacity":1}
Reference: https://devdocs.io/d3~5/d3-color#rgb
