The pow.invert() function is used to return a value from the domain when given a value from the range. This inversion is useful for interaction such as determining the data value that corresponds to the position of the mouse.
Syntax:
pow.invert( value )
Parameters: This function accepts only one parameter as given above and described below:
- value: It is a number that belongs to any value in the given range.
Return Values: This function returns a number from the domain.
The program below illustrates the pow.invert() function in D3.js:
Example 1: Taking all elements of range to be positive.
HTML
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <title>neveropen</title> <script src= </script> <script src= </script> <script src= </script> <script src= </script> </head> <body> <h2 style="color: green">neveropen</h2> <p>pow.invert() Function </p> <script> var pow = d3.scalePow() .domain([0, 1]) .range([1, 2, 3, 4, 5, 6]); document.write("<h3> pow.invert(1): " + pow.invert(1) + "</h3>"); document.write("<h3>pow.invert(2): " + pow.invert(2) + "</h3>"); document.write("<h3>pow.invert(3): " + pow.invert(3) + "</h3>"); document.write("<h3> pow(pow.invert(1)): " + pow(pow.invert(1)) + "</h3>"); document.write("<h3>pow(pow.invert(2)): " + pow(pow.invert(2)) + "</h3>"); document.write("<h3>pow(pow.invert(3)): " + pow(pow.invert(3)) + "</h3>"); </script> </body> </html> |
Output:
Example 2: Taking a range array such that it contains positive and negative numbers both.
HTML
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <title>neveropen</title> <script src= </script> <script src= </script> <script src= </script> <script src= </script> </head> <body> <h2 style="color: green">neveropen</h2> <p>pow.invert() Function </p> <script> var pow = d3.scalePow() .domain([-1, 1]) .rangeRound([10, 20, 30, 40, 50, 60]) .exponent(2); document.write("<h3> pow.invert(1): " + pow.invert(1) + "</h3>"); document.write("<h3>pow.invert(2): " + pow.invert(2) + "</h3>"); document.write("<h3>pow.invert(3): " + pow.invert(3) + "</h3>"); document.write("<h3> pow(pow.invert(-1)): " + pow(pow.invert(-1)) + "</h3>"); document.write("<h3>pow(pow.invert(-2)): " + pow(pow.invert(-2)) + "</h3>"); document.write("<h3>pow(pow.invert(-1)): " + pow(pow.invert(-3)) + "</h3>"); </script> </body> </html> |
Output:
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