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CSS Function - atan2()
The CSS function atan2() is a trigonometric operation that computes the inverse tangent of two values in the range of -infinity and infinity.
This function takes two arguments and returns the number of radians representing an <angle> between -180° and 180°.
Possible values
The function atan2(y, x) takes two values separated by a comma as parameters. Each value can be a <number>, a <dimension>, or a <percentage>.
Both values must be of the same type, but if they are <dimension>, they can also have different units.
y-coordinate - The y-coordinate of the point. A calculation that results in a <number>, a <dimension>, or a <percentage>.
x-coordinate - The x-coordinate of the point. A calculation that results in a <number>, a <dimension>, or a <percentage>.
Return value
The atan2(y, x) function takes two given values, x and y, and uses them to compute and return the <angle> between the positive x-axis and the line from the origin to the coordinate point (x, y).
Syntax
atan2( <calc-sum>, <calc-sum> )
CSS atan2() - Rotate Element
The atan2() function can be utilized to rotate elements as it produces an <angle>. The following example demonstrates the usage of atan2() to rotate boxes
<html> <head> <style> div.box { width: 100px; height: 100px; background: skyblue; font-size:25px; } div.boxA { transform: rotate(atan2(2, 4)); margin-left: 20px; margin-bottom:30px; } div.boxB { transform: rotate(atan2(4%, -5%)); margin-left: 20px; margin-bottom: 40px; } div.boxC { transform: rotate(atan2(-2, 1.5)); margin-left: 20px; margin-bottom: 35px; } div.boxD { transform: rotate(atan2(2, 3.5)); margin-left: 20px; margin-bottom: 30px; } </style> </head> <body> <div class="box boxA">A</div> <div class="box boxB">B</div> <div class="box boxC">C</div> <div class="box boxD">D</div> </body> </html>
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