User Guide

Math.tan() 361

trace(Math.SQRT2);

// Output: 1.4142135623731

Math.tan()

Availability

Flash Player 5. In Flash Player 4, the methods and properties of the Math class are emulated using

approximations and might not be as accurate as the non-emulated math functions that Flash

Player 5 supports.

Usage

Math.tan(x:Number)

Parameters

A number that represents an angle measured in radians.

Returns

A number; tangent of parameter x.

Description

Method; computes and returns the tangent of the specified angle. To calculate a radian, use the

information outlined in the introduction to the Math class.

Example

The following example draws a circle using the mathematical constant pi, the tangent of an angle,

and the Drawing API.

drawCircle(this, 100, 100, 50);

function drawCircle(mc:MovieClip, x:Number, y:Number, r:Number):Void {

mc.lineStyle(2, 0xFF0000, 100);

mc.moveTo(x+r, y);

mc.curveTo(r+x, Math.tan(Math.PI/8)*r+y, Math.sin(Math.PI/4)*r+x,

Math.sin(Math.PI/4)*r+y);

mc.curveTo(Math.tan(Math.PI/8)*r+x, r+y, x, r+y);

mc.curveTo(-Math.tan(Math.PI/8)*r+x, r+y, -Math.sin(Math.PI/4)*r+x,

Math.sin(Math.PI/4)*r+y);

mc.curveTo(-r+x, Math.tan(Math.PI/8)*r+y, -r+x, y);

mc.curveTo(-r+x, -Math.tan(Math.PI/8)*r+y, -Math.sin(Math.PI/4)*r+x, -

Math.sin(Math.PI/4)*r+y);

mc.curveTo(-Math.tan(Math.PI/8)*r+x, -r+y, x, -r+y);

mc.curveTo(Math.tan(Math.PI/8)*r+x, -r+y, Math.sin(Math.PI/4)*r+x, -

Math.sin(Math.PI/4)*r+y);

mc.curveTo(r+x, -Math.tan(Math.PI/8)*r+y, r+x, y);

}