User Guide

Math 761

tan (Math.tan method)

public static tan(x:Number) : Number

Computes and returns the tangent of the specified angle. To calculate a radian, use the

information outlined in the introduction to the Math class.

Availability: ActionScript 1.0; 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.

Parameters

x:Number - A number that represents an angle measured in radians.

Returns

Number - A number; tangent of parameter x.

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);

}