Version: 2017.1

# Mathf.Cos

マニュアルに切り替える
public static float Cos (float f);

## 説明

ラジアンで表された角度 `f` のコサイン (余弦) を返します。

```using UnityEngine;
using System.Collections;
public class PolyDrawExample : MonoBehaviour
{
public int numberOfSides;
public float polygonRadius;
public Vector2 polygonCenter;
void Update()
{
DebugDrawPolygon(polygonCenter, polygonRadius, numberOfSides);
}    // Draw a polygon in the XY plane with a specfied position, number of sides
// and radius.
void DebugDrawPolygon(Vector2 center, float radius, int numSides)
{
// The corner that is used to start the polygon (parallel to the X axis).
Vector2 startCorner = new Vector2(radius, 0) + polygonCenter;        // The "previous" corner point, initialised to the starting corner.
Vector2 previousCorner = startCorner;        // For each corner after the starting corner...
for (int i = 1; i < numSides; i++)
{
// Calculate the angle of the corner in radians.
float cornerAngle = 2f * Mathf.PI / (float)numSides * i;            // Get the X and Y coordinates of the corner point.
Vector2 currentCorner = new Vector2(Mathf.Cos(cornerAngle) * radius, Mathf.Sin(cornerAngle) * radius) + polygonCenter;            // Draw a side of the polygon by connecting the current corner to the previous one.
Debug.DrawLine(currentCorner, previousCorner);            // Having used the current corner, it now becomes the previous corner.
previousCorner = currentCorner;
}        // Draw the final side by connecting the last corner to the starting corner.
Debug.DrawLine(startCorner, previousCorner);
}
}
```