Mathf.Cos

パラメーター

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);
	}
}