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| using UnityEngine;
using UnityEngine.UI;
[ExecuteAlways]
//离线生成圆环 图片 缓存在预制体中
public class CircleSprite : MonoBehaviour
{
//空白区域色值
[Header("空白区域色值")]
public Color emptyColor = new Color(0, 0, 0, 0);
//圆环区域色值
[Header("圆环区域色值")]
public Color circleColor = Color.white;
//圆环内径/外径
[Header("圆环内径")]
public int minRadius = 40;
[Header("圆环外径[圆形尺寸]")]
public int maxRadius = 50;
//扇形角度
[Header("扇形角度")]
public float circleAngle = 90;
Color lastColor = Color.black;
Color lastCircleColor = Color.black;
int lastMinRadius = 0;
int lastMaxRadius = 0;
float lastCircleAngle = 0;
private void Update()
{
if (Application.isPlaying) return;
if (lastColor != emptyColor || lastCircleColor != circleColor || minRadius != lastMinRadius || maxRadius != lastMaxRadius || circleAngle != lastCircleAngle || circleAngle != lastCircleAngle)
{
circleAngle = Mathf.Clamp(circleAngle, 0, 361);
minRadius = minRadius > maxRadius ? maxRadius : minRadius;
lastColor = emptyColor;
lastCircleColor = circleColor;
lastMinRadius = minRadius;
lastMaxRadius = maxRadius;
lastCircleAngle = circleAngle;
var sprite = CreateSprite(minRadius, maxRadius, circleAngle / 2, circleColor);
sprite.name = "cirlce";
this.GetComponent<Image>().sprite = sprite;
}
}
/// <summary>
/// 绘制扇形圆环，生成Sprite
/// </summary>
/// <param name="minRadius">圆环内径，值为0即是实心圆</param>
/// <param name="maxRadius">圆环外径</param>
/// <param name="circleAngle">1/2扇形弧度，值>=180度即是整园</param>
Sprite CreateSprite(int minRadius, int maxRadius, float halfAngle, Color circleColor)
{
//图片尺寸
int spriteSize = maxRadius * 2;
//创建Texture2D
Texture2D texture2D = new Texture2D(spriteSize, spriteSize);
//图片中心像素点坐标
Vector2 centerPixel = new Vector2(spriteSize / 2, spriteSize / 2);
//
Vector2 tempPixel;
float tempAngle, tempDisSqr;
if (halfAngle > 0 && halfAngle < 360)
{
//遍历像素点，绘制扇形圆环
for (int x = 0; x < spriteSize; x++)
{
for (int y = 0; y < spriteSize; y++)
{
//以中心作为起点，获取像素点向量
tempPixel.x = x - centerPixel.x;
tempPixel.y = y - centerPixel.y;
//是否在半径范围内
tempDisSqr = tempPixel.sqrMagnitude;
if (tempDisSqr >= minRadius * minRadius && tempDisSqr <= maxRadius * maxRadius)
{
//是否在角度范围内
tempAngle = Vector2.Angle(Vector2.up, tempPixel);
if (tempAngle < halfAngle || tempAngle > 360 - halfAngle)
{
//设置像素色值
texture2D.SetPixel(x, y, circleColor);
continue;
}
}
//设置为透明
texture2D.SetPixel(x, y, emptyColor);
}
}
}
else
{
//遍历像素点，绘制圆环
for (int x = 0; x < spriteSize; x++)
{
for (int y = 0; y < spriteSize; y++)
{
//以中心作为起点，获取像素点向量
tempPixel.x = x - centerPixel.x;
tempPixel.y = y - centerPixel.y;
//是否在半径范围内
tempDisSqr = tempPixel.sqrMagnitude;
if (tempDisSqr >= minRadius * minRadius && tempDisSqr <= maxRadius * maxRadius)
{
//设置像素色值
texture2D.SetPixel(x, y, circleColor);
continue;
}
//设置为透明
texture2D.SetPixel(x, y, emptyColor);
}
}
}
texture2D.Apply();
//创建Sprite
return Sprite.Create(texture2D, new Rect(0, 0, spriteSize, spriteSize), new Vector2(0.5f, 0.5f));
}
}
|