Untiy 程序生成一个扇形sprite
发表于2019-01-23
类似王者荣耀中近程职业与远程职业攻击范围是不同的，类似这种扇形的检测范围是根据什么来实现的呢？多数情况下还是需要策划同学来自行配置来控制扇形的范围。这才有了本篇要和大家分享的使用程序来成成扇形检测范围的纹理。
直接给出代码：
/// <summary>
/// Generates the sprite.
/// </summary>
/// <param name="sr">SpriteRenderer.</param>
/// <param name="size">扇形的半径.</param>
/// <param name="range">扇形的展开范围（角度）.</param>
/// <param name="sectorColor">颜色.</param>
void GenerateSprite(SpriteRenderer sr, float size, float range,Color sectorColor) ｛
float radius = size / 2;
Texture2D t = new Texture2D((int)size,(int)size);
Vector2 center = new Vector2(radius, 0);
for (int w = 0; w < size; w++)｛
for (int h = 0; h < size; h ++)｛
Color c;
Vector2 v = new Vector2(w, h) - center;
float alpha = 0f;
float angle = GameCommon.GetAngle(Vector2.zero ,v);
float dis = Vector2.Distance(v, Vector2.zero);
if(angle > 90-range/2 && angle < 90 + range / 2 &&
dis > 20)｛
float rate = dis / size;
alpha = Mathf.Min(0.8f - rate*rate*rate,1);
if( Mathf.Abs(angle - (90 - range / 2)) < 1 ||
Mathf.Abs(angle - (90 + range / 2)) < 1)｛
alpha += 0.5f;
｝
c = sectorColor * alpha * 0.8f;
｝else｛
c = new Color(0, 0, 0, 0);
｝
t.SetPixel(w,h,c);
｝
｝
t.Apply();
Sprite pic = Sprite.Create(t, new Rect(0, 0, size, size), new Vector2(0.5f, -0.2f));
sr.sprite = pic;
｝
实现效果如下：
