雨松MOMO关于UGUI多边形

项目中可能有些icon.有的地方显示矩形，有的地方又要显示圆形。

网上我看有人用shader实现了，我觉得使用起来不太方便。后来参考了一个工程 https://bitbucket.org/ddreaper/unity-ui-extensions

 

把sprite或者texture拽上去。在这里设置多边形的数量，我测试36就已经很圆了。。

然后就是代码

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usingSystem; usingUnityEngine; usingUnityEngine.UI;   publicclassUICircle:RawImage { constintFILL_PERCENT=100; floatthickness=5;   [SerializeField][Range(4,360)] int_segments=36;   publicintsegments{ get{return_segments;} set{ if(_segments!=value){ _segments=value; SetVerticesDirty(); #if UNITY_EDITOR UnityEditor.EditorUtility.SetDirty(transform); #endif } } }     protectedoverridevoidOnRectTransformDimensionsChange() { base.OnRectTransformDimensionsChange(); this.thickness=(float)Mathf.Clamp(this.thickness,0,rectTransform.rect.width/2); }      protectedoverridevoidOnPopulateMesh(VertexHelpervh)     {         floatouter=-rectTransform.pivot.x *rectTransform.rect.width;         floatinner=-rectTransform.pivot.x *rectTransform.rect.width+this.thickness;           vh.Clear();           Vector2prevX=Vector2.zero;         Vector2prevY=Vector2.zero;         Vector2uv0=newVector2(0,0);         Vector2uv1=newVector2(0,1);         Vector2uv2=newVector2(1,1);         Vector2uv3=newVector2(1,0);         Vector2pos0;         Vector2pos1;         Vector2pos2;         Vector2pos3;           floattw=rectTransform.rect.width;         floatth=rectTransform.rect.height;           floatangleByStep=(FILL_PERCENT/100f*(Mathf.PI *2f))/segments;         floatcurrentAngle=0f;         for(inti=0;i<segments+1;i++)         {               floatc=Mathf.Cos(currentAngle);             floats=Mathf.Sin(currentAngle);               StepThroughPointsAndFill(outer,inner,refprevX,refprevY,outpos0,outpos1,outpos2,outpos3,c,s);               uv0=newVector2(pos0.x/tw+0.5f,pos0.y/th+0.5f);             uv1=newVector2(pos1.x/tw+0.5f,pos1.y/th+0.5f);             uv2=newVector2(pos2.x/tw+0.5f,pos2.y/th+0.5f);             uv3=newVector2(pos3.x/tw+0.5f,pos3.y/th+0.5f);               vh.AddUIVertexQuad(SetVbo(new[]{pos0,pos1,pos2,pos3},new[]{uv0,uv1,uv2,uv3}));               currentAngle+=angleByStep;         }     }       privatevoidStepThroughPointsAndFill(floatouter,floatinner,refVector2prevX,refVector2prevY,outVector2pos0,outVector2pos1,outVector2pos2,outVector2pos3,floatc,floats)     {         pos0=prevX;         pos1=newVector2(outer *c,outer *s);           pos2=Vector2.zero;         pos3=Vector2.zero;           prevX=pos1;         prevY=pos2;     }   protectedUIVertex[]SetVbo(Vector2[]vertices,Vector2[]uvs) { UIVertex[]vbo=newUIVertex[4]; for(inti=0;i<vertices.Length;i++) { varvert=UIVertex.simpleVert; vert.color=color; vert.position=vertices[i]; vert.uv0=uvs[i]; vbo[i]=vert; } returnvbo; } }

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usingSystem.Collections; usingSystem.Collections.Generic; usingUnityEngine; usingUnityEditor; usingUnityEditor.UI;   [CustomEditor(typeof(UICircle),true)] [CanEditMultipleObjects] publicclassUICircleInspector:RawImageEditor{   publicoverridevoidOnInspectorGUI() { base.OnInspectorGUI(); UICirclecircle=targetasUICircle; circle.segments=Mathf.Clamp(EditorGUILayout.IntField("UICircle多边形",circle.segments),4,360);   }   }

OK，因为继承的是RawImage所以缺点就是没办法合并批次了。（因为我们项目icon比较多，不想把图集撑得很大，而带来内存的问题，所以暂时没考虑合并批次的问题）

【其中第二个脚本是一个编辑器类，它必须放在unity的Editor目录下才能生效】

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