前言
由于项目限制，只能用SpriteRender来实现环形进度条的效果。所以只能另想他法
代码
Shader "My/SpriteCircleFill"
{
Properties
{
[PerRendererData] _MainTex("Sprite Texture", 2D) = "white" {
}
_Color("Tint", Color) = (1,1,1,1)
[MaterialToggle] PixelSnap("Pixel snap", Float) = 0
_Fill("Fill",Range(0,1)) = 0
}
SubShader
{
Tags
{
"Queue" = "Transparent"
"IgnoreProjector" = "True"
"RenderType" = "Transparent"
"PreviewType" = "Plane"
"CanUseSpriteAtlas" = "True"
}
Cull Off
Lighting Off
ZWrite Off
Fog {
Mode Off}
Blend SrcAlpha OneMinusSrcAlpha
Pass{
CGPROGRAM
#pragma vertex vert
#pragma fragment frag
#pragma multi_compile DUMMY PIXELSNAP_ON
#include "UnitySprites.cginc"
float _Fill;
v2f vert(appdata_t IN)
{
v2f OUT;
OUT.vertex = UnityObjectToClipPos(IN.vertex);
OUT.texcoord = IN.texcoord;
OUT.color = IN.color*_Color;
#ifdef PIXELSNAP_ON
OUT.vertex = UnityPixelSnap(OUT.vertex);
#endif
return OUT;
}
fixed4 frag(v2f IN) :COLOR
{
fixed4 result = tex2D(_MainTex,IN.texcoord)*IN.color;
fixed2 p = fixed2(IN.texcoord.x - 0.5,IN.texcoord.y - 0.5);
if (_Fill < 0.5)
{
float compare = (_Fill * 2 - 0.5)*3.1415926;
float theta = atan(p.y / p.x);
if (theta > compare)
{
result.a = 0;
}
if (p.x > 0)
{
result.a = 0;
}
}
else
{
float compare = ((_Fill - 0.5) * 2 - 0.5)*3.1415926;
float theta = atan(p.y / p.x);
if (p.x > 0)
{
if (theta > compare)
{
result.a = 0;
}
}
}
return result;
}
ENDCG
}
}
Fallback "Transparent/VertexLit"
}
使用方法
1.创建上面代码中的Shader
2.create – Material —将默认的Shader替换成上面的shader
3.将这个Material赋值给要使用这个shader进度条的SpriteRenderer
4.程序里取到这个spriteRender：
SpriteRenderer sp_render;
sp_render.material.SetFloat(“_Fill”, (float)进度条的值); //此处注意需要设置的变量名称