144 lines
4.8 KiB
GLSL
144 lines
4.8 KiB
GLSL
// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'
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Shader "Unlit/polygon"
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{
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Properties
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{
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//定义基本属性，可以从编辑器里面进行设置的变量
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// _MainTex ("Texture", 2D) = "white" {}
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}
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CGINCLUDE
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//从应用程序传入顶点函数的数据结构定义
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struct appdata
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{
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float4 vertex : POSITION;
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float2 uv : TEXCOORD0;
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};
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//从顶点函数传入片段函数的数据结构定义
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struct v2f
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{
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float2 uv : TEXCOORD0;
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float4 vertex : SV_POSITION;
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};
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//定义贴图变量
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sampler2D _MainTex;
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// float4 _MainTex_ST;
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//定义与脚本进行通信的变量
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vector Value[99];
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int PointNum =0;
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//计算两点间的距离的函数
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float Dis(float4 v1,float4 v2)
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{
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return sqrt(pow((v1.x-v2.x),2)+pow((v1.y-v2.y),2));
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}
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//绘制线段
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bool DrawLineSegment(float4 p1, float4 p2, float lineWidth,v2f i)
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{
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float4 center = float4((p1.x+p2.x)/2,(p1.y+p2.y)/2,0,0);
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//计算点到直线的距离
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float d = abs((p2.y-p1.y)*i.vertex.x + (p1.x - p2.x)*i.vertex.y +p2.x*p1.y -p2.y*p1.x )/sqrt(pow(p2.y-p1.y,2) + pow(p1.x-p2.x,2));
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//小于或者等于线宽的一半时，属于直线范围
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float lineLength = sqrt(pow(p1.x-p2.x,2)+pow(p1.y-p2.y,2));
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if(d<=lineWidth/2 && Dis(i.vertex,center)<lineLength/2)
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{
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return true;
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}
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return false;
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}
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//绘制多边形，这里限制了顶点数不超过6。可以自己根据需要更改。
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bool pnpoly(int nvert, float4 vert[99], float testx, float testy)
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{
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int i, j;
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bool c=false;
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float vertx[99];
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float verty[99];
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for(int n=0;n<nvert;n++)
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{
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vertx[n] = vert[n].x;
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verty[n] = vert[n].y;
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}
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for (i = 0, j = nvert-1; i < nvert; j = i++) {
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if ( ((verty[i]>testy) != (verty[j]>testy)) && (testx < (vertx[j]-vertx[i]) * (testy-verty[i]) / (verty[j]-verty[i]) + vertx[i]) )
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c = !c;
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}
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return c;
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}
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v2f vert (appdata v)
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{
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v2f o;
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//将物体顶点从模型空间换到摄像机剪裁空间，也可采用简写方式——o.vertex = UnityObjectToClipPos(v.vertex);
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/*o.vertex = UnityObjectToClipPos(v.vertex); */
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o.vertex = v.vertex;
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//2D UV坐标变换,也可以采用简写方式——o.uv = TRANSFORM_TEX(v.uv, _MainTex);
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//o.uv = v.uv.xy * _MainTex_ST.xy + _MainTex_ST.zw;
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return o;
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}
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fixed4 frag (v2f i) : SV_Target
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{
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//绘制多边形顶点
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//for(int j=0;j<PointNum;j++)
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//{
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// if(Dis(i.vertex, Value[j])<3)
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// {
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// return fixed4(1,0,0,0.5);
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// }
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//}
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////绘制多边形的边
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//for(int k=0;k<PointNum;k++)
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//{
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// if(k==PointNum-1)
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// {
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// if(DrawLineSegment(Value[k],Value[0],2,i))
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// {
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// return fixed4(1,1,0,0.5);
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// }
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// }
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// else
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// {
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// if(DrawLineSegment(Value[k],Value[k+1],2,i))
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// {
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// return fixed4(1,1,0,0.5);
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// }
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// }
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//}
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//填充多边形内部
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if(pnpoly(PointNum, Value,i.vertex.x ,i.vertex.y))
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{
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return fixed4(0,1,0,0.3);
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}
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return fixed4(0,0,0,0);
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//fixed4 col = tex2D(_MainTex, i.uv);
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//return col;
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}
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ENDCG
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SubShader
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{
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Tags { "RenderType"="Opaque" }
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LOD 100
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Pass
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{
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//选取Alpha混合方式
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Blend SrcAlpha OneMinusSrcAlpha
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//在CGPROGRAM代码块中写自己的处理过程
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CGPROGRAM
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//定义顶点函数和片段函数的入口分别为vert和frag
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#pragma vertex vert
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#pragma fragment frag
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//包含基本的文件，里面有一些宏定义和基本函数
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#include "UnityCG.cginc"
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ENDCG
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}
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}
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} |