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添加测试shader，抽象线路绘制功能

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This commit is contained in:
lrss3
2026-02-24 16:54:49 +08:00
parent 6300085854
commit b452ba073d
8 changed files with 422 additions and 81 deletions
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Runtime/Sample.unity
+36 -26
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Runtime/UILineRender.mat
+41
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Runtime/UILineRender.shader
+166
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Shader "UILineRender"
{
Properties
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LOD 0
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Ref [_Stencil]
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Comp [_StencilComp]
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Cull Off
Lighting Off
ZWrite Off
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CGPROGRAM
#define ASE_VERSION 19901
#pragma vertex vert
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#pragma multi_compile_local _ UNITY_UI_ALPHACLIP
#define ASE_NEEDS_TEXTURE_COORDINATES0
#define ASE_NEEDS_FRAG_TEXTURE_COORDINATES0
struct appdata_t
{
float4 vertex : POSITION;
float4 color : COLOR;
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UNITY_VERTEX_INPUT_INSTANCE_ID
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{
float4 vertex : SV_POSITION;
fixed4 color : COLOR;
float2 texcoord : TEXCOORD0;
float4 worldPosition : TEXCOORD1;
float4 mask : TEXCOORD2;
UNITY_VERTEX_OUTPUT_STEREO
};
sampler2D _MainTex;
fixed4 _Color;
fixed4 _TextureSampleAdd;
float4 _ClipRect;
float4 _MainTex_ST;
float _UIMaskSoftnessX;
float _UIMaskSoftnessY;
v2f vert(appdata_t v )
{
v2f OUT;
UNITY_SETUP_INSTANCE_ID(v);
UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(OUT);
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OUT.worldPosition = v.vertex;
OUT.vertex = vPosition;
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pixelSize /= float2(1, 1) * abs(mul((float2x2)UNITY_MATRIX_P, _ScreenParams.xy));
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float2 maskUV = (v.vertex.xy - clampedRect.xy) / (clampedRect.zw - clampedRect.xy);
OUT.texcoord = v.texcoord;
OUT.mask = float4(v.vertex.xy * 2 - clampedRect.xy - clampedRect.zw, 0.25 / (0.25 * half2(_UIMaskSoftnessX, _UIMaskSoftnessY) + abs(pixelSize.xy)));
OUT.color = v.color * _Color;
return OUT;
}
fixed4 frag(v2f IN ) : SV_Target
{
//Round up the alpha color coming from the interpolator (to 1.0/256.0 steps)
//The incoming alpha could have numerical instability, which makes it very sensible to
//HDR color transparency blend, when it blends with the world's texture.
const half alphaPrecision = half(0xff);
const half invAlphaPrecision = half(1.0/alphaPrecision);
IN.color.a = round(IN.color.a * alphaPrecision)*invAlphaPrecision;
float2 texCoord1 = IN.texcoord.xy * float2( 1,1 ) + float2( 0,0 );
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half4 color = appendResult3;
#ifdef UNITY_UI_CLIP_RECT
half2 m = saturate((_ClipRect.zw - _ClipRect.xy - abs(IN.mask.xy)) * IN.mask.zw);
color.a *= m.x * m.y;
#endif
#ifdef UNITY_UI_ALPHACLIP
clip (color.a - 0.001);
#endif
color.rgb *= color.a;
return color;
}
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Runtime/UILineRender.shader.meta
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Runtime/UILineRenderer.cs
+41 -55
View File
@@ -3,35 +3,69 @@ using UnityEngine.UI;
namespace XericLibrary
{
/// <summary>
/// UILineRenderer 是一个用于在 UI 上绘制连续线条的组件
/// 支持设置线条厚度、居中显示，并为线段之间添加斜角边缘
/// 继承自 MaskableGraphic，可与 UI 遮罩系统配合使用
/// </summary>
[RequireComponent(typeof(CanvasRenderer))]
public class UILineRenderer : MaskableGraphic
{
/// <summary>
/// 线条的顶点数组，至少需要 2 个点才能绘制线条
/// 点的坐标基于本地空间，中心点由 center 属性控制
/// </summary>
public Vector2[] points;
/// <summary>
/// 线条的厚度，单位为像素
/// </summary>
public float thickness = 10f;
/// <summary>
/// 是否将线条居中显示
/// true: 线条将以组件中心为原点
/// false: 线条将以组件左下角为原点
/// </summary>
public bool center = true;
/// <summary>
/// 重写 MaskableGraphic 的方法，用于生成线条的网格
/// 当 UI 需要重建时会自动调用此方法
/// </summary>
/// <param name="vh">用于构建网格的 VertexHelper 对象</param>
protected override void OnPopulateMesh(VertexHelper vh)
{
// 清空现有的网格数据
vh.Clear();
// 至少需要 2 个点才能绘制线条
if (points.Length < 2)
return;
// 计算线路总长度
float totalLength = UILineRendererUtils.CalculateTotalLength(points);
float currentLength = 0f;
// 遍历所有点，创建线段并添加到网格中
for (int i = 0; i < points.Length-1; i++)
{
// Create a line segment between the next two points
CreateLineSegment(points[i], points[i+1], vh);
// 使用静态工具方法创建当前点与下一个点之间的线段
// 传递当前累积长度和总长度用于UV坐标计算
UILineRendererUtils.CreateLineSegment(points[i], points[i+1], thickness, center, rectTransform.sizeDelta, color, vh, currentLength, totalLength);
// 更新累积长度
currentLength += Vector2.Distance(points[i], points[i+1]);
// 计算当前线段的顶点索引（每个线段包含 5 个顶点）
int index = i * 5;
// Add the line segment to the triangles array
// 添加线段的两个三角形（构成矩形线段）
vh.AddTriangle(index, index+1, index+3);
vh.AddTriangle(index+3, index+2, index);
// These two triangles create the beveled edges
// between line segments using the end point of
// the last line segment and the start points of this one
// 为线段之间添加斜角边缘
// 使用上一个线段的终点和当前线段的起点创建过渡三角形
if (i != 0)
{
vh.AddTriangle(index, index-1, index-3);
@@ -39,53 +73,5 @@ namespace XericLibrary
}
}
}
/// <summary>
/// Creates a rect from two points that acts as a line segment
/// </summary>
/// <param name="point1">The starting point of the segment</param>
/// <param name="point2">The endint point of the segment</param>
/// <param name="vh">The vertex helper that the segment is added to</param>
private void CreateLineSegment(Vector3 point1, Vector3 point2, VertexHelper vh)
{
Vector3 offset = center ? (rectTransform.sizeDelta / 2) : Vector2.zero;
// Create vertex template
UIVertex vertex = UIVertex.simpleVert;
vertex.color = color;
// Create the start of the segment
Quaternion point1Rotation = Quaternion.Euler(0, 0, RotatePointTowards(point1, point2) + 90);
vertex.position = point1Rotation * new Vector3(-thickness / 2, 0);
vertex.position += point1 - offset;
vh.AddVert(vertex);
vertex.position = point1Rotation * new Vector3(thickness / 2, 0);
vertex.position += point1 - offset;
vh.AddVert(vertex);
// Create the end of the segment
Quaternion point2Rotation = Quaternion.Euler(0, 0, RotatePointTowards(point2, point1) - 90);
vertex.position = point2Rotation * new Vector3(-thickness / 2, 0);
vertex.position += point2 - offset;
vh.AddVert(vertex);
vertex.position = point2Rotation * new Vector3(thickness / 2, 0);
vertex.position += point2 - offset;
vh.AddVert(vertex);
// Also add the end point
vertex.position = point2 - offset;
vh.AddVert(vertex);
}
/// <summary>
/// Gets the angle that a vertex needs to rotate to face target vertex
/// </summary>
/// <param name="vertex">The vertex being rotated</param>
/// <param name="target">The vertex to rotate towards</param>
/// <returns>The angle required to rotate vertex towards target</returns>
private float RotatePointTowards(Vector2 vertex, Vector2 target)
{
return (float)(Mathf.Atan2(target.y - vertex.y, target.x - vertex.x) * (180 / Mathf.PI));
}
}
}
}
Runtime/UILineRendererUtils.cs
+110
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@@ -0,0 +1,110 @@
using UnityEngine;
using UnityEngine.UI;
namespace XericLibrary
{
/// <summary>
/// UILineRenderer 的工具类，提供静态方法用于线条渲染相关的操作
/// </summary>
public static class UILineRendererUtils
{
/// <summary>
/// 计算线路的总长度
/// </summary>
/// <param name="points">线路的顶点数组</param>
/// <returns>线路的总长度</returns>
public static float CalculateTotalLength(Vector2[] points)
{
if (points.Length < 2)
return 0f;
float totalLength = 0f;
for (int i = 0; i < points.Length - 1; i++)
{
totalLength += Vector2.Distance(points[i], points[i + 1]);
}
return totalLength;
}
/// <summary>
/// 创建线段的顶点数据
/// 每个线段由 5 个顶点组成：
/// - 起点的左右两个顶点
/// - 终点的左右两个顶点
/// - 终点的中心点（用于线段连接）
/// </summary>
/// <param name="point1">线段的起点</param>
/// <param name="point2">线段的终点</param>
/// <param name="thickness">线条的厚度</param>
/// <param name="center">是否居中显示</param>
/// <param name="rectSize">矩形变换的尺寸</param>
/// <param name="color">线条的颜色</param>
/// <param name="vh">用于添加顶点的 VertexHelper 对象</param>
/// <param name="currentLength">当前线段起点在线路中的累积长度</param>
/// <param name="totalLength">线路的总长度</param>
public static void CreateLineSegment(Vector3 point1, Vector3 point2, float thickness, bool center, Vector2 rectSize, Color color, VertexHelper vh, float currentLength, float totalLength)
{
// 计算偏移量：如果需要居中显示，则偏移到组件中心
Vector3 offset = center ? (rectSize / 2) : Vector2.zero;
// 创建顶点模板，设置颜色为组件的当前颜色
UIVertex vertex = UIVertex.simpleVert;
vertex.color = color;
// 计算线段长度
float segmentLength = Vector2.Distance(point1, point2);
// 计算起点和终点的UV坐标Y值
float startUVY = totalLength > 0 ? currentLength / totalLength : 0f;
float endUVY = totalLength > 0 ? (currentLength + segmentLength) / totalLength : 0f;
// 计算起点的旋转角度，使线条垂直于线段方向
Quaternion point1Rotation = Quaternion.Euler(0, 0, RotatePointTowards(point1, point2) + 90);
// 添加起点的左侧顶点
vertex.position = point1Rotation * new Vector3(-thickness / 2, 0);
vertex.position += point1 - offset;
vertex.uv0 = new Vector2(0f, startUVY); // 左侧顶点的UV
vh.AddVert(vertex);
// 添加起点的右侧顶点
vertex.position = point1Rotation * new Vector3(thickness / 2, 0);
vertex.position += point1 - offset;
vertex.uv0 = new Vector2(1f, startUVY); // 右侧顶点的UV
vh.AddVert(vertex);
// 计算终点的旋转角度，使线条垂直于线段方向
Quaternion point2Rotation = Quaternion.Euler(0, 0, RotatePointTowards(point2, point1) - 90);
// 添加终点的左侧顶点
vertex.position = point2Rotation * new Vector3(-thickness / 2, 0);
vertex.position += point2 - offset;
vertex.uv0 = new Vector2(0f, endUVY); // 左侧顶点的UV
vh.AddVert(vertex);
// 添加终点的右侧顶点
vertex.position = point2Rotation * new Vector3(thickness / 2, 0);
vertex.position += point2 - offset;
vertex.uv0 = new Vector2(1f, endUVY); // 右侧顶点的UV
vh.AddVert(vertex);
// 添加终点的中心点，用于连接后续线段
vertex.position = point2 - offset;
vertex.uv0 = new Vector2(0.5f, endUVY); // 中心点的UV
vh.AddVert(vertex);
}
/// <summary>
/// 计算一个点指向另一个点的角度（以度为单位）
/// </summary>
/// <param name="vertex">起始点</param>
/// <param name="target">目标点</param>
/// <returns>旋转角度，范围为 -180 到 180 度</returns>
public static float RotatePointTowards(Vector2 vertex, Vector2 target)
{
// 使用反正切函数计算两点之间的角度
// 将弧度转换为角度返回
return (float)(Mathf.Atan2(target.y - vertex.y, target.x - vertex.x) * (180 / Mathf.PI));
}
}
}
Runtime/UILineRendererUtils.cs.meta
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