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146 行
4.4 KiB
146 行
4.4 KiB
using System.Collections.Generic;
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using UnityEngine;
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using UnityEngine.UI;
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[AddComponentMenu("UI/Effects/TextSpacing")]
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public class TextSpacing : BaseMeshEffect
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{
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#region Struct
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public enum HorizontalAligmentType
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{
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Left,
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Center,
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Right
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}
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public class Line
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{
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// 起点索引
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public int StartVertexIndex { get { return _startVertexIndex; } }
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private int _startVertexIndex = 0;
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// 终点索引
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public int EndVertexIndex { get { return _endVertexIndex; } }
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private int _endVertexIndex = 0;
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// 该行占的点数目
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public int VertexCount { get { return _vertexCount; } }
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private int _vertexCount = 0;
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public Line(int startVertexIndex, int length)
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{
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_startVertexIndex = startVertexIndex;
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_endVertexIndex = length * 6 - 1 + startVertexIndex;
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_vertexCount = length * 6;
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}
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}
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#endregion
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public float Spacing = 1f;
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public override void ModifyMesh(VertexHelper vh)
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{
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if (!IsActive() || vh.currentVertCount == 0)
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{
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return;
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}
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var text = GetComponent<Text>();
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if (text == null)
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{
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Debug.LogError("Missing Text component");
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return;
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}
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// 水平对齐方式
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HorizontalAligmentType alignment;
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if (text.alignment == TextAnchor.LowerLeft || text.alignment == TextAnchor.MiddleLeft || text.alignment == TextAnchor.UpperLeft)
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{
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alignment = HorizontalAligmentType.Left;
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}
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else if (text.alignment == TextAnchor.LowerCenter || text.alignment == TextAnchor.MiddleCenter || text.alignment == TextAnchor.UpperCenter)
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{
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alignment = HorizontalAligmentType.Center;
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}
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else
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{
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alignment = HorizontalAligmentType.Right;
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}
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var vertexs = new List<UIVertex>();
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vh.GetUIVertexStream(vertexs);
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// var indexCount = vh.currentIndexCount;
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var lineTexts = text.text.Split('\n');
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var lines = new Line[lineTexts.Length];
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// 根据lines数组中各个元素的长度计算每一行中第一个点的索引，每个字、字母、空母均占6个点
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for (var i = 0; i < lines.Length; i++)
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{
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// 除最后一行外，vertexs对于前面几行都有回车符占了6个点
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if (i == 0)
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{
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lines[i] = new Line(0, lineTexts[i].Length + 1);
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}
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else if (i > 0 && i < lines.Length - 1)
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{
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lines[i] = new Line(lines[i - 1].EndVertexIndex + 1, lineTexts[i].Length + 1);
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}
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else
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{
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lines[i] = new Line(lines[i - 1].EndVertexIndex + 1, lineTexts[i].Length);
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}
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}
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UIVertex vt;
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for (var i = 0; i < lines.Length; i++)
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{
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for (var j = lines[i].StartVertexIndex; j <= lines[i].EndVertexIndex; j++)
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{
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if (j < 0 || j >= vertexs.Count)
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{
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continue;
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}
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vt = vertexs[j];
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var charCount = lines[i].EndVertexIndex - lines[i].StartVertexIndex;
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if (i == lines.Length - 1)
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{
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charCount += 6;
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}
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if (alignment == HorizontalAligmentType.Left)
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{
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vt.position += new Vector3(Spacing * ((j - lines[i].StartVertexIndex) / 6), 0, 0);
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}
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else if (alignment == HorizontalAligmentType.Right)
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{
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vt.position += new Vector3(Spacing * (-(charCount - j + lines[i].StartVertexIndex) / 6 + 1), 0, 0);
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}
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else if (alignment == HorizontalAligmentType.Center)
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{
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var offset = (charCount / 6) % 2 == 0 ? 0.5f : 0f;
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vt.position += new Vector3(Spacing * ((j - lines[i].StartVertexIndex) / 6 - charCount / 12 + offset), 0, 0);
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}
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vertexs[j] = vt;
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// 以下注意点与索引的对应关系
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if (j % 6 <= 2)
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{
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vh.SetUIVertex(vt, (j / 6) * 4 + j % 6);
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}
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if (j % 6 == 4)
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{
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vh.SetUIVertex(vt, (j / 6) * 4 + j % 6 - 1);
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}
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}
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}
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}
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}
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