技術標籤：unity3dc#

弧形Text元件

// A code block
var foo = 'bar';

// An highlighted block
using System;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
public class DotModel
{
    public UIVertex lb = new UIVertex();
    public
 
 UIVertex lt = new UIVertex();
    public UIVertex rt = new UIVertex();
    public UIVertex rb = new UIVertex();
}
[AddComponentMenu("UI/Effects/Extensions/CurvedText")]
public class CurvedText : BaseMeshEffect
{
    public float radius = 600;
    [Range(0, 360)]
    [SerializeField]
    public Double singleAngle =
 
 5;
    private float lenghOfWord = 0;

    public override void ModifyMesh(VertexHelper vh)
    {
        if (!IsActive())
        {
            return;
        }
        DotModel dotModel = new DotModel();
        int dotNum = vh.currentVertCount / 4;
        float midNum = (dotNum - 1) / 2;

        for
 
(int i = 0; i < dotNum; i++)
        {
            PopulateUIVertex(vh, i * 4, ref dotModel);//初始化了點集對應的點
            UIVertex lb = new UIVertex();
            //lb 左下  lt左上  rt 右上 ，rb右下
            vh.PopulateUIVertex(ref lb, i * 4);
            UIVertex lt = new UIVertex();
            vh.PopulateUIVertex(ref lt, i * 4 + 1);
            UIVertex rt = new UIVertex();
            vh.PopulateUIVertex(ref rt, i * 4 + 2);
            UIVertex rb = new UIVertex();
            vh.PopulateUIVertex(ref rb, i * 4 + 3);

            //計算平移量
            Double angle = (midNum - i) * singleAngle * Math.PI / 180.0;
            Double distance = Math.Sin(angle / 2) * radius * 2;
            float x = -Convert.ToInt16(Math.Cos(angle/2) * distance) + (midNum - i)* lenghOfWord;
            float y = -Math.Abs(Convert.ToInt16(Math.Sin(angle / 2) * distance));
            //對點進行平移
            lb.position.x += x;
            lt.position.x += x;
            rt.position.x += x;
            rb.position.x += x;
            lb.position.y += y;
            lt.position.y += y;
            rt.position.y += y;
            rb.position.y += y;
            //計算旋轉量
            Vector3 center = Vector3.Lerp(lb.position, rt.position, 0.5f);   //文字的中心點
            float width = Vector3.Distance(lb.position, center);   //對角線長度一半
            Double distance2 = Math.Abs(Math.Sin(angle / 2) * width * 2);
            float s = Convert.ToSingle(Math.Abs(Math.Cos(angle / 2) * distance2));
            float b = Convert.ToSingle(Math.Abs(Math.Sin(angle / 2) * distance2));
            //Debug.Log("width:"+ width + "    distance2:"+ distance2 + "  s:" + s + "   b:" + b);
            if ((i - midNum) < 0 ){
                lb.position.x += b;
                lt.position.x -= s;
                rt.position.x -= b;
                rb.position.x += s;
                lb.position.y -= s;
                lt.position.y -= b;
                rt.position.y += s;
                rb.position.y += b;
            }
            else
            {
                lb.position.x += s;
                lt.position.x -= b;
                rt.position.x -= s;
                rb.position.x += b;
                lb.position.y -= b;
                lt.position.y -= s;
                rt.position.y += b;
                rb.position.y += s;
            }
            
            //重新整理4個頂點
            vh.SetUIVertex(lb, i * 4);
            vh.SetUIVertex(lt, i * 4 + 1);
            vh.SetUIVertex(rt, i * 4 + 2);
            vh.SetUIVertex(rb, i * 4 + 3);
        }
        //Debug.Log("lenghOfWord:" + lenghOfWord);
    }
    void PopulateUIVertex(VertexHelper vh, int index, ref DotModel dotModel)
    {
        vh.PopulateUIVertex(ref dotModel.lb, index);
        vh.PopulateUIVertex(ref dotModel.lt, index + 1);
        vh.PopulateUIVertex(ref dotModel.rt, index + 2);
        vh.PopulateUIVertex(ref dotModel.rb, index + 3);
        lenghOfWord = Math.Abs(dotModel.rb.position.x - dotModel.rt.position.x);
    }
}

效果圖