// 使用迭代器實現(xiàn)文字的動態(tài)效果
// 給窗體添加背景圖
using System.Resources;
 
namespace _123
{
    public partial class Form1 : Form
    {
        private Panel? panel1;
 
        public Form1()
        {
            InitializeComponent();
            BackgroundImage = Properties.Resources.GetObject("bc");
            BackgroundImageLayout = ImageLayout.Stretch;
            StartPosition = FormStartPosition.CenterScreen;
            Load += Form1_Load;
        }
 
        private void Form1_Load(object? sender, EventArgs e)
        {
            // 
            // panel1
            // 
            panel1 = new Panel
            {
                Location = new Point(321, 12),
                Name = "panel1",
                Size = new Size(250, 83),
                TabIndex = 0
            };
            // 
            // Form1
            // 
            AutoScaleDimensions = new SizeF(7F, 17F);
            AutoScaleMode = AutoScaleMode.Font;
            ClientSize = new Size(600, 416);
            Controls.Add(panel1);
            Name = "Form1";
            Text = "使用迭代器實現(xiàn)文字的動態(tài)效果";
 
            //Graphics Car_Paint = panel1.CreateGraphics();//實例化繪圖對象
            string CartoonString = "編程詞典網(wǎng)";            //定義要繪制的動態(tài)文字
            Character character = new();                   //實例化自定義類對象
            character.CartoonEffect(panel1, CartoonString);//在窗體上顯示動態(tài)文字
        }
    }
 
    class Character
    {
        Graphics? graphics;                           //定義Graphics對象
        static readonly int[] FSize = [20, 25, 30];   //設(shè)置字體的大小
        readonly int Str_block = 5;                   //字體間的間隔
        readonly Font Str_Font = new("宋體", FSize[0], FontStyle.Bold);//定義字體樣式
        readonly Color Str_Color = Color.Orange;      //定義字體顏色
        float Str_Width = 0;    //獲取字符串的位置
        float Str_Height = 0;
        float Panel_W = 0;      //獲取控件的寬度
        float Panel_H = 0;      //獲取控件的高度
        Color Panel_C;          //記錄控件的背景顏色
        float Str_Odd_Width = 0;//獲取單個文字的寬度
        Thread? thread;         //定義線程
 
        /// <summary>
        /// 在Panel控件中繪制動畫文字
        /// </summary>
        /// <param Panel="C_Panel">顯示文字的容器控件</param>
        /// <param string="C_Str">文字字符串</param>
        public void CartoonEffect(Panel C_Panel, string C_Str)
        {
            graphics = C_Panel.CreateGraphics();//為控件創(chuàng)建Graphics對象
            Panel_H = C_Panel.Height;           //獲取控件的高度
            Panel_W = C_Panel.Width;            //獲取控件的寬度
            Panel_C = C_Panel.BackColor;        //獲取控件背景顏色
            GetTextInfo(C_Str);                 //獲取文字的大小及位置
            graphics.FillRectangle(             //用控件背景填充控件
                new SolidBrush(Panel_C), 0, 0, Panel_W, Panel_H);
            DrawFullText(C_Str, 0);             //繪制文字
            //實例化ParameterizedThreadStart委托線程
            thread = new Thread(new ParameterizedThreadStart(DynamicText!));
            thread.Start(C_Str);                //傳遞一個字符串的參數(shù)
        }
 
        /// <summary>
        /// 獲取文字的大小及繪制位置
        /// </summary>
        /// <param string="C_Str">文字字符串</param>
        public void GetTextInfo(string C_Str)
        {
            SizeF TitSize = graphics!.MeasureString(C_Str, Str_Font); //將繪制的字符串進行格式化
            Str_Width = TitSize.Width;                           //獲取字符串的寬度
            Str_Height = TitSize.Height;                         //獲取字符串的高度
            Str_Odd_Width = Str_Width / C_Str.Length;            //獲取單個文字的寬度
            Str_Width = (Str_Odd_Width + Str_block) * C_Str.Length; //獲取文字的寬度
            Str_Width = (Panel_W - Str_Width) / 2F;              //使文字居中
            Str_Height = Panel_H - Str_Height;                   //使文字顯示在控件底端
        }
 
        /// <summary>
        /// 繪制全部文字
        /// </summary>
        /// <param string="C_Str">繪制的文字字符串</param>
        public void DrawFullText(string C_Str, int n)
        {
            float Str_Place = Str_Width;          //單個字符的位置
            for (int i = 0; i < C_Str.Length; i++)//遍歷字符串中的文字
            {
                if (i != n)
                    DrawText(C_Str[i].ToString(), Str_Font, Str_Place, Str_Height); //繪制單個文字
                Str_Place += Str_Odd_Width + Str_block;                             //獲取下一個文字的位置
            }
        }
 
        /// <summary>
        /// 繪制單個文字
        /// </summary>
        /// <param name="C_Odd_Str">單個文字字符串</param>
        /// <param name="S_Font">文本樣式</param>
        /// <param name="left"></param>
        /// <param name="top"></param>
        public void DrawText(string C_Odd_Str, Font S_Font, float left, float top)
        {
            graphics!.DrawString(C_Odd_Str, S_Font, new SolidBrush(Str_Color), new PointF(left, top));//繪制字符串中單個文字
        }
 
        /// <summary>
        /// 通過迭代器實現(xiàn)字符串的遍歷
        /// </summary>
        /// <param string="n">文字字符串</param>
        /// <returns>返回單個文字</returns>
        public static IEnumerable<object> Transpose(string n)
        {
            if (n.Length > 0)
            {
                foreach (object i in n)
                    yield return i;
            }
        }
 
        /// <summary>
        /// 繪制動態(tài)文字
        /// </summary>
        /// <param string="C_Str">繪制的文字字符串</param>
        public void DynamicText(Object C_Str)
        {
            float tem_left = 0;             //獲取當前文字的左端位置
            float tem_top = 0;              //獲取當前文字的頂端位置
            float tem_width = 0;            //獲取文字的寬度
            float tem_high = 0;             //獲取文字的高度
            float tem_place = Str_Width;    //獲取起始文字的位置
            Font Tem_Font = new("黑體", FSize[0], FontStyle.Bold);//定義字體樣式
            int p = 0;                      //記錄字符串中文字的索引號
            int Str_Index = 0;
            try
            {
                foreach (object s in Transpose(C_Str.ToString()!))//遍歷字符串
                {
                    for (int i = 1; i < 5; i++)
                    {
                        if (i >= 3)
                            p = Convert.ToInt16(Math.Floor(i / 2F));
                        else
                            p = i;
                        DrawFullText(C_Str.ToString()!, Str_Index);
                        Tem_Font = new Font("黑體", FSize[p], FontStyle.Bold);//定義字體樣式            
                        SizeF TitSize = graphics!.MeasureString(s.ToString(),Str_Font);//將繪制的單個文字進行格式化 
                        tem_width = TitSize.Width;//獲取文字的寬度
                        tem_high = TitSize.Height;//獲取文字串的高度
                        tem_left = tem_place - (tem_width - Str_Odd_Width) / 2F;//獲取文字改變大小后的左端位置       
                        tem_top = Str_Height - (Str_Height - tem_high) / 2F;  //獲取文字改變大小后的頂端位置              
                        DrawText(s.ToString()!, Tem_Font, tem_left, tem_top); //繪制單個文字             
                        Thread.Sleep(200);         //待待0.2秒
                        graphics.FillRectangle(new SolidBrush(Panel_C), 0, 0, Panel_W,Panel_H);//清空繪制的文字
                    }
                    tem_place += Str_Odd_Width + Str_block;//計算下一個文字的左端位置                               
                    Str_Index += 1;                 //將索引號定位到下一個文字
                }
                DrawFullText(C_Str.ToString()!, -1);//恢復(fù)文字的原始繪制樣式
                //實例化ParameterizedThreadStart委托線程
                thread = new Thread(new ParameterizedThreadStart(DynamicText!));
                thread.Start(C_Str);                 //傳遞一個字符串的參數(shù)
            }
            catch//這里之所以用異常語句，是在關(guān)閉窗體時關(guān)閉線程
            {
                //thread.Abort();   //已經(jīng)廢棄
                thread!.Interrupt(); //關(guān)閉線程
            }
        }
    }
}