winform 热词从背景图中间向四周发散效果

经理提了个小功能，从数据库读取出关键词然后窗体放个背景图片关键词从图片中间一个一个出来然后慢慢向四周发散的效果。文字大小和颜色可以控制

首先设置 Form的 BackgroundImage 属性设置窗体的背景图

然后添加2个timer 控件 timer1和timer2，设置Interval =300 ，其中 timer1 用来隔0.3s通过GDI+ DrawString， timer2 用来隔0.3s 添加关键词

上代码：

  private void timer1_Tick(object sender, EventArgs e)
        {
            if (SC != null)
            {
                img = Image.FromFile(".\\logo.png");
                SC.Reflash();
                Graphics g = Graphics.FromImage(img);
                SC.Print(g);
                g.Dispose();
                this.BackgroundImage = img;
            }

        }

 private void timer2_Tick(object sender, EventArgs e)
        {
            List<string> names = str;
            List<int> list = new List<int>();

            if (!list.Contains(chunum))
            {
                if (chunum < names.Count)
                {
                    list.Add(chunum);
                    lock (SC)
                    {
                        SC.AddKey(names[chunum], chunum);
                    }
                    chunum++;
                }
            }
        }

        List<string> str = new List<string> { "小胖人", "我的信", "hello", "加油", "你是谁", "张三是", "理顺了", "万城" };

SC是个自定义类 ShowClass 里面有字体大小颜色

public class ShowClass
    {
        public int firstVal = 0;
        public int secondVal = 0;

        public Size winsize;
        public int keylens;
        public int keylene;
        public int fontsizes;
        public int fontsizee;
        public Color fontcolor;
        public List<View> lv = new List<View>();
        public ShowClass(Size size, int keylens, int keylene, int fontsizes, int fontsizee, Color fontcolor)
        {
            this.winsize = size;
            this.keylens = keylens;
            this.keylene = keylene;
            this.fontsizes = fontsizes;
            this.fontsizee = fontsizee;
            this.fontcolor = fontcolor;
        }
        public void AddKey(string key, int chunum)
        {
            if (lv.Count() < keylene)
            {
                lv.Add(new View(key, chunum, fontsizes, fontsizee, fontcolor, winsize));
            }
        }

        internal View IsInView(int x, int y)
        {
            foreach (View v in lv)
            {
                if (v.isInRec(new Point(x, y)))
                {
                    return v;
                }
            }
            return null;

        }

        internal void Print(Graphics g)
        {
            foreach (View x in lv)
            {
                x.Print(g);
            }
        }
        internal void Reflash()
        {
           
            for (int i = 0; i < lv.Count; i++)
            {
                if (i == 0 && firstVal < 3)
                {
                    firstVal++;
                    lv[i].Reflash(0);
                }

                else if (i > 0 && secondVal < 150)
                {
                    secondVal++;
                    lv[i].Reflash(i);
                }

            }
        }

　　Print 里面就是通过GDI+ 来实现在背景图上画字 g.DrawString(text, new Font(font, fsize), new SolidBrush(cl), new Point(x, y));

第二个参数可以控制字体大小最后一个参数Point就是坐标可以通过随机数来确定文字发散方向及x, y 的距离

来个最终效果图关键词发散方向和距离都是随机的

原文地址：https://www.cnblogs.com/alonglonga/p/12288781.html 小赫赫首发

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winform 热词从背景图中间向四周发散效果

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