winform下图片+文字 跑马灯功能实现

x年没写.net的程序了，工作需要写个跑马灯程序，也当找找感觉吧。

天下文章一大抄，这个代码也是从网上的一个原型修改而来的...以后我可能要接触比较多的.net下的应用，大家多交流...

【运行效果】从右至左跑动



【资源列表】背景是一个空白图片



【实现原理】

创建一个picturebox，然后在其grapics循环(位移)绘制imgage和string。

与主窗口为同一线程，CPU占用率可接受；对于屏幕抖动没有做太多处理，对于我当前的产品已经够用了。

【源代码】

namespace WindowsFormsApplication1

{

public partial class Form1 : Form

{

#region 全局变量

System.Windows.Forms.PictureBox m_pbPicRoll; // 界面容器

List<Image> m_lsImages = new List<Image>();

List<string> m_lsImageNames = new List<string>();

Graphics m_ghContainer;

Image m_imgBackground;

Rectangle m_rcShowRegion;

int m_nCurImgIndex = 0; // 当前显示的图片

int m_nImgHeight; // 图片呈现的高度

int m_nImgWidth; // 图片呈现的宽度

int m_nScrollDelta; // 图片滚动边距

int m_nScrollPicNums; // 屏幕呈现的图片数

int m_nTitleRegionHeight;// 文字区高度

Font m_ftPicTileFont;

SolidBrush m_bhPicTitleBrush;

StringFormat m_sfTitleFormat;

Timer tm_Roll = new Timer();

#endregion 全局变量

public Form1()

{

InitializeComponent();

this.form_layout();



}

private void form_layout()

{

this.DoubleBuffered = true;

this.StartPosition = FormStartPosition.CenterScreen;

this.Size = new Size(800, 800);

this.BackColor = Color.LightBlue;

m_pbPicRoll = new PictureBox();

m_pbPicRoll.Location = new Point(50, 50);

m_pbPicRoll.Size = new Size(600, 300);

this.Controls.Add(m_pbPicRoll);

}

private void Form1_Load(object sender, EventArgs e)

{

this.init_img_roll();

}

public static string get_filename(String path)

{

if (path.Contains("\\"))

{

string[] arr = path.Split('\\');

return arr[arr.Length - 1];

}

else

{

string[] arr = path.Split('/');

return arr[arr.Length - 1];

}

}

private void init_img_roll()

{

m_imgBackground = Image.FromFile(string.Format("{0}/Images/bg.png", Application.StartupPath));

string[] strImgFiles = Directory.GetFiles(string.Format("{0}/Images", Application.StartupPath), "*.jpg");

string strImgFormat = ".jpg";

char[] szTemp = strImgFormat.ToCharArray();

string strFileName;

foreach (string str_path in strImgFiles)

{

m_lsImages.Add(Image.FromFile(str_path));

strFileName = get_filename(str_path).TrimEnd(szTemp);

m_lsImageNames.Add(strFileName);

}

m_ghContainer = m_pbPicRoll.CreateGraphics();

m_nImgHeight = 200;

m_nImgWidth = 200;

m_nScrollPicNums = m_pbPicRoll.Width / m_nImgWidth + 1; // 每次滚的图片个数

m_nTitleRegionHeight = 30;

m_ftPicTileFont = new Font("Arial", 14);

m_bhPicTitleBrush = new SolidBrush(Color.Black);

m_sfTitleFormat = new StringFormat();

m_sfTitleFormat.Alignment = StringAlignment.Center;

m_rcShowRegion = new Rectangle(new Point(0, 0), new Size(m_pbPicRoll.Width, m_nImgHeight + m_nTitleRegionHeight));

tm_Roll.Interval = 150;

tm_Roll.Tick += new EventHandler(timer_roll_tick);

tm_Roll.Start();

}

private void timer_roll_tick(object sender, EventArgs e)

{

if (Math.Abs(m_nScrollDelta) >= m_nImgHeight) // 图片顶端滚出picturebox

{

m_nCurImgIndex = (++m_nCurImgIndex) % m_lsImages.Count;

m_nScrollDelta = 0;

}



Bitmap btPrestScope = new Bitmap(m_pbPicRoll.Width, m_nImgHeight + m_nTitleRegionHeight);

Graphics ghPrestScope = Graphics.FromImage(btPrestScope);

// 仅刷新文字区背景，以解决文字覆盖问题

ghPrestScope.DrawImage(m_imgBackground,m_rcShowRegion);

for (int i = 0; i < m_nScrollPicNums; i++ )

{

ghPrestScope.DrawImage(m_lsImages[(m_nCurImgIndex + i) % m_lsImages.Count],

new Rectangle(new Point(m_nScrollDelta + i * m_nImgWidth, 0),

new Size(m_nImgWidth - 10, m_nImgHeight - 10))); // 10为了图片与周围拉开距离

ghPrestScope.DrawString(m_lsImageNames[(m_nCurImgIndex + i) % m_lsImageNames.Count],

m_ftPicTileFont,

m_bhPicTitleBrush,

new Point(m_nScrollDelta + (int)((i+0.5) * m_nImgWidth), 200 + 2), // 0.5为了居中，2为了垂直拉开点距离

m_sfTitleFormat);

}

m_ghContainer.DrawImage(btPrestScope,m_rcShowRegion);

ghPrestScope.Dispose();

btPrestScope.Dispose();

m_nScrollDelta -= 2; // 每次滚动2个像素

}

}

}

增加鼠标点击图片操作

private void onmouseclick_picroll(object sender, MouseEventArgs e)
        {                
            int nReminder = 0, nQuotient = 0, nClickedImgIndex = 0;
            nQuotient = Math.DivRem(e.X - m_nScrollDelta, m_nImgWidth,out nReminder); // m_nScrollDelta在本例中必为负数
            nClickedImgIndex = (m_nCurImgIndex + nQuotient) % m_lsImages.Count;

            System.Console.WriteLine(string.Format("x:{0}, y:{1}, scroll:{2},regionindex is {3}, offset is {4}", 
                e.X, e.Y, m_nScrollDelta, nQuotient, nReminder));

            if (nClickedImgIndex < m_lsImageNames.Count)
            {
                System.Console.WriteLine(m_lsImageNames[nClickedImgIndex]);
                MessageBox.Show(string.Format("您现在点击的特色农业是：{0}",m_lsImageNames[nClickedImgIndex]),"test");
            }
            else
            {
                System.Console.WriteLine(string.Format("out of index:{0}, we must have a global exception handler.",
                    nClickedImgIndex));

            }
        }

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