cyclss 2018-03-20 07:03 采纳率: 0%
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异形透明窗体alphaform,如何跟随form移动,

图片说明
picturebox1为相机采集的视频窗口,当点击button1时,弹出透明异形窗体AlphaForm并显示红方框,现在的问题是,当鼠标点击Form1标题栏移动时,AlphaForm是固定的,如何让AlphaForm跟随移动,还有红框相对于 picturebox1 坐标如何计算,窗体代码如下:
请教详细思路与代码实现,本人菜鸟,基础薄弱

 namespace WindowsFormsApplication4
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            pictureBox1.Load(@"c:\u.png");
        }
        private void button1_Click(object sender, EventArgs e)
        {
            Bitmap bmp = new Bitmap(200, 200);
            Graphics g = Graphics.FromImage(bmp);
            Pen p = new Pen(Color.Red, 2);
            g.DrawRectangle(p, 0, 0, 50, 50);

            AlphaForm putForm = new AlphaForm(); //alpha通道的显示图像窗体
            putForm.Location = new Point(200, 200);
            putForm.SetBitmap(bmp, 255); //设置图像 
            putForm.Show(); //显示窗体
        }
    }
}


namespace WindowsFormsApplication4
{
    public partial class AlphaForm : Form
    {
        class Alpha_Win32
        {
            public enum Bool
            {
                False = 0,
                True
            };

            [StructLayout(LayoutKind.Sequential)]
            public struct Point
            {
                public Int32 x;
                public Int32 y;

                public Point(Int32 x, Int32 y) { this.x = x; this.y = y; }
            }

            [StructLayout(LayoutKind.Sequential)]
            public struct Size
            {
                public Int32 cx;
                public Int32 cy;

                public Size(Int32 cx, Int32 cy) { this.cx = cx; this.cy = cy; }
            }

            [StructLayout(LayoutKind.Sequential, Pack = 1)]
            struct ARGB
            {
                public byte Blue;
                public byte Green;
                public byte Red;
                public byte Alpha;
            }

            [StructLayout(LayoutKind.Sequential, Pack = 1)]
            public struct BLENDFUNCTION
            {
                public byte BlendOp;
                public byte BlendFlags;
                public byte SourceConstantAlpha;
                public byte AlphaFormat;
            }

            public const Int32 ULW_COLORKEY = 0x00000001;
            public const Int32 ULW_ALPHA = 0x00000002;
            public const Int32 ULW_OPAQUE = 0x00000004;

            public const byte AC_SRC_OVER = 0x00;
            public const byte AC_SRC_ALPHA = 0x01;


            [DllImport("user32.dll", ExactSpelling = true, SetLastError = true)]
            public static extern Bool UpdateLayeredWindow(IntPtr hwnd, IntPtr hdcDst, ref Point pptDst, ref Size psize, IntPtr hdcSrc, ref Point pprSrc, Int32 crKey, ref BLENDFUNCTION pblend, Int32 dwFlags);

            [DllImport("user32.dll", ExactSpelling = true, SetLastError = true)]
            public static extern IntPtr GetDC(IntPtr hWnd);

            [DllImport("user32.dll", ExactSpelling = true)]
            public static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);

            [DllImport("gdi32.dll", ExactSpelling = true, SetLastError = true)]
            public static extern IntPtr CreateCompatibleDC(IntPtr hDC);

            [DllImport("gdi32.dll", ExactSpelling = true, SetLastError = true)]
            public static extern Bool DeleteDC(IntPtr hdc);

            [DllImport("gdi32.dll", ExactSpelling = true)]
            public static extern IntPtr SelectObject(IntPtr hDC, IntPtr hObject);

            [DllImport("gdi32.dll", ExactSpelling = true, SetLastError = true)]
            public static extern Bool DeleteObject(IntPtr hObject);
        }
        public AlphaForm()
        {
            FormBorderStyle = FormBorderStyle.None;
            DoubleBuffered = true;
            TopMost = true;
        }
         public void SetBitmap(Bitmap bitmap)
    {
        SetBitmap(bitmap, 255);
    }

    public void SetBitmap(Bitmap bitmap, byte opacity)
    {
        /*
        if (bitmap.PixelFormat != PixelFormat.Format32bppArgb)
            throw new ApplicationException("The bitmap must be 32ppp with alpha-channel."+ bitmap.PixelFormat);
        */
        IntPtr screenDc = Alpha_Win32.GetDC(IntPtr.Zero);
        IntPtr memDc = Alpha_Win32.CreateCompatibleDC(screenDc);
        IntPtr hBitmap = IntPtr.Zero;
        IntPtr oldBitmap = IntPtr.Zero;

        try
        {
            hBitmap = bitmap.GetHbitmap(Color.FromArgb(0));
            oldBitmap = Alpha_Win32.SelectObject(memDc, hBitmap);

            Alpha_Win32.Size size = new Alpha_Win32.Size(bitmap.Width, bitmap.Height);
            Alpha_Win32.Point pointSource = new Alpha_Win32.Point(0, 0);
            Alpha_Win32.Point topPos = new Alpha_Win32.Point(Left, Top);
            Alpha_Win32.BLENDFUNCTION blend = new Alpha_Win32.BLENDFUNCTION();
            blend.BlendOp = Alpha_Win32.AC_SRC_OVER;
            blend.BlendFlags = 0;
            blend.SourceConstantAlpha = opacity;
            blend.AlphaFormat = Alpha_Win32.AC_SRC_ALPHA;

            Alpha_Win32.UpdateLayeredWindow(Handle, screenDc, ref topPos, ref size, memDc, ref pointSource, 0, ref blend, Alpha_Win32.ULW_ALPHA);
            GC.Collect();
        }
        finally
        {
            Alpha_Win32.ReleaseDC(IntPtr.Zero, screenDc);
            if (hBitmap != IntPtr.Zero)
            {
                Alpha_Win32.SelectObject(memDc, oldBitmap);
                Alpha_Win32.DeleteObject(hBitmap);
            }
            Alpha_Win32.DeleteDC(memDc);
        }
    }

    protected override CreateParams CreateParams
    {
        get
        {
            CreateParams cp = base.CreateParams;
            cp.ExStyle |= 0x00080000; 
            return cp;
        }
    }

我最终想要这种效果图片说明
这种效果代码如何实现

  • 写回答

1条回答 默认 最新

  • Go 旅城通票 2018-03-20 07:49
    关注

    Form1添加LocationChanged事件更新下AlphaForm的location属性就行了,AlphaForm初始化的时候获取Form1的location,固定下AlphaForm的位置

     AlphaForm putForm;//放外面来
            private void button1_Click(object sender, EventArgs e)
            {
                Bitmap bmp = new Bitmap(200, 200);
                Graphics g = Graphics.FromImage(bmp);
                Pen p = new Pen(Color.Red, 2);
                g.DrawRectangle(p, 0, 0, 50, 50);
    
                putForm = new AlphaForm(); //alpha通道的显示图像窗体
                putForm.Location = new Point(this.Location.X+100, this.Location.Y+100);//框显示在Form1  100x100的位置
                putForm.SetBitmap(bmp, 255); //设置图像 
                putForm.Show(this); //显示窗体
            }
    
            private void Form1_LocationChanged(object sender, EventArgs e)
            {//更新
                if (putForm != null) putForm.Location = new Point(this.Location.X + 100, this.Location.Y + 100);
            }
    
    评论

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