سلام
مبحثی هست به اسم Alpha Blend ، مطالعه لینک های زیر میتونه کمکتون کنه
http://www.codeproject.com/Articles/20758/Alpha-Blended-Windows-Forms
http://www.codeproject.com/Articles/1822/Per-Pixel-Alpha-Blend-in-C
موفق باشید.
ممنونم بابت پاسخ
من یکی از پروژه ها رو دانلود کردم ولی راستش از ساختارش سر در نیاوردم(البته کاری که میخام رو انجام داد)
تو این پروژه ای که دانلود کردم یه فایل Build هست که وقتی اجرا میشه یه نرم افزار میسازه که یه فرم داره
داخل این فرم یه عکس PNG رو Drag & Drop میکنی دقیقا نمایش میده و همون چیزی هست که میخام
ولی این پروژه Solution نداره فقط دوتا فایل cs داره که کدش رو اینجا میذارم اگر امکانش هست یه نگاه بندازین و یه توضیح بدین که من برا
فرم لاگین به اون شکلی که نمایش دادم نیاز به کدوم قسمتها دارم
ممنونم
البته به غیر از این کدی که قرار دادم(کدهای یکی از فایلها)یه فایل دیگه هم هست به نام Main.cs :متفکر:
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Windows.Forms;
using System.Runtime.InteropServices;
// class that exposes needed win32 gdi functions.
class 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);
}
/// <para>Your PerPixel form should inherit this class</para>
/// <author><name>Rui Godinho Lopes</name><email>rui@ruilopes.com</email></author>
class PerPixelAlphaForm : Form
{
public PerPixelAlphaForm()
{
// This form should not have a border or else Windows will clip it.
FormBorderStyle = FormBorderStyle.None;
}
/// <para>Changes the current bitmap.</para>
public void SetBitmap(Bitmap bitmap)
{
SetBitmap(bitmap, 255);
}
/// <para>Changes the current bitmap with a custom opacity level. Here is where all happens!</para>
public void SetBitmap(Bitmap bitmap, byte opacity)
{
if (bitmap.PixelFormat != PixelFormat.Format32bppArgb)
throw new ApplicationException("The bitmap must be 32ppp with alpha-channel.");
// The ideia of this is very simple,
// 1. Create a compatible DC with screen;
// 2. Select the bitmap with 32bpp with alpha-channel in the compatible DC;
// 3. Call the UpdateLayeredWindow.
IntPtr screenDc = Win32.GetDC(IntPtr.Zero);
IntPtr memDc = Win32.CreateCompatibleDC(screenDc);
IntPtr hBitmap = IntPtr.Zero;
IntPtr oldBitmap = IntPtr.Zero;
try {
hBitmap = bitmap.GetHbitmap(Color.FromArgb(0)); // grab a GDI handle from this GDI+ bitmap
oldBitmap = Win32.SelectObject(memDc, hBitmap);
Win32.Size size = new Win32.Size(bitmap.Width, bitmap.Height);
Win32.Point pointSource = new Win32.Point(0, 0);
Win32.Point topPos = new Win32.Point(Left, Top);
Win32.BLENDFUNCTION blend = new Win32.BLENDFUNCTION();
blend.BlendOp = Win32.AC_SRC_OVER;
blend.BlendFlags = 0;
blend.SourceConstantAlpha = opacity;
blend.AlphaFormat = Win32.AC_SRC_ALPHA;
Win32.UpdateLayeredWindow(Handle, screenDc, ref topPos, ref size, memDc, ref pointSource, 0, ref blend, Win32.ULW_ALPHA);
}
finally {
Win32.ReleaseDC(IntPtr.Zero, screenDc);
if (hBitmap != IntPtr.Zero) {
Win32.SelectObject(memDc, oldBitmap);
//Windows.DeleteObject(hBitmap); // The documentation says that we have to use the Windows.DeleteObject... but since there is no such method I use the normal DeleteObject from Win32 GDI and it's working fine without any resource leak.
Win32.DeleteObject(hBitmap);
}
Win32.DeleteDC(memDc);
}
}
protected override CreateParams CreateParams
{
get {
CreateParams cp = base.CreateParams;
cp.ExStyle |= 0x00080000; // This form has to have the WS_EX_LAYERED extended style
return cp;
}
}
}