源码下载:http://download.csdn.net/detail/llftc/3990138
根据论坛中的问题制作的小游戏,是圣诞节桌面下雪的小程序,喜欢的请下载。
要生产的雪花飘动,并随即生成多种大小的雪花,需要单独定义一个雪花类,
然在Timer事件中进行雪花移动的处理,代码如下:
private void timer_Tick(object sender, EventArgs e)
{
Tick++;
if (Tick % 10 == 0)
{
SnowFlake s = new SnowFlake();
Random rd = new Random();
s.X = rand.Next(-20, this.Width + 20);
s.Y = 0f;
s.XVelocity = (float)(rand.NextDouble() - 0.5f) * 2f;
s.YVelocity = (float)(rand.NextDouble() * 3) + 1f;
s.Rotation = rand.Next(0, 359);
s.RotVelocity = rand.Next(-3, 3) * 2;
s.image = Image.FromFile(@"Resources\" + rd.Next(1, 4) + ".gif");
if (s.RotVelocity == 0)
{
s.RotVelocity = 3;
}
s.Scale = (float)(rand.NextDouble() / 2) + 0.75f;
SnowFlakes.Add(s);
}
Graphics g = Graphics.FromImage(screenImage);
g.Clear(Color.Transparent);
g.SmoothingMode = SmoothingMode.HighSpeed;
for (int i = 0; i < SnowFlakes.Count; i++)
{
SnowFlake s1 = SnowFlakes[i];
s1.X += s1.XVelocity;
s1.Y += s1.YVelocity;
s1.Rotation += s1.RotVelocity;
s1.XVelocity += ((float)rand.NextDouble() - 0.5f) * 0.7f;
s1.XVelocity = Math.Max(s1.XVelocity, -2f);
s1.XVelocity = Math.Min(s1.XVelocity, +2f);
if (s1.Y > this.Height)
{
SnowFlakes.RemoveAt(i);
}
else
{
g.ResetTransform();
g.TranslateTransform(-16, -16, MatrixOrder.Append); //pan
g.ScaleTransform(s1.Scale, s1.Scale, MatrixOrder.Append); //scale
g.RotateTransform(s1.Rotation, MatrixOrder.Append); //rotate
g.TranslateTransform(s1.X, s1.Y, MatrixOrder.Append); //pan
g.DrawImage(s1.image, 0, 0); //draw
}
}
g.Dispose();
SetBackground(screenImage);
}
如果直接获取windows桌面的句柄,并在上面画图的话,画出来的图很容易被刷新掉。
所以我使用下列方法,将一个大的Form涂层Top到桌面顶端。
try
{
Bitmap bitmap = (Bitmap)img;
if (bitmap.PixelFormat != PixelFormat.Format32bppArgb)
{
throw new ApplicationException();
}
IntPtr hObject = IntPtr.Zero;
IntPtr zero = IntPtr.Zero;
IntPtr hDC = Win32.GetDC(IntPtr.Zero);
IntPtr ptr2 = Win32.CreateCompatibleDC(hDC);
try
{
hObject = bitmap.GetHbitmap(Color.FromArgb(0));
zero = Win32.SelectObject(ptr2, hObject);
Win32.Size size2 = new Win32.Size(bitmap.Width, bitmap.Height);
Win32.Size psize = size2;
Win32.Point point3 = new Win32.Point(0, 0);
Win32.Point pprSrc = point3;
point3 = new Win32.Point(base.Left, base.Top);
Win32.Point pptDst = point3;
Win32.BLENDFUNCTION pblend = new Win32.BLENDFUNCTION();
pblend.BlendOp = 0;
pblend.BlendFlags = 0;
pblend.SourceConstantAlpha = 0xff;
pblend.AlphaFormat = 1;
Win32.UpdateLayeredWindow(this.Handle, hDC, ref pptDst, ref psize, ptr2, ref pprSrc, 0, ref pblend, 2);
}
catch (Exception exception1)
{
Exception exception = exception1;
throw exception;
}
finally
{
Win32.ReleaseDC(IntPtr.Zero, hDC);
if (hObject != IntPtr.Zero)
{
Win32.SelectObject(ptr2, zero);
Win32.DeleteObject(hObject);
}
Win32.DeleteDC(ptr2);
}
}
catch (Exception e)
{
MessageBox.Show(e.Message);
}
附截图:
先写这些吧,源码我已经传到CSDN上,下载地址如下:
http://download.csdn.net/detail/llftc/3990138