雪花类

class asnow

{

public int m_size;

public int m_x;

public int m_y;

public int m_xspeed;

public int m_yspeed;

private Random rd=new Random();

public asnow(int rdi)

{

replay(rdi);

}

public void speedchange()

{

m_xspeed =( m_xspeed + rd.Next(0, 3) - 1)%3;

}

public void replay(int rdi)//雪花落下后重新生成自顶部落下

{

Random rdres = new Random(rd.Next()+rdi);

int xmin = 10;

int xmax = Screen.PrimaryScreen.Bounds.Width-10;

int ymax=Screen.PrimaryScreen.Bounds.Height/2;

m_size = rdres.Next(10, 25);

m_x = rd.Next(xmin, xmax);

m_y = -rd.Next(0, ymax);

m_xspeed = 0;

m_yspeed = (m_size -5)/5;

Thread.Sleep(1);

}

}

下雪的方法写在timer事件中

private void timer1_Tick(object sender, EventArgs e)

{

string s1 = "你在身边时，你是一切" ;

string s2 = "你不在身边时，一切是你";

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

{

snows[i].m_x += snows[i].m_xspeed ;

snows[i].m_y += snows[i].m_yspeed;

snows[i].speedchange();

if (snows[i].m_y > Screen.PrimaryScreen.Bounds.Height)

{

snows[i].replay(i);

}

}

Graphics gr=this.CreateGraphics();

gr.Clear(Color.Black);

PaintEventArgs er = new PaintEventArgs(gr, ClientRectangle);

this.OnPaint(er);

}

绘制函数

protected override void OnPaint(PaintEventArgs e)

{

Graphics g = e.Graphics;

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

{

if(snows[i].m_x>=0&&snows[i].m_y>=0)

g.FillEllipse(Brushes.White, snows[i].m_x, snows[i].m_y, snows[i].m_size, snows[i].m_size);

}

}

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本文标题：用C#程序实现桌面下雪效果，责任编辑：宏鹏，来源：武汉北大青鸟鲁广校区栏目，于01-28发布于北大青鸟鲁广校区。用C#程序实现桌面下雪效果，雪花落下后重新生成自顶部落下。