13518219792
在窗体上拉一个Timer控件，enabled设为true，Interval设为20。完整代码如下： Dim myPen As New System.Drawing.Pen(System.Drawing.Color.Red)
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Dim formGraphics As System.Drawing.Graphics
Dim num As Integer = 1
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
Me.Refresh() '清屏
formGraphics = Me.CreateGraphics()
formGraphics.DrawEllipse(myPen, New Rectangle(100, 100, num, num)) '在坐标(100,100)的位置画圆
If num 200 Then '如果大于200则停止画圆
myPen.Dispose()
formGraphics.Dispose()
Timer1.Enabled = False
Else
num = num + 1
End If
End Sub
首先，设定Timer控件的Enabled属性为True，Interval属性为1000（单位为毫秒）。
然后，添加程序代码如下：
private void timer1_Tick(object sender, EventArgs e)
{
if (this.label1.BackColor == Color.Red) //判断当前背景色是否为红色
this.label1.BackColor = Color.Blue; //如果是则变为蓝色
else //如果当前背景色不是红色
this.label1.BackColor = Color.Red; //将背景色变为红色
}
也容易，如果是黑白三个颜色加上相同的渐变量，彩色的是起始颜色的三个分量与终止颜色的对应三个分量的差值，再除于相同的份数，就得出三原色各自的步进量。
窗体上放个图片框试试下面代码：
Private Sub PictureBox1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles PictureBox1.Paint
Dim startColor As Color = Color.Red
Dim endColor As Color = Color.Green
Dim s As String = "vb.net 如何使文字能渐变颜色，就是颜色慢慢变淡然后在慢慢恢复？"
Dim Steps As Integer = s.Length \ 2
Dim StepR As Integer = (CInt(endColor.R) - startColor.R) \ Steps
Dim StepG As Integer = (CInt(endColor.G) - startColor.G) \ Steps
Dim StepB As Integer = (CInt(endColor.B) - startColor.B) \ Steps
Dim R As Integer = startColor.R
Dim G As Integer = startColor.G
Dim B As Integer = startColor.B
Dim drawFont As New System.Drawing.Font("Arial", 16)
Dim X As Integer = 50
For i As Integer = 1 To Steps
Dim drawBrush As New SolidBrush(Color.FromArgb(R, G, B))
e.Graphics.DrawString(s.Substring(i - 1, 1), drawFont, drawBrush, X, 50.0)
X += 18
R += StepR
G += StepG
B += StepB
Next
For i As Integer = 1 To Steps
Dim drawBrush As New SolidBrush(Color.FromArgb(R, G, B))
e.Graphics.DrawString(s.Substring(i + Steps - 1, 1), drawFont, drawBrush, X, 50.0)
X += 18
R -= StepR
G -= StepG
B -= StepB
Next
End Sub
