vbnet环渐变 css环形渐变
VB.NET怎么在屏幕上画一个逐渐变大的空心圈？
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
VB点虐 或C#点虐 做按钮动态渐变
我是新手，仅谈谈我的理解，按钮的MouseEnter与MouseLeave事件就可以解决，需要这么复杂吗？
比如当鼠标移入按钮（Button1）时，按钮的字体变色（假如变为红色）可以写为（MouseEnter事件）：
Button1.Forecolor=color.red;
当鼠标移出，字体颜色变回去（假如本来是黄色）（MouseLeave事件）：
Button1.Forecolor=color.yellow;
如要做高级的动态变化，估计添加timer进来，写Timer的Tick事件，比如Tmier每Tick一次，按钮的红色就加5，同时设置按钮的Tick间距。
vb点虐 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？
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点虐 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
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