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vb.net - 导致纯白色按钮的图形

问题描述

我正在编写康威的人生游戏。我的网格完全在图片框中，但是当我加载表单时，右上角的后退按钮完全是白色的。刷新表单会修复按钮，但会使其非常滞后。每个其他按钮都显示得很好，只是后退按钮坏了。我怎样才能解决这个问题？

Option Strict On

Public Class frmGame
    ' Declaring public variables
    Public bmp As Bitmap
    Public G As Graphics
    Public WithEvents speed As Timer
    Public grid(50, 40) As Boolean
    Public input(50, 40) As Boolean
    Public intGens As Integer = 0
    Public change As Boolean = False
    Public P As New Pen(Color.Black)
Private Sub picGrid_Paint(sender As Object, e As PaintEventArgs) Handles picGrid.Paint
    ' Loads bitmap, graphics, etc and prepares to begin simulation

    ' Creates graphics device
    bmp = New Bitmap(600, 480)[enter image description here][1]
    picGrid.Image = bmp
    G = Graphics.FromImage(bmp)

    ' Defining variables for grid
    Dim x As Integer = 0
    Dim y As Integer = 0

    ' Draws grid
    For y = 0 To 480
        For x = 0 To 600
            G.DrawRectangle(pen:=P, x:=x, y:=y, width:=12, height:=12)
            x += 12
        Next
        x = 0
        y += 12
    Next
End Sub

Private Sub btnBack_Click(sender As Object, e As EventArgs) Handles btnBack.Click
    ' Hides rules form, shows main menu form
    frmMainMenu.Show()
    Me.Hide()

End Sub

Private Sub frmGame_FormClosed(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosedEventArgs) Handles Me.FormClosed
    ' Frees memory when form is closed
    G.Dispose()
    bmp.Dispose()
    speed.Dispose()

End Sub
End Class

标签： vb.net

解决方案

我不确定我是否理解您的问题，也不能使用提供的代码重新创建它。但我可以推荐一些可以帮助你的东西。

首先，在处理绘图时不要使用 Control.Refresh()，而是使用 Control.Invalidate() 和 Control.Update()，这可能会解决滞后问题。

您是否需要 2 个表格（我理解这是问题的根源）？不要隐藏表单，而是隐藏 PictureBox (.Visible = False) 并显示您当时需要的其他控件。

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