Vb.net 不运行Do While循环
我正在编写一个捕食者和猎物的模拟,并建立了一个循环,因此它将始终继续,但由于某种原因,我的程序根本不运行循环。有什么想法吗?是的,我知道我的代码很乱,但我会在以后整理Vb.net 不运行Do While循环,vb.net,loops,Vb.net,Loops,我正在编写一个捕食者和猎物的模拟,并建立了一个循环,因此它将始终继续,但由于某种原因,我的程序根本不运行循环。有什么想法吗?是的,我知道我的代码很乱,但我会在以后整理 Public Class Form1 Dim intWidth As Integer = Screen.PrimaryScreen.Bounds.Width Dim intHeight As Integer = Screen.PrimaryScreen.Bounds.Height Dim StartBase As Integer
Public Class Form1
Dim intWidth As Integer = Screen.PrimaryScreen.Bounds.Width
Dim intHeight As Integer = Screen.PrimaryScreen.Bounds.Height
Dim StartBase As Integer = 10
Dim Hunter(100, 1) As Integer
Dim Hunted(100, 1) As Integer
Dim intCount As Integer = 0
Dim blnFinished As Integer = False
Dim blnFirst As Boolean = True
Private Sub Form1_keydown(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles MyBase.KeyDown
If e.KeyCode = Keys.Escape Then
If MsgBox("Do you want to exit?", MsgBoxStyle.YesNo) = MsgBoxResult.Yes Then
Application.Exit()
End If
End If
End Sub
Private Sub Form1_Load(sender As Object, e As System.EventArgs) Handles Me.Load
Form1_Paint(sender, e)
Do While (blnFinished = False)
Movement()
Form1_Paint(sender, e)
Form1_keydown(sender, e)
Loop
End Sub
Private Sub Form1_Paint(sender As Object, e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
Dim X As Integer = 0
Dim Y As Integer = 0
If blnFirst = True Then
RandomPosition(X, Y)
For Me.intCount = 1 To StartBase
X = CInt(Math.Floor(((intWidth) - 0 + 1) * Rnd())) + 0 'Assigns a random x coordinate
Y = CInt(Math.Floor((intHeight - 250) - 0 + 1) * Rnd()) + 0 'Assigns a random y coordinate
Hunted(intCount, 0) = X
Hunted(intCount, 1) = Y 'Saves the x and y value to Hunted array
e.Graphics.FillRectangle(Brushes.LightGreen, X, Y, 15, 15) 'Draws the hunted to the screen with earlier values
X = CInt(Math.Floor(((intWidth) - 0 + 1) * Rnd())) + 0 'Assigns a random x coordinate
Y = CInt(Math.Floor((intHeight - 250) - 0 + 1) * Rnd()) + 0 'Assigns a random y coordinate
Hunter(intCount, 0) = X
Hunter(intCount, 1) = Y 'Saves the x and y value to Hunted array
e.Graphics.FillRectangle(Brushes.Maroon, X, Y, 15, 15) 'Draws the hunted to the screen with earlier values
Next
blnFirst = False
Else
For Me.intCount = 1 To StartBase
X = Hunted(intCount, 0)
Y = Hunted(intCount, 1)
e.Graphics.FillRectangle(Brushes.LightGreen, X, Y, 15, 15)
X = Hunter(intCount, 0)
Y = Hunter(intCount, 1)
e.Graphics.FillRectangle(Brushes.Maroon, X, Y, 15, 15)
Next
End If
e.Graphics.FillRectangle(Brushes.White, 0, intHeight - 235, intWidth, 200)
End Sub
Private Sub RandomPosition(X, Y)
Randomize()
X = CInt(Math.Floor((Width - 0 + 1) * Rnd())) + 0
Y = CInt(Math.Floor((Height - 250) - 0 + 1) * Rnd()) + 0
End Sub
Private Sub Movement()
End Sub
End Class
您直接调用Form_Paint,并从Form_Load传入sender和e的值。但是,Form_Paint希望e的类型为System.Windows.Forms.PaintEventArgs,而您正在传入System.EventArgs类型的对象,因为这是传递到Form_Load中的对象。System.EventArgs没有名为Graphics的属性。因此,下面这行以及其他类似的行可能会引发异常,因为传入的e值没有图形属性:
e.Graphics.FillRectangle(Brushes.LightGreen, X, Y, 15, 15)
我认为您没有看到异常,因为它发生在表单加载中。在调试模式下运行程序并查看输出窗口。这里可能显示了例外情况。或者在代码周围放一个Try-Catch
您最好使用计时器,并在它的tick事件中调用Form1.Refresh。这将正确触发绘制事件 将blnFinished的类型更改为boolean。现在有了隐式类型转换。打开选项Strict并修复它将抛出的错误…直接调用事件处理程序Form_paint,Form_KeyDown是设计不佳的标志。您不应该直接调用这些方法,也不应该在Form_Load中调用。