Comreak
Nov 15th, 2002, 06:45 PM
I have a question about some program I made while playing with vb.net's drawing functions. Here's the code:
Public Class Form1
Inherits System.Windows.Forms.Form
Dim x As Long, y As Long, z As Long
Dim black As Boolean, red As Boolean
#Region " Windows Form Designer generated code "
Public Sub New()
MyBase.New()
'This call is required by the Windows Form Designer.
InitializeComponent()
'Add any initialization after the InitializeComponent() call
End Sub
'Form overrides dispose to clean up the component list.
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing Then
If Not (components Is Nothing) Then
components.Dispose()
End If
End If
MyBase.Dispose(disposing)
End Sub
'Required by the Windows Form Designer
Private components As System.ComponentModel.IContainer
'NOTE: The following procedure is required by the Windows Form Designer
'It can be modified using the Windows Form Designer.
'Do not modify it using the code editor.
Friend WithEvents PictureBox1 As System.Windows.Forms.PictureBox
Friend WithEvents Button1 As System.Windows.Forms.Button
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.PictureBox1 = New System.Windows.Forms.PictureBox()
Me.Button1 = New System.Windows.Forms.Button()
Me.SuspendLayout()
'
'PictureBox1
'
Me.PictureBox1.Location = New System.Drawing.Point(16, 8)
Me.PictureBox1.Name = "PictureBox1"
Me.PictureBox1.Size = New System.Drawing.Size(280, 280)
Me.PictureBox1.TabIndex = 0
Me.PictureBox1.TabStop = False
'
'Button1
'
Me.Button1.Location = New System.Drawing.Point(112, 296)
Me.Button1.Name = "Button1"
Me.Button1.TabIndex = 1
Me.Button1.Text = "Button1"
'
'Form1
'
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(312, 334)
Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.Button1, Me.PictureBox1})
Me.Name = "Form1"
Me.Text = "Form1"
Me.ResumeLayout(False)
End Sub
#End Region
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
'cycle 1
For z = 0 To 280
x = x + 1
y = y - 1
If black = True Then
PictureBox1.CreateGraphics.DrawLine(System.Drawing.Pens.Black, x, 0, y, 280)
black = False
Else
PictureBox1.CreateGraphics.DrawLine(System.Drawing.Pens.White, x, 0, y, 280)
black = True
End If
Next
x = 0
y = 280
black = True
'cycle 2
For z = 0 To 280
x = x + 1
y = y - 1
If black = True Then
PictureBox1.CreateGraphics.DrawLine(System.Drawing.Pens.Black, 0, x, 280, y)
black = False
Else
PictureBox1.CreateGraphics.DrawLine(System.Drawing.Pens.White, 0, x, 280, y)
black = True
End If
Next
x = 0
y = 280
black = True
End Sub
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
black = True
x = 0
y = 280
End Sub
End Class
I understand what I did here but I don't understand where the strange patterns came from. Run it and you'll see what I mean.
Anyone know why it does this?
Download the attached file if you don't feel like fooling around with the code.
Public Class Form1
Inherits System.Windows.Forms.Form
Dim x As Long, y As Long, z As Long
Dim black As Boolean, red As Boolean
#Region " Windows Form Designer generated code "
Public Sub New()
MyBase.New()
'This call is required by the Windows Form Designer.
InitializeComponent()
'Add any initialization after the InitializeComponent() call
End Sub
'Form overrides dispose to clean up the component list.
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing Then
If Not (components Is Nothing) Then
components.Dispose()
End If
End If
MyBase.Dispose(disposing)
End Sub
'Required by the Windows Form Designer
Private components As System.ComponentModel.IContainer
'NOTE: The following procedure is required by the Windows Form Designer
'It can be modified using the Windows Form Designer.
'Do not modify it using the code editor.
Friend WithEvents PictureBox1 As System.Windows.Forms.PictureBox
Friend WithEvents Button1 As System.Windows.Forms.Button
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.PictureBox1 = New System.Windows.Forms.PictureBox()
Me.Button1 = New System.Windows.Forms.Button()
Me.SuspendLayout()
'
'PictureBox1
'
Me.PictureBox1.Location = New System.Drawing.Point(16, 8)
Me.PictureBox1.Name = "PictureBox1"
Me.PictureBox1.Size = New System.Drawing.Size(280, 280)
Me.PictureBox1.TabIndex = 0
Me.PictureBox1.TabStop = False
'
'Button1
'
Me.Button1.Location = New System.Drawing.Point(112, 296)
Me.Button1.Name = "Button1"
Me.Button1.TabIndex = 1
Me.Button1.Text = "Button1"
'
'Form1
'
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(312, 334)
Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.Button1, Me.PictureBox1})
Me.Name = "Form1"
Me.Text = "Form1"
Me.ResumeLayout(False)
End Sub
#End Region
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
'cycle 1
For z = 0 To 280
x = x + 1
y = y - 1
If black = True Then
PictureBox1.CreateGraphics.DrawLine(System.Drawing.Pens.Black, x, 0, y, 280)
black = False
Else
PictureBox1.CreateGraphics.DrawLine(System.Drawing.Pens.White, x, 0, y, 280)
black = True
End If
Next
x = 0
y = 280
black = True
'cycle 2
For z = 0 To 280
x = x + 1
y = y - 1
If black = True Then
PictureBox1.CreateGraphics.DrawLine(System.Drawing.Pens.Black, 0, x, 280, y)
black = False
Else
PictureBox1.CreateGraphics.DrawLine(System.Drawing.Pens.White, 0, x, 280, y)
black = True
End If
Next
x = 0
y = 280
black = True
End Sub
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
black = True
x = 0
y = 280
End Sub
End Class
I understand what I did here but I don't understand where the strange patterns came from. Run it and you'll see what I mean.
Anyone know why it does this?
Download the attached file if you don't feel like fooling around with the code.