Fun with graphics

[grilkip]

Ok, I'd like y'all to check this out, it doesn't teach anything about GDI+ but it's fun to look at.

You need a project with a Form with a button (Button1)

when you've started the prog, click the form and move the mouse around. (StepZ is controlled by the mousewheel)

Public Class Form1
    Inherits System.Windows.Forms.Form
 
    '###
    ' Windows Form Designer generated code 
    '###
 
    Private TheTimer As Timer
    Private BM1 As New Bitmap(100, 100)
    Private fgr As Graphics = Me.CreateGraphics
 
    Private StepX As Double = 16 ^ -1
    Private StepY As Double = 12 ^ -1
    Private StepZ As Double = 8 ^ -1
 
 
    Private Sub Button1_Click(ByVal sender As System.Object, _
                           ByVal e As System.EventArgs) Handles Button1.Click
        If TheTimer Is Nothing Then
            UpdateInfo()
            TheTimer = New Timer
            TheTimer.Interval = 50
            AddHandler TheTimer.Tick, AddressOf Draw
            TheTimer.Enabled = True
        Else
            TheTimer.Enabled = Not TheTimer.Enabled
        End If
    End Sub
 
    Private Sub Draw(ByVal Sender As Object, ByVal e As System.EventArgs)
        Static OffsetX As Double = 0
        Static OffsetY As Double = 0
        Static OffsetZ As Double = 0
        Static z As Integer = 0
 
        Dim y As Integer
        Dim xred As Integer
        Dim ygreen As Integer
        Dim zblue As Integer = CInt((1 + Math.Sin(OffsetZ + z / BM1.Width * 2 * Math.PI)) * 127)
 
        For x As Integer = 0 To BM1.Width - 1
            xred = CInt((1 + Math.Sin(OffsetX + x / BM1.Width * 2 * Math.PI)) * 127)
 
            For y = 0 To BM1.Height - 1
                ygreen = CInt((1 + Math.Sin(OffsetY + y / BM1.Height * 2 * Math.PI)) * 127)
                BM1.SetPixel(x, y, Color.FromArgb(xred, ygreen, zblue))
 
            Next y
        Next x
 
        fgr.DrawImage(BM1, 0, 0, 600, 600)
 
        OffsetX += 2 * Math.PI * StepX
        If OffsetX > 2 * Math.PI Then OffsetX -= 2 * Math.PI
        OffsetY += 2 * Math.PI * StepY
        If OffsetY > 2 * Math.PI Then OffsetY -= 2 * Math.PI
        OffsetZ += 2 * Math.PI * StepZ
        If OffsetZ > 2 * Math.PI Then OffsetZ -= 2 * Math.PI
    End Sub
 
    Private Sub Form1_MouseMove(ByVal sender As Object, _
                                              ByVal e As System.Windows.Forms.MouseEventArgs) _
                                                  Handles MyBase.MouseMove
        Const MaxStep As Double = 1 / 10
        If e.Button = MouseButtons.Left Then
            StepX = (1 + 2 * (e.X - Me.Width) / Me.Width) * MaxStep
            StepY = (1 + 2 * (e.Y - Me.Width) / Me.Width) * MaxStep
            UpdateInfo()
        End If
    End Sub
 
    Private Sub UpdateInfo()
        Me.Text = "StepX:" & StepX.ToString("0.###") & _
                  " StepY:" & StepY.ToString("0.###") & _
                  " StepZ:" & StepZ.ToString("0.###")
    End Sub
 
    Private Sub Form1_MouseWheel(ByVal sender As Object, _
                                 ByVal e As System.Windows.Forms.MouseEventArgs) _
                                 Handles MyBase.MouseWheel
 
        If Not e.Delta.Equals(0) Then
            Select Case e.Delta > 0
                Case True
                    StepZ += 0.005
                    If StepZ > 0.1 Then StepZ = 0.1
                Case False
                    StepZ -= 0.005
                    If StepZ < -0.1 Then StepZ = -0.1
            End Select
            UpdateInfo()
        End If
 
    End Sub
End Class