' Sunset Example

' Draw an animated sunset, including sun, sky and grass.

Public Class Form1
    Inherits System.Windows.Forms.Form

#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 MainMenu1 As System.Windows.Forms.MainMenu
    Friend WithEvents mnuStart As System.Windows.Forms.MenuItem
    Friend WithEvents mnuStop As System.Windows.Forms.MenuItem
    Friend WithEvents mnuSpeed As System.Windows.Forms.MenuItem
    Friend WithEvents mnuSlow As System.Windows.Forms.MenuItem
    Friend WithEvents mnuMedium As System.Windows.Forms.MenuItem
    Friend WithEvents mnuFast As System.Windows.Forms.MenuItem
    Friend WithEvents Timer1 As System.Windows.Forms.Timer
    Friend WithEvents picDisplay As System.Windows.Forms.PictureBox
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.components = New System.ComponentModel.Container
        Me.picDisplay = New System.Windows.Forms.PictureBox
        Me.MainMenu1 = New System.Windows.Forms.MainMenu
        Me.mnuStart = New System.Windows.Forms.MenuItem
        Me.mnuStop = New System.Windows.Forms.MenuItem
        Me.mnuSpeed = New System.Windows.Forms.MenuItem
        Me.mnuSlow = New System.Windows.Forms.MenuItem
        Me.mnuMedium = New System.Windows.Forms.MenuItem
        Me.mnuFast = New System.Windows.Forms.MenuItem
        Me.Timer1 = New System.Windows.Forms.Timer(Me.components)
        Me.SuspendLayout()
        '
        'picDisplay
        '
        Me.picDisplay.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle
        Me.picDisplay.Location = New System.Drawing.Point(40, 32)
        Me.picDisplay.Name = "picDisplay"
        Me.picDisplay.Size = New System.Drawing.Size(300, 300)
        Me.picDisplay.TabIndex = 0
        Me.picDisplay.TabStop = False
        '
        'MainMenu1
        '
        Me.MainMenu1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.mnuStart, Me.mnuStop, Me.mnuSpeed})
        '
        'mnuStart
        '
        Me.mnuStart.Index = 0
        Me.mnuStart.Text = "Start"
        '
        'mnuStop
        '
        Me.mnuStop.Index = 1
        Me.mnuStop.Text = "Stop"
        '
        'mnuSpeed
        '
        Me.mnuSpeed.Index = 2
        Me.mnuSpeed.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.mnuSlow, Me.mnuMedium, Me.mnuFast})
        Me.mnuSpeed.Text = "Speed"
        '
        'mnuSlow
        '
        Me.mnuSlow.Index = 0
        Me.mnuSlow.Text = "Slow"
        '
        'mnuMedium
        '
        Me.mnuMedium.Index = 1
        Me.mnuMedium.Text = "Medium"
        '
        'mnuFast
        '
        Me.mnuFast.Index = 2
        Me.mnuFast.Text = "Fast"
        '
        'Timer1
        '
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(376, 366)
        Me.Controls.Add(Me.picDisplay)
        Me.Menu = Me.MainMenu1
        Me.Name = "Form1"
        Me.Text = "Sunset Example"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private sunRadius As Integer = 20
    Private sunPosition As Integer = 50
    Private skyBrightness As Integer = 255
    Private sunBrightness As Integer = 255

    Private Sub picDisplay_Paint(ByVal sender As Object, _
        ByVal e As System.Windows.Forms.PaintEventArgs) Handles picDisplay.Paint

        Dim g As Graphics = e.Graphics
        Dim skyColor As Color = Color.FromArgb( _
            skyBrightness * 0.75, skyBrightness * 0.75, skyBrightness)
        Dim blackPen As New Pen(Color.Black, 2)
        Dim sunBrush As New SolidBrush(Color.FromArgb( _
            127 + sunBrightness * 0.5, sunBrightness, 0))
        Dim grassBrush As New SolidBrush(Color.FromArgb( _
            0, sunBrightness, 0))

        ' Set sky color.
        picDisplay.BackColor = skyColor

        ' Draw sun.
        g.FillEllipse(sunBrush, 230, sunPosition, 2 * sunRadius, 2 * sunRadius)
        g.DrawEllipse(blackPen, 230, sunPosition, 2 * sunRadius, 2 * sunRadius)

        ' Draw grass.
        g.FillRectangle(grassBrush, -3, 200, 310, 110)
        g.DrawRectangle(blackPen, -3, 200, 310, 110)
    End Sub

    Private Sub Timer1_Tick(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles Timer1.Tick

        If sunPosition < 252 Then
            sunPosition += 2
        End If
        If sunBrightness > 4 Then
            sunBrightness -= 4
        End If
        If skyBrightness > 2 Then
            skyBrightness -= 2
        End If
        picDisplay.Invalidate()
    End Sub

    Private Sub mnuStart_Click(ByVal sender As Object, _
    ByVal e As System.EventArgs) Handles mnuStart.Click

        sunPosition = 50
        sunBrightness = 255
        skyBrightness = 255
        Timer1.Enabled = True
    End Sub

    Private Sub mnuStop_Click(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles mnuStop.Click

        Timer1.Enabled = False
    End Sub

    Private Sub mnuSlow_Click(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles mnuSlow.Click

        Timer1.Interval = 100
    End Sub

    Private Sub mnuMedium_Click(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles mnuMedium.Click

        Timer1.Interval = 50
    End Sub

    Private Sub mnuFast_Click(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles mnuFast.Click

        Timer1.Interval = 25
    End Sub
End Class