' Project RealEstate, source code file Form1.vb.

' Display information about houses graphically in a picture box.
' If user wants more information, clicking on a house brings up
' a secondary window with more information.

Imports System.Data.OleDb

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 Label1 As System.Windows.Forms.Label
    Friend WithEvents Label2 As System.Windows.Forms.Label
    Friend WithEvents MainMenu1 As System.Windows.Forms.MainMenu
    Friend WithEvents mnuPlot As System.Windows.Forms.MenuItem
    Friend WithEvents picDisplay As System.Windows.Forms.PictureBox
    Friend WithEvents trkMin As System.Windows.Forms.TrackBar
    Friend WithEvents trkMax As System.Windows.Forms.TrackBar
    Friend WithEvents Label3 As System.Windows.Forms.Label
    Friend WithEvents Label4 As System.Windows.Forms.Label
    Friend WithEvents txtMin As System.Windows.Forms.TextBox
    Friend WithEvents txtMax As System.Windows.Forms.TextBox
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.trkMin = New System.Windows.Forms.TrackBar
        Me.Label1 = New System.Windows.Forms.Label
        Me.Label2 = New System.Windows.Forms.Label
        Me.picDisplay = New System.Windows.Forms.PictureBox
        Me.MainMenu1 = New System.Windows.Forms.MainMenu
        Me.mnuPlot = New System.Windows.Forms.MenuItem
        Me.trkMax = New System.Windows.Forms.TrackBar
        Me.Label3 = New System.Windows.Forms.Label
        Me.Label4 = New System.Windows.Forms.Label
        Me.txtMin = New System.Windows.Forms.TextBox
        Me.txtMax = New System.Windows.Forms.TextBox
        CType(Me.trkMin, System.ComponentModel.ISupportInitialize).BeginInit()
        CType(Me.trkMax, System.ComponentModel.ISupportInitialize).BeginInit()
        Me.SuspendLayout()
        '
        'trkMin
        '
        Me.trkMin.Location = New System.Drawing.Point(16, 48)
        Me.trkMin.Maximum = 750
        Me.trkMin.Minimum = 50
        Me.trkMin.Name = "trkMin"
        Me.trkMin.Orientation = System.Windows.Forms.Orientation.Vertical
        Me.trkMin.Size = New System.Drawing.Size(45, 360)
        Me.trkMin.TabIndex = 0
        Me.trkMin.TickFrequency = 50
        Me.trkMin.Value = 50
        '
        'Label1
        '
        Me.Label1.Font = New System.Drawing.Font("Microsoft Sans Serif", 12.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label1.Location = New System.Drawing.Point(120, 48)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(80, 24)
        Me.Label1.TabIndex = 2
        Me.Label1.Text = "$750,000"
        '
        'Label2
        '
        Me.Label2.Font = New System.Drawing.Font("Microsoft Sans Serif", 12.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label2.Location = New System.Drawing.Point(120, 384)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(80, 24)
        Me.Label2.TabIndex = 3
        Me.Label2.Text = "$50,000"
        '
        'picDisplay
        '
        Me.picDisplay.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle
        Me.picDisplay.Location = New System.Drawing.Point(136, 80)
        Me.picDisplay.Name = "picDisplay"
        Me.picDisplay.Size = New System.Drawing.Size(352, 296)
        Me.picDisplay.TabIndex = 4
        Me.picDisplay.TabStop = False
        '
        'MainMenu1
        '
        Me.MainMenu1.MenuItems.AddRange(New System.Windows.Forms.MenuItem() {Me.mnuPlot})
        '
        'mnuPlot
        '
        Me.mnuPlot.Index = 0
        Me.mnuPlot.Text = "Plot Houses"
        '
        'trkMax
        '
        Me.trkMax.Location = New System.Drawing.Point(72, 48)
        Me.trkMax.Maximum = 750
        Me.trkMax.Minimum = 50
        Me.trkMax.Name = "trkMax"
        Me.trkMax.Orientation = System.Windows.Forms.Orientation.Vertical
        Me.trkMax.Size = New System.Drawing.Size(45, 360)
        Me.trkMax.TabIndex = 5
        Me.trkMax.TickFrequency = 50
        Me.trkMax.Value = 750
        '
        'Label3
        '
        Me.Label3.Font = New System.Drawing.Font("Microsoft Sans Serif", 12.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label3.Location = New System.Drawing.Point(8, 16)
        Me.Label3.Name = "Label3"
        Me.Label3.Size = New System.Drawing.Size(40, 24)
        Me.Label3.TabIndex = 6
        Me.Label3.Text = "Min"
        '
        'Label4
        '
        Me.Label4.Font = New System.Drawing.Font("Microsoft Sans Serif", 12.0!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
        Me.Label4.Location = New System.Drawing.Point(64, 16)
        Me.Label4.Name = "Label4"
        Me.Label4.Size = New System.Drawing.Size(40, 24)
        Me.Label4.TabIndex = 7
        Me.Label4.Text = "Max"
        '
        'txtMin
        '
        Me.txtMin.Location = New System.Drawing.Point(8, 408)
        Me.txtMin.Name = "txtMin"
        Me.txtMin.Size = New System.Drawing.Size(32, 20)
        Me.txtMin.TabIndex = 8
        Me.txtMin.Text = ""
        Me.txtMin.TextAlign = System.Windows.Forms.HorizontalAlignment.Right
        '
        'txtMax
        '
        Me.txtMax.Location = New System.Drawing.Point(64, 408)
        Me.txtMax.Name = "txtMax"
        Me.txtMax.Size = New System.Drawing.Size(32, 20)
        Me.txtMax.TabIndex = 9
        Me.txtMax.Text = ""
        Me.txtMax.TextAlign = System.Windows.Forms.HorizontalAlignment.Right
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(544, 473)
        Me.Controls.Add(Me.txtMax)
        Me.Controls.Add(Me.txtMin)
        Me.Controls.Add(Me.Label4)
        Me.Controls.Add(Me.Label3)
        Me.Controls.Add(Me.trkMax)
        Me.Controls.Add(Me.picDisplay)
        Me.Controls.Add(Me.Label2)
        Me.Controls.Add(Me.Label1)
        Me.Controls.Add(Me.trkMin)
        Me.Menu = Me.MainMenu1
        Me.Name = "Form1"
        Me.Text = "RealEstate Example"
        CType(Me.trkMin, System.ComponentModel.ISupportInitialize).EndInit()
        CType(Me.trkMax, System.ComponentModel.ISupportInitialize).EndInit()
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private c As OleDbConnection
    Private sc As OleDbCommand
    Private dr As OleDbDataReader
    Private rivers As New ArrayList
    Private houses As New ArrayList
    Private houseForm As New frmHouse

    Private Sub Form1_Load(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles MyBase.Load

        c = New OleDbConnection
        c.ConnectionString = ""
        c.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;" & _
            "Data Source=c:\RealEstate.mdb"
        c.Open()

        sc = c.CreateCommand()
        sc.CommandType = CommandType.Text
        sc.CommandText = "SELECT * FROM Rivers"

        dr = sc.ExecuteReader()
        While dr.Read()
            rivers.Add(New RiverPoint(dr.GetFloat(0), _
                dr.GetFloat(1), dr.GetBoolean(2)))
        End While
        dr.Close()

        txtMin.Text = trkMin.Value
        txtMax.Text = trkMax.Value
    End Sub


    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 p As New Pen(Color.Blue, 3)
        Dim br As New SolidBrush(Color.Red)
        Dim r As RiverPoint
        Dim h As HousePoint
        Dim xprev, yprev As Single

        For Each r In rivers
            If r.StartPoint Then
                g.DrawLine(p, 10 * r.X, 10 * r.Y, 10 * r.X, 10 * r.Y)
            Else
                g.DrawLine(p, 10 * xprev, 10 * yprev, 10 * r.X, 10 * r.Y)
            End If
            xprev = r.X
            yprev = r.Y
        Next

        For Each h In houses
            g.FillEllipse(br, 10 * h.X - 3, 10 * h.Y - 3, 6, 6)
        Next
    End Sub

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

        Dim minPrice, maxPrice As Double
        minPrice = 1000 * trkMin.Value
        maxPrice = 1000 * trkMax.Value

        sc.CommandType = CommandType.Text
        sc.CommandText = "SELECT * FROM Houses WHERE " & _
            minPrice & " < Price And Price < " & maxPrice
        dr = sc.ExecuteReader()

        houses.Clear()
        While dr.Read()
            houses.Add(New HousePoint(dr.GetFloat(1), dr.GetFloat(2), dr.GetInt32(0)))
        End While
        dr.Close()
        picDisplay.Invalidate()
    End Sub

    Private Sub trkMin_Scroll(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles trkMin.Scroll

        txtMin.Text = trkMin.Value
    End Sub

    Private Sub trkMax_Scroll(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles trkMax.Scroll

        txtMax.Text = trkMax.Value
    End Sub

    Private Sub picDisplay_MouseUp(ByVal sender As Object, _
        ByVal e As System.Windows.Forms.MouseEventArgs) Handles picDisplay.MouseUp

        Dim h As HousePoint
        For Each h In houses
            If Math.Abs(e.X - 10 * h.X) < 3 And Math.Abs(e.Y - 10 * h.Y) < 3 Then
                DisplayHouse(h.ID)
            End If
        Next
    End Sub

    Private Sub DisplayHouse(ByVal theID As Integer)
        Dim price As Double

        sc.CommandText = "SELECT * FROM Houses WHERE ID = " & theID
        dr = sc.ExecuteReader
        If dr.Read Then
            houseForm.txtAddress.Text = dr.GetString(3)
            houseForm.txtCity.Text = dr.GetString(4)
            houseForm.txtBedrooms.Text = dr.GetFloat(5)
            houseForm.txtBathrooms.Text = dr.GetFloat(6)
            price = dr.GetDecimal(8)
            houseForm.txtPrice.Text = price.ToString("$#,##0.")
        End If
        houseForm.ShowDialog()
        dr.Close()
    End Sub
End Class