VB.Net Tutorial/2D Graphics/LinearGradientMode

LinearGradientBrush/LinearGradientMode Illustration

Imports System
Imports System.Drawing
Imports System.Collections
Imports System.ruponentModel
Imports System.Windows.Forms
Imports System.Data
Imports System.Drawing.Drawing2D
public class LinearGradientBrushInComboBox
   public Shared Sub Main
        Application.Run(New Form1)
   End Sub
End class
Public Class Form1
    Inherits System.Windows.Forms.Form
    Private style As New HatchStyle
    Private forClr As Color = Color.Blue
    Private backClr As Color = Color.Red
    Private lgBrush As LinearGradientBrush = Nothing
    Private mode As New LinearGradientMode
    Private startColor As Color = Color.Red
    Private endColor As Color = Color.Green
#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.ruponentModel.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 ComboBox1 As System.Windows.Forms.ruboBox
    Friend WithEvents Label2 As System.Windows.Forms.Label
    Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
    Friend WithEvents Label3 As System.Windows.Forms.Label
    Friend WithEvents TextBox2 As System.Windows.Forms.TextBox
    Friend WithEvents ForColorBtn As System.Windows.Forms.Button
    Friend WithEvents BackGroundBtn As System.Windows.Forms.Button
    Friend WithEvents ApplyBtn As System.Windows.Forms.Button
    Friend WithEvents CheckBox1 As System.Windows.Forms.CheckBox
    Friend WithEvents CheckBox2 As System.Windows.Forms.CheckBox
    Friend WithEvents PrepertiesBtn As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.Label1 = New System.Windows.Forms.Label
        Me.ruboBox1 = New System.Windows.Forms.ruboBox
        Me.Label2 = New System.Windows.Forms.Label
        Me.TextBox1 = New System.Windows.Forms.TextBox
        Me.Label3 = New System.Windows.Forms.Label
        Me.TextBox2 = New System.Windows.Forms.TextBox
        Me.ForColorBtn = New System.Windows.Forms.Button
        Me.BackGroundBtn = New System.Windows.Forms.Button
        Me.ApplyBtn = New System.Windows.Forms.Button
        Me.CheckBox1 = New System.Windows.Forms.CheckBox
        Me.CheckBox2 = New System.Windows.Forms.CheckBox
        Me.PrepertiesBtn = New System.Windows.Forms.Button
        Me.SuspendLayout()
        "
        "Label1
        "
        Me.Label1.Location = New System.Drawing.Point(8, 8)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(72, 23)
        Me.Label1.TabIndex = 0
        Me.Label1.Text = "Select Style:"
        "
        "ComboBox1
        "
        Me.ruboBox1.Location = New System.Drawing.Point(96, 8)
        Me.ruboBox1.Name = "ComboBox1"
        Me.ruboBox1.Size = New System.Drawing.Size(121, 21)
        Me.ruboBox1.TabIndex = 1
        Me.ruboBox1.Text = "ComboBox1"
        "
        "Label2
        "
        Me.Label2.Location = New System.Drawing.Point(8, 40)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(96, 23)
        Me.Label2.TabIndex = 2
        Me.Label2.Text = "Forground Color:"
        "
        "TextBox1
        "
        Me.TextBox1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle
        Me.TextBox1.Location = New System.Drawing.Point(112, 40)
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.ReadOnly = True
        Me.TextBox1.Size = New System.Drawing.Size(32, 20)
        Me.TextBox1.TabIndex = 3
        Me.TextBox1.Text = ""
        "
        "Label3
        "
        Me.Label3.Location = New System.Drawing.Point(0, 72)
        Me.Label3.Name = "Label3"
        Me.Label3.Size = New System.Drawing.Size(104, 23)
        Me.Label3.TabIndex = 4
        Me.Label3.Text = "Background Color:"
        "
        "TextBox2
        "
        Me.TextBox2.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle
        Me.TextBox2.Location = New System.Drawing.Point(112, 72)
        Me.TextBox2.Name = "TextBox2"
        Me.TextBox2.ReadOnly = True
        Me.TextBox2.Size = New System.Drawing.Size(32, 20)
        Me.TextBox2.TabIndex = 5
        Me.TextBox2.Text = ""
        "
        "ForColorBtn
        "
        Me.ForColorBtn.Location = New System.Drawing.Point(152, 40)
        Me.ForColorBtn.Name = "ForColorBtn"
        Me.ForColorBtn.Size = New System.Drawing.Size(48, 23)
        Me.ForColorBtn.TabIndex = 6
        Me.ForColorBtn.Text = "Pick..."
        "
        "BackGroundBtn
        "
        Me.BackGroundBtn.Location = New System.Drawing.Point(152, 72)
        Me.BackGroundBtn.Name = "BackGroundBtn"
        Me.BackGroundBtn.Size = New System.Drawing.Size(48, 23)
        Me.BackGroundBtn.TabIndex = 7
        Me.BackGroundBtn.Text = "Pic..."
        "
        "ApplyBtn
        "
        Me.ApplyBtn.Location = New System.Drawing.Point(224, 64)
        Me.ApplyBtn.Name = "ApplyBtn"
        Me.ApplyBtn.Size = New System.Drawing.Size(96, 32)
        Me.ApplyBtn.TabIndex = 8
        Me.ApplyBtn.Text = "Apply  Settings"
        "
        "CheckBox1
        "
        Me.CheckBox1.Location = New System.Drawing.Point(240, 8)
        Me.CheckBox1.Name = "CheckBox1"
        Me.CheckBox1.Size = New System.Drawing.Size(152, 24)
        Me.CheckBox1.TabIndex = 9
        Me.CheckBox1.Text = "Other Rectangle"
        "
        "CheckBox2
        "
        Me.CheckBox2.Location = New System.Drawing.Point(240, 40)
        Me.CheckBox2.Name = "CheckBox2"
        Me.CheckBox2.Size = New System.Drawing.Size(152, 24)
        Me.CheckBox2.TabIndex = 10
        Me.CheckBox2.Text = "Gamma Correction"
        "
        "PrepertiesBtn
        "
        Me.PrepertiesBtn.Location = New System.Drawing.Point(336, 64)
        Me.PrepertiesBtn.Name = "PrepertiesBtn"
        Me.PrepertiesBtn.Size = New System.Drawing.Size(96, 32)
        Me.PrepertiesBtn.TabIndex = 11
        Me.PrepertiesBtn.Text = "Properties"
        "
        "Form1
        "
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(464, 389)
        Me.Controls.Add(Me.PrepertiesBtn)
        Me.Controls.Add(Me.CheckBox2)
        Me.Controls.Add(Me.CheckBox1)
        Me.Controls.Add(Me.ApplyBtn)
        Me.Controls.Add(Me.TextBox2)
        Me.Controls.Add(Me.Label3)
        Me.Controls.Add(Me.TextBox1)
        Me.Controls.Add(Me.Label2)
        Me.Controls.Add(Me.ruboBox1)
        Me.Controls.Add(Me.Label1)
        Me.Name = "Form1"
        Me.Text = "Hatch Brushes"
        Me.ResumeLayout(False)
    End Sub
#End Region
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        AddGradientMode()
    End Sub
    Private Sub ApplyBtn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ApplyBtn.Click
        Dim g As Graphics = Me.CreateGraphics()
        g.Clear(Me.BackColor)
        Dim str As String = ComboBox1.Text
        Select Case str
            Case "BackwardDiagonal"
                mode = LinearGradientMode.BackwardDiagonal
            Case "ForwardDiagonal"
                mode = LinearGradientMode.ForwardDiagonal
            Case "Horizontal"
                mode = LinearGradientMode.Horizontal
            Case "Vertical"
                mode = LinearGradientMode.Vertical
            Case Else
        End Select
        Dim rect As New Rectangle(50, 140, 200, 220)
        If CheckBox1.Checked Then
            Dim rect1 As New Rectangle(20, 20, 50, 50)
            lgBrush = New LinearGradientBrush(rect1, startColor, endColor, mode)
        Else
            lgBrush = New LinearGradientBrush(rect, startColor, endColor, mode)
        End If
        If CheckBox1.Checked Then
            lgBrush.GammaCorrection = True
        End If
        g.FillRectangle(lgBrush, rect)
        lgBrush.Dispose()
        g.Dispose()
    End Sub
    Private Sub AddGradientMode()
        ComboBox1.Items.Add(LinearGradientMode.BackwardDiagonal)
        ComboBox1.Items.Add(LinearGradientMode.ForwardDiagonal)
        ComboBox1.Items.Add(LinearGradientMode.Horizontal)
        ComboBox1.Items.Add(LinearGradientMode.Vertical)
        ComboBox1.Text = LinearGradientMode.BackwardDiagonal.ToString()
    End Sub "AddGradientMode
    Private Sub PrepertiesBtn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles PrepertiesBtn.Click
        Dim g As Graphics = Me.CreateGraphics()
        Dim pt1 As New Point(40, 30)
        Dim pt2 As New Point(80, 100)
        Dim lnColors As Color() = {Color.Black, Color.Red}
        Dim lgBrush As New LinearGradientBrush(pt1, pt2, Color.Red, Color.Green)
        lgBrush.LinearColors = lnColors
        lgBrush.GammaCorrection = True
        g.FillRectangle(lgBrush, 50, 140, 200, 200)
        lgBrush.Dispose()
        g.Dispose()
    End Sub
End Class

LinearGradientMode.Horizontal

Imports System.Drawing.Text
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class LinearGradientModeHorizontal
   public Shared Sub Main
        Application.Run(New LinearGradientBrushesForm)
   End Sub
End class
Public Class LinearGradientBrushesForm
    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.ruponentModel.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.
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        components = New System.ruponentModel.Container()
        Me.Text = "LinearGradientBrushesForm"
    End Sub
#End Region

    Private Sub LinearGradientBrushesForm_Paint(ByVal sender As Object, ByVal e As PaintEventArgs) Handles MyBase.Paint
        Dim g As Graphics = e.Graphics
        Dim x As Integer = 0
        Dim y As Integer = 0
        Dim width As Integer = Me.ClientRectangle.Width
        Dim height As Integer = Me.ClientRectangle.Height / 4
        Dim blackBrush As Brush = Brushes.Black
        Dim b As LinearGradientBrush = New LinearGradientBrush(Me.ClientRectangle, Color.White, Color.Black, LinearGradientMode.Horizontal)
        g.FillRectangle(b, x, y, width, height)
        g.DrawString("Normal", Me.Font, blackBrush, x, y)
    End Sub
End Class

LinearGradientMode.Vertical

Imports System.Drawing.Text
Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class LinearGradientModeVertical
   public Shared Sub Main
        Application.Run(New LinearGradientBrushesForm)
   End Sub
End class
Public Class LinearGradientBrushesForm
    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.ruponentModel.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.
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        components = New System.ruponentModel.Container()
        Me.Text = "LinearGradientBrushesForm"
    End Sub
#End Region

    Private Sub LinearGradientBrushesForm_Paint(ByVal sender As Object, ByVal e As PaintEventArgs) Handles MyBase.Paint
        Dim g As Graphics = e.Graphics
        Dim x As Integer = 0
        Dim y As Integer = 0
        Dim width As Integer = Me.ClientRectangle.Width
        Dim height As Integer = Me.ClientRectangle.Height / 4
        Dim blackBrush As Brush = Brushes.Black
        Dim b As LinearGradientBrush = New LinearGradientBrush(Me.ClientRectangle, Color.White, Color.Black, LinearGradientMode.Vertical)
        g.FillRectangle(b, x, y, width, height)
        g.DrawString("Normal", Me.Font, blackBrush, x, y)
    End Sub
End Class