VB.Net Tutorial/2D Graphics/LinearGradientMode
LinearGradientBrush/LinearGradientMode Illustration
<source lang="vbnet">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</source>
LinearGradientMode.Horizontal
<source lang="vbnet">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</source>
LinearGradientMode.Vertical
<source lang="vbnet">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</source>
