VB.Net Tutorial/2D Graphics/TextureBrush — различия между версиями

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Текущая версия на 15:54, 26 мая 2010

Create TextureBrush from Bitmap

<source lang="vbnet">Imports System Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Collections Imports System.ruponentModel Imports System.Windows.Forms Imports System.Data public class TextureBrushCreateFromBitmap

  public Shared Sub Main
       Application.Run(New BrushesForm)
  End Sub

End class Public Class BrushesForm

   Inherits System.Windows.Forms.Form
  1. 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()
       "
       "BrushesForm
       "
       Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
       Me.ClientSize = New System.Drawing.Size(292, 266)
       Me.Name = "BrushesForm"
       Me.Text = "Form1"
   End Sub
  1. End Region
   Enum LinearGradientMode
       BackwardDiagonal
       ForwardDiagonal
       Horizontal
       Vertical
   End Enum
   Private Sub BrushesForm_Paint(ByVal sender As Object, ByVal e As PaintEventArgs) Handles MyBase.Paint
       Dim g As Graphics = e.Graphics
       Dim width As Integer = Me.ClientRectangle.Width
       Dim height As Integer = Me.ClientRectangle.Height / 5
       Dim whiteBrush As Brush = System.Drawing.Brushes.White
       Dim blackBrush As Brush = System.Drawing.Brushes.Black
       Dim b As Brush
       Dim file As String = "YourFile.jpg"
       b = New TextureBrush(New Bitmap(file))
       g.FillRectangle(b, 0, 0, width, height)
       g.DrawString(b.ToString(), Me.Font, whiteBrush, 0, 0)
   End Sub

End Class</source>

Create textured brush and display textured rectangle

<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms public class TexturePaintDemo

  public Shared Sub Main
       Application.Run(New FrmDrawShapes)
  End Sub

End class Public Class FrmDrawShapes

  Inherits System.Windows.Forms.Form
  1. 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.Container
  "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()
     "
     "frmDrawShapes
     "
     Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
     Me.ClientSize = New System.Drawing.Size(520, 197)
     Me.Name = "frmDrawShapes"
     Me.Text = "Drawing Shapes"
  End Sub
  1. End Region
  Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
     Dim graphicsObject As Graphics = e.Graphics
     Dim textureBitmap As Bitmap = New Bitmap(10, 10)
     Dim graphicsObject2 As Graphics = Graphics.FromImage(textureBitmap) " get bitmap graphics
     " brush and pen used throughout program
     Dim solidColorBrush As SolidBrush = New SolidBrush(Color.Red)
     Dim coloredPen As Pen = New Pen(solidColorBrush)
     solidColorBrush.Color = Color.Yellow
     graphicsObject2.FillRectangle(solidColorBrush, 0, 0, 10, 10)
     coloredPen.Color = Color.Black
     graphicsObject2.DrawRectangle(coloredPen, 1, 1, 6, 6)
     solidColorBrush.Color = Color.Blue
     graphicsObject2.FillRectangle(solidColorBrush, 1, 1, 3, 3)
     solidColorBrush.Color = Color.Red
     graphicsObject2.FillRectangle(solidColorBrush, 4, 4, 3, 3)
     
     Dim texturedBrush As TextureBrush = _
        New TextureBrush(textureBitmap)
     graphicsObject.FillRectangle(texturedBrush, 155, 30, 75, 100)
  End Sub 

End Class</source>

Generate points to draw a star shape

<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms Imports System.Math public class DrawAStarShape

  public Shared Sub Main
       Application.Run(New Form1)
  End Sub

End class public class Form1

 Inherits System.Windows.Forms.Form
 Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
       "
       Dim cx As Integer = Me.ClientSize.Width \ 2
       Dim cy As Integer = Me.ClientSize.Height \ 2
       Dim r1 As Integer = Min(cx, cy) - 10
       Dim r2 As Integer = Min(cx, cy) \ 2
       Dim pts(9) As Point
       For i As Integer = 0 To 9 Step 2
           pts(i).X = cx + CInt(r1 * Cos(i * PI / 5 - PI / 2))
           pts(i).Y = cy + CInt(r1 * Sin(i * PI / 5 - PI / 2))
           pts(i + 1).X = cx + CInt(r2 * Cos((i + 1) * PI / 5 - PI / 2))
           pts(i + 1).Y = cy + CInt(r2 * Sin((i + 1) * PI / 5 - PI / 2))
       Next i
       Dim texture_brush As New TextureBrush(new Bitmap("yourfile.jpg"))
       e.Graphics.FillPolygon(texture_brush, pts)
       e.Graphics.DrawPolygon(Pens.Black, pts)
 End Sub
 Public Sub New()
  
   MyBase.New()
   Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
   Me.ClientSize = New System.Drawing.Size(292, 273)
   Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
 End Sub

End Class</source>

Transform and Rotate the TextureBrush

<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms Imports System.Math public class TextureBrushTransformAndRotate

  public Shared Sub Main
       Application.Run(New Form1)
  End Sub

End class public class Form1

 Inherits System.Windows.Forms.Form
 Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
       " .
       Dim cx As Integer = Me.ClientSize.Width \ 2
       Dim cy As Integer = Me.ClientSize.Height \ 2
       Dim r1 As Integer = Min(cx, cy) - 10
       Dim r2 As Integer = Min(cx, cy) \ 2
       Dim pts(9) As Point
       For i As Integer = 0 To 9 Step 2
           pts(i).X = cx + CInt(r1 * Cos(i * PI / 5 - PI / 2))
           pts(i).Y = cy + CInt(r1 * Sin(i * PI / 5 - PI / 2))
           pts(i + 1).X = cx + CInt(r2 * Cos((i + 1) * PI / 5 - PI / 2))
           pts(i + 1).Y = cy + CInt(r2 * Sin((i + 1) * PI / 5 - PI / 2))
       Next i
       Dim texture_brush As New TextureBrush(new Bitmap("yourfile.jpg"))
       texture_brush.ScaleTransform(20, 10, MatrixOrder.Append)
       texture_brush.RotateTransform(30, MatrixOrder.Append)
       e.Graphics.FillPolygon(texture_brush, pts)
       e.Graphics.DrawPolygon(Pens.Black, pts)
 End Sub
 Public Sub New()
  
   MyBase.New()
   Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
   Me.ClientSize = New System.Drawing.Size(292, 273)
   Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
 End Sub

End Class</source>

Transform TextureBrush

<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms public class TransformTextureBrush

  public Shared Sub Main
       Application.Run(New Form1)
  End Sub

End class public class Form1

 Inherits System.Windows.Forms.Form
 Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
       Dim g As Graphics = Me.CreateGraphics()
       g.Clear(Me.BackColor)
       " Create a TextureBrush object
       Dim txtrBrush As New TextureBrush(New Bitmap("yourfile.jpg"))
       " Create a transformation matrix.
       Dim M As New Matrix
       " Rotate the texture image by 90 degrees.
       txtrBrush.RotateTransform(90, MatrixOrder.Prepend)
       " Translate
       M.Translate(50, 0)
       " Multiply the transformation matrix
       " of tBrush by translateMatrix.
       txtrBrush.MultiplyTransform(M)
       " Scale operation
       txtrBrush.ScaleTransform(2, 1, MatrixOrder.Prepend)
       " Fill a rectangle with texture brush
       g.FillRectangle(txtrBrush, 240, 0, 200, 200)
       " Reset transformation
       txtrBrush.ResetTransform()
       " Fill rectangle after reseting transformation
       g.FillRectangle(txtrBrush, 0, 0, 200, 200)
       " Dispose
       txtrBrush.Dispose()
       g.Dispose()
 End Sub
 Public Sub New()
  
   MyBase.New()
   Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
   Me.ClientSize = New System.Drawing.Size(292, 273)
   Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
 End Sub

End Class</source>