в 16:40, 26 мая 2010

2010-05-26T16:40:30Z

Admin: 1 версия

2010-05-26T12:54:55Z

1 версия

Новая страница

==Draw to the form indirectly through a bitmap==

<source lang="vbnet">Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
public class DrawImageIndirectly
public Shared Sub Main
Application.Run(New Form1)
End Sub
End class
Public Class Form1
Private Sub Form1_Paint(ByVal sender As Object, _
ByVal e As System.Windows.Forms.PaintEventArgs) _
Handles Me.Paint

Dim x As Single
Dim y As Single
Dim xCenter As Single
Dim yCenter As Single
Dim angle As Single
Dim radians As Single
Dim workImage As Bitmap
Dim canvas As Graphics
workImage = New Bitmap(Me.Size.Width, Me.Size.Height,e.Graphics)
canvas = Graphics.FromImage(workImage)
For angle = 0 To 360 Step 2
radians = angle * Math.PI / 180
x = 500 * Math.Cos(radians)
y = 500 * Math.Sin(radians)
yCenter = Me.ClientSize.Height / 2
xCenter = Me.ClientSize.Width * 10 / 21
canvas.DrawLine(Pens.Black, xCenter, yCenter, xCenter + x, yCenter + y)
xCenter = Me.ClientSize.Width * 11 / 21
canvas.DrawLine(Pens.Black, xCenter, yCenter, xCenter + x, yCenter + y)
Next angle
e.Graphics.DrawImage(workImage, 0, 0)
End Sub
Private Sub Form1_Resize(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Resize
Me.Invalidate()
End Sub
End Class

<Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _
Partial Class Form1
Inherits System.Windows.Forms.Form
"Form overrides dispose to clean up the component list.
<System.Diagnostics.DebuggerNonUserCode()> _
Protected Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing AndAlso components IsNot Nothing Then
components.Dispose()
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()
Me.SuspendLayout()
"
"Form1
"
Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
Me.ClientSize = New System.Drawing.Size(430, 419)
Me.DoubleBuffered = True
Me.Name = "Form1"
Me.Text = "Creating a Bitmap"
Me.ResumeLayout(False)
End Sub
End Class</source>

==Use Bitmap to buffer paint==

<source lang="vbnet">Imports System.Drawing
Imports System.Drawing.Drawing2D
Imports System.Windows.Forms
Imports System.Math
Imports System.Drawing.Imaging

public class Bufferring
public Shared Sub Main
Application.Run(New Form1)
End Sub
End class
Public Class Form1
Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) _
Handles MyBase.Load
DrawDiamond()
End Sub
Private Sub Form1_Resize(ByVal sender As Object, ByVal e As System.EventArgs) _
Handles MyBase.Resize
DrawDiamond()
End Sub
Private Sub DrawDiamond()
Dim wid As Integer = picCanvas.ClientSize.Width
Dim hgt As Integer = picCanvas.ClientSize.Height
If wid < 1 Or hgt < 1 Then Exit Sub
Dim bm As New Bitmap(wid, hgt)
Dim gr As Graphics = Graphics.FromImage(bm)
Dim bg_brush As New HatchBrush(HatchStyle.HorizontalBrick, Color.Blue, Color.Aqua)
gr.FillRectangle(bg_brush, picCanvas.ClientRectangle)
Dim pts() As Point = {New Point(wid \ 2, 0),New Point(wid, hgt \ 2), _
New Point(wid \ 2, hgt),New Point(0, hgt \ 2) }
gr.FillPolygon(Brushes.White, pts)
gr.DrawPolygon(Pens.Black, pts)
picCanvas.Image = bm
bg_brush.Dispose()
gr.Dispose()
End Sub
End Class

<Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _
Partial Public Class Form1
Inherits System.Windows.Forms.Form
"Form overrides dispose to clean up the component list.
<System.Diagnostics.DebuggerNonUserCode()> _
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing AndAlso components IsNot Nothing Then
components.Dispose()
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()
Me.picCanvas = New System.Windows.Forms.PictureBox
CType(Me.picCanvas, System.ruponentModel.ISupportInitialize).BeginInit()
Me.SuspendLayout()
"
"picCanvas
"
Me.picCanvas.Dock = System.Windows.Forms.DockStyle.Fill
Me.picCanvas.Location = New System.Drawing.Point(0, 0)
Me.picCanvas.Name = "picCanvas"
Me.picCanvas.Size = New System.Drawing.Size(292, 273)
Me.picCanvas.TabIndex = 0
Me.picCanvas.TabStop = False
"
"Form1
"
Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
Me.ClientSize = New System.Drawing.Size(292, 273)
Me.Controls.Add(Me.picCanvas)
Me.Name = "Form1"
Me.Text = "AutoRedraw"
CType(Me.picCanvas, System.ruponentModel.ISupportInitialize).EndInit()
Me.ResumeLayout(False)
End Sub
Friend WithEvents picCanvas As System.Windows.Forms.PictureBox
End Class</source>

← Предыдущая	Версия 16:40, 26 мая 2010
(нет различий)

VB.Net Tutorial/2D Graphics/Paint Buffer - История изменений

в 16:40, 26 мая 2010

Admin: 1 версия