VB.Net Tutorial/2D Graphics/Curve
Содержание
Draw Closed Curve
<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms public class DrawClosedCurve
public Shared Sub Main
Application.Run(New FillModesForm)
End Sub
End class
Public Class FillModesForm
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 = "FillModesForm"
End Sub
- End Region
Private Sub FillModesForm_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 / 2
Dim height As Integer = Me.ClientRectangle.Height
Dim fillBrush As Brush = Brushes.Gray
Dim pen As Pen = New Pen(Color.Red, 4)
Dim pointPen As Pen = New Pen(Color.Black, 3)
pointPen.StartCap = pointPen.EndCap = LineCap.SquareAnchor
Dim points As PointF() = New PointF() {New PointF(x + 25, y + height - 25), New PointF(x + width - 25, y + height - 25), New PointF(x + 25, height / 2), New PointF(x + width - 25, y + 25), New PointF(x + 25, y + 25), New PointF(x + width - 25, height / 2)}
g.DrawClosedCurve(pen, points)
End Sub
End Class</source>
Draw curve
<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms public class DrawCurve
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 a As Graphics = e.Graphics
Dim mypen As Pen
Dim mypoints(21) As PointF
Dim i As Integer
mypen = New Pen(System.Drawing.Color.Red, 3)
For i = 0 To 9
mypoints(i).X = 10 * i
mypoints(i).Y = i * i * 3
Next
For i = 10 To 20
mypoints(i).X = 10 * i
mypoints(i).Y = (200 + i * i) / 15
Next
a = Me.CreateGraphics
a.Clear(Me.BackColor)
a.DrawCurve(mypen, mypoints)
a.Dispose()
mypen.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>
Draw curve with Tension setting
<source lang="vbnet">Imports System.Collections Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms public class DrawCurveTension
public Shared Sub Main
Application.Run(New Form1)
End Sub
End class Public Class Form1
Private BendPoints As New Generic.List(Of Point)
Private Sub Form1_MouseClick(ByVal sender As Object,ByVal e As System.Windows.Forms.MouseEventArgs) Handles Me.MouseClick
BendPoints.Add(New Point(e.X, e.Y))
Me.Refresh()
End Sub
Private Sub Form1_Paint(ByVal sender As Object, _
ByVal e As System.Windows.Forms.PaintEventArgs) _
Handles Me.Paint
Dim tension As Single
Dim canvas As Graphics
Dim scanPoint As Point
Const PointSize As Integer = 2
tension = TensionLevel.Value / TensionLevel.Maximum
LabelTension.Text = "Tension: " & tension.ToString
canvas = e.Graphics
For Each scanPoint In BendPoints
canvas.FillEllipse(Brushes.Red,scanPoint.X - PointSize,scanPoint.Y - PointSize,PointSize * 2, PointSize * 2)
Next scanPoint
If (BendPoints.Count > 1) Then
canvas.DrawCurve(Pens.Black, BendPoints.ToArray, tension)
End If
End Sub
Private Sub TensionLevel_ValueChanged(ByVal sender As Object, ByVal e As System.EventArgs) _
Handles TensionLevel.ValueChanged
Me.Refresh()
End Sub
Private Sub ActReset_Click(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles ActReset.Click
BendPoints.Clear()
Me.Refresh()
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.LabelTension = New System.Windows.Forms.Label
Me.TensionLevel = New System.Windows.Forms.TrackBar
Me.ActReset = New System.Windows.Forms.Button
CType(Me.TensionLevel, System.ruponentModel.ISupportInitialize).BeginInit()
Me.SuspendLayout()
"
"LabelTension
"
Me.LabelTension.AutoSize = True
Me.LabelTension.Location = New System.Drawing.Point(24, 32)
Me.LabelTension.Name = "LabelTension"
Me.LabelTension.Size = New System.Drawing.Size(66, 13)
Me.LabelTension.TabIndex = 0
Me.LabelTension.Text = "Tension: 0.0"
"
"TensionLevel
"
Me.TensionLevel.Location = New System.Drawing.Point(136, 24)
Me.TensionLevel.Name = "TensionLevel"
Me.TensionLevel.Size = New System.Drawing.Size(224, 45)
Me.TensionLevel.TabIndex = 1
"
"ActReset
"
Me.ActReset.Location = New System.Drawing.Point(392, 24)
Me.ActReset.Name = "ActReset"
Me.ActReset.Size = New System.Drawing.Size(75, 23)
Me.ActReset.TabIndex = 2
Me.ActReset.Text = "Reset"
Me.ActReset.UseVisualStyleBackColor = True
"
"Form1
"
Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
Me.ClientSize = New System.Drawing.Size(547, 264)
Me.Controls.Add(Me.ActReset)
Me.Controls.Add(Me.TensionLevel)
Me.Controls.Add(Me.LabelTension)
Me.Name = "Form1"
Me.Text = "Drawing Cardinal Splines"
CType(Me.TensionLevel, System.ruponentModel.ISupportInitialize).EndInit()
Me.ResumeLayout(False)
Me.PerformLayout()
End Sub
Friend WithEvents LabelTension As System.Windows.Forms.Label
Friend WithEvents TensionLevel As System.Windows.Forms.TrackBar
Friend WithEvents ActReset As System.Windows.Forms.Button
End Class</source>
Draw Sin curve
<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms Imports System.Math public class DrawCurveSin
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 a As Graphics = e.Graphics
Dim mypen As Pen
Dim mypoints() As PointF
Dim i As Integer
Dim mycount As Integer
mypen = New Pen(System.Drawing.Color.Red, 3)
mycount = Me.Width / 10
ReDim mypoints(mycount)
For i = 1 To mycount
mypoints(i).X = i * 10
mypoints(i).Y = -1 * (Sin(i)) ^ 2 * Me.Height
Next
a = Me.CreateGraphics
a.Clear(Me.BackColor)
a.ScaleTransform(1, -1)
a.DrawCurve(mypen, mypoints)
a.Dispose()
mypen.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>
Fill Closed Curve
<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms public class FillClosedCurve
public Shared Sub Main
Application.Run(New FillModesForm)
End Sub
End class
Public Class FillModesForm
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 = "FillModesForm"
End Sub
- End Region
Private Sub FillModesForm_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 / 2
Dim height As Integer = Me.ClientRectangle.Height
Dim fillBrush As Brush = Brushes.Gray
Dim pen As Pen = New Pen(Color.Red, 4)
Dim pointPen As Pen = New Pen(Color.Black, 3)
pointPen.StartCap = pointPen.EndCap = LineCap.SquareAnchor
Dim points As PointF() = New PointF() {New PointF(x + 25, y + height - 25), New PointF(x + width - 25, y + height - 25), New PointF(x + 25, height / 2), New PointF(x + width - 25, y + 25), New PointF(x + 25, y + 25), New PointF(x + width - 25, height / 2)}
g.DrawClosedCurve(pen, points)
Dim fill As FillMode = FillMode.Winding
g.FillClosedCurve(fillBrush, points, fill)
End Sub
End Class</source>
