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>