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
_
Partial Class Form1
Inherits System.Windows.Forms.Form
'Form overrides dispose to clean up the component list.
_
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.ComponentModel.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.
_
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.ComponentModel.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.ComponentModel.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