اولا هناك طرق مختلفة لرسم المنحنايات وتختلف في نوع وعدد البراميتر حسب المنهجية المستخدم في الرسم فمثلا لو تم استخدام:
Vb.net for windows Application:
this example do that:
Imports System
Imports System.Windows.Forms
Imports System.Drawing
Imports System.Drawing.Drawing2D
Public Class MainClass
Shared Sub Main()
Dim form1 As Form1 = new Form1
Application.Run(form1)
End Sub
End Class
Public Class Form1
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.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.
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
'
'Form1
'
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(504, 629)
Me.Name = "Form1"
Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScree n
Me.Text = "Form1"
End Sub
#End Region
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
End Sub
Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
Dim R1 As New Rectangle(10, 10, 40, 40)
e.Graphics.SmoothingMode = SmoothingMode.HighQuality
'Use first rect to bound arc
e.Graphics.ResetTransform()
e.Graphics.TranslateTransform(200.0F, 50.0F)
e.Graphics.DrawArc(Pens.DarkBlue, R1, 40, 160)
End Sub
End Class
/////////////////////////////////////////////////////////////////////////////////
وهذا المثال الكامل لرسم الارك باستخدام ثلاثة نقاط for ArcInfo:
ArcINFO::::::::::::::::::::::::::
Private Sub UIToolControl1_MouseDown(ByVal button As Long, ByVal shift As Long, ByVal X As Long, ByVal Y As Long)
Dim pMxDoc As IMxDocument
Set pMxDoc = ThisDocument
Dim pMap As IMap
Set pMap = pMxDoc.FocusMap
Dim pEnumFeat As IEnumFeature
Set pEnumFeat = pMap.FeatureSelection
pEnumFeat.Reset
Dim pFeat As IFeature
Set pFeat = pEnumFeat.Next
Do Until pFeat Is Nothing
Dim pFeatClass As IFeatureClass
Set pFeatClass = pFeat.Class
If pFeatClass.ShapeType = esriGeometryPolyline Then
Dim pSegColl As ISegmentCollection
Set pSegColl = pFeat.Shape
MsgBox pSegColl.SegmentCount, vbOKOnly, "SEGMENT"
Dim pSegment As ISegment
Set pSegment = pSegColl.Segment(0)
Dim pFrmPoint As IPoint
Dim pToPoint As IPoint
Set pFrmPoint = pSegment.FromPoint
Dim pMidPoint As IPoint
Set pMidPoint = pFrmPoint
Dim pTargetFeatClass As IFeatureClass
Set pTargetFeatClass = pFeatClass
End If
If pFeatClass.ShapeType = esriGeometryPolygon Then
Set pSegColl = pFeat.Shape
'I get here the last segment of the polygon(square)
Set pSegment = pSegColl.Segment(3)
Set pFrmPoint = pSegment.FromPoint
Set pToPoint = pSegment.ToPoint
End If
Set pFeat = pEnumFeat.Next
Loop
Dim pCircularFeat As IFeature
Set pCircularFeat = New Feature
Set pCircularFeat = pTargetFeatClass.CreateFeature
Dim pSeg As ISegment
Dim pZaware As IZAware
Set pSeg = CreateCArcThreePoint(pFrmPoint, pMidPoint, pToPoint)
Set pSegColl = New Polyline
Set pZaware = pSegColl
pZaware.ZAware = True
pSegColl.AddSegment pSeg
Set pCircularFeat.Shape = pSegColl
pCircularFeat.Store
End Sub
Public Function CreateCArcThreePoint(FromPoint As IPoint, MidPoint As IPoint, ToPoint As IPoint) As ICircularArc
Dim ConstCArc As IConstructCircularArc
Set CreateCArcThreePoint = New CircularArc
Set ConstCArc = CreateCArcThreePoint
ConstCArc.ConstructThreePoints FromPoint, MidPoint, ToPoint, True
End Function
رد مع اقتباس