使用OpenGL渲染四面体并使用SOLIDWORKS API处理视图显示模式

这个示例演示了如何使用OpenGL图形渲染四面体几何体，并处理不同的显示模式（填充、填充带边缘、隐藏线、隐藏线可见、线框）。

一旦插件被编译，每次打开或创建新的3D模型（零件或装配）时，四面体都会被渲染。

在SOLIDWORKS模型视图的快捷菜单中更改显示模式以查看图形更新。

{ width=350 }

显示模式

填充带边缘

通过渲染两层图形实现：填充的三角形和位于三角形上方的未填充线条。

{ width=200 }

填充

通过渲染三角形实现

{ width=200 }

隐藏线

通过将多边形模式设置为线条来实现。

{ width=200 }

隐藏线可见

通过以线条模式渲染虚线来实现

{ width=200 }

线框

通过以线条模式渲染图形来实现

{ width=200 }

源代码可以从GitHub下载。

AddIn.vb

这是插件的入口点。使用SwEx.AddIn框架来通过提供包装类来管理文档的生命周期。

Imports CodeStack.SwEx.AddIn
Imports CodeStack.SwEx.AddIn.Attributes
Imports System.Runtime.InteropServices

<ComVisible(True), Guid("A28F5BB7-E468-48B6-9BBD-9E7A31FF8CC8")>
<AutoRegister("OpenGL Box Tetrahedron")>
Public Class AddIn
    Inherits SwAddInEx

    Public Overrides Function OnConnect() As Boolean
        CreateDocumentsHandler(Of OpenGlDocumentHandler)()
        Return True
    End Function
End Class

OpenGlDocumentHandler.vb

这是每个模型文档的处理程序类，它订阅SOLIDWORKS提供的OpenGL缓冲区交换通知，并执行四面体三角形坐标的计算和渲染几何体。

Imports CodeStack.SwEx.AddIn.Base
Imports SolidWorks.Interop.sldworks
Imports System.Drawing
Imports SolidWorks.Interop.swconst
Imports CodeStack.OglTetrahedron.OpenGl

Public Class OpenGlDocumentHandler
    Implements IDocumentHandler

    ReadOnly m_FaceColor As Color = Color.Green
    ReadOnly m_EdgeColor As Color = Color.Black

    Dim m_MathUtils As IMathUtility
    Dim m_Model As IModelDoc2
    Dim m_View As ModelView

    Public Sub Init(ByVal app As ISldWorks, ByVal model As IModelDoc2) Implements IDocumentHandler.Init

        m_MathUtils = app.IGetMathUtility
        m_Model = model
        m_View = model.IActiveView

        If m_View IsNot Nothing Then
            AddHandler m_View.BufferSwapNotify, AddressOf OnBufferSwapNotify
        End If

    End Sub

    Private Function OnBufferSwapNotify() As Integer

        Dim a As Double() = New Double() {0, 0, 0}
        Dim b As Double() = New Double() {1, 0, 0}
        Dim c As Double() = New Double() {0.5, Math.Sqrt(3) / 2, 0}
        Dim d As Double() = New Double() {0.5, Math.Sqrt(3) / 6, Math.Sqrt(6) / 3}

        Select Case CType(m_View.DisplayMode, swViewDisplayMode_e)
            Case swViewDisplayMode_e.swViewDisplayMode_ShadedWithEdges
                DrawTetrahedron(m_FaceColor, True, False, False, 3.0F)
                DrawTetrahedron(m_EdgeColor, True, True, False, 3.0F)
            Case swViewDisplayMode_e.swViewDisplayMode_Shaded
                DrawTetrahedron(m_FaceColor, True, False, False, 3.0F)
            Case swViewDisplayMode_e.swViewDisplayMode_HiddenLinesRemoved '
                DrawTetrahedron(m_EdgeColor, False, False, False, 3.0F)
            Case swViewDisplayMode_e.swViewDisplayMode_HiddenLinesGrayed '
                DrawTetrahedron(m_EdgeColor, True, True, True, 1.0F)
            Case swViewDisplayMode_e.swViewDisplayMode_Wireframe
                DrawTetrahedron(m_EdgeColor, True, True, False, 3.0F)
        End Select

        Dim pt1 As IMathPoint = m_MathUtils.CreatePoint(New Double() {0, 0, 0})
        Dim pt2 As IMathPoint = m_MathUtils.CreatePoint(New Double() {1, 1, 1})

        m_Model.Extension.SetVisibleBox(pt1, pt2)

        Return 0

    End Function

    Private Sub DrawTetrahedron(color As Color, fill As Boolean, wireframe As Boolean, dashed As Boolean, width As Single)

        Dim a As Double() = New Double() {0, 0, 0}
        Dim b As Double() = New Double() {1, 0, 0}
        Dim c As Double() = New Double() {0.5, Math.Sqrt(3) / 2, 0}
        Dim d As Double() = New Double() {0.5, Math.Sqrt(3) / 6, Math.Sqrt(6) / 3}

        DrawTriangle(a, c, b, color, fill, wireframe, dashed, width)
        DrawTriangle(a, d, c, color, fill, wireframe, dashed, width)
        DrawTriangle(c, d, b, color, fill, wireframe, dashed, width)
        DrawTriangle(d, a, b, color, fill, wireframe, dashed, width)

    End Sub

    Private Sub DrawTriangle(a() As Double, b() As Double, c() As Double, color As Color, fill As Boolean, wireframe As Boolean, dashed As Boolean, width As Single)

        glPolygonMode(GL_FRONT_AND_BACK, IIf(fill, GL_FILL, GL_LINE))

        glDisable(GL_LIGHTING)

        If wireframe Then

            glEnable(GL_LINE_SMOOTH)

            If dashed Then
                glEnable(GL_LINE_STIPPLE)
                glLineStipple(4, &HAAAA)
            End If

        End If

        glBegin(IIf(wireframe, GL_LINE_LOOP, GL_TRIANGLES))

        If wireframe Then
            glLineWidth(width)
        End If

        glColor4f(color.R / 255.0F, color.G / 255.0F, color.B / 255.0F, color.A / 255.0F)
        glVertex3d(a(0), a(1), a(2))
        glVertex3d(b(0), b(1), b(2))
        glVertex3d(c(0), c(1), c(2))

        glEnd()

        glDisable(GL_LINE_SMOOTH)
        glDisable(GL_LINE_STIPPLE)

    End Sub

    Public Sub Dispose() Implements IDisposable.Dispose
        If m_View IsNot Nothing Then
            RemoveHandler m_View.BufferSwapNotify, AddressOf OnBufferSwapNotify
        End If
    End Sub

End Class

OpenGL.vb

OpenGL函数的导入列表。

Imports System.Runtime.InteropServices

Public Class OpenGl

    <DllImport("opengl32")>
    Public Shared Sub glBegin(ByVal mode As UInteger)
    End Sub

    <DllImport("opengl32")>
    Public Shared Sub glEnd()
    End Sub

    <DllImport("opengl32")>
    Public Shared Sub glVertex3d(ByVal x As Double, ByVal y As Double, ByVal z As Double)
    End Sub

    <DllImport("opengl32.dll")>
    Public Shared Sub glDisable(ByVal cap As UInteger)
    End Sub

    <DllImport("opengl32.dll")>
    Public Shared Sub glColor4f(ByVal R As Single, ByVal G As Single, ByVal B As Single, ByVal A As Single)
    End Sub

    <DllImport("opengl32.dll")>
    Public Shared Sub glEnable(ByVal cap As UInteger)
    End Sub

    <DllImport("opengl32.dll")>
    Public Shared Sub glPolygonMode(ByVal face As UInteger, ByVal mode As UInteger)
    End Sub

    <DllImport("opengl32.dll")>
    Public Shared Sub glLineWidth(ByVal width As Single)
    End Sub

    <DllImport("opengl32.dll")>
    Public Shared Sub glLineStipple(ByVal factor As Integer, ByVal pattern As UShort)
    End Sub

    Public Const GL_FRONT_AND_BACK As Integer = &H408
    Public Const GL_LINE As UInteger = &H1B01
    Public Const GL_FILL As UInteger = &H1B02

    Public Const GL_TRIANGLES As UInteger = &H4
    Public Const GL_LINE_LOOP As UInteger = &H2
    Public Const GL_LIGHTING As UInteger = &HB50
    Public Const GL_LINE_SMOOTH As UInteger = &HB20
    Public Const GL_LINE_STIPPLE As UInteger = &HB24

End Class