form1.vb

visual basic 实现简单的drawing example例子

Public Class Form1

   
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Me.BackColor = Color.LightGray
        cboShape.SelectedIndex = 0
        cboShape.DropDownStyle = ComboBoxStyle.DropDownList
    End Sub
    Dim insetX, insetY, shapeWidth, shapeHeight As Integer
    Dim shape As String
    Dim pen As New Pen(System.Drawing.Color.Black)
    Dim brush As New SolidBrush(System.Drawing.Color.Blue)
    Dim polyPoints(4) As Point
            

    Private Sub setVars()
        shape = cboShape.Text
        shapeWidth = nupWidth.Value
        shapeHeight = nupHeight.Value
        insetX = nupX.Value
        insetY = nupy.Value
    End Sub
    'Private Sub drawPolygonExample(ByVal e As PaintEventArgs)
    '    Dim bluePen As New Pen(Color.Blue)

  

    '    e.Graphics.DrawPolygon(bluePen, polyPoints)
    'End Sub
    Private Sub pbDrawingSurface_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles pbDrawingSurface.Paint
        If (shape = "Line Rectangle") Then
            e.Graphics.Clear(Color.LightBlue)
            e.Graphics.DrawRectangle(pen, insetX, insetY, shapeWidth, shapeHeight)
        ElseIf (shape = "Solid Rectangle") Then
            e.Graphics.FillRectangle(brush, insetX, insetY, shapeWidth, shapeHeight)
        ElseIf (shape = "Line Ellipse") Then
            e.Graphics.DrawEllipse(pen, insetX, insetY, shapeWidth, shapeHeight)
        ElseIf (shape = "Solid Ellipse") Then
            e.Graphics.FillEllipse(brush, insetX, insetY, shapeWidth, shapeHeight)
        ElseIf (shape = "Polygon") Then
            polyPoints(0).X = 1
            polyPoints(0).Y = 1
            polyPoints(1).X = 1
            polyPoints(1).Y = 25
            polyPoints(3).X = 25
            polyPoints(3).Y = 25
            polyPoints(2).X = 75
            polyPoints(2).Y = 75
            polyPoints(4).X = 1
            polyPoints(4).Y = 75
            e.Graphics.DrawPolygon(pen, polyPoints)
        ElseIf (shape = "String") Then
            Dim exampleString As String = "Here is an example String!"
            'Dim blackBrush As New SolidBrush(Color.Black)
            Dim drawFont As New Font("Arial", 18)
            e.Graphics.DrawString(exampleString, drawFont, brush, insetX, insetY)

        End If
    End Sub



    Private Sub cmbDraw_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles cmbDraw.Click
        setVars()
        pbDrawingSurface.Refresh()
    End Sub

End Class