vb.net - 使用do-while循环的Visual Basic drawpolygon方法？

Question

我正在寻求有关 drawpolygon 方法的帮助。我没有任何运气可以工作。想做 5 个三角形，大小相同，彼此相邻。问题是我必须使用 do-while 循环。感谢您花时间帮助我！！

Answer 1

只需在数组中定义点，然后用笔写它们：

Dim blackPen As New Pen(Color.Black, 3)

Dim point1 As New Point(50, 50)
Dim point2 As New Point(100, 25)
Dim curvePoints As Point() = {point1, point2}

Me.CreateGraphics.DrawPolygon(blackPen, curvePoints)

查看有关它的MSDN 文档。

你是否在循环中做任何事情都没有关系，取决于如何。如果这不能解决您的问题，请发布您的代码以便为您提供更多帮助。

带有循环的示例：

Do While i < 3
    point1 As New Point(50 + i * 10, 50)
    point2 As New Point(100 + i * 7, 25)

    curvePoints = {point1, point2}
    Me.CreateGraphics.DrawPolygon(blackPen, curvePoints)
    i += 1
Loop

Answer 2

我还没有真正测试过这个结构，但它都是从一个工作项目中剪下来的；我怀疑它会起作用，而且第一次拿起这些 GDI+ 的东西真的很蹩脚。

Public Class Form1
Private subject As Image

Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
    If Not subject Is Nothing Then
        Dim g As Graphics = e.Graphics
        g.DrawImage(subject, New Point(1, 1))
    End If
End Sub

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    Dim tempBM As New Bitmap(subject)
    tempBM.SetResolution(subject.HorizontalResolution, subject.VerticalResolution)
    Using g As Graphics = Graphics.FromImage(tempBM)
         g.DrawPolygon(OutlinePen, Polygon.GetPoints)
    End Using
    subject = tempBM
    Invalidate()
End Sub
End Class

哦，Polygon 是我的代码中的一个类，你不会有。但是只需将 Polygon.GetPoints 替换为您想要使用的任何点数组。