在 vb.net 中绘制一个矩形

Question

我想在表单上绘制一个简单的二维矩形。

因为我从未在 vb.net 中做过任何图形操作，所以我在网上搜索并找到了许多实例，它们提供了与此类似的解决方案。

Public Sub DrawRectangleRectangle(ByVal e As PaintEventArgs)

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

    ' Create rectangle. 
    Dim rect As New Rectangle(0, 0, 200, 200)

    ' Draw rectangle to screen.
    e.Graphics.DrawRectangle(blackPen, rect)
End Sub

然而，我不明白这是怎么回事.. 这是什么e As PaintEventArgs？这个子需要什么输入？如何画一个简单的矩形？

对于初学者，我想要一些简单的东西，这样我就可以对其进行试验并最终学习更高级的东西。

Answer 1

好的这段代码之前运行良好，你可以测试学习

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

   'dimension variables of local scope

    Dim myGraphics As Graphics

    Dim myRectangle As Rectangle

    Dim myPen As New Pen(Color.Blue)

   'return the current form as a drawing surface

    myGraphics = Graphics.FromHwnd(ActiveForm().Handle)

    'create a rectangle based on x,y coordinates, width, & height

    myRectangle = New Rectangle(x:=5, y:=5, Width:=10, Height:=40)

   'draw rectangle from pen and rectangle objects

    myGraphics.DrawRectangle(pen:=myPen, rect:=myRectangle)

    'create a rectangle based on Point and Size objects

    myRectangle = New Rectangle(Location:=New Point(10, 10), Size:=New Size(Width:=20, Height:=60))

    'draw another rectangle from Pen and new Rectangle object

    myGraphics.DrawRectangle(pen:=myPen, rect:=myRectangle)

    'draw a rectangle from a Pen object, a rectangle's x & y, 

      ' width, & height

   myGraphics.DrawRectangle(pen:=myPen, x:=20, y:=20, Width:=30, Height:=80)

 End Sub