Question

我想在表单上绘制一个简单的2d矩形。

因为我从未在vb.net中做过任何图形化的事情，所以我在网上搜索了很多实例，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，我不明白这是如何运作的.. 这是e As PaintEventArgs的内容是什么？该子要求输入什么？如何绘制一个简单的矩形？

对于初学者来说，我想要一些简单的工作，这样我就可以对它进行实验并最终学习更高级的东西。

Answer 1

确定此代码之前正常工作，您可以测试它以进行学习

    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

在vb.net中绘制一个矩形

1 个答案: