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创建一个保存/绘制一些图形的类？

发布于 2024-10-11 10:54:47 字数 141 浏览 2 评论 0原文

好的，我想创建一个类来处理特殊的矩形图形。

在我的表单中，我想要两个特殊的矩形。所以，基本上，我的表单中需要该类的两个实例，对吗？

我设法初始化了两个，好吧。但是，我到底应该如何管理班级中的绘图/图形等，以及如何在我的表单中显示结果？

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伪装你 2024-10-18 10:54:47

您需要弄清楚一些概念才能将其组合在一起：

您需要跟踪要绘制的对象。您部分在那里，但这通常是通过某种类型的集合来完成的，例如 List(of ...)
您需要处理 Form 类（或 Panel 或 Control 或您想要绘制的任何视觉对象或on）
您需要在 Paint 处理程序中绘制对象
每当应用程序的状态发生更改时，您需要对正在绘制的对象调用 Invalidate 以“强制”重新绘制。

这是一个简短的片段：

     ' suppose you have:
     Private _myRects as New List(of Rectangle) ' populated elsewhere

     ' then you handle the paint event of a UI control
     Private Sub Control_Paint(ByVal sender As Object, ByVal e As PaintEventArgs) _
     Handles MyBase.Paint
        Dim g As Graphics = e.Graphics

        ' loop through your collection drawing each rectangle:
        for each rect As Rectangle in _myRects 
            g.FillRectangle(Brushes.Aqua, rect)
        next for

        ...more drawing as needed
    end sub

这是关于 .NET 的相当不错的教程用VB画画。如果您按照本教程进行操作，您应该拥有完成您喜欢的任何类型的 2D .NET 绘图的所有部分。（乐趣要到第 2 页才开始，但不要跳过第 1 页！）

There are a few concepts you need to figure out to put this together:

You need to track the objects you're going to draw. You're partially there but this is usually done with a collection of some sort like List(of ...)
You need to handle the Paint event of your Form class (or Panel or Control or whatever visual object you want to draw in or on)
You need to draw your objects within you Paint handler
Whenever the state of your application changes you need to call Invalidate on the object that is being painted to "force" a fresh repaint.

Here's a quick snippet:

     ' suppose you have:
     Private _myRects as New List(of Rectangle) ' populated elsewhere

     ' then you handle the paint event of a UI control
     Private Sub Control_Paint(ByVal sender As Object, ByVal e As PaintEventArgs) _
     Handles MyBase.Paint
        Dim g As Graphics = e.Graphics

        ' loop through your collection drawing each rectangle:
        for each rect As Rectangle in _myRects 
            g.FillRectangle(Brushes.Aqua, rect)
        next for

        ...more drawing as needed
    end sub

And here is a pretty nice tutorial on .NET painting with VB. If you follow it through you should have all the pieces to do any kind of 2D .NET drawing you like. (The fun doesn't start until page 2 but do not skip page 1!)

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