vb.net - 通过给出 x 和 y 坐标通过循环创建重复线

Question

我正在尝试 VB.Net 的绘制事件，对于这个实验，我想创建一条重复的水平或垂直（取决于我输入的参数）线并循环直到它遇到相应的端点 x 和 y。

像这样的东西：

我想要实现的是给定x 和 y 起点以及x 和 y 终点，该函数应创建从给定起点开始的垂直或水平线，直到到达给定终点。

我可以使用paintevent创建曲线和直线，但现在我不知道如何在给定的x和y起点和终点执行循环。

Answer 1

您只需要使用 For 循环来迭代 x/y 坐标。这是一个例子：

Public Class Form1

    Private Enum Orientation
        Vertical
        Horizontal
    End Enum

    Protected Overrides Sub OnPaint(e As PaintEventArgs)

        Dim orient As Orientation = Orientation.Vertical
        Dim x As Integer = 100          'X Coord
        Dim y As Integer = 100          'Y Coord
        Dim count As Integer = 10       'Number of Lines to draw
        Dim spacing As Integer = 5      'Spacing between lines in pixels
        Dim length As Integer = 20      'Length of each line in pixels
        Dim thickness As Integer = 3    'Thickness of each line in pixels

        drawLines(x, y, orient, count, spacing, length, thickness, e.Graphics)
    End Sub

    Private Sub drawLines(x As Integer, y As Integer, orient As Orientation, count As Integer, spacing As Integer, length As Integer, thickness As Integer, g As Graphics)

        'Create the Pen in a using block so it will be disposed.  
        'The code uses a red pen, you can use whatever color you want
        Using p As New Pen(Brushes.Red, CSng(thickness))

            'Here we iterate either the x or y coordinate to draw each
            'small segment.
            For i As Integer = 0 To count - 1
                If orient = Orientation.Horizontal Then
                    g.DrawLine(p, x + ((thickness + spacing) * i), y, x + ((thickness + spacing) * i), y + length)
                Else
                    g.DrawLine(p, x, y + ((thickness + spacing) * i), x + length, y + ((thickness + spacing) * i))
                End If
            Next

        End Using

    End Sub
End Class

Answer 2

您是否尝试过类似的方法：

For x = xstart to xend Step Spacing

Next

在哪里：

• xstart = 你的起点
• xend = 你的终点
• 间距 = 线之间的距离