VB.net中如何在picturebox画线，有什么函数？

Dim b As New Bitmap(PictureBox1.Width, PictureBox1.Height)

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Dim g As Graphics = Graphics.FromImage(b)

g.Clear(Color.White)

Dim p As New Pen(Color.Black)

p.EndCap = Drawing2D.LineCap.ArrowAnchor

g.DrawLine(p, 30, PictureBox1.Height - 30, 30, 30)

g.DrawLine(p, 30, PictureBox1.Height - 30, PictureBox1.Width - 30, PictureBox1.Height - 30)

Dim i As Integer

Dim bs As New SolidBrush(Color.Green)

Dim po As New Point

po.X = 0

po.Y = PictureBox1.Height - 35

For i = 700 To 1000 Step 50

g.DrawString(i, Me.Font, bs, po.X, po.Y)

g.DrawLine(p, po.X + 28, po.Y + 5, po.X + 30, po.Y + 5)

po.Y -= (PictureBox1.Height - 100) / 6

Next

po.X = 30

po.Y = PictureBox1.Height - 30

For i = 0 To 40 Step 5

g.DrawString(i, Me.Font, bs, po.X, po.Y + 5)

g.DrawLine(p, po.X, po.Y + 2, po.X, po.Y)

po.X += (PictureBox1.Width - 100) / 8

Next

PictureBox1.Image = b

大佬们~VisualStudio中vb.net如何画三角函数图像？

VB系统的坐标原点在左上角，X轴的正方向是水平向右，而Y轴的正方向是垂直向下。所以，要绘制三角函数的曲线，自己可以通过改变点坐标的方法来实现，当然，VB.NET提供了相应的方法可以来实现坐标变换，也可以通过VB.Net的Graphics类提供的平移、旋转等转换来实现。

下面是我通过自己变换实现的示例，提供参考；我的环境是VB.NET 2010

Imports System.Math

Public Class Form1

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

  '1，获得一个Graphics对象

  Dim MyGraphics As Graphics

  MyGraphics = PictureBox1.CreateGraphics

  '2，定义一个Pen对象，用于绘制图形（轮廓线）

  Dim MyPen As New Pen(Color.Black, 1)

  '3，定义一个Brush对象，用于填充图形（如果需要填充的话）

  Dim MyBrush As New SolidBrush(Color.Orange)

  MyGraphics.DrawLine(MyPen, 0, 200, 700, 200)

End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

  '1，获得一个Graphics对象

  Dim MyGraphics As Graphics

  MyGraphics = PictureBox1.CreateGraphics

  '2，定义一个Pen对象，用于绘制图形（轮廓线）

  Dim MyPen As New Pen(Color.Black, 1)

  '3，定义一个Brush对象，用于填充图形（如果需要填充的话）

  Dim MyBrush As New SolidBrush(Color.Orange)

  '声明横向和纵向比例变量

  Dim Heng As Integer = 20

  Dim Zong As Integer = 50

  '先获得正弦值，保存到点坐标数组

  Dim MyPoints(700) As Point

  Dim i As Integer

  For i = 0 To 700

      MyPoints(i) = New Point(i * Heng, 200 + Sin(i) * Zong)

  Next

  '采用绘制光滑线连接点的方式绘制曲线

  MyGraphics.DrawCurve(MyPen, MyPoints)

End Sub

End Class

显示的效果图：

vb.net的picturebox画直线的函数是哪个?vb6.0是picture1.line就可以，但是vb.net没有啊

Dim PtStart As Point '记录绘制直线的起始点

Dim PtEnd As Point '记录绘制直线的终点

Dim ShouldDrawLine As Boolean '是否绘制直线

'记录鼠标左键点击的位置，第二次点击后开始绘制直线

Private Sub Pic1_MouseDown()Sub Pic1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles Pic1.MouseDown

If e.Button = Windows.Forms.MouseButtons.Left Then

If Not ShouldDrawLine Then

PtStart = New Point(e.X, e.Y)

ShouldDrawLine = True

Else

PtEnd = New Point(e.X, e.Y)

'下面两句根据需要进行取舍

'Call DrawLine(PtStart, PtEnd) '绘制一条直线

Call DrawLines(PtStart, PtEnd) '绘制多条直线

ShouldDrawLine = False

End If

End If

End Sub

'绘制鼠标两次点击位置之间的直线

Private Sub DrawLine()Sub DrawLine(ByVal mPoint1 As Point, ByVal mPoint2 As Point)

Pic1.Refresh() '用于刷新Picturebox表面

Pic1.CreateGraphics.DrawLine(Pens.Blue, mPoint1, mPoint2) '绘制两点间的直线

End Sub

'绘制多条直线，每两次鼠标点击确定一条线

Private Sub DrawLines()Sub DrawLines(ByVal mPoint1 As Point, ByVal mPoint2 As Point)

'此句不可删除，用于清除鼠标点击前的轨迹

ControlPaint.DrawReversibleLine(Pic1.PointToScreen(mPoint1), Pic1.PointToScreen(mPoint2), Color.Red)

Pic1.CreateGraphics.DrawLine(Pens.Blue, mPoint1, mPoint2) '绘制两点间的直线

End Sub

网站题目：vb.net图形函数库 vbnet chart
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