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vb.net画函数图,vb编写简单的画图程序

如何用vb画出简易函数图像

用vb画出简易函数图像的操作步骤为:

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(1)新建一个工程,新建一个Form1,在上面添加一个picture控件和一个command控件;

(2)选中此控件,右击"复制",在窗体空白处右击"粘贴",在弹出的对话框中选择"是",创建了一个Command控件数组,复制,使窗体上总共出现7个Command控件;

(3)复制代码:

Const Pi = 3.1415926535 '定义圆周率

Dim a, wor

Dim i As Integer

Static Function Loge(X)

Loge = Log(X) / Log(Exp(1))

End Function

'定义用于在Picture1上的一个位置打印字符函数

Private Function PrintWord(X, y, Word As String)

With Picture1

.CurrentX = X

.CurrentY = y

.ForeColor = RGB(0, 0, 255)

End With

Picture1.Print Word

End Function

Private Function DrawDot(Px, Py, Color)

Picture1.PSet (Px, Py), Color

End Function

Sub XY() '建立直角坐标系

Picture1.DrawWidth = 1 '设置线条宽度

Picture1.Cls

'设定用户坐标系,坐标原点在Picture1中心

Picture1.Scale (-10, 10)-(10, -10)

Picture1.Line (-10, 0)-(10, 0), RGB(0, 0, 255)

Picture1.Line -(9.5, 0.5), RGB(0, 0, 255)

Picture1.Line (10, 0)-(9.5, -0.5), RGB(0, 0, 255)

Picture1.ForeColor = RGB(0, 0, 255)

Picture1.Print "X"

'画 X 轴

Picture1.Line (0, -10)-(0, 10), RGB(0, 0, 255)

Picture1.Line -(0.5, 9.5), RGB(0, 0, 255)

Picture1.Line (0, 10)-(-0.5, 9.5), RGB(0, 0, 255)

Picture1.Print "Y"

'画 Y 轴

For lin = -9 To 9

Picture1.Line (lin, 0)-(lin, 0.25)

wor = PrintWord(lin - 0.5, -0.5, Str(lin))

Picture1.Line (0, lin)-(-0.25, lin)

If lin 0 Then

wor = PrintWord(-0.9, lin, Str(lin))

End If

Next lin

Picture1.DrawWidth = 2

End Sub

Private Sub Command1_Click(Index As Integer)

Select Case Index

Case 0

For a = -3 To 3 Step Pi / 6000

Dot = DrawDot(a, a ^ 2, RGB(0, 0, 0))

Next a

wor = PrintWord(4, 9, "二次曲线 y=x^2")

Case 1

For a = -9 To 9 Step Pi / 6000

Dot = DrawDot(a, a, RGB(0, 0, 0))

Next a

wor = PrintWord(8, 5, "一次曲线 y=x")

Case 2

For a = -9 To 3 Step Pi / 6000

Dot = DrawDot(a, Exp(a), RGB(0, 0, 0))

Next a

wor = PrintWord(4, 9, "指数曲线 y=e^x")

Case 3

For a = 0.0001 To 9 Step Pi / 6000

Dot = DrawDot(a, Loge(a), RGB(0, 0, 0))

Next a

wor = PrintWord(8, 3, "对数曲线 y=ln x")

Case 4

For a = -10 To 10 Step Pi / 6000

Dot = DrawDot(a, Sin(a), RGB(0, 0, 0))

Next a

wor = PrintWord(-5, 2, "正弦曲线 y=sin x")

Case 5

For a = -10 To 10 Step Pi / 6000

Dot = DrawDot(a, Cos(a), RGB(0, 0, 0))

Next a

wor = PrintWord(-9, 2, "余弦曲线 y=cos x")

Case 6

XY

End Select

End Sub

Private Sub Form_Load()

Me.Caption = "数学函数作图?quot;"

Me.Show

Me.AutoRedraw = True

Picture1.AutoRedraw = True

Command1(0).Caption = "二次曲线"

Command1(1).Caption = "一次曲线"

Command1(2).Caption = "指数曲线"

Command1(3).Caption = "对数曲线"

Command1(4).Caption = "正弦曲线"

Command1(5).Caption = "余弦曲线"

Command1(6).Caption = "清空"

XY

End Sub

Private Sub Form_Resize()

Picture1.Width = Me.Width * 0.94

Picture1.Height = Me.Height - (Command1(0).Height * 4 + 100)

Command1(0).Top = Me.Height - (Command1(0).Height * 2.5 + 100)

Command1(0).Left = Me.Width * 0.01

For i = 1 To 6

Command1(i).Top = Me.Height - (Command1(0).Height * 2.5 + 100)

Command1(i).Left = Command1(i - 1).Left + 1000

Next

XY

End Sub

VB.net中如何画图?

VB.net与VB不同。

VB.net已经有专门绘图的类。

可以定义笔刷然后用Drawing类中的方法绘制。

Private Sub DrawEllipse()

Dim myPen As New System.Drawing.Pen(System.Drawing.Color.Red)

Dim formGraphics as System.Drawing.Graphics

formGraphics = Me.CreateGraphics()

formGraphics.DrawEllipse(myPen, New Rectangle(0,0,200,300))

myPen.Dispose()

formGraphics.Dispose()

End Sub

Private Sub DrawRectangle()

Dim myPen As New System.Drawing.Pen(System.Drawing.Color.Red)

Dim formGraphics as System.Drawing.Graphics

formGraphics = Me.CreateGraphics()

formGraphics.DrawRectangle(myPen, New Rectangle(0,0,200,300))

myPen.Dispose()

formGraphics.Dispose()

End Sub

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怎么绘制带坐标轴的的一次函数?最好附上源码。

1、利用公式求出Y值  第一列设置表头为x,下面依次填入取值, 比如 x 1 2 3 4 ...... 第二例表头设置为y,在下面表格中填入计算公式 如 =2*x+1 然后选中点右下角的十字型标记,拖下去,和前面x数量一致。 2、然后选中数据源(即选中要进行操作的数据区域,这里指XY值所在区域。) 3、执行菜单命令插入——图表——XY散点图  执行命令,打开图表向导对话框选XY散点图--选平滑线散点图--完成  最后使用图表向导在横坐标填入x值,纵坐标填入y值,生成图即可 将一次函数的Y列用公式编辑出来,分别填写出当取不同的X值时得到不的函数值,选择函数值所在列,插入——图表按提示操作。执行菜单命令 执行菜单命令

怎么用VB画函数图像?

1、先定义坐标系,即XY轴。

2、根据具体需要,调用内部函数,或自定义函数,绘制函数图像。

3、代码供参考:

Me.AutoRedraw = True

Me.Width = 8000: Me.Height = 6000

Me.Scale (-10, 2)-(10, -2)

Line (0, -2)-(0, 2)

Line (-20, 0)-(20, 0)

For i! = -2 To 2 Step 0.5

Line (0, i)-(0.5, i)

CurrentX = -1.8

CurrentY = i

Print i

Next i

For j! = -8 To 10 Step 2

Line (j, 0)-(j, 0.05)

CurrentX = j - 0.5

CurrentY = 0

If Abs(j) 0 Then Print j

Next j

For k = -10 To 10 Step 0.01

PSet (k, Sin(k)), vbRed

PSet (k, Cos(k)), vbBlue

Next k


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