vb.net样条曲线 vb曲线控件
VB.NET 实时曲线
拖一个PictureBox1控件 创建一个Paint事件。在事件中加入 Private Sub PictureBox1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles PictureBox1.Paint ' Create pens. Dim redPen As New Pen(Color.Red, 3) Dim greenPen As New Pen(Color.Green, 3) ' Create points that define curve. Dim point1 As New Point(50, 50) Dim point2 As New Point(100, 25) Dim point3 As New Point(200, 5) Dim point4 As New Point(250, 50) Dim point5 As New Point(300, 100) Dim point6 As New Point(350, 200) Dim point7 As New Point(250, 250) Dim curvePoints As Point() = {point1, point2, point3, point4, _ point5, point6, point7} ' Draw lines between original points to screen. e.Graphics.DrawLines(redPen, curvePoints) ' Draw curve to screen. e.Graphics.DrawCurve(greenPen, curvePoints) End Sub 得到数据后，改point的数据。然后PictureBox1.Refresh()就行了
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vb.net绘制曲线图
。net 其实还是很好绘制图形的
你可以看下 Graphics 类
Dim d As New Bitmap(Me.Width, Me.Height) ‘一个图片吧
Dim g As Graphics = Graphics.FromImage(d)’绘制 准备在这个图片是进行
然后 就是你绘制的东西了
线 就是 g.DrawLine()
圆 弧度 就用 g.DrawArc(Pens.Black, New Rectangle(0, 0, 400, 200), 0, 360)
复杂的就是 g.DrawBezier()
等 如果你用的是 VS的 编译 上面都有详细的参数说明
Dim d As New Bitmap(Me.Width, Me.Height)
Dim g As Graphics = Graphics.FromImage(d)
g.DrawArc(Pens.Black, New Rectangle(0, 0, 200, 200), 0, 360)
g.DrawLine(Pens.Red, New Point(0, 0), New Point(200, 200))
g.DrawLines(Pens.Green, New Point() {New Point(0, 0), New Point(50, 40), New Point(50, 80), New Point(90, 70), New Point(100, 400)})
g.DrawBezier(Pens.Yellow, New Point(0, 100), New Point(0, 0), New Point(200, 0）， New Point(200, 200))
g.Dispose()
Me.BackgroundImage = d
vb中样条曲线问题
不引用的话，VB做不到。这事情要看VB的版本。如果是6.0的话，要去网上下载GDIPLUS的库文件或者自己声明GDI+的API。如果是VB.NET的话，VB自带GDI+，但是也可以下载GDIPLUS库来用。如果不知道去哪里下载，我下载有，你可以问我要。我使用VB6.0。下载gdiplus以后，在VB里面引用这个库，注意要选择“所有文件”才能看到这个库。gdi+里面的path功能可以实现样条：Private
TOKEN
As
Long'GDI+对象
Private
Graphics
As
Long'画板
Private
Sub
InitGDIPlus()
'初始化GDI+
Dim
uInput
As
GdiplusStartupInput
uInput.GdiplusVersion
=
1
If
GdiplusStartup(TOKEN,
uInput)
Ok
Then
'初始化错误
MsgBox
"GDI+
初始化错误。程序即将关闭。",
vbCritical,
"InitError"
End
End
If
GdipCreateFromHDC
Me.hDC,
Graphics'创建画板
GdipSetSmoothingMode
Graphics,
SmoothingModeAntiAlias'设置为反锯齿
End
SubPrivate
Sub
TerminateGDIPlus()
GdipDeleteGraphics
Graphics
'释放graphics占用的内存
GdiplusShutdown
TOKEN
'关闭GDI+
End
SubPrivate
Sub
Form_Load()
InitGDIPlus
'初始化End
SubPrivate
Sub
Command1_Click()
Dim
path
As
Long
Dim
m(3)
As
POINTF
'以下是坐标，你可以自由改变
m(0).x
=
m(0).y
=
m(1).x
=
10
m(1).y
=
100
m(2).x
=
20
m(2).y
=
3
m(3).x
=
500
m(3).y
=
100
Dim
pen
As
Long
GdipCreatePen1
HFF000000,
2,
UnitPixel,
pen
'创建画笔，用来画出样条
GdipCreatePath
FillModeAlternate,
path
'创建path
GdipAddPathBeziers
path,
m(0),
4
'创建样条'Count是说坐标的个数，points只能传递数组的第一个元素，不能传递数组。
GdipDrawPath
Graphics,
pen,
path
'画出样条
GdipDeletePen
pen
'删除画笔
GdipDeletePath
path
'删除样条End
SubPrivate
Sub
Form_Unload(Cancel
As
Integer)
TerminateGDIPlus
'删除GDI+
End
Sub
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