vb使用picturebox画曲线图

本文主要是介绍vb使用picturebox画曲线图，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

'添加个picture1和command1

Option Explicit
Dim lngCenter As Long
Dim lngMax As Long
Dim lngPad&
Dim PCurrent As POINT, PLast As POINT
Private Type POINTx As Longy As Long
End Type
Private Sub Form_Load()lngCenter = (Picture1.Top + Picture1.Height) / 2lngMax = Picture1.HeightPLast.x = 0PLast.y = lngCenterDim i&For i = 0 To Picture1.Width Step 100Picture1.Line (i, 0)-(i, Picture1.Height), &HFFC0C0NextFor i = 0 To Picture1.Height Step 100Picture1.Line (0, i)-(Picture1.Width, i), &HFFC0C0NextPicture1.DrawWidth = 1.5Picture1.Line (0, lngCenter)-(Picture1.Width, lngCenter), vbBluePicture1.DrawWidth = 1
End Sub
Private Sub Timer1_Timer()PCurrent.x = PCurrent.x + 50RandomizePCurrent.y = Rnd * lngMaxPicture1.Line (PCurrent.x, PCurrent.y)-(PLast.x, PLast.y), vbRedPLast.x = PCurrent.xPLast.y = PCurrent.y
End Sub
Private Sub Command1_Click()Timer1.Enabled = Not Timer1.Enabled
End Sub

效果图：

如果需要带有点规律性可以将获得y的坐标稍加处理下：

Private Function getRndY() As Integer
    Dim lngTmp%
   
    If intRnd = 0 Then
        Randomize
        intRnd = Rnd * 3 + 1
    End If
   
    Randomize
    lngTmp = Rnd * lngCenter
    If PLast.y > lngCenter Then
        getRndY = lngCenter + lngTmp
    Else
        getRndY = lngTmp
    End If
   
    intCurRnd = intCurRnd + 1
    If intCurRnd > intRnd Then
        Randomize
        intRnd = Rnd * 3 + 1
        getRndY = Rnd * lngMax
        intCurRnd = 0
    End If
End Function

 

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