For X = -10 To 10 Step 0.05
TmpStr = Replace(ucase$(MathStr), "X", X) '替换掉原公式中的值
Y = ScriptControl1.Eval(TmpStr) '根据表达式计算值.
'坐标原点是500,500
Picture1.CurrentX = 1000 + X * 15
Picture1.CurrentY = 3000 - Y * 15
Picture1.Print "."
Next
End Sub
Private Sub Command1_Click()
Dim MathStr As String
Dim TmpStr As String
MathStr = "2*(X^2)+3*(X)+23" '定义一个数学函数
For X = -10 To 10 Step 0.05
TmpStr = Replace(MathStr, "X", X) '替换掉原公式中的值
Y = ScriptControl1.Eval(TmpStr) '根据表达式计算值.
'坐标原点是500,500
Picture1.CurrentX = 1000 + X * 15
Picture1.CurrentY = 3000 - Y * 15 '注意,电脑的Y坐标与数学坐标是相反的.
Picture1.Print "."
Next
End Sub