Public Function Interf(ByRef Dxa As Double, ByRef Dya As Double, ByRef Dxb As Double, ByRef Dyb As Double) As Integer
If Dxa = 0 And Dxb = 0 Then
Return 1
End If
If Dya = 0 And Dyb = 0 Then
Return 1
End If
If Dxa <> 0 And Dxb <> 0 Then
If Dya / Dxa = Dyb / Dxb Then
Return 1
End If
End If
If Dxa = 0 And Dxb <> 0 Then
Return 2
End If
If Dxb = 0 And Dxa <> 0 Then
Return 3
End If
Return 4
End Function
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X1 = Val(TextBox1.Text)
Y1 = Val(TextBox2.Text)
X2 = Val(TextBox3.Text)
Y2 = Val(TextBox4.Text)
X3 = Val(TextBox5.Text)
Y3 = Val(TextBox6.Text)
X4 = Val(TextBox7.Text)
Y4 = Val(TextBox8.Text)
Dx1 = (X2 - X1)
Dy1 = (Y2 - Y1)
Dx2 = (X4 - X3)
Dy2 = (Y4 - Y3)
sa2 = Interf(Dx1, Dy1, Dx2, Dy2)
If sa2 = 1 Then
TextBox9.Text = "平行" : TextBox10.Text = "平行" : Exit Sub
Else
Select Case sa2
Case 2
X5 = X1 : Y5 = (Dy2 / Dx2) * (X5 - X3) + Y3
Case 3
X5 = X3 : Y5 = (Dy1 / Dy2) * (X5 - X1) + Y1
Case 4
X5 = (Y3 - Y1 + (Dy1 / Dx1) * X1 - (Dy2 / Dx2) * X3) / (Dy1 / Dx1 - Dy2 / Dx2) : Y5 = (Dy1 / Dx1) * (X5 - X1) + Y1
End Select
End If
TextBox9.Text = X5
TextBox10.Text = Y5
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