檢視 $xd 的原始碼

This function is to determine the position of contact. This function should be use with [[$contact]].

'''<big><big>Format</big></big>'''
 $xd
 contact1_start  contact1_end
 contact2_start  contact2_end
 ...
 contactn_start  contactn_end


'''<big><big>Example</big></big>'''
 $xd 
 -0.0001   19.9999 
 25.0000   38.0000 
 50.0001   70.0000

 $contact 
 3    
 21 
 4   

This function should be use with $contact.

[[$contact]],