?
Solved

How to determine if a point is on the left or right of a given line

Posted on 2008-10-31
3
Medium Priority
?
1,945 Views
Last Modified: 2013-12-21
Hello,
This is a math / geometry question really.

I am trying to find out if a given coordinate (x0,y0) is on the left or right of a line formed by two other points (x1,y1) and (x2, y2).

I am sure its simple geometry, but if you don't know it, its not so simple :).
0
Comment
Question by:HRCIII
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 74

Accepted Solution

by:
sdstuber earned 2000 total points
ID: 22852095
determine  x =   (y0-y1)(x2-x1)/(y2-y1) + x1

if x < x0 then point is right of line
if x= x0 then point is on line
if x > x0 then point is left of line
0
 

Author Closing Comment

by:HRCIII
ID: 31512130
Thank you,

This works beautifully and saves me a major amount of time.

-HRC
0
 
LVL 74

Expert Comment

by:sdstuber
ID: 22852439
glad I could help
0

Featured Post

Will your db performance match your db growth?

In Percona’s white paper “Performance at Scale: Keeping Your Database on Its Toes,” we take a high-level approach to what you need to think about when planning for database scalability.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Recently, in one of the tech-blogs I usually read, I saw a post about the best-selling video games through history. The first place in the list is for the classic, extremely addictive Tetris. Well, a long time ago, in a galaxy far far away, I was…
Introduction A frequently used term in Object-Oriented design is "SOLID" which is a mnemonic acronym that covers five principles of OO design.  These principles do not stand alone; there is interplay among them.  And they are not laws, merely princ…
I've attached the XLSM Excel spreadsheet I used in the video and also text files containing the macros used below. https://filedb.experts-exchange.com/incoming/2017/03_w12/1151775/Permutations.txt https://filedb.experts-exchange.com/incoming/201…
Have you created a query with information for a calendar? ... and then, abra-cadabra, the calendar is done?! I am going to show you how to make that happen. Visualize your data!  ... really see it To use the code to create a calendar from a q…

800 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question