Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win

x
?
Solved

The tale of two lines

Posted on 2001-08-07
7
Medium Priority
?
146 Views
Last Modified: 2010-05-02
If I have two lines on a graphic, and for each line I have two coordiantes.

How can I get the coordinates of the intersection between the two in the most efficiant way possible ?
0
Comment
Question by:Pennywisdom
[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
7 Comments
 
LVL 18

Accepted Solution

by:
bobbit31 earned 400 total points
ID: 6361318
0
 
LVL 3

Expert Comment

by:jrspano
ID: 6361321
0
 
LVL 3

Expert Comment

by:DennisL
ID: 6361466
Formula for a Line
x = ay + b

line 1:
x = 3y + 1

line 2:
x = 2y + 3

therefore:

3y + 1 = 2y + 3

((3y - 2y) = (3 - 1))

y = 2

x = 3(2) + 1
x = 7

The coordinates are x = 7, y = 2

The number beside the y controls the pitch.  And the other number controls the height above the x-axis (or y?).  

In terms of programming, you'll probably be able to do it all in one or two lines.  All you really need is the a and b and do some formula against it to get y, then get x.
0
Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 5

Expert Comment

by:jklmn
ID: 6361568
Hi Pennywisdom,

If your lines are controls, try this:

Private Sub Command1_Click()
k1 = (Line1.Y2 - Line1.Y1) / (Line1.X2 - Line1.X1)
c1 = Line1.Y1 - k1 * Line1.X1
k2 = (Line2.Y2 - Line2.Y1) / (Line2.X2 - Line2.X1)
c2 = Line2.Y1 - k2 * Line2.X1
x = (c2 - c1) / (k1 - k2)
y = k1 * x + c1
Print x, y
End Sub
0
 
LVL 3

Expert Comment

by:DennisL
ID: 6361588
Formula for a Line
x = ay + b

line 1:
x = 3y + 1

line 2:
x = 2y + 3

therefore:

3y + 1 = 2y + 3

((3y - 2y) = (3 - 1))

y = 2

x = 3(2) + 1
x = 7

The coordinates are x = 7, y = 2

The number beside the y controls the pitch.  And the other number controls the height above the x-axis (or y?).  

In terms of programming, you'll probably be able to do it all in one or two lines.  All you really need is the a and b and do some formula against it to get y, then get x.
0
 

Author Comment

by:Pennywisdom
ID: 6365156
Thanks alot thats exacly what I needed
0
 
LVL 18

Expert Comment

by:bobbit31
ID: 6365276
no prob, glad to help!
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

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

Introduction While answering a recent question about filtering a custom class collection, I realized that this could be accomplished with very little code by using the ScriptControl (SC) library.  This article will introduce you to the SC library a…
Have you ever wanted to restrict the users input in a textbox to numbers, and while doing that make sure that they can't 'cheat' by pasting in non-numeric text? Of course you can do that with code you write yourself but it's tedious and error-prone …
Get people started with the process of using Access VBA to control Outlook using automation, Microsoft Access can control other applications. An example is the ability to programmatically talk to Microsoft Outlook. Using automation, an Access applic…
Show developers how to use a criteria form to limit the data that appears on an Access report. It is a common requirement that users can specify the criteria for a report at runtime. The easiest way to accomplish this is using a criteria form that a…
Suggested Courses

610 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