Solved

The tale of two lines

Posted on 2001-08-07
7
141 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
7 Comments
 
LVL 18

Accepted Solution

by:
bobbit31 earned 100 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
Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

 
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

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
VBA error replacing data 6 40
Added a column screws up code 5 63
IF ELSE Statement in Excel Macro VBA 16 75
Problem to line 23 53
Introduction I needed to skip over some file processing within a For...Next loop in some old production code and wished that VB (classic) had a statement that would drop down to the end of the current iteration, bypassing the statements that were c…
Introduction In a recent article (http://www.experts-exchange.com/A_7811-A-Better-Concatenate-Function.html) for the Excel community, I showed an improved version of the Excel Concatenate() function.  While writing that article I realized that no o…
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…
Get people started with the process of using Access VBA to control Excel using automation, Microsoft Access can control other applications. An example is the ability to programmatically talk to Excel. Using automation, an Access application can laun…

808 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