Ad:

Java Discussion Thread
Unsolved
Views: 7521

Nov 17th, 2006

Calculating distance between pixels

Expand Post »

Hi,

Can someone tell me the code to calculate the distance between two pixel points.

If i enter Point(x1,y1) and Point(x2,y2) then i get length of the line between them (in pixels).

Thanks.

Similar Threads

school task help in Java
URGENT - Reading from txt file into a 2 dimension array in Java

anti_genius

Reputation Points: 10

Solved Threads: 0

Light Poster

Offline

27 posts
since Nov 2006

Permalink

Nov 17th, 2006

Re: Calculating distance between pixels

ever heard of Pythagoras' Theorem " a on power of two plus b on power of two equals to c on power of two"?
just example

(Toggle Plain Text)

(x1 - x2 ) = x           // your a
(y1 - y2) = y            // your b

if ( x < 0) then x * (-1)
if ( y < 0) then y * (-1)

x^2 + y^2 = z^2       // z is your c distance between pixels    this ^2 on power of two

then get square root

Last edited by peter_budo; Nov 17th, 2006 at 7:39 am.

peter_budo

Moderator

Featured Poster

Reputation Points: 2786

Solved Threads: 874

Code tags enforcer

Offline

6,659 posts
since Dec 2004

Permalink

Nov 17th, 2006

Re: Calculating distance between pixels

Click to Expand / Collapse Quote originally posted by peter_budo ...

ever heard of Pythagoras' Theorem " a on power of two plus b on power of two equals to c on power of two"?
just example
(Toggle Plain Text)
(x1 - x2 ) = x           // your a
(y1 - y2) = y            // your b

if ( x < 0) then x * (-1)
if ( y < 0) then y * (-1)

x^2 + y^2 = z^2       // z is your c distance between pixels    this ^2 on power of two

then get square root
(x1 - x2 ) = x // your a (y1 - y2) = y // your b if ( x < 0) then x * (-1) if ( y < 0) then y * (-1) x^2 + y^2 = z^2 // z is your c distance between pixels this ^2 on power of two then get square root

lleave out the multiplying with -1 : x^2 is eual to (-x)^2

p.bondam

Reputation Points: 10

Solved Threads: 0

Newbie Poster

Offline

17 posts
since Nov 2006

Permalink

Nov 17th, 2006

Re: Calculating distance between pixels

Click to Expand / Collapse Quote originally posted by p.bondam ...

lleave out the multiplying with -1 : x^2 is eual to (-x)^2

in other words :

double a = P.x - Q.x;
double b = P.y - Q.y;
double distance = Math.sqrt(a * a + b * b);

and on you go

p.bondam

Reputation Points: 10

Solved Threads: 0

Newbie Poster

Offline

17 posts
since Nov 2006

Permalink

Nov 17th, 2006

Re: Calculating distance between pixels

yeah that's correct forgot about it :mrgreen:

peter_budo

Moderator

Featured Poster

Reputation Points: 2786

Solved Threads: 874

Code tags enforcer

Offline

6,659 posts
since Dec 2004

Permalink

Nov 24th, 2006

Re: Calculating distance between pixels

Hi,

Thanks for your help. It worked.

Regards.

anti_genius

Reputation Points: 10

Solved Threads: 0

Light Poster

Offline

27 posts
since Nov 2006

This thread is more than three months old

No one has posted to this discussion for at least three months. Please let old threads die and do not reply to them unless you feel you have something new and valuable to contribute that absolutely must be added to make the discussion complete. Otherwise, please start a new thread in this forum instead.

Previous Thread in Java Forum Timeline: Convert an image to *.ico format

Next Thread in Java Forum Timeline: Adding mouse listener to a frame

DaniWeb Message

Cancel Changes

User Name
Password