How do I find between two pixcel angle

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C#

Hi.How do I find angle between two pixcels...

Posted 29-Jan-14 5:22am

Onur Çil

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austinbox 29-Jan-14 11:29am

Well if you want the angle between the two pixels you can use Math.atan2.
For example:

double angleInDegrees = Math.Atan2(pix2.y - pix1.y, pix2.x - pix1.x) * (180 / Math.PI);

Adam Zgagacz 29-Jan-14 11:31am

Can you be more specific? Pixel as most people understand it is a dot/point. I dont see what could be an angle in this case. How do you define an angel beteen two pixels?

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OriginalGriff · Answer 1 · 2014-01-29T05:28:00

Solution 1

Try:

C#

Point p1 = new Point(100, 100);
Point p2 = new Point(150, 50);
double radians = Math.Atan2(p2.Y - p1.Y, p2.X - p1.X);

Posted 29-Jan-14 5:28am

OriginalGriff

Comments

Rahul VB 29-Jan-14 12:27pm

that great OG, how have you been?

OriginalGriff 29-Jan-14 13:55pm

Not too bad - a little disappointed with tonights food, but...it was a new recipe, and I won't do it again! I did wonder just how risotto was going to work in the Sous Vide and now I know. Not so much "risotto" as "chicken, mushroom and rice soup". :sigh:
Yourself?

Rahul VB 29-Jan-14 21:17pm

great i just had some chapattis with Egg curry. Its cold here, dint feel like going out. Other wise i thought of getting some wine too. But never the less, we always have week ends to full fill our dreams. :) hahah

Ahmed Bensaid · Answer 2 · 2014-01-29T05:34:00

Solution 3

Google is your friend ;)
There is a lot of resources about that online.
For example : http://cplus.about.com/od/learnc/a/Calculating-The-Relative-Angle-Between-Two-Points.htm[^]

Posted 29-Jan-14 5:34am

Ahmed Bensaid

phil.o · Answer 3 · 2014-01-29T05:29:00

Solution 2

That makes no sense : there is no angle between two pixels.
You need at least 3 pixels, which could define two segments; you can then measure an angle between these segments.

Please clarify your question.

Posted 29-Jan-14 5:29am

phil.o

Comments

OriginalGriff 29-Jan-14 11:35am

Think in terms of two pixels on a bitmap: they both have an X and Y coordinate, so they have a relative angle within the framework:
If one is (0,0) and the other is (100,100) then the angle is at 45 degrees to the baseline X and Y axes.

phil.o 29-Jan-14 11:45am

Maybe I remind too much about my mathematics courses :)
Or maybe I just do not like making assumptions about OP's needs. Here the 45° example is working; but what about (0,0) and (87,134)? Does he want the angle with X or Y axis? As they clearly cannot equal each other.