How do I find a coordinate in my game (trigonometry question)?

Question

1.00/5 (1 vote)

See more:

Hi,

I am trying to find the X and Y coordinates of a certain point in my game.

I have a starting point ("origo"), I have the length of my object (in pixels), and I have the rotation of the object.

In other words: if the object would be lying on the ground the X point would be origo + the length of the object, and the Y point would be the same as origo.

But what if the object is tilted say 55 degrees? I'm trying to locate the nearest X and Y position of where this object points then.

The reason why I ask is that I am creating a game with a cannon and shots that should be fired at this position, not from the middle of the object.

Thanks for any suggestions!

Petter

What I have tried:

I have looked at the sinus, cosinus, and tangent math formulas, but don't think they are applicable, and in any case I don't know how to write this in C#.

Posted 7-Aug-16 0:23am

petter2012

Updated 7-Aug-16 1:02am

v3

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

petter2012 · Answer 1 · 2016-08-07T01:02:00

Solution 1

I came up with the solution myself. When I drew the line, angle, and the coordiante system I saw that opposite the length of the object, the corresponding angle is always 90 degrees.

Thus, I have a 90 degree angle, a known angle, and one of the two lines' length.
This means that I can use the law of sines.

I hope this helps anyone in the same situation.

Petter

Posted 7-Aug-16 1:02am

petter2012

Comments

Patrice T 7-Aug-16 9:03am

nice to see you found the answer.
Use Accept answer to close the question.