Math Question(s)...

[Aino]

How do I find an angle in a circle? I have been wondering for ages...

I might update this topic as I need more help

[Pilchard123]

With a protractor...?

I'm guessing you want more help than that, though. What exactly do you want doing?

[Aino]

Just so I know before using it But what is an protractor (Explain in simplicity please

[Sniped50]

A protractor is a plastic semi-circle (or circle) with markings on it to indicate an angle, e.g. halfway between the 50 and 60 marks shows it's an angle of 55^o. It's pretty difficult to use with a computer monitor, though (just in case you attempt it ).

And, yes, we do need a bit more information as to what exactly you are planning. Not world domination, is it?

[Aino]

It is world domination No... I am going to make 2 circles bind, but the other one hangs on at one point...

[Aino]

Wow, *searching for "protractor" in google, finding pictures and then feeling dumb*... Found out that you can use pi though, but how do I make an angle a startting point:


I think that helps the understanding... I know how to get around the circle now, but not how to set the starting angle...

[annikk.exe]

What you are looking for, I think, is the "tangent" of the circle.


Suppose you draw any line from the center of the circle, to the outside of the circle.  A tangent line is always at 90° to that line.





A tangent line is recogniseable because it only just touches the circle at one point, whereas any other type of line crosses the circle in 2 places or doesn't cross it at all:





Let me know if this help you at all.  If not, please can you explain what it is you're trying to do in your level.  That will help me a lot in understanding what you need.  :>

[Aino]

Was going to make something diferent from Eufloria, you were going to live as a fast evolving cell that could conect parts together, but the knowledge of how to find the 90° of a circle is useful at any time as a programmer Well, I don't know if it solves it, but

Suppose you draw any line from the center of the circle, to the outside of the circle.  A tangent line is always at 90° to that line.

says something about what I am looking for, but after looking at

A tangent line is recogniseable because it only just touches the circle at one point, whereas any other type of line crosses the circle in 2 places or doesn't cross it at all:

it confuses me a little...

[Aino]

So, I think I finally figured this out, using sin() and cos(), cause at 0 they are at the 90° on a circle, so I can add and remove from there: Using purely sin and cos... So thats what I was looking for, to bad the plans are gone :/

(But I might use it in the future )

[Aino]

Got a new one, which annikk can answer, which goes like this:

Finding and exit angle, or collision point or whatever you call it... It is the point where two objects collide if you know what I am saying... But this might not be fitting to what I am looking for.

I am looking for something to find an angle pointing from my mouse, or simplier said: Let's say that we have an arrow pointing to the center of the screen from the mouse, but how do you achive this(this is no litterally, I mean how to find that angle!)?

And if you wonder what I am making to need this is a shooting game... so I'll need to find out which way the bullets are going to go...

Hope you understood, else I can poste some pictures

EDIT: Uploaded the file, you can play it yourself and see.

The bullets are slower the closer you are to the player unit: I used the equation(x(unit) - x(mouse)/something) and the same with the y axis, so it creates more speed the further away you are cause the distance is larger,but I need something that is constant.

and the controls by the way is:

Left Click(Hold) = shoot
Right Click(Hold) = walk/run(depends on dist between unit and mouse)
/EDIT