Problem With Angles

where Ø is the angle

∆X=cos(Ø)∆Y=sin(Ø)

Hmm, ive tried that and I must be doing something wrong. Here's the line of code I am using:

Rect->Set_Position(Rect->myX plus (float) cos(90), Rect->myY plus (float) sin(90));

Change the word plus to a plus sign, for some reason it filtered that character. If I understand this correctly, depending on which way the coordinates of the screen are oriented with angles, it should go either straight up, down, left or right. It actually did none of those, it went in sort of a south south west angle. I could be doing something completely wrong. Oh BTW, the Set_Position function takes two arguements, x and y and in that order. This just sets the position of the object. Thanks guys.

c++ math functions work with radians, not degrees. (I assume this is c++.)

Also, although +'s are for some reason filtered in the preview, they actually show up in the post :-)

Ahhh, I bet that's what I'm doing wrong. Let me try that out and I'll let you know what happens. Thanks!

That works, awesome! I tried finding some documentation on the cos and sin methods but was short on information. I was about to pull my hair out. Thanks a million.

Just as reference for others in the future:

1 degree = 0.0174532925 Radians

#define DEG2RAD(a) ((a)*PI/180)
#define RAD2DEG(a) ((a)*180/PI)

Although I don't see any way that specific macro could be bad (I'm sure the gurus will find some) I prefer to multiply by:
const float DegToRadf = whatever

Quote:

#define fPI 3.14156f #define fDEG2RAD(a) ((a)*fPI/180.0f) #define fRAD2DEG(a) ((a)*180.0f/fPI) #define dPI 3.14156 #define dDEG2RAD(a) ((a)*dPI/180.0) #define dRAD2DEG(a) ((a)*180.0/dPI)

If you used 180, it would cast the answer to an integer.
Does this mean I'm a finally a guru? =)

In this instance, the type coercion happens to work out okay (except for certain very large, unusual, and well-chosen angles). That's purely a matter of luck, though.