Cosine/Sine problems

Question

I was writing some code for a simple game, and at the moment the focus is getting the character to move. To "strafe" to the right, I have used the following method:
public void moveRight() {
          double tempAngle = horizAngle - 90.0;
          location.setX(location.getX() + (Math.cos(tempAngle) * runSidewaySpeed));
          location.setY(location.getY() + (Math.sin(tempAngle) * runSidewaySpeed));
}I used the following values for the first test:
double horizAngle = 0.0
double runSidewaySpeed = 2.0
And I centered the Location on (0, 0), the origin. If you do the math, activating this method should change the location to (0, 2). It does not, however. Instead it moves the character in the correct Y direction, but not far enough, and in the negative direction of the X, which isn't supposed to move at all.
I looked through the code, and I found the glitch. From what I've learned the Cosine of -90 (tempAngle's value) is 0. But when I use a System.out.println to check it, the program reveals that the cosine of -90 is -0.44807... Sine returned the same result.
What am I doing wrong? Or if there really is a problem with the Math.sin() / Math.cos(), and if so, can someone suggest an alternative?
EDIT: Never mind, I discovered my problem. The Cosine/Sine methods take radians, not degrees. The API is sort of deceiving.
"Returns the trigonometric cosine of an angle."
Message was edited by:
Goron40

Answer 1

EDIT: Never mind, I discovered my problem. The
Cosine/Sine methods take radians, not degrees. The
API is sort of deceiving.
"Returns the trigonometric cosine of an angle."How is that decieving? This is what it says:
cos
public static double cos(double a)
    Returns the trigonometric cosine of an angle. Special cases:
        * If the argument is NaN or an infinity, then the result is NaN.
    The computed result must be within 1 ulp of the exact result. Results must be semi-monotonic.
    Parameters:
        a - an angle, in radians.
    Returns:
        the cosine of the argument.Seems pretty clear to me.