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Why time in Math.sin and Math.cos?
Hi there. I decided to learn something about practical trigonometry to improve my skill in expressions but I could not get why in Math.sin and Math.cos we use “time”, like Math.cos (time). I know we must get an angle, but I can’t find any relationship between time and angle. I confess I thought in a clock and related it to a circle, but I thought: “No, I am crazy.”
Could someone explain so why we use time in .cos and .sin?
Thanks!
Lord Scales
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3 Replies
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Well,
think of time as a variable that automatically gets incremented every frame.
If you want to animate the result of a Math.cos(), there simply is no easier way to do it than by using a derivative of time.
Of course nothing’s to stop you from calculating the value of another variable.
like:
a=degreesToRadians(rotation);
Math.cos(a);(remember Math wants it’s angles to be expressed in radians)
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Thank you!
Rounded, 1 radian = 57.3 -
2 * Math.PI radians = 360
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