[F8] Trig

[the n00b]

Why does my program think

Math.sin(45)

equal 0.850903524534118?
I want it to equal one like it should.

[the n00b]

Does it measure it in radians? If so how do you change it to degrees?

[the n00b]

This is the code that I am using:

this.exdisx = (Math.cos(this.dis2) * this.disc2)
this.exdisy = (Math.sin(this.dis2) * this.disc2)

this.dis2 is the angle of the triangle, and disc2 is the hypotenuse. But it doesn't work. I'm using these points as x and y cordinates of an MC and all it does is go in seemingly random places when I change dis2 and disc.

[dmonkey]

Hi,

Yes, Flash uses radians when calculating angles, but degrees when rotating objects (go figure). Use these handy functions to convert from deg to rad (and vice versa):

code:

---

function degToRad(a:Number):Number {

	return a * Math.PI / 180;

}



function radToDeg(a:Number):Number {

	return a * 180 / Math.PI;

}

---

Incidentally, sin(45) is actually 1 / sqrt(2), or 0.707106781186547:

code:

---

trace( Math.sin(degToRad(45)) );

---

Feel free to rename the functions to whatever you want.

Hope this helps.

[the n00b]

Hi,

Yes, Flash uses radians when calculating angles, but degrees when rotating objects (go figure). Use these handy functions to convert from deg to rad (and vice versa):

code:

---

function degToRad(a:Number):Number {

	return a * Math.PI / 180;

}



function radToDeg(a:Number):Number {

	return a * 180 / Math.PI;

}

---

Incidentally, sin(45) is actually 1 / sqrt(2), or 0.707106781186547:

code:

---

trace( Math.sin(degToRad(45)) );

---

Feel free to rename the functions to whatever you want.

Hope this helps.

So how do I put your code into this code:

this.exdisx = (Math.cos(this.dis2) * this.disc2)
this.exdisy = (Math.sin(this.dis2) * this.disc2)

[dmonkey]

Well instead of

code:

---

Math.cos(this.dis2);

---

you would write

code:

---

Math.cos( degToRad(this.dis2) );

---

As long as this.dis2 is measured in degrees, this should give you the required result. How is this.dis2 defined?

[the n00b]

Well instead of

code:

---

Math.cos(this.dis2);

---

you would write

code:

---

Math.cos( degToRad(this.dis2) );

---

As long as this.dis2 is measured in degrees, this should give you the required result. How is this.dis2 defined?

this.dis2 is a angle measured in degrees from 1 to 45, in a right triangle. "this.disc" is the hyposetunse of this right triangle. I want the sine and cosine of this angle displayed in degrees so I can use it to find the lengths of the legs of the right triangle. I don't really care about radiens, I don't know what they do. And I don't have much experience with the fuction command. I've only used it in one situation.

[dmonkey]

Hi,

I'm afraid you have to use radians. All I'm doing is doing a conversion from degrees to radians in the code. If you don't want to use a function, then just do the following:

code:

---

//Convert from degrees to radians

this.dis2 = this.dis2 * Math.PI / 180;



//Calculate

this.exdisx = (Math.cos(this.dis2) * this.disc2);

this.exdisy = (Math.sin(this.dis2) * this.disc2);

---

[the n00b]

Hi,

I'm afraid you have to use radians. All I'm doing is doing a conversion from degrees to radians in the code. If you don't want to use a function, then just do the following:

code:

---

//Convert from degrees to radians

this.dis2 = this.dis2 * Math.PI / 180;



//Calculate

this.exdisx = (Math.cos(this.dis2) * this.disc2);

this.exdisy = (Math.sin(this.dis2) * this.disc2);

---

Thank you so much. I was trying to convert the final product into radiens after I had already sine'd it. I didn't know I was suppose to convert it before, thx.

[BradFn]

Hey looky I've been banned for spamming