kay_siegert

12-04-2002, 10:40 AM

i canīt figure out whats wrong :(

iīm trying to rotate an object about the origin(x=0, y=0).

to manage that i first tried to calculate the next x and the y coordinate for my object to move to.

NOTE: itīs only for one quadrant (where x and y are positive)!

onClipEvent(load){

// init

movingDegree=2;

_x=50;

_y=100;

}

onClipEvent(enterFrame){

// calculating radius and angle referring to my origin

a = Number(_x);

b = Number(_y);

r = Math.sqrt((a*a)+(b*b));

Angle = Math.atan(b/a)*180/Math.PI;

// works great so far

// now iīm increasing the angle (2 degrees)

// ... and calculate adjacent leg (nextX) and the opposite leg(nextY) that are the coordinates of my next point at the same time

nextAngle = Number(Angle+movingDegree);

nextX=Number(Math.cos(nextAngle)*r);

nextY=Number(Math.sin(nextAngle)*r);

}

i get a completely different result when i calculate it with my pocket calculator.

i donīt get it.

the file is attached.

thankful for any help,

k.

iīm trying to rotate an object about the origin(x=0, y=0).

to manage that i first tried to calculate the next x and the y coordinate for my object to move to.

NOTE: itīs only for one quadrant (where x and y are positive)!

onClipEvent(load){

// init

movingDegree=2;

_x=50;

_y=100;

}

onClipEvent(enterFrame){

// calculating radius and angle referring to my origin

a = Number(_x);

b = Number(_y);

r = Math.sqrt((a*a)+(b*b));

Angle = Math.atan(b/a)*180/Math.PI;

// works great so far

// now iīm increasing the angle (2 degrees)

// ... and calculate adjacent leg (nextX) and the opposite leg(nextY) that are the coordinates of my next point at the same time

nextAngle = Number(Angle+movingDegree);

nextX=Number(Math.cos(nextAngle)*r);

nextY=Number(Math.sin(nextAngle)*r);

}

i get a completely different result when i calculate it with my pocket calculator.

i donīt get it.

the file is attached.

thankful for any help,

k.