ios - angle does not produce correct heading vector -

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in output vector, x , y values should negative when touchposition top right of player position.

given coordinate system increases upwards , right, starting @ bottom left, can see errors in code might problem?

double oppositelength = (touchposition.y - playerposition.y); double adjacentlength = (touchposition.x - playerposition.x); double hypotenuselength = (sqrt((oppositelength * oppositelength) + (adjacentlength * adjacentlength))); double angle = asin(oppositelength / hypotenuselength);  double mass = 0.0000013;  cgvector vector = cgvectormake(mass * cos(angle), mass * sin(angle));

here test output… (theta in radians):

o: -119.500000, a: 87.500000, h: 148.109757, theta: -0.938773439

...with vector…:

{7.680115295514375e-07, -1.0488843175016773e-06}

…when touchposition top right of player position.


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