# Re: [Audyssey] game objects in memory

```ACk! I just noticed that there is an instance of 'direction' in the getY
method. This should be velocity. -eek! NOt sure how that got in there, but
there ya go! :)```
```
-Good thing I reread these! lol!

Smiles,

Cara :)
On Dec 11, 2010, at 10:22 AM, Cara Quinn wrote:

Hi Thomas;

These methods should all return normal vectors anyway, so you shouldn't need to
normalize. I just did a few tweaks as that's all they seem to need. changed z
to y for consistency. Let me know how it goes, K?…

Smiles,

Cara :)

On Dec 9, 2010, at 7:22 PM, Thomas Ward wrote:

Hi Cara,

Sure no problem. below is the functions I'm using to calculate the
angle and vector Mara will travel to reach her next coordinates on the
map. However, before you ask the reason the calculations don't have a
fps or time parameter that's because I assume 1 as the frames per
second which is a slow frame rate I know. Here goes.

// Name: GetDirection (double, double, double, double).
// Description: Calculates the angle between
//  two game objects.
// CQ
// will switch your z to y so i can think straight :)

float Calculate::GetDirection (double x1, double y1, double x2, double y2)
{

// CQ
// changing this so both subtractions are in the same order
// as this changes the result

// Subtract x1 from x2
double x = x2 - x1;

// Subtract y1 from y2

double y = y2 - y1;

// CQ
// this should be y over x

// Calculate theta by the arc tangent
// of -y/x

double theta = std::atan2 (y,x);

// Now, multiply theta by 180
// and divide by PI
double direction = (theta * 180) / PI;

// Return the direction
return (float)direction;
}

// Name: GetX(double, double, double).
// Description: Calculates the next possible x component.
float Calculate::GetX (double direction, double x, double velocity)
{

// Calculate the next x component by
// multiplying velocity by the cosine of
// direction*PI/180

// CQ
// switched this to cos and changed calculation slightly

x = velocity * std::cos ((direction * PI) / 180));

// Return the new x component
return (float)x;
}

// Name: GetY(double, double, double).
// Description: Calculates the next possible y component.
float Calculate::GetY (double direction, double y, double velocity)
{

// Calculate the next y component by
// multiplying velocity by the sine of
// direction*PI/180
y = velocity * std::sin ((direction * PI) / 180);

// Return the new y component
return (float)y;
}

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