private float getFingerSpacing(MotionEvent e)
{
float x = e.GetX(0) - e.GetX(1);
float y = e.GetY(0) - e.GetY(1);
return((float)Math.Sqrt(x * x + y * y));
}
public void getQuaternion(float[] quaternion, int offset)
{
if (offset + 4 > quaternion.Length)
{
throw new IllegalArgumentException("Not enough space to write the result");
}
float[] m = mHeadView;
float t = m[0] + m[5] + m[10];
float s, w, x, y, z;
if (t >= 0.0F)
{
s = (float)Math.Sqrt(t + 1.0F);
w = 0.5F * s;
s = 0.5F / s;
x = (m[9] - m[6]) * s;
y = (m[2] - m[8]) * s;
z = (m[4] - m[1]) * s;
}
else
{
if ((m[0] > m[5]) && (m[0] > m[10]))
{
s = (float)Math.Sqrt(1.0F + m[0] - m[5] - m[10]);
x = s * 0.5F;
s = 0.5F / s;
y = (m[4] + m[1]) * s;
z = (m[2] + m[8]) * s;
w = (m[9] - m[6]) * s;
}
else
{
if (m[5] > m[10])
{
s = (float)Math.Sqrt(1.0F + m[5] - m[0] - m[10]);
y = s * 0.5F;
s = 0.5F / s;
x = (m[4] + m[1]) * s;
z = (m[9] + m[6]) * s;
w = (m[2] - m[8]) * s;
}
else
{
s = (float)Math.Sqrt(1.0F + m[10] - m[0] - m[5]);
z = s * 0.5F;
s = 0.5F / s;
x = (m[2] + m[8]) * s;
y = (m[9] + m[6]) * s;
w = (m[4] - m[1]) * s;
}
}
}
quaternion[(offset + 0)] = x;
quaternion[(offset + 1)] = y;
quaternion[(offset + 2)] = z;
quaternion[(offset + 3)] = w;
}
/// <summary>
/// Three-dimensional data standardization method, which divides each
/// number by the root of the sum of squares of all numbers.
/// </summary>
/// <param name="vector">vector.</param>
public static void NormalizeVec3(float[] vector)
{
// This data has three dimensions(0,1,2)
float length = 1.0f / (float)Math.Sqrt(vector[0] * vector[0] + vector[1] * vector[1] + vector[2] * vector[2]);
vector[0] *= length;
vector[1] *= length;
vector[2] *= length;
}
/// <summary>
/// Return the previous distance between the two pointers forming the
/// gesture in progress.
/// </summary>
/// <returns>Previous distance between pointers in pixels.</returns>
public float GetPreviousSpan()
{
try
{
if (MPrevLen == -1)
{
float pvx = MPrevFingerDiffX;
float pvy = MPrevFingerDiffY;
MPrevLen = (float)Math.Sqrt(pvx * pvx + pvy * pvy);
}
return(MPrevLen);
}
catch (Exception e)
{
Console.WriteLine(e);
return(0);
}
}
public float GetCurrentSpan()
{
try
{
if (MCurrLen == -1)
{
float cvx = MCurrFingerDiffX;
float cvy = MCurrFingerDiffY;
MCurrLen = (float)Math.Sqrt(cvx * cvx + cvy * cvy);
}
return(MCurrLen);
}
catch (Exception e)
{
Console.WriteLine(e);
return(0);
}
}
/// <summary>
/// Return the previous distance between the two pointers forming the
/// gesture in progress.
/// </summary>
/// <returns>Previous distance between pointers in pixels.</returns>
public float GetPreviousSpan()
{
try
{
if (MPrevLen == -1)
{
float pvx = MPrevFingerDiffX;
float pvy = MPrevFingerDiffY;
MPrevLen = (float)Math.Sqrt(pvx * pvx + pvy * pvy);
}
return(MPrevLen);
}
catch (Exception e)
{
Methods.DisplayReportResultTrack(e);
return(0);
}
}
public float GetCurrentSpan()
{
try
{
if (MCurrLen == -1)
{
float cvx = MCurrFingerDiffX;
float cvy = MCurrFingerDiffY;
MCurrLen = (float)Math.Sqrt(cvx * cvx + cvy * cvy);
}
return(MCurrLen);
}
catch (Exception e)
{
Methods.DisplayReportResultTrack(e);
return(0);
}
}
public void getEulerAngles(float[] eulerAngles, int offset)
{
if (offset + 3 > eulerAngles.Length)
{
throw new IllegalArgumentException("Not enough space to write the result");
}
float yaw, roll, pitch = (float)Math.Asin(mHeadView[6]);
if ((float)Math.Sqrt(1.0F - mHeadView[6] * mHeadView[6]) >= GIMBAL_LOCK_EPSILON)
{
yaw = (float)Math.Atan2(-mHeadView[2], mHeadView[10]);
roll = (float)Math.Atan2(-mHeadView[4], mHeadView[5]);
}
else
{
yaw = 0.0F;
roll = (float)Math.Atan2(mHeadView[1], mHeadView[0]);
}
eulerAngles[(offset + 0)] = (-pitch);
eulerAngles[(offset + 1)] = (-yaw);
eulerAngles[(offset + 2)] = (-roll);
}