/// <summary>Prepares this matrix for interpolation with the given one.</summary>
public void PrepareForInterpolate(InterpolationMatrix b)
{
// 20.2.2
Vector2 scaleA = Scale;
Vector2 scaleB = b.Scale;
float angleAi = Angle;
float angleBi = b.Angle;
float angleA = angleAi;
float angleB = angleBi;
if ((scaleA.x < 0f && scaleB.y < 0f) || (scaleA.y < 0f && scaleB.x < 0f))
{
scaleA.x = -scaleA.x;
scaleA.y = -scaleA.y;
angleA += angleA < 0f ? 180f : -180f;
// Write out scale:
Scale = scaleA;
}
// Don't rotate the long way around.
if (angleA == 0f)
{
angleA = 360f;
}
if (angleB == 0f)
{
angleB = 360f;
}
if (Math.Abs(angleA - angleB) > 180f)
{
if (angleA > angleB)
{
angleA -= 360f;
}
else
{
angleB -= 360f;
}
}
// Write out angles:
if (angleAi != angleA)
{
Angle = angleA;
}
if (angleBi != angleB)
{
b.Angle = angleB;
}
}
protected override Css.Value Clone()
{
InterpolationMatrix result = new InterpolationMatrix(Matrix_);
return(result);
}