//--------------------------------------------------------------------
public unsafe void Generate(RGBA_Bytes *span, int x, int y, uint len)
{
int dd = m_d2 - m_d1;
if (dd < 1)
{
dd = 1;
}
m_interpolator.Begin(x + 0.5, y + 0.5, len);
do
{
m_interpolator.Coordinates(out x, out y);
int d = m_gradient_function.Calculate(x >> downscale_shift,
y >> downscale_shift, m_d2);
d = ((d - m_d1) * (int)m_color_function.Size) / dd;
if (d < 0)
{
d = 0;
}
if (d >= (int)m_color_function.Size)
{
d = m_color_function.Size - 1;
}
*span++ = m_color_function[d];
m_interpolator.Next();
}while(--len != 0);
}
public int Calculate(int x, int y, int d)
{
int ret = m_gradient.Calculate(x, y, d) % d;
if (ret < 0)
{
ret += d;
}
return(ret);
}
public int Calculate(int x, int y, int d)
{
int d2 = d << 1;
int ret = m_gradient.Calculate(x, y, d) % d2;
if (ret < 0)
{
ret += d2;
}
if (ret >= d)
{
ret = d2 - ret;
}
return(ret);
}