/**
* Calculate a field of view from source at (x,y), pointing
* in the given direction and with the given angle. The larger
* the angle, the wider, "less focused" the beam. Each side of the
* line pointing in the direction from the source will be half the
* angle given such that the angle specified will be represented on
* the raster.
*
* \param settings data structure containing settings.
* \param map map data structure to be passed to callbacks.
* \param source data structure holding source of light.
* \param source_x x-axis coordinate from which to start.
* \param source_y y-axis coordinate from which to start.
* \param radius Euclidean distance from (x,y) after which to stop.
* \param direction One of eight directions the beam of light can point.
* \param angle The angle at the base of the beam of light, in degrees.
*/
public void fov_beam(fov_settings_type settings, map _map, Color source, int source_x, int source_y,
uint radius, fov_direction_type direction, float angle)
{
fov_private_data_type data = new fov_private_data_type();
float start_slope, end_slope, a;
data.settings = settings;
data._map = _map;
data.source = source;
data.source_x = source_x;
data.source_y = source_y;
data.radius = radius;
if (angle <= 0.0f)
{
return;
}
else if (angle >= 360.0f)
{
_fov_circle(data);
}
/* Calculate the angle as a percentage of 45 degrees, halved (for
* each side of the centre of the beam). e.g. angle = 180.0f means
* half the beam is 90.0 which is 2x45, so the result is 2.0.
*/
a = angle / 90.0f;
if (direction == fov_direction_type.FOV_EAST)
{
end_slope = betweenf(a, 0.0f, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_PPN, data, 1, 0.0f, end_slope);
_fov_octant_part(fov_octants_part.FOV_OCTANT_PMN, data, 1, 0.0f, end_slope);
if (a - 1.0f > Mathf.Epsilon)
{ /* a > 1.0f */
start_slope = betweenf(2.0f - a, 0.0f, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_PPY, data, 1, start_slope, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_MPY, data, 1, start_slope, 1.0f);
}
if (a - 2.0f > Mathf.Epsilon)
{ /* a > 2.0f */
end_slope = betweenf(a - 2.0f, 0.0f, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_PMY, data, 1, 0.0f, end_slope);
_fov_octant_part(fov_octants_part.FOV_OCTANT_MMY, data, 1, 0.0f, end_slope);
}
if (a - 3.0f > Mathf.Epsilon)
{ /* a > 3.0f */
start_slope = betweenf(4.0f - a, 0.0f, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_MPN, data, 1, start_slope, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_MMN, data, 1, start_slope, 1.0f);
}
}
if (direction == fov_direction_type.FOV_WEST)
{
end_slope = betweenf(a, 0.0f, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_MPN, data, 1, 0.0f, end_slope);
_fov_octant_part(fov_octants_part.FOV_OCTANT_MMN, data, 1, 0.0f, end_slope);
if (a - 1.0f > Mathf.Epsilon)
{ /* a > 1.0f */
start_slope = betweenf(2.0f - a, 0.0f, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_PMY, data, 1, start_slope, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_MMY, data, 1, start_slope, 1.0f);
}
if (a - 2.0f > Mathf.Epsilon)
{ /* a > 2.0f */
end_slope = betweenf(a - 2.0f, 0.0f, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_PPY, data, 1, 0.0f, end_slope);
_fov_octant_part(fov_octants_part.FOV_OCTANT_MPY, data, 1, 0.0f, end_slope);
}
if (a - 3.0f > Mathf.Epsilon)
{ /* a > 3.0f */
start_slope = betweenf(4.0f - a, 0.0f, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_PPN, data, 1, start_slope, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_PMN, data, 1, start_slope, 1.0f);
}
}
if (direction == fov_direction_type.FOV_NORTH)
{
end_slope = betweenf(a, 0.0f, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_MPY, data, 1, 0.0f, end_slope);
_fov_octant_part(fov_octants_part.FOV_OCTANT_MMY, data, 1, 0.0f, end_slope);
if (a - 1.0f > Mathf.Epsilon)
{ /* a > 1.0f */
start_slope = betweenf(2.0f - a, 0.0f, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_MMN, data, 1, start_slope, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_PMN, data, 1, start_slope, 1.0f);
}
if (a - 2.0f > Mathf.Epsilon)
{ /* a > 2.0f */
end_slope = betweenf(a - 2.0f, 0.0f, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_MPN, data, 1, 0.0f, end_slope);
_fov_octant_part(fov_octants_part.FOV_OCTANT_PPN, data, 1, 0.0f, end_slope);
}
if (a - 3.0f > Mathf.Epsilon)
{ /* a > 3.0f */
start_slope = betweenf(4.0f - a, 0.0f, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_PMY, data, 1, start_slope, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_PPY, data, 1, start_slope, 1.0f);
}
}
if (direction == fov_direction_type.FOV_SOUTH)
{
end_slope = betweenf(a, 0.0f, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_PMY, data, 1, 0.0f, end_slope);
_fov_octant_part(fov_octants_part.FOV_OCTANT_PPY, data, 1, 0.0f, end_slope);
if (a - 1.0f > Mathf.Epsilon)
{ /* a > 1.0f */
start_slope = betweenf(2.0f - a, 0.0f, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_MPN, data, 1, start_slope, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_PPN, data, 1, start_slope, 1.0f);
}
if (a - 2.0f > Mathf.Epsilon)
{ /* a > 2.0f */
end_slope = betweenf(a - 2.0f, 0.0f, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_MMN, data, 1, 0.0f, end_slope);
_fov_octant_part(fov_octants_part.FOV_OCTANT_PMN, data, 1, 0.0f, end_slope);
}
if (a - 3.0f > Mathf.Epsilon)
{ /* a > 3.0f */
start_slope = betweenf(4.0f - a, 0.0f, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_MMY, data, 1, start_slope, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_MPY, data, 1, start_slope, 1.0f);
}
}
if (direction == fov_direction_type.FOV_NORTHEAST)
{
start_slope = betweenf(1.0f - a, 0.0f, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_PMN, data, 1, start_slope, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_MPY, data, 1, start_slope, 1.0f);
if (a - 1.0f > Mathf.Epsilon)
{ /* a > 1.0f */
end_slope = betweenf(a - 1.0f, 0.0f, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_MMY, data, 1, 0.0f, end_slope);
_fov_octant_part(fov_octants_part.FOV_OCTANT_PPN, data, 1, 0.0f, end_slope);
}
if (a - 2.0f > Mathf.Epsilon)
{ /* a > 2.0f */
start_slope = betweenf(3.0f - a, 0.0f, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_MMN, data, 1, start_slope, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_PPY, data, 1, start_slope, 1.0f);
}
if (a - 3.0f > Mathf.Epsilon)
{ /* a > 3.0f */
end_slope = betweenf(a - 3.0f, 0.0f, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_MPN, data, 1, 0.0f, end_slope);
_fov_octant_part(fov_octants_part.FOV_OCTANT_PMY, data, 1, 0.0f, end_slope);
}
}
if (direction == fov_direction_type.FOV_NORTHWEST)
{
start_slope = betweenf(1.0f - a, 0.0f, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_MMN, data, 1, start_slope, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_MMY, data, 1, start_slope, 1.0f);
if (a - 1.0f > Mathf.Epsilon)
{ /* a > 1.0f */
end_slope = betweenf(a - 1.0f, 0.0f, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_MPN, data, 1, 0.0f, end_slope);
_fov_octant_part(fov_octants_part.FOV_OCTANT_MPY, data, 1, 0.0f, end_slope);
}
if (a - 2.0f > Mathf.Epsilon)
{ /* a > 2.0f */
start_slope = betweenf(3.0f - a, 0.0f, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_PMY, data, 1, start_slope, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_PMN, data, 1, start_slope, 1.0f);
}
if (a - 3.0f > Mathf.Epsilon)
{ /* a > 3.0f */
end_slope = betweenf(a - 3.0f, 0.0f, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_PPY, data, 1, 0.0f, end_slope);
_fov_octant_part(fov_octants_part.FOV_OCTANT_PPN, data, 1, 0.0f, end_slope);
}
}
if (direction == fov_direction_type.FOV_SOUTHEAST)
{
start_slope = betweenf(1.0f - a, 0.0f, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_PPN, data, 1, start_slope, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_PPY, data, 1, start_slope, 1.0f);
if (a - 1.0f > Mathf.Epsilon)
{ /* a > 1.0f */
end_slope = betweenf(a - 1.0f, 0.0f, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_PMY, data, 1, 0.0f, end_slope);
_fov_octant_part(fov_octants_part.FOV_OCTANT_PMN, data, 1, 0.0f, end_slope);
}
if (a - 2.0f > Mathf.Epsilon)
{ /* a > 2.0f */
start_slope = betweenf(3.0f - a, 0.0f, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_MPN, data, 1, start_slope, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_MPY, data, 1, start_slope, 1.0f);
}
if (a - 3.0f > Mathf.Epsilon)
{ /* a > 3.0f */
end_slope = betweenf(a - 3.0f, 0.0f, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_MMN, data, 1, 0.0f, end_slope);
_fov_octant_part(fov_octants_part.FOV_OCTANT_MMY, data, 1, 0.0f, end_slope);
}
}
if (direction == fov_direction_type.FOV_SOUTHWEST)
{
start_slope = betweenf(1.0f - a, 0.0f, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_PMY, data, 1, start_slope, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_MPN, data, 1, start_slope, 1.0f);
if (a - 1.0f > Mathf.Epsilon)
{ /* a > 1.0f */
end_slope = betweenf(a - 1.0f, 0.0f, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_PPY, data, 1, 0.0f, end_slope);
_fov_octant_part(fov_octants_part.FOV_OCTANT_MMN, data, 1, 0.0f, end_slope);
}
if (a - 2.0f > Mathf.Epsilon)
{ /* a > 2.0f */
start_slope = betweenf(3.0f - a, 0.0f, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_PPN, data, 1, start_slope, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_MMY, data, 1, start_slope, 1.0f);
}
if (a - 3.0f > Mathf.Epsilon)
{ /* a > 3.0f */
end_slope = betweenf(a - 3.0f, 0.0f, 1.0f);
_fov_octant_part(fov_octants_part.FOV_OCTANT_PMN, data, 1, 0.0f, end_slope);
_fov_octant_part(fov_octants_part.FOV_OCTANT_MPY, data, 1, 0.0f, end_slope);
}
}
}
