def get_active_regions(self, look_dir, fovy_in_degrees, aspect):
'''
Computes the data necessary to determine which regions on the screen
are active. This should be produced once per frame and passed to
the getDataForActiveRegions method of all SkyRegionMap objects to
get the active regions for each map.
lookDir The direction the user is currently facing.
fovyInDegrees The field of view (in degrees).
aspect The aspect ratio of the screen.
Returns a data object containing data for quickly determining the
active regions.
'''
half_fovy = degrees_to_radians(fovy_in_degrees) / 2.0
screen_angle = math.asin(math.sin(half_fovy) * math.sqrt(1 + aspect * aspect))
angle_threshold = screen_angle + self.REGION_COVERAGE_ANGLE_IN_RADIANS
dot_product_threshold = math.cos(angle_threshold)
region_center_dot_products = [0] * len(self.REGION_CENTERS32)
active_standard_regions = []
i = 0
for i in range(len(self.REGION_CENTERS32)):
d_product = dot_product(look_dir, self.REGION_CENTERS32[i])
region_center_dot_products[i] = d_product
if d_product > dot_product_threshold:
active_standard_regions.append(i)
return ActiveRegionData(region_center_dot_products, \
screen_angle, active_standard_regions)
def get_active_regions(self, look_dir, fovy_in_degrees, aspect):
'''
Computes the data necessary to determine which regions on the screen
are active. This should be produced once per frame and passed to
the getDataForActiveRegions method of all SkyRegionMap objects to
get the active regions for each map.
lookDir The direction the user is currently facing.
fovyInDegrees The field of view (in degrees).
aspect The aspect ratio of the screen.
Returns a data object containing data for quickly determining the
active regions.
'''
half_fovy = degrees_to_radians(fovy_in_degrees) / 2.0
screen_angle = math.asin(
math.sin(half_fovy) * math.sqrt(1 + aspect * aspect))
angle_threshold = screen_angle + self.REGION_COVERAGE_ANGLE_IN_RADIANS
dot_product_threshold = math.cos(angle_threshold)
region_center_dot_products = [0] * len(self.REGION_CENTERS32)
active_standard_regions = []
i = 0
for i in range(len(self.REGION_CENTERS32)):
d_product = dot_product(look_dir, self.REGION_CENTERS32[i])
region_center_dot_products[i] = d_product
if d_product > dot_product_threshold:
active_standard_regions.append(i)
return ActiveRegionData(region_center_dot_products, \
screen_angle, active_standard_regions)
def get_object_region_data(self, gc_coords):
'''
returns the region a point belongs in, as well as the dot product of the
region center and the position. The latter is a measure of how close it
is to the center of the region (1 being a perfect match).
'''
data = self.ObjectRegionData()
i = 0
for i in range(len(self.REGION_CENTERS32)):
d_product = dot_product(self.REGION_CENTERS32[i], gc_coords)
if d_product > data.region_center_dot_product:
data.region_center_dot_product = d_product
data.region = i
return data
def get_object_region_data(self, gc_coords):
'''
returns the region a point belongs in, as well as the dot product of the
region center and the position. The latter is a measure of how close it
is to the center of the region (1 being a perfect match).
'''
data = self.ObjectRegionData()
i = 0
for i in range(len(self.REGION_CENTERS32)):
d_product = dot_product(self.REGION_CENTERS32[i], gc_coords)
if d_product > data.region_center_dot_product:
data.region_center_dot_product = d_product
data.region = i
return data
