def plot_latitude(wcs, lon, lat, lat0, alpha=0.5):
lines_out = []
# Check if the point with coordinates (0, lat0) is inside the viewport
xpix, ypix = wcs_util.world2pix(wcs, 0., lat0)
if in_plot(wcs, xpix, ypix):
lon_min = 0.
inside = True
else:
inside = False
# Find intersections that correspond to latitude lat0
index = np.where(lat==lat0)
# Produce sorted array of the longitudes of all intersections
lonnew = np.sort(lon[index])
# Cycle through intersections
for l in lonnew:
# If inside, then current intersection closes arc - plot it
if(inside):
lon_max = l
x_world = math_util.complete_range(lon_min, lon_max, 360) # Plotting every degree, make more general
y_world = np.ones(len(x_world)) * lat0
x_pix, y_pix = wcs_util.world2pix(wcs, x_world, y_world)
lines_out.append(zip(x_pix, y_pix))
inside = False
else:
lon_min = l
inside = True
# If still inside when finished going through intersections, then close at longitude 360
if(inside):
lon_max = 360.
x_world = math_util.complete_range(lon_min, lon_max, 360)
y_world = np.ones(len(x_world)) * lat0
x_pix, y_pix = wcs_util.world2pix(wcs, x_world, y_world)
lines_out.append(zip(x_pix, y_pix))
inside = False
return lines_out
def plot_longitude(wcs, lon, lat, lon0, alpha=0.5):
lines_out = []
# Check if the point with coordinates (10., -90.) is inside the viewport
xpix, ypix = wcs_util.world2pix(wcs, 10., -90.)
if in_plot(wcs, xpix, ypix):
lat_min = -90.
inside = True
else:
inside = False
# Find intersections that correspond to longitude lon0
index = np.where(lon==lon0)
# Produce sorted array of the latitudes of all intersections
latnew = np.sort(lat[index])
# Cycle through intersections
for l in latnew:
if(inside):
lat_max = l
y_world = math_util.complete_range(lat_min, lat_max, 360)
x_world = np.ones(len(y_world)) * lon0
x_pix, y_pix = wcs_util.world2pix(wcs, x_world, y_world)
lines_out.append(zip(x_pix, y_pix))
inside = False
else:
lat_min = l
inside = True
if(inside):
lat_max = 90.
y_world = math_util.complete_range(lat_min, lat_max, 360)
x_world = np.ones(len(y_world)) * lon0
x_pix, y_pix = wcs_util.world2pix(wcs, x_world, y_world)
lines_out.append(zip(x_pix, y_pix))
inside = False
return lines_out
def _update_norefresh(self, *args):
if not self._active:
return self.ax
if len(args) == 1:
if id(self.ax) <> id(args[0]):
raise Exception("ax ids should match")
lines = []
if self.x_auto_spacing:
if self.ax.xaxis.apl_auto_tick_spacing:
xspacing = default_spacing(self.ax, 'x', self.ax.xaxis.apl_label_form).todegrees()
else:
xspacing = self.ax.xaxis.apl_tick_spacing.todegrees()
else:
xspacing = self.x_grid_spacing.todegrees()
if self.y_auto_spacing:
if self.ax.yaxis.apl_auto_tick_spacing:
yspacing = default_spacing(self.ax, 'y', self.ax.yaxis.apl_label_form).todegrees()
else:
yspacing = self.ax.yaxis.apl_tick_spacing.todegrees()
else:
yspacing = self.y_grid_spacing.todegrees()
# Find longitude lines that intersect with axes
lon_i, lat_i = find_intersections(self.wcs, 'x', xspacing)
lon_i_unique = np.array(list(set(lon_i)))
# Plot those lines
for l in lon_i_unique:
for line in plot_longitude(self.wcs, lon_i, lat_i, l):
lines.append(line)
# Find longitude lines that don't intersect with axes
lon_all = math_util.complete_range(0.0, 360.0, xspacing)
lon_ni = np.sort(np.array(list(set(lon_all)-set(lon_i_unique))))
lat_ni = np.ones(np.size(lon_ni)) # doesn't matter what value is, is either in or outside
if np.size(lon_ni) > 0:
xpix, ypix = wcs_util.world2pix(self.wcs, lon_ni, lat_ni)
# Plot those lines
# for i in range(0, np.size(lon_ni)):
# if(in_plot(wcs, xpix[i], ypix[i])):
# print "Inside longitude : "+str(lon_ni[i])
# plot_longitude(wcs, np.array([]), np.array([]), lon_ni[i])
# Find latitude lines that intersect with axes
lon_i, lat_i = find_intersections(self.wcs, 'y', yspacing)
lat_i_unique = np.array(list(set(lat_i)))
# Plot those lines
for l in lat_i_unique:
for line in plot_latitude(self.wcs, lon_i, lat_i, l):
lines.append(line)
# Find latitude lines that don't intersect with axes
lat_all = math_util.complete_range(-90.0, 90.0, yspacing)
lat_ni = np.sort(np.array(list(set(lat_all)-set(lat_i_unique))))
lon_ni = np.ones(np.size(lat_ni)) # doesn't matter what value is, is either in or outside
if np.size(lat_ni) > 0:
xpix, ypix = wcs_util.world2pix(self.wcs, lon_ni, lat_ni)
# Plot those lines
# for i in range(0, np.size(lat_ni)):
# if(in_plot(wcs, xpix[i], ypix[i])):
# print "Inside latitude : "+str(lat_ni[i])
# plot_latitude(wcs, np.array([]), np.array([]), lat_ni[i])
if self._grid:
self._grid.set_verts(lines)
else:
self._grid = LineCollection(lines, transOffset=self.ax.transData)
self.ax.add_collection(self._grid, False)
return self.ax
