def _render_blank_page(self, ctx, cairo_surface, dpi):
"""
Render a blank page with a nice "intentionally blank" notice
"""
ctx.save()
ctx.translate(
commons.convert_pt_to_dots(Renderer.PRINT_SAFE_MARGIN_PT),
commons.convert_pt_to_dots(Renderer.PRINT_SAFE_MARGIN_PT))
# footer notice
w = self._usable_area_width_pt
h = self._usable_area_height_pt
ctx.set_source_rgb(.6,.6,.6)
draw_utils.draw_simpletext_center(ctx, _('This page is intentionally left '\
'blank.'), w/2.0, 0.95*h)
draw_utils.render_page_number(ctx, 2,
self._usable_area_width_pt,
self._usable_area_height_pt,
self.grayed_margin_pt,
transparent_background=False)
try: # set_page_label() does not exist in older pycairo versions
cairo_surface.set_page_label(_(u'Blank'))
except:
pass
cairo_surface.show_page()
ctx.restore()
def _draw_labels(ctx, map_grid,
map_area_width_dots, map_area_height_dots,
grid_legend_margin_dots):
"""
Draw the Grid labels at current position.
Args:
ctx (cairo.Context): The cairo context to use to draw.
map_grid (Grid): the grid objects whose labels we want to draw.
map_area_width_dots/map_area_height_dots (numbers): size of the
map (cairo units).
grid_legend_margin_dots (number): margin between border of
map and grid labels (cairo units).
"""
ctx.save()
step_horiz = map_area_width_dots / map_grid.horiz_count
last_horiz_portion = math.modf(map_grid.horiz_count)[0]
step_vert = map_area_height_dots / map_grid.vert_count
last_vert_portion = math.modf(map_grid.vert_count)[0]
ctx.set_font_size(min(0.75 * grid_legend_margin_dots,
0.5 * step_horiz))
for i, label in enumerate(map_grid.horizontal_labels):
x = i * step_horiz
if i < len(map_grid.horizontal_labels) - 1:
x += step_horiz/2.0
elif last_horiz_portion >= 0.3:
x += step_horiz * last_horiz_portion/2.0
else:
continue
draw_utils.draw_simpletext_center(ctx, label,
x, grid_legend_margin_dots/2.0)
draw_utils.draw_simpletext_center(ctx, label,
x, map_area_height_dots -
grid_legend_margin_dots/2.0)
for i, label in enumerate(map_grid.vertical_labels):
y = i * step_vert
if i < len(map_grid.vertical_labels) - 1:
y += step_vert/2.0
elif last_vert_portion >= 0.3:
y += step_vert * last_vert_portion/2.0
else:
continue
draw_utils.draw_simpletext_center(ctx, label,
grid_legend_margin_dots/2.0, y)
draw_utils.draw_simpletext_center(ctx, label,
map_area_width_dots -
grid_legend_margin_dots/2.0, y)
ctx.restore()
def _render_blank_page(self, ctx, cairo_surface, dpi):
"""
Render a blank page with a nice "intentionally blank" notice
"""
ctx.save()
ctx.translate(
commons.convert_pt_to_dots(Renderer.PRINT_SAFE_MARGIN_PT),
commons.convert_pt_to_dots(Renderer.PRINT_SAFE_MARGIN_PT))
# footer notice
w = self._usable_area_width_pt
h = self._usable_area_height_pt
ctx.set_source_rgb(.6,.6,.6)
draw_utils.draw_simpletext_center(ctx, _('This page is intentionally left '\
'blank.'), w/2.0, 0.95*h)
draw_utils.render_page_number(ctx, 2,
self._usable_area_width_pt,
self._usable_area_height_pt,
self.grayed_margin_pt,
transparent_background=False)
cairo_surface.show_page()
ctx.restore()
def _draw_labels(ctx, map_grid, map_area_width_dots, map_area_height_dots,
grid_legend_margin_dots):
"""
Draw the Grid labels at current position.
Args:
ctx (cairo.Context): The cairo context to use to draw.
map_grid (Grid): the grid objects whose labels we want to draw.
map_area_width_dots/map_area_height_dots (numbers): size of the
map (cairo units).
grid_legend_margin_dots (number): margin between border of
map and grid labels (cairo units).
"""
ctx.save()
step_horiz = map_area_width_dots / map_grid.horiz_count
last_horiz_portion = math.modf(map_grid.horiz_count)[0]
step_vert = map_area_height_dots / map_grid.vert_count
last_vert_portion = math.modf(map_grid.vert_count)[0]
ctx.set_font_size(min(0.75 * grid_legend_margin_dots,
0.5 * step_horiz))
for i, label in enumerate(map_grid.horizontal_labels):
x = i * step_horiz
if i < len(map_grid.horizontal_labels) - 1:
x += step_horiz / 2.0
elif last_horiz_portion >= 0.3:
x += step_horiz * last_horiz_portion / 2.0
else:
continue
# At the top clear the right corner of the horizontal label
if (i < map_grid.horiz_count - 1):
draw_utils.draw_simpletext_center(
ctx, label, x, grid_legend_margin_dots / 2.0)
# At the bottom clear the left corner of the horizontal label
if (i > 0):
draw_utils.draw_simpletext_center(
ctx, label, x,
map_area_height_dots - grid_legend_margin_dots / 2.0)
for i, label in enumerate(map_grid.vertical_labels):
y = i * step_vert
if i < len(map_grid.vertical_labels) - 1:
y += step_vert / 2.0
elif last_vert_portion >= 0.3:
y += step_vert * last_vert_portion / 2.0
else:
continue
# On the left clear the upper corner of the vertical label
if (i > 0):
draw_utils.draw_simpletext_center(
ctx, label, grid_legend_margin_dots / 2.0, y)
# On the right clear the bottom corner of the vertical label
if (i < map_grid.vert_count - 1):
draw_utils.draw_simpletext_center(
ctx, label,
map_area_width_dots - grid_legend_margin_dots / 2.0, y)
ctx.restore()
def show_grid(lat1, lon1, lat2, lon2):
# draw grid over given bounding box
if (lat1 > 0 and lat2 < 0):
# split into two grids when bbox crosses the equator
show_grid(lat1, lon1, 0.000001, lon2)
show_grid(-0.000001, lon1, lat2, lon2)
return
# determine default UTM coordinates for bounding box corners
(west, north, zone1_number, zone1_letter) = utm.from_latlon(lat1, lon1)
(east, south, zone2_number, zone2_letter) = utm.from_latlon(lat2, lon2)
# exclude the polar zones for now
# TODO: add support for polar zones
polar_zones = ['A', 'B', 'Y', 'Z']
if zone1_letter in polar_zones or zone2_letter in polar_zones:
LOG.warning('No support for UTM polar zones yet')
return
# split into two grids when bbox crosses a zone border
if zone1_number != zone2_number:
# TODO: handle special cases for Sweden/Norway and Spitzbergen
# zone fileds 32N-V, 32N-X to 37N-X
split_lon = int(math.floor(lon2 / 6)) * 6
show_grid(lat1, lon1, lat2, split_lon - 0.000001)
show_grid(lat1, split_lon + 0.000001, lat2, lon2)
return
# determine grid bounding box pixel coordinates
(x1, y1) = renderer._latlon2xy(lat1, lon1)
(x2, y2) = renderer._latlon2xy(lat2, lon2)
# clip to grid bounding box
ctx.save()
ctx.rectangle(x1, y1, x2, y2)
ctx.clip()
# we only need one line every kilometer, so we can round things up or down
w_km = math.floor(west / 1000)
e_km = math.ceil(east / 1000)
n_km = math.ceil(north / 1000)
s_km = math.floor(south / 1000)
# draw the vertical grid lines
for v in range(w_km, e_km):
# calc line endings and draw line
# TODO: the vertical lines are not really straight
(lat1, lon1) = utm.to_latlon(v * 1000, n_km * 1000, zone1_number,
zone1_letter)
(lat2, lon2) = utm.to_latlon(v * 1000, s_km * 1000, zone1_number,
zone1_letter)
grid_line(lat1, lon1, lat2, lon2)
# draw easting value right next to upper visible end of the grid line
(x1, y1) = renderer._latlon2xy(lat1, lon1)
ctx.save()
ctx.set_source_rgba(0, 0, 0.5, 0.5)
draw_simpletext_center(ctx, beautify_km(v), x1 + 12, 62.5)
ctx.restore()
# draw the horizontal grid lines
for h in range(s_km, n_km):
# calc line endings and draw line
(lat1, lon1) = utm.to_latlon(w_km * 1000, h * 1000, zone1_number,
zone1_letter)
(lat2, lon2) = utm.to_latlon(e_km * 1000, h * 1000, zone1_number,
zone1_letter)
grid_line(lat1, lon1, lat2, lon2)
# draw northing value right below left visible end of the line
(x1, y1) = renderer._latlon2xy(lat1, lon1)
ctx.save()
ctx.set_source_rgba(0, 0, 0.5, 0.5)
draw_simpletext_center(ctx, beautify_km(h), 27, y1 + 5)
ctx.restore()
# draw zone field info in upper left map corner
# TODO avoid overlap with northing/easting values
ctx.set_source_rgba(0, 0, 0.5, 0.5)
draw_simpletext_center(ctx, ("%d%s" % (zone1_number, zone1_letter)),
27, 20)
ctx.restore()
