def test_raster_warping():
lyrSrs = "+init=epsg:32630"
mapSrs = '+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs'
lyr = mapnik.Layer('dataraster', lyrSrs)
lyr.datasource = mapnik.Gdal(
file = '../data/raster/dataraster.tif',
band = 1,
)
sym = mapnik.RasterSymbolizer()
sym.colorizer = mapnik.RasterColorizer(mapnik.COLORIZER_DISCRETE, mapnik.Color(255,255,0))
rule = mapnik.Rule()
rule.symbols.append(sym)
style = mapnik.Style()
style.rules.append(rule)
_map = mapnik.Map(256,256, mapSrs)
_map.append_style('foo', style)
lyr.styles.append('foo')
_map.layers.append(lyr)
prj_trans = mapnik.ProjTransform(mapnik.Projection(mapSrs),
mapnik.Projection(lyrSrs))
_map.zoom_to_box(prj_trans.backward(lyr.envelope()))
im = mapnik.Image(_map.width,_map.height)
mapnik.render(_map, im)
# save a png somewhere so we can see it
save_data('test_raster_warping.png', im.tostring('png'))
imdata = im.tostring()
assert contains_word('\xff\xff\x00\xff', imdata)
def test_raster_with_alpha_blends_correctly_with_background():
WIDTH = 500
HEIGHT = 500
map = mapnik.Map(WIDTH, HEIGHT)
WHITE = mapnik.Color(255, 255, 255)
map.background = WHITE
style = mapnik.Style()
rule = mapnik.Rule()
symbolizer = mapnik.RasterSymbolizer()
symbolizer.scaling = mapnik.scaling_method.BILINEAR
rule.symbols.append(symbolizer)
style.rules.append(rule)
map.append_style('raster_style', style)
map_layer = mapnik.Layer('test_layer')
filepath = '../data/raster/white-alpha.png'
if 'gdal' in mapnik.DatasourceCache.instance().plugin_names():
map_layer.datasource = mapnik.Gdal(file=filepath)
map_layer.styles.append('raster_style')
map.layers.append(map_layer)
map.zoom_all()
mim = mapnik.Image(WIDTH, HEIGHT)
mapnik.render(map, mim)
save_data('test_raster_with_alpha_blends_correctly_with_background.png',
mim.tostring('png'))
imdata = mim.tostring()
# All white is expected
assert contains_word('\xff\xff\xff\xff', imdata)
def test_renders_with_agg():
sym = mapnik.GlyphSymbolizer("DejaVu Sans Condensed",
mapnik.Expression("'í'"))
sym.allow_overlap = True
sym.angle = mapnik.Expression("[azimuth]+90") #+90 so the top of the glyph points upwards
sym.size = mapnik.Expression("[value]")
sym.color = mapnik.Expression("'#ff0000'")
_map = create_map_and_append_symbolyzer(sym)
im = mapnik.Image(_map.width,_map.height)
mapnik.render(_map, im)
save_data('agg_glyph_symbolizer.png', im.tostring('png'))
assert contains_word('\xff\x00\x00\xff', im.tostring())
def test_dataraster_coloring():
srs = '+init=epsg:32630'
lyr = mapnik.Layer('dataraster')
if 'gdal' in mapnik.DatasourceCache.instance().plugin_names():
lyr.datasource = mapnik.Gdal(
file = '../data/raster/dataraster.tif',
band = 1,
)
lyr.srs = srs
_map = mapnik.Map(256,256, srs)
style = mapnik.Style()
rule = mapnik.Rule()
sym = mapnik.RasterSymbolizer()
# Assigning a colorizer to the RasterSymbolizer tells the later
# that it should use it to colorize the raw data raster
sym.colorizer = mapnik.RasterColorizer(mapnik.COLORIZER_DISCRETE, mapnik.Color("transparent"))
for value, color in [
( 0, "#0044cc"),
( 10, "#00cc00"),
( 20, "#ffff00"),
( 30, "#ff7f00"),
( 40, "#ff0000"),
( 50, "#ff007f"),
( 60, "#ff00ff"),
( 70, "#cc00cc"),
( 80, "#990099"),
( 90, "#660066"),
( 200, "transparent"),
]:
sym.colorizer.add_stop(value, mapnik.Color(color))
rule.symbols.append(sym)
style.rules.append(rule)
_map.append_style('foo', style)
lyr.styles.append('foo')
_map.layers.append(lyr)
_map.zoom_to_box(lyr.envelope())
im = mapnik.Image(_map.width,_map.height)
mapnik.render(_map, im)
# save a png somewhere so we can see it
save_data('test_dataraster_coloring.png', im.tostring('png'))
imdata = im.tostring()
# we have some values in the [20,30) interval so check that they're colored
assert contains_word('\xff\xff\x00\xff', imdata)
def test_renders_with_cairo():
if not mapnik.has_pycairo():
return
sym = mapnik.GlyphSymbolizer("DejaVu Sans Condensed",
mapnik.Expression("'í'"))
sym.allow_overlap = True
sym.angle = mapnik.Expression("[azimuth]+90") #+90 so the top of the glyph points upwards
sym.size = mapnik.Expression("[value]")
sym.color = mapnik.Expression("'#ff0000'")
_map = create_map_and_append_symbolyzer(sym)
from cStringIO import StringIO
import cairo
surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, 256, 256)
mapnik.render(_map, surface)
im = mapnik.Image.from_cairo(surface)
save_data('cairo_glyph_symbolizer.png', im.tostring('png'))
assert contains_word('\xff\x00\x00\xff', im.tostring())
def test_raster_with_alpha_blends_correctly_with_background():
WIDTH = 500
HEIGHT = 500
map = mapnik.Map(WIDTH, HEIGHT)
WHITE = mapnik.Color(255, 255, 255)
map.background = WHITE
style = mapnik.Style()
rule = mapnik.Rule()
symbolizer = mapnik.RasterSymbolizer()
#XXX: This fixes it, see http://trac.mapnik.org/ticket/759#comment:3
# (and remove comment when this test passes)
#symbolizer.scaling="bilinear_old"
rule.symbols.append(symbolizer)
style.rules.append(rule)
map.append_style('raster_style', style)
map_layer = mapnik.Layer('test_layer')
filepath = '../data/raster/white-alpha.png'
map_layer.datasource = mapnik.Gdal(file=filepath)
map_layer.styles.append('raster_style')
map.layers.append(map_layer)
map.zoom_all()
mim = mapnik.Image(WIDTH, HEIGHT)
mapnik.render(map, mim)
save_data('test_raster_with_alpha_blends_correctly_with_background.png',
mim.tostring('png'))
imdata = mim.tostring()
# All white is expected
assert contains_word('\xff\xff\xff\xff', imdata)