def test_render_layer_with_detector():
ds = mapnik.MemoryDatasource()
context = mapnik.Context()
context.push('Name')
f = mapnik.Feature(context, 1)
f['Name'] = 'poly'
f.geometry = mapnik.Geometry.from_wkt(
'POLYGON ((1 1, -1 1, -1 -1, 1 -1, 1 1))')
ds.add_feature(f)
s = mapnik.Style()
r = mapnik.Rule()
symb = mapnik.PolygonSymbolizer()
symb.fill = mapnik.Color('red')
r.symbols.append(symb)
s.rules.append(r)
lyr = mapnik.Layer('poly')
lyr.datasource = ds
lyr.styles.append('poly')
m = mapnik.Map(256, 256)
m.append_style('poly', s)
m.layers.append(lyr)
m.zoom_all()
im = mapnik.Image(m.width, m.height)
detector = mapnik.LabelCollisionDetector(m)
mapnik.render_layer_with_detector(m, im, detector, lyr)
eq_(im.is_solid(), True)
c = im.get_pixel(0, 0, True)
eq_(c.r, 255)
eq_(c.g, 0)
eq_(c.b, 0)
eq_(c.a, 255)
def test_render_with_detector():
ds = mapnik.MemoryDatasource()
context = mapnik.Context()
geojson = '{ "type": "Feature", "geometry": { "type": "Point", "coordinates": [ 0, 0 ] } }'
ds.add_feature(mapnik.Feature.from_geojson(geojson, context))
s = mapnik.Style()
r = mapnik.Rule()
lyr = mapnik.Layer('point')
lyr.datasource = ds
lyr.styles.append('point')
symb = mapnik.MarkersSymbolizer()
symb.allow_overlap = False
r.symbols.append(symb)
s.rules.append(r)
m = mapnik.Map(256, 256)
m.append_style('point', s)
m.layers.append(lyr)
m.zoom_to_box(mapnik.Box2d(-180, -85, 180, 85))
im = mapnik.Image(256, 256)
mapnik.render(m, im)
expected_file = './images/support/marker-in-center.png'
actual_file = '/tmp/' + os.path.basename(expected_file)
#im.save(expected_file,'png8')
im.save(actual_file, 'png8')
actual = mapnik.Image.open(expected_file)
expected = mapnik.Image.open(expected_file)
eq_(
actual.tostring('png32'), expected.tostring('png32'),
'failed comparing actual (%s) and expected (%s)' %
(actual_file, expected_file))
# now render will a collision detector that should
# block out the placement of this point
detector = mapnik.LabelCollisionDetector(m)
eq_(detector.extent(), mapnik.Box2d(-0.0, -0.0, m.width, m.height))
eq_(detector.extent(), mapnik.Box2d(-0.0, -0.0, 256.0, 256.0))
eq_(detector.boxes(), [])
detector.insert(detector.extent())
eq_(detector.boxes(), [detector.extent()])
im2 = mapnik.Image(256, 256)
mapnik.render_with_detector(m, im2, detector)
expected_file_collision = './images/support/marker-in-center-not-placed.png'
#im2.save(expected_file_collision,'png8')
actual_file = '/tmp/' + os.path.basename(expected_file_collision)
im2.save(actual_file, 'png8')