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QGIS Geometry Generators - CartoHack #9
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collect_geometries( | |
array_foreach( | |
generate_series(1, to_int("count"), 1), | |
translate( | |
geom_from_wkt( | |
concat( | |
'LINESTRING(0 50,', | |
to_string(rand(-25, 25, concat("fid", '_x', @element))), | |
' ', | |
to_string(rand(-5, 5, concat("fid", '_y', @element))), | |
')' | |
) | |
), | |
x($geometry), | |
y($geometry) | |
) | |
) | |
) |
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collect_geometries( | |
array_foreach( | |
generate_series(1, to_int("count"), 1), | |
translate( | |
translate( | |
rotate( | |
geom_from_wkt( | |
'CURVEPOLYGON( | |
COMPOUNDCURVE( | |
CIRCULARSTRING( | |
0 0, 15 -5, 30 0, | |
15 5, 0 0 | |
) | |
) | |
)' | |
), rand(-200, 20, concat("fid", '_r', @element)), make_point(0, 0) | |
), x($geometry), y($geometry) | |
), rand(-25, 25, concat("fid", '_x', @element) ), rand(-5, 5, concat("fid", '_y', @element) ) | |
) | |
) | |
) |
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from qgis.core import * | |
from qgis.gui import * | |
import math | |
@qgsfunction(args='auto', group='Custom') | |
def polar_point(radius, angle, feature, parent): | |
""" | |
Calculates the polar coordinate from radius and angle (in radians) | |
<h2>Example usage:</h2> | |
<ul> | |
<li>polar_point(5, pi) -> 5</li> | |
</ul> | |
""" | |
x = radius * math.cos(angle) | |
y = radius * math.sin(angle) | |
# point = QgsPoint(x, y) | |
return str(x) + ' ' + str(y) |
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with_variable( | |
'radius', | |
20, | |
collect_geometries( | |
array_foreach( | |
generate_series(1, "count" * 5, 1), | |
translate( | |
geom_from_wkt( | |
concat( | |
'LINESTRING(0 0,', | |
polar_point( | |
@radius + randf(0, 15), | |
pi() * 2 / ("count" * 5) * @element | |
), | |
')' | |
) | |
), | |
x($geometry), | |
y($geometry) | |
) | |
) | |
) | |
) |
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with_variable( | |
'config', | |
map( | |
'steps_x', 50, | |
'steps_y', 50, | |
'elevation', 0.0002, | |
'raster_layer', 'srtm_germany_dtm' | |
), | |
collect_geometries( | |
array_foreach( | |
generate_series( | |
y_min($geometry), | |
y_max($geometry), | |
(y_max($geometry) - y_min($geometry)) / @config['steps_y'] | |
), | |
with_variable( | |
'cY', | |
@element, | |
geom_from_wkt( | |
concat( | |
'LINESTRING(', | |
array_to_string( | |
array_foreach( | |
generate_series( | |
x_min($geometry), | |
x_max($geometry), | |
(x_max($geometry) - x_min($geometry)) / @config['steps_x'] | |
), | |
concat( | |
to_string(@element), | |
' ', | |
to_string( | |
@cY + | |
coalesce( | |
raster_value( | |
@config['raster_layer'], | |
1, | |
make_point( | |
@element, | |
@cY | |
) | |
), | |
0 | |
) * @config['elevation'] | |
) | |
) | |
), | |
',' | |
), | |
')' | |
) | |
) | |
) | |
) | |
) | |
) |
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