safe.impact_functions.styles module¶

Library of styles that can be used by impact functions

E.g.:

from impact_functions.styles import flood_population_style as style_info
from impact_functions.core import get_function_title

# Create raster object with this style and return
R = Raster(
    I,
    projection=inundation.get_projection(),
    geotransform=inundation.get_geotransform(),
    name='Penduduk yang %s' % (get_function_title(self)),
    keywords={'impact_summary': impact_summary},
    style_info=style_info)

return R

safe.impact_functions.styles.categorical_style(target_field, categories, no_data_value, no_data_label, data_defined_saturation_field=None, max_impact_value=None)[source]¶

Style with equidistant hue and optional data defined saturation :param target_field: field name that needs to be classified :type: target_field, str

Parameters:	categories – values of target_field no_data_value – value for no data no_data_label – label for the no data category data_defined_saturation_field – field for saturation for the generated colors. max_impact_value – maximum value in data_defined_saturation_field, used to normalize saturation values for the generated colors.
Type:	categories, list
Type:	no_data_value, int, str
Type:	no_data_label, str
Type:	data_defined_saturation_field, None, str
Type:	max_impact_value, int, float
Returns:	a dict with target_field, style_classes and style_type
Return type:	dict

safe.impact_functions.styles.generate_categorical_color_ramp(class_count, reverse_hue=True, saturation=0.5, value=0.7)[source]¶

Makes a color ramp with equal HUE intervals. Sat and value are constant :param class_count: amount of hue steps (class count) :type: class_count, int

Parameters:	reverse_hue – if true makes red the END, else the START of the scale saturation – saturation for the generated colors. this stays constant value – value for the generated colors. this stays constant
Type:	reverse_hue, bool
Type:	saturation, float
Type:	value, float
Returns:	a dict of list containing the HSV, RGB and HEX representation of the color ramp. some thing like this: {‘hsv’: [(1.0, 0.5, 0.7), (0.8, 0.5, 0.7), (0.6, 0.5, 0.7), (0.3999999999999999, 0.5, 0.7), (0.19999999999999996, 0.5, 0.7)], ‘rgb’: [(178.5, 89.25, 89.25), (160.65000000000006, 89.25, 178.5), (89.25, 124.95000000000003, 178.5), (89.25, 178.5, 124.94999999999995), (160.65, 178.5, 89.25)], ‘hex’: [‘#b25959’, ‘#a059b2’, ‘#597cb2’, ‘#59b27c’, ‘#a0b259’]}
Return type:	dict

safe.impact_functions.styles.hsv_to_hex(hsv)[source]¶

Convert hue, saturation, value tuple to an hex sting. :param hsv: a (hue, saturation, value) tuple where hsv are 0-1 :type: hsv, tuple

Returns:	the hexadecimal color string.
Return type:	str

safe.impact_functions.styles.rgb_to_hex(rgb)[source]¶

Convert an rgb tuple in an hex sting. :param rgb: a (r, g, b) tuple where r, g, b are 0-255 :type: rgb, tuple

Returns:	the hexadecimal color string.
Return type:	str
See:	http://stackoverflow.com/q/214359/#answer-214657