chaco.log_mapper module

Defines the LogMapper and InvalidDataRangeException classes.

exception chaco.log_mapper.InvalidDataRangeException

Bases: Exception

class chaco.log_mapper.LogMapper

Bases: chaco.base_1d_mapper.Base1DMapper

Defines a 1-D logarithmic scale mapping from a 1-D region in input space to a 1-D region in output space.

fill_value = Float(1.0)

The value to map when asked to map values <= LOG_MINIMUM to screen space.

map_data(screen_val) → data_val

Overrides Abstract Mapper. Maps values from screen space into data space.

map_data_array(screen_vals) → data_vals

Maps an array of values from screen space into data space. By default, this method just loops over the points, calling map_data() on each one. For vectorizable mapping functions, override this implmentation with a faster one.

map_screen(data_array) → screen_array

Overrides AbstractMapper. Maps values from data space to screen space.