subsurface/core/divelist.h

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// SPDX-License-Identifier: GPL-2.0
#ifndef DIVELIST_H
#define DIVELIST_H
#include "dive.h"
#ifdef __cplusplus
extern "C" {
#endif
/* this is used for both git and xml format */
#define DATAFORMAT_VERSION 3
extern void update_cylinder_related_info(struct dive *);
extern void mark_divelist_changed(bool);
extern int unsaved_changes(void);
extern int init_decompression(struct deco_state *ds, struct dive *dive);
/* divelist core logic functions */
extern void process_loaded_dives();
/* flags for process_imported_dives() */
#define IMPORT_PREFER_IMPORTED (1 << 0)
#define IMPORT_IS_DOWNLOADED (1 << 1)
#define IMPORT_MERGE_ALL_TRIPS (1 << 2)
#define IMPORT_ADD_TO_NEW_TRIP (1 << 3)
extern void add_imported_dives(struct dive_table *import_table, struct trip_table *import_trip_table, struct dive_site_table *import_sites_table,
int flags);
extern void process_imported_dives(struct dive_table *import_table, struct trip_table *import_trip_table, struct dive_site_table *import_sites_table,
int flags,
struct dive_table *dives_to_add, struct dive_table *dives_to_remove,
struct trip_table *trips_to_add, struct dive_site_table *sites_to_add);
extern char *get_dive_gas_string(const struct dive *dive);
extern struct dive **grow_dive_table(struct dive_table *table);
extern int dive_table_get_insertion_index(struct dive_table *table, struct dive *dive);
extern void add_to_dive_table(struct dive_table *table, int idx, struct dive *dive);
extern void append_dive(struct dive *dive);
extern void insert_dive(struct dive_table *table, struct dive *d);
extern void get_dive_gas(const struct dive *dive, int *o2_p, int *he_p, int *o2low_p);
extern int get_divenr(const struct dive *dive);
extern int remove_dive(const struct dive *dive, struct dive_table *table);
extern bool consecutive_selected();
extern void select_dive(struct dive *dive);
extern void deselect_dive(struct dive *dive);
extern void filter_dive(struct dive *d, bool shown);
extern struct dive *first_selected_dive();
extern struct dive *last_selected_dive();
extern int get_dive_nr_at_idx(int idx);
extern void set_dive_nr_for_current_dive();
extern timestamp_t get_surface_interval(timestamp_t when);
extern void delete_dive_from_table(struct dive_table *table, int idx);
extern struct dive *find_next_visible_dive(timestamp_t when);
extern int comp_dives(const struct dive *a, const struct dive *b);
int get_min_datafile_version();
void reset_min_datafile_version();
void report_datafile_version(int version);
int get_dive_id_closest_to(timestamp_t when);
void clear_dive_file_data();
void clear_table(struct dive_table *table);
More accurate CNS calculations (following comments on github) Update table of maximum oxygen exposure durations, used in CNS calulations. This table shows the official NOAA maximum O2 exposure limits (in seconds) for different PO2 values. It also gives slope values for linear interpolation for intermediate PO2 values between the tabulated PO2 values in the 1st column. Top & bottom rows are inserted that are not in the NOAA table: (1) For PO2 > 1.6 the same slope value as between 1.5 & 1.6 is used. This exptrapolation for PO2 > 1.6 likely gives an underestimate above 1.6 but is better than the value for PO2=1.6 (45 min). (2) The NOAA table only tabulates values for PO2 >= 0.6. Since O2-uptake occurs down to PO2=0.5, the same slope is used as for 0.7 > PO2 > 0.6. This gives a conservative estimate for 0.6 > PO2 > 0.5. To preserve the integer structure of the table, all slopes are given as slope*10: divide by 10 to get the valid slope. The columns below are: po2 (mbar), Maximum Single Exposure (seconds), single_slope, Maximum 24 hour Exposure (seconds), 24h_slope */ Then update Calculations of the CNS for a single dive - this only takes the first divecomputer into account. The previous version of the code did a table lookup and used the max O2 exposure for the next-higher PO2 category. This gave a shorter max O2 exposure time and a higher CNS contribution for a specific dive segment, resulting in a slightly conservative value of CNS, often some 2 - 3 % too high. This code does an interpolation for PO2 values inbetween PO2 entries in the lookup table and therefore results in a more accurate maximum O2 exposure time for that PO2. The maximum O2 exposure duration for each segment is also calculated based on the mean depth of the two samples (start & end) that define each segment. The CNS contribution of each segment is found by dividing the time duration of the segment by its maximum exposure duration. The contributions of all segments of the dive are summed to get the total CNS% value. This is a partial implementation of the proposals in Erik Baker's document "Oxygen Toxicity Calculations" */ Overall, this PR does not radically alter the existing CNS calculation, it only makes it more accurate and more consistent by doing interpolation and by using mean segment depth to find PO2. Signed-off-by: willemferguson <willemferguson@zoology.up.ac.za>
2018-11-10 13:49:52 +02:00
typedef enum {PO2VAL, SINGLE_EXP, SINGLE_SLOPE, DAILY_EXP, DAILY_SLOPE, NO_COLUMNS} cns_table_headers;
#ifdef DEBUG_TRIP
extern void dump_selection(void);
#endif
#ifdef __cplusplus
}
#endif
#endif // DIVELIST_H