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ancient-weatherstation/cronjob/chart/image_file/image_data.c

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/*
image_data.c -- Part of Chart-generator for the weatherstation
Copyright (C) 2006 Jan Losinski
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <string.h>
#include <math.h>
#include <postgresql/libpq-fe.h>
#include "image_data.h"
#include "image_common.h"
#include "../common.h"
#include "../definitions.h"
#define BUFFSIZE 512
/* Variablen */
static pix_list_ptr min = NULL; /* Pointer auf min - Element */
static pix_list_ptr max = NULL; /* Pointer auf Max - Element */
double real_min = 0; /* Realer Max - Wert */
double real_max = 0; /* Realer Min - Wert */
static long base_time; /* Zeit an der 0-Koordinate (lt. Datenbank!) */
/* Funktionsdefinitionen */
static pix_list_ptr add_pix_value(pix_list_ptr , long, int , int );
static char *get_conn_string();
static PGconn *pg_check_connect(char *);
static PGresult *pg_check_exec(PGconn *, char *);
static char *get_type_table_by_id(PGconn *, int );
/* Bibt die Liste mit den y-Labels zurueck */
label_list_ptr get_y_label_list(int c_hight, int padding){
int max_val = 0; /* Maximaler Wert */
int min_val = 0; /* Minimaler Wert */
double factor = 0; /* Pixel / Werte */
int diff = 0; /* Wertebereich */
double real_diff = 0; /* Realer Wertebereich */
double padd_val = 0;
int temp = 0;
double koeff = 1;
double interval = 0;
int num = 0;
int max_num = 0;
int i;
int new_val = 0;
char * buff = NULL;
label_list_ptr ptr = NULL;
label_list_ptr new_ptr = NULL;
label_list_ptr temp_ptr = NULL;
DEBUGOUT1("\nBaue y-Labels...\n");
DEBUGOUT4(" Max. Wert: %d, Min. Wert: %d (inkl. Koeffizient: %3.3f)\n", max_val, min_val, img_cfg.val_koeff);
/* Max und min festlegen */
if (!img_cfg.label_sum){
max_val = ceil( ( ((double)max->value_sum) / ((double)max->value_count) ) * img_cfg.val_koeff);
min_val = floor( ( ((double)min->value_sum) / ((double)min->value_count) ) * img_cfg.val_koeff);
} else {
max_val = ceil( ( ((double)max->value_sum) ) * img_cfg.val_koeff);
min_val = floor( ( ((double)min->value_sum) ) * img_cfg.val_koeff);
}
/* Min 0 setzen wenn zero_min gesetzt */
if (img_cfg.zero_min){
min_val = 0;
}
/* Rechnen ... */
diff = max_val - min_val;
factor = ( ((double)c_hight - (2 * padding)) / ((double)diff) );
padd_val = (1 / factor) * ((double)padding);
real_min = min_val - padd_val;
real_max = max_val + padd_val;
real_diff = real_max - real_min;
DEBUGOUT5(" Realer Max. Wert: %3.3f, Realer Min. Wert: %3.3f Differenz: %3.3f (inkl. Koeffizient: %3.3f)\n", real_max, real_min, real_diff, img_cfg.val_koeff);
/* Interval der Labels berechnen */
temp = floor( real_diff );
interval = 1;
max_num = floor(c_hight / 20);
while ((num = floor( temp / interval )) > max_num){
interval++;
}
DEBUGOUT2(" Interval: %f \n", interval);
/* An Labels auf die 0 'eichen' */
temp = ceil(real_min);
while (fmod(((double)temp), ((double)interval)) != 0){
temp++;
}
/* Bugfix: manchmal wird das obeste Label nicht angezeigt,
* daher den Zaehler um eins erh<72>hen und wenn dabei ueber
* den Bereich hinaus, dann wieder eins runter */
num++;
if (((temp + (num - 1)) * interval) > (real_max - 1))
num--;
/* Puffer fuer die Labels */
buff = malloc(sizeof(char)*BUFFSIZE);
/* Labels generieren */
for (i = 0; i < num; i++){
/* Momentaner wert */
new_val = temp + (i * interval);
/* Labels zusammenbauen */
if(img_cfg.unit != NULL){
snprintf(buff, BUFFSIZE, "%d%s", new_val, img_cfg.unit);
} else {
snprintf(buff, BUFFSIZE, "%d", new_val);
}
/* Neues Label - Element */
new_ptr = malloc(sizeof(label_list_t));
new_ptr->pos = floor( (real_max - ((double)new_val) ) * factor);
new_ptr->value = new_val;
new_ptr->text = strdup(buff);
new_ptr->next = NULL;
/* Rueckgabe- und Temp-pointer zuweisen */
if (ptr != NULL){
temp_ptr->next = new_ptr;
temp_ptr = temp_ptr->next;
} else {
ptr = new_ptr;
temp_ptr = new_ptr;
}
DEBUGOUT3(" Label '%s' an Position %d\n", new_ptr->text, new_ptr->pos);
}
free(buff);
DEBUGOUT2(" %d Labels generiert\n", num);
return ptr;
}
/* Baut die Liste mit den Labels an der X-Achse */
label_list_ptr get_x_label_list(int c_width){
double factor = ((double)img_cfg.label_interval) * ( ((double)c_width) / ((double)img_cfg.show_interval) );
int num = floor( ((double)img_cfg.show_interval) / ((double)img_cfg.label_interval) );
char *buff = malloc(sizeof(char)*BUFFSIZE);
int i;
time_t timestamp;
label_list_ptr ptr = NULL;
label_list_ptr new_ptr = NULL;
label_list_ptr temp_ptr = NULL;
DEBUGOUT1("\nBaue x-Labels...\n");
/* Labels generieren */
for ( i = 1; i < num; i++ ) {
/* aktueller Timestamp */
timestamp = base_time + (i * img_cfg.label_interval);
/* Text fuer das Label bauen */
strftime(buff, BUFFSIZE, img_cfg.x_fmt, localtime(&timestamp) );
/* Neues Label - Element */
new_ptr = malloc(sizeof(label_list_t));
new_ptr->pos = floor( ((double)i) * factor);
new_ptr->value = base_time + (i * img_cfg.label_interval);
new_ptr->text = strdup(buff);
new_ptr->next = NULL;
/* Rueckgabe- und Temp-pointer zuweisen */
if (ptr != NULL){
temp_ptr->next = new_ptr;
temp_ptr = temp_ptr->next;
} else {
ptr = new_ptr;
temp_ptr = new_ptr;
}
DEBUGOUT3(" Label '%s' an Position %d\n", new_ptr->text, new_ptr->pos);
}
DEBUGOUT2(" %d Labels generiert\n", num);
free(buff);
return ptr;
}
/* Skaliert die X-Koordinaten der Punkte im angegebenem Bereich
* ausfuehrliche Beschreibung im header-file */
int scale_y_coords(pix_list_ptr ptr, int c_height){
double range = (((real_max - real_min) / img_cfg.val_koeff ) + 1) ; /* Anzahl von 0,1-Schritten */
double pix_per_scale = ((double)c_height) / ((double)range); /* Pixel pro 0,1 */
int zero_line = floor( ((double)((real_max / img_cfg.val_koeff) + 1)) * pix_per_scale); /* Nullinie */
pix_list_ptr temp = ptr; /* Temporaerer Pointer zum durchgehen der Liste */
DEBUGOUT1("\nBerechne y-Koordinaten:\n");
/* Liste duchgehen */
for (; temp; temp = temp->next){
/* unterscheidung ob summiert oder gemittelt werden soll */
if(!img_cfg.label_sum){
temp->y_pix_coord = (-1 * floor( ( ((double)temp->value_sum) / ((double)temp->value_count) ) * pix_per_scale)) + zero_line;
} else {
temp->y_pix_coord = (-1 * floor( ((double)temp->value_sum) * pix_per_scale)) + zero_line;
}
DEBUGOUT3(" neue y-Koordinate: %d bei x: %d\n",temp->y_pix_coord, temp->x_pix_coord);
}
DEBUGOUT2(" Nullinie bei: %d\n", zero_line);
/* Wenn Nullinie zu sehen, dann die Position zurueckgeben */
if ((real_max - real_min + 1) >= real_max){
return zero_line;
} else {
return -1;
}
}
/* Maximaler wert */
pix_list_ptr get_max_val(){
return min;
}
/* Minimaler Wert */
pix_list_ptr get_min_val(){
return max;
}
/* Maximale Zeit */
char *get_max_time(){
char *buff = malloc(sizeof(char)*BUFFSIZE);
time_t timestamp = base_time + img_cfg.show_interval;
strftime(buff, BUFFSIZE, img_cfg.x_fmt_extra, localtime(&timestamp) );
return buff;
}
/* Minimale Zeit */
char *get_min_time(){
char *buff = malloc(sizeof(char)*BUFFSIZE);
time_t timestamp = base_time ;
strftime(buff, BUFFSIZE, img_cfg.x_fmt_extra, localtime(&timestamp) );
return buff;
}
/* Holt eine Liste mit den Werten und den jeweiligen x-koordinaten */
pix_list_ptr get_pix_list(int c_width){
double seconds_per_pix = ((double)c_width)/((double)img_cfg.show_interval); /* Pixel pro Sekunde */
char *conn_string = get_conn_string(); /* Verbindungs-String */
PGconn *conn = pg_check_connect(conn_string); /* Datenbank - Verbindung */
char *table = NULL; /* Tabellen - Name */
char *query = malloc(sizeof(char)*BUFFSIZE); /* Query */
PGresult *res = NULL; /* Darenbank - Result */
int time_field; /* Id ses Timestamp-Feldes */
int val_field; /* Id des Wert - Feldes */
long time_temp; /* Hilfsvariable */
int pix_coord; /* x - Koordinate, an die der Wert gehoert */
int i, s, t, u; /* Laufvariable zum durchlaufen des Datenbank-resuls */
long timestamp;
pix_list_ptr list_ptr = NULL; /* Zeiger auf den Anfang der Wertliste */
pix_list_ptr temp_ptr = NULL; /* Zeiger zum durchlaufen der Wertliste */
DEBUGOUT1("\nHole Daten...\n");
DEBUGOUT2(" Ein Pixel entspricht %f sekunden\n", seconds_per_pix);
/* Tabellenname holen */
if (img_cfg.manual_table) {
table = strdup(img_cfg.table_name);
} else {
table = get_type_table_by_id(conn, img_cfg.sens_id);
}
/* Anfrage zusammenbauen */
snprintf(query, BUFFSIZE, "SELECT round(date_part('epoch', current_timestamp)) AS now, round(date_part('epoch', timestamp)) AS times, %s AS val FROM %s WHERE sens_id=%d AND timestamp > (current_timestamp - INTERVAL '%d seconds') ORDER BY times ASC", img_cfg.table_field, table, img_cfg.sens_id, img_cfg.show_interval );
/* Anfrage stellen */
res = pg_check_exec(conn, query);
/* ID's der Felder ermitteln */
time_field = PQfnumber(res, "times");
val_field = PQfnumber(res, "val");
/* Momentane Zeit */
if(PQntuples(res) > 0){
base_time = atol(PQgetvalue(res, 0, PQfnumber(res, "now"))) - img_cfg.show_interval;
} else {
base_time = time(NULL);
}
/* Ergebnisse durchlaufen */
for (i = 0; i < PQntuples(res); i++){
timestamp = atol(PQgetvalue(res, i, time_field));
time_temp = timestamp - base_time;
/* Wenn Balken gezeichnet werden sollen */
if(img_cfg.bars){
time_temp --;
if(time_temp < 1)
time_temp++;
time_temp = floor( ((double)time_temp) / ((double)img_cfg.label_interval) ) * img_cfg.label_interval;
}
/* Koordinate berechnen */
pix_coord = floor( ((double)time_temp) * seconds_per_pix) ;
/* Listenelement generieren */
temp_ptr = add_pix_value(temp_ptr, timestamp, pix_coord, atoi( PQgetvalue(res, i, val_field) ) );
/* Rueckgabe- und Max/Min-pointer zuweisen */
if (list_ptr == NULL){
list_ptr = temp_ptr;
/* Globale Variablen neu initialisieren um
* mehtete Bilder in einem Thread bauen zu
* koennen */
min = temp_ptr;
max = temp_ptr;
}
}
/* Wenn keine Daten vorhanden, dann Fake - Element generieren */
if(i == 0){
timestamp = timestamp - base_time +1;
if(img_cfg.bars){
time_temp = floor( ((double)timestamp) / ((double)img_cfg.label_interval) ) * img_cfg.label_interval;
} else {
time_temp = timestamp;
}
pix_coord = floor( ((double)time_temp) * seconds_per_pix) ;
temp_ptr = add_pix_value(temp_ptr, timestamp, pix_coord, 0 );
list_ptr = temp_ptr;
min = temp_ptr;
max = temp_ptr;
}
/* Min / Max ermitteln */
temp_ptr = list_ptr;
u = 1;
s = 1;
t = 1;
for (; temp_ptr; temp_ptr = temp_ptr->next){
if(!img_cfg.label_sum){
t = temp_ptr->value_count;
s = min->value_count;
u = max->value_count;
}
if (min != NULL){
if ( (temp_ptr->value_sum / t) < (min->value_sum / s) )
min = temp_ptr;
} else {
min = temp_ptr;
}
if (max != NULL){
if ( (temp_ptr->value_sum / t) > (max->value_sum / u) )
max = temp_ptr;
} else {
max = temp_ptr;
}
}
DEBUGOUT2(" %d Werte geholt \n", i);
DEBUGOUT3(" Min: x-pos.: %d, Wert: %d\n", min->x_pix_coord, (min->value_sum / min->value_count) );
DEBUGOUT3(" Max: x-pos.: %d, Wert: %d\n", max->x_pix_coord, (max->value_sum / max->value_count) );
/* Aufraemen */
PQclear(res);
PQfinish(conn);
free(query);
free(table);
free(conn_string);
return list_ptr;
}
/* Speichert einen geholten Wert ab */
static pix_list_ptr add_pix_value(pix_list_ptr ptr, long timestamp, int coord, int value){
/* Erstes Element */
if(ptr == NULL){
DEBUGOUT1("\nLese Daten ein:\n");
ptr = malloc(sizeof(pix_list_t));
ptr->next = NULL;
ptr->x_pix_coord = coord;
ptr->y_pix_coord = 0;
ptr->value_count = 1;
ptr->value_sum = value;
DEBUGOUT3(" Erstes Element generiert...x-pos.: %d Wert: %d\n",ptr->x_pix_coord, ptr->value_sum);
} else {
/* Wenn schon ein Wert fuer X - Koordinate vorhanden,
* dann aufsummieren, sonst neues Element anfuegen */
if(coord == ptr->x_pix_coord){
ptr->value_sum += value;
ptr->value_count++;
DEBUGOUT5(" Zu x-pos. %d %d. Wert (%d) hinzugefuegt. Durchschn.: %d\n", ptr->x_pix_coord, ptr->value_count, value, (ptr->value_sum/ptr->value_count) );
} else {
ptr->next = malloc(sizeof(pix_list_t));
ptr = ptr->next;
ptr->x_pix_coord = coord;
ptr->y_pix_coord = 0;
ptr->value_sum = value;
ptr->value_count = 1;
ptr->next = NULL;
DEBUGOUT3(" An x-pos. %d Wert %d eingefuegt\n", ptr->x_pix_coord, ptr->value_sum);
}
}
return ptr;
}
/* baut den String fuer die Postgres-Verbindung zusammen */
static char *get_conn_string(){
char *conn_string = malloc(sizeof(char)*BUFFSIZE);
snprintf(conn_string, BUFFSIZE, "host=%s dbname=%s user=%s password=%s connect_timeout=%s", global_opts.pg_host, global_opts.pg_database, global_opts.pg_user, global_opts.pg_pass, global_opts.pg_timeout);
return conn_string;
}
/* Baut eine Vebindung zur postgres auf, bricht mit fehler ab wenn nicht moeglich */
static PGconn *pg_check_connect(char *conn_string){
PGconn *conn = PQconnectdb(conn_string); /* Connection aufbauen */
if(PQstatus(conn) != CONNECTION_OK){
DEBUGOUT2("\nFehler beim Aufbau der Datenbankverbindung\n%s\n", PQerrorMessage(conn));
exit_error(ERROR_MAKECONN);
}
DEBUGOUT1("Verbindung hergestellt \n");
return conn;
}
/* Fuehrt ein SQL-Statement aus. Bricht mit fehler ab wenn nicht moeglich */
static PGresult *pg_check_exec(PGconn *conn, char *query){
PGresult *res;
res = PQexec(conn, query);
if(!res || PQresultStatus(res) != PGRES_TUPLES_OK){
DEBUGOUT2("Fehler beim exec: %s\n", query);
exit_error(ERROR_QUERY);
} else {
DEBUGOUT2("Query: '%s' ausgefuehrt\n", query);
}
return res;
}
/* Tabellenname des typs aus der Datenbank holen */
static char *get_type_table_by_id(PGconn *connection, int sens_id){
char *table;
int table_field;
PGresult *table_res;
char *query_buff = malloc(sizeof(char)*BUFFSIZE);
snprintf(query_buff, BUFFSIZE, "select typen.tabelle as tbl FROM typen, sensoren WHERE sensoren.id=%d AND typen.typ=sensoren.typ", sens_id);
table_res = pg_check_exec(connection, query_buff);
if(PQntuples(table_res) < 1)
return NULL;
table_field = PQfnumber(table_res, "tbl");
table = strdup(PQgetvalue(table_res, 0, table_field));
DEBUGOUT2("\tTabelle: %s \n", table);
PQclear(table_res);
free(query_buff);
return table;
}
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