New feature in Chart:

Now you can define a 'time-fixpoint' in the past
 and the Image will generatet everytime,when 
 ((now-fixpoint) % interval) ~ 0.
 so you can say: generate it every day at 12.00.


git-svn-id: file:///home/jan/tmp/wetterstation/trunk@203 dd492736-c11a-0410-ad51-8c26713eaf7f

cronjob/chart/definitions.h

@@ -36,6 +36,7 @@
 #define DEFAULT_GEN_INTERVAL	"15m"
 #define DEFAULT_SHOW_INTERVAL	"2d"
 #define DEFAULT_LABEL_INTERVAL	"2h"
+#define DEFAULT_FIX_TIMEPOINT	"no"
 #define DEFAULT_LABEL_SUM	"no"
 #define DEFAULT_ZERO_MIN	"no"
 #define DEFAULT_AS_BARS		"no"
@@ -86,6 +87,7 @@
 #define FALSE 0
 #define TRUE 1
 #define IMG_FONT "/usr/share/fonts/truetype/freefont/FreeSans.ttf"
+#define CRON_INTERVAL 15  //Minuten
 
 
 /* Debug --------------------------------------------------------------- */

cronjob/chart/image_conf/example.conf

@@ -29,6 +29,9 @@ gen_interval		1		# gibt an, in welchem Interval das Bild generiert werden soll
 show_interval		10d		# gibt an, welcher Interval angezeigt werden soll
 label_interval		1d		# gibt an, Welche zeitspanne (ab generierungszeitraum) angezeigt werden soll
 
+fixed_timepoint		yes
+timepoint		2006-12-17-13-00
+
 # Hoehe und Breite des Bildes
 width			800	
 height			300

cronjob/chart/image_conf/testimage.conf

@@ -5,9 +5,11 @@ manual_table		no
 manual_table_name	auss2_data
 table_field		temp
 #table_field		press	
-gen_interval		1
+gen_interval		10
 show_interval		10d	
 label_interval		1d
+fixed_timepoint		yes
+timepoint		2006-12-17-13-00
 width			800	
 height			300
 ensor_id		1

cronjob/chart/image_file/image_common.h

@@ -40,6 +40,8 @@ typedef struct image_cfg {
   long 	 gen_interval;		/* Generierungsinterval */
   long 	 show_interval;		/* Anzeigeinterval */
   long 	 label_interval;	/* Label - Interval */
+  long	 fix_timepoint;		/* Zu festem Zeitpunkt generieren */
+  long 	 timepoint;		/* Startzeitpunkt */
   int 	 label_sum;		/* Sollen Werte aufsummiert statt gemittelt werden */
   int 	 width;			/* Breite */
   int 	 height;		/* Hoehe */

cronjob/chart/image_file/image_config.c

@@ -23,6 +23,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
+#include <time.h>
 #include "../common.h"
 #include "../config.h"
 #include "image_common.h"
@@ -35,7 +36,7 @@ static int read_time(const char *, void *);
 static int read_color(const char *, void *);
 static int read_double(const char *, void *);
 static int read_fmt_str(const char *, void *);
-
+static int read_date(const char *, void *);
 
 
 /* Zuordnung zwischen Schluesselwoertern in der Config, Der Funktion, die diese auswertet 
@@ -51,6 +52,8 @@ static const config_keyword keywords[] = {
   {"gen_interval",    		read_time,          	&(img_cfg.gen_interval),        	DEFAULT_GEN_INTERVAL},
   {"show_interval",    		read_time,          	&(img_cfg.show_interval),       	DEFAULT_SHOW_INTERVAL},
   {"label_interval",   		read_time,          	&(img_cfg.label_interval),      	DEFAULT_LABEL_INTERVAL},
+  {"fixed_timepoint",  		read_yn,          	&(img_cfg.fix_timepoint),	       	DEFAULT_FIX_TIMEPOINT},
+  {"timepoint",   		read_date,          	&(img_cfg.timepoint),		       	""},
   {"label_sum",   		read_yn,          	&(img_cfg.label_sum),	        	DEFAULT_LABEL_SUM},
   {"width",			read_int,               &(img_cfg.width),    			DEFAULT_WIDTH},
   {"height",			read_int,               &(img_cfg.height),    			DEFAULT_HEIGHT},
@@ -131,6 +134,7 @@ static int read_color(const char *line, void *arg){
 
   if(strlen(line) == 11){						/* Wenn String auch wirkle 11 Zeichen lang */
     if (strchr(line, ':') != NULL){					/* und min. 1 : vorkommt */ 
+      strcpy(buff, "00\0");
       tmp        = malloc(sizeof(img_color_t));				/* Neues Farbelement allocieren */
       tmp->r     = strtol(strncpy(buff, line,   2), NULL, 16);		/* r */
       tmp->g     = strtol(strncpy(buff, line+3, 2), NULL, 16);		/* g */
@@ -191,6 +195,47 @@ static int read_time(const char *line, void *arg){
   return 1;
 }
 
+/* Liest das Datum, an dem die Bilder-generierung 
+ * 'festgemacht' werden soll.
+ * Format: yyyy-mm-dd-hh-mm */
+static int read_date(const char *line, void *arg){
+  struct tm timestruct;
+  long *dest = arg;
+  char *buff = malloc(sizeof(char)*5);
+  time_t temp = 0;
+
+  if(line == NULL){
+    *dest = 0;
+    free(buff);
+    return 1;
+  }
+
+  if(strlen(line) != 16){
+    DEBUGOUT2(" Invalid Date-String '%s'!\n", line);
+    *dest = 0;
+    free(buff);
+    return 1;
+  } else {
+    timestruct.tm_sec = 0;
+    timestruct.tm_isdst = -1;
+    strcpy(buff, "0000\0");
+    timestruct.tm_year = (atol(strncpy(buff, line,   4)) - 1901);
+    strcpy(buff, "00\0");
+    timestruct.tm_mon  = atol(strncpy(buff, line+5, 2));
+    timestruct.tm_mday = atol(strncpy(buff, line+8, 2));
+    timestruct.tm_hour = atol(strncpy(buff, line+11, 2));
+    timestruct.tm_min  = atol(strncpy(buff, line+14, 2));
+
+    temp = mktime(&timestruct);
+
+    DEBUGOUT2(" Datum gelesen: %s\n", ctime(&temp));
+  }
+ 
+  *dest = temp;
+
+  free(buff);
+  return 1;
+}
 
 /* Liest ein Bild-Configfile */
 int get_image_cfg(char *file){

cronjob/chart/image_file/image_file.c

@@ -24,6 +24,7 @@
 #include <unistd.h>
 #include <string.h>
 #include <time.h>
+#include <math.h>
 #include <sys/stat.h>
 #include "../definitions.h"
 #include "../common.h"
@@ -42,7 +43,8 @@ image_cfg_t img_cfg;
 /* Funktionsdefinitionen */
 static void regenerate_image();
 static int check_file_interval();
-
+static int check_time_with_stat();
+static int check_time_with_fixpoint();
 
 
 /* Handelt ein Bild */
@@ -94,10 +96,6 @@ void process_image_cfg(char *image_cfg_file){
  * neu zu erstellen */
 static int check_file_interval(){
 
-  struct stat stat_buff;
-  time_t now;
-  long diff_sek;
-
   /* Pruefen ob Bild vorhanden */
   if(access(img_cfg.file_name, F_OK) == -1){
     DEBUGOUT2("Datei '%s' existiert nicht\n", img_cfg.file_name);
@@ -105,6 +103,20 @@ static int check_file_interval(){
     return 1;
   }
 
+  if(img_cfg.fix_timepoint){
+    return check_time_with_fixpoint();
+  } else {
+    return check_time_with_stat();
+  }
+
+}
+
+static int check_time_with_stat(){
+
+  struct stat stat_buff;
+  time_t now;
+  long diff_sek;
+
   /* Pruefen ob Bild zu alt */
   if ((stat(img_cfg.file_name, &stat_buff)) != -1){
     
@@ -124,8 +136,34 @@ static int check_file_interval(){
   }
   DEBUGOUT1("Datei ist aktuell genug!\n");
   return 0;
+
 }
 
+static int check_time_with_fixpoint(){
+  
+  time_t now;
+  int max_diff  =  (CRON_INTERVAL -1) * 60;
+  int exact_val = 0;
+  int diff      = 0;
+
+  now = time(NULL);
+ 
+  exact_val = (floor( ((double)difftime(now, img_cfg.timepoint)) / ((double)img_cfg.gen_interval) ) * img_cfg.gen_interval) + img_cfg.timepoint;
+  diff = difftime(now, exact_val);
+
+  if(diff < max_diff){
+    DEBUGOUT3("Bild wird generiert, denn es ist kurz (%d sec) nach %s\n", diff, ctime(&exact_val));
+    
+    return 1;
+  } else {
+    DEBUGOUT1("Bild ist aktuell genug\n");
+    return 0;
+  }
+
+
+}
+
+
 /* Bild (neu-) generieren */
 static void regenerate_image(){
   FILE *fd = fopen(img_cfg.file_name, "wb");	/* Datei oeffnen */

debian/changelog

@@ -1,3 +1,9 @@
+weatherstation (1.0.5-1) stable; urgency=low
+
+  * New feature added in chart-program: building graphs on a 'fixpoint'
+
+ -- Jan Losinski <losinski@wh2.tu-dresden.de>  Thu,  2 Nov 2006 09:38:14 +0100
+
 weatherstation (1.0.4-2) stable; urgency=low
 
   * third try to fix negative tempatatures (seems to be correct!)