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ancient-weatherstation
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Code Issues Releases Wiki Activity

Working on charts 

(vertical scaling of values)

git-svn-id: file:///home/jan/tmp/wetterstation/trunk@87 dd492736-c11a-0410-ad51-8c26713eaf7f
This commit is contained in:
losinshi 2006-09-13 15:13:06 +00:00
parent 6208082794
commit dc863f8bd6
3 changed files with 47 additions and 5 deletions
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32
cronjob/chart/image_file/image_data.c
View File

@ -24,11 +24,32 @@ static PGresult *pg_check_exec(PGconn *, char *);
static char *get_type_table_by_id(PGconn *, int );
/* Skaliert die X-Koordinaten der Punkte im angegebenem Bereich
* ausführliche Beschreibung im header-file */
int scale_y_coords(pix_list_ptr ptr, int c_height, int max_label, int min_label){
int range = (max_label - min_label + 1) * 10; /* Anzahl von 0,1-Schritten */
double pix_per_scale = ((double)c_height) / ((double)range); /* Pixel pro 0,1 */
pix_list_ptr temp = ptr;
int zero_line = floor( ((double)max_label) * pix_per_scale); /* Nullinie */
DEBUGOUT1("\nBerechne y-Koordinaten:\n");
for (; temp; temp = temp->next){
temp->y_pix_coord = floor( ( ((double)temp->value_sum) / ((double)temp->value_count) ) * pix_per_scale);
DEBUGOUT3(" neue y-Koordinate: %d bei x: %d\n",temp->y_pix_coord, temp->x_pix_coord);
}
DEBUGOUT2(" Nullinie bei: %d\n", zero_line);
return zero_line;
}
/* Maximaler wert */
pix_list_ptr get_max(){
return min;
}
/* Minimaler Wert */
pix_list_ptr get_min(){
return max;
}
@ -73,8 +94,15 @@ pix_list_ptr get_pix_list(int c_width){
pix_coord = floor( ((double)time_temp) * seconds_per_pix) ;
temp_ptr = add_pix_value(temp_ptr, pix_coord, atoi( PQgetvalue(res, i, val_field) ) );
if (list_ptr == NULL)
if (list_ptr == NULL){
list_ptr = temp_ptr;
/* Globale Variablen neu initialisieren um
* mehtete Bilder in einem Thread bauen zu
* können */
min = temp_ptr;
max = temp_ptr;
}
/* Min / Max ermitteln */
if (min != NULL){
@ -112,6 +140,7 @@ static pix_list_ptr add_pix_value(pix_list_ptr ptr, int coord, int value){
ptr = malloc(sizeof(pix_list_t));
ptr->next = NULL;
ptr->x_pix_coord = 0;
ptr->y_pix_coord = 0;
ptr->value_count = 0;
ptr->value_sum = 0;
DEBUGOUT1(" Erstes Element generiert...\n");
@ -126,6 +155,7 @@ static pix_list_ptr add_pix_value(pix_list_ptr ptr, int coord, int value){
ptr->next = malloc(sizeof(pix_list_t));
ptr = ptr->next;
ptr->x_pix_coord = coord;
ptr->y_pix_coord = coord;
ptr->value_sum = value;
ptr->value_count = 1;
ptr->next = NULL;

10
cronjob/chart/image_file/image_data.h
View File

@ -5,6 +5,7 @@ typedef struct pix_list *pix_list_ptr;
typedef struct pix_list {
pix_list_ptr next;
int x_pix_coord;
int y_pix_coord;
int value_count;
int value_sum;
} pix_list_t;
@ -19,3 +20,12 @@ pix_list_ptr get_pix_list(int );
pix_list_ptr get_min();
pix_list_ptr get_max();
/* Skaliert die X-Koordinaten der Punkte im angegebenem Bereich
* 1. Argument: die Pix-Liste die skaliert werden soll
* 2. Argument: die anzahl der Pixel in y-Richtung
* 3. Argument: max. Wert
* 4. Argument: min. Wert
* Rueckgabe: Position der 0-Linie von oben aus
*/
int scale_y_coords(pix_list_ptr , int , int , int );

10
cronjob/chart/image_file/image_draw.c
View File

@ -9,13 +9,13 @@ typedef int color;
static gdImagePtr create_image();
static void draw_image();
static gdImagePtr draw_image(gdImagePtr);
static void write_image_png(gdImagePtr, FILE *);
int draw_to_file(FILE *fd){
gdImagePtr img = create_image();
draw_image();
draw_image(img);
write_image_png(img, fd);
}
@ -33,9 +33,9 @@ static gdImagePtr create_image(){
return new_img;
}
static void draw_image(){
static gdImagePtr draw_image(gdImagePtr img){
pix_list_ptr pix_list = get_pix_list(300);
scale_y_coords(pix_list, 100, 40, -10);
}
static void write_image_png(gdImagePtr img, FILE *fd){
@ -43,3 +43,5 @@ static void write_image_png(gdImagePtr img, FILE *fd){
gdImageSaveAlpha(img, 1);
gdImagePng(img, fd);
}