# HG changeset patch
# User meillo@marmaro.de
# Date 1211837136 -7200
# Node ID 9bd0a2100694048eea4d849a159c5ba82b509dba
# Parent  b1e309dc0b981df7f56fface53565bdafe8e2827
new weather implementation

diff -r b1e309dc0b98 -r 9bd0a2100694 weather.c
--- a/weather.c	Thu May 15 21:42:01 2008 +0200
+++ b/weather.c	Mon May 26 23:25:36 2008 +0200
@@ -1,46 +1,87 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <mysql.h>
+#include <time.h>
 
 #include "db.h"
 #include "game.h"
 
 
+enum {
+	Nlast = 2,
+};
 
+enum { Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec };
 
-void set_weather() {
-	int temperature, sun, rain, wind, humidity;
+struct weather {
+	float temp;
+	float sun;
+	float rain;
+	float wind;
+	float hum;
+};
 
-	/* get last weather and calculate the next one *
-	sprintf(query, "select time from simulation where name = '%s' ", gamename);
+float mean_temp[12] = {1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, 11.0, 12.0};
+float mean_sun[12] = {1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, 11.0, 12.0};
+float mean_rain[12] = {1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, 11.0, 12.0};
+float mean_wind[12] = {1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, 11.0, 12.0};
+float mean_hum[12] = {1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0, 11.0, 12.0};
+
+
+float rand_limit(float limit) {
+	/* generates random number between -limit and +limit */
+	int r;
+
+	r = rand() / ( ((float) RAND_MAX + 1) / (2*limit) );
+	return r - limit;
+}
+
+
+
+
+void getlastweather(struct weather lastw[], int nlast) {
+	char query[512];
+	int i;
+
+	sprintf(query,
+			" select temp, sun, rain, wind, hum from weather "
+			" where game_id = '%d' "
+			" order by tick desc "
+			" limit %d "
+			, gameid, nlast);
 	db_query(query);
 	result = mysql_store_result(conn);
-	if (mysql_num_rows(result)) {
-		row = mysql_fetch_row(result);
-		time = atoi(row[0]);
+	for (i = 0; i < nlast && (row = mysql_fetch_row(result)); i++) {
+		lastw[i].temp = atof(row[0]);
+		lastw[i].sun = atof(row[1]);
+		lastw[i].rain = atof(row[2]);
+		lastw[i].wind = atof(row[3]);
+		lastw[i].hum = atof(row[4]);
 	}
 	mysql_free_result(result);
-	*/
 
-	temperature = 20;
-	sun = 5;
-	rain = 1;
-	wind = 10;
-	humidity = 40;
+}
 
 
-	/* set weather */
-	sprintf(query, " insert into weather \
-			(tick, game_id, temperature, sun, rain, wind, humidity) \
-			values ('%d', '%d', '%d', '%d', '%d', '%d', '%d') ",
-			gametime, gameid, temperature, sun, rain, wind, humidity);
+void genweather(struct weather* w, struct weather lastw[], int nlast, int month) {
+	w->temp = 0.2 * mean_temp[month] + 0.4 * lastw[0].temp + 0.2 * lastw[1].temp + 0.08 * rand_limit(10); // + 0.02 * rand_limit(100);
+	w->sun = 0.2 * mean_sun[month] + 0.4 * lastw[0].sun + 0.2 * lastw[1].sun + 0.08 * rand_limit(10); // + 0.02 * rand_limit(100);
+	w->rain = 0.2 * mean_rain[month] + 0.4 * lastw[0].rain + 0.2 * lastw[1].rain + 0.08 * rand_limit(10); // + 0.02 * rand_limit(100);
+	w->wind = 0.2 * mean_wind[month] + 0.4 * lastw[0].wind + 0.2 * lastw[1].wind + 0.08 * rand_limit(10); // + 0.02 * rand_limit(100);
+	w->hum = 0.2 * mean_hum[month] + 0.4 * lastw[0].hum + 0.2 * lastw[1].hum + 0.08 * rand_limit(10); // + 0.02 * rand_limit(100);
+}
+
+
+int setweather(struct weather* w) {
+	char query[512];
+	sprintf(query,
+			" insert into weather "
+			" (tick, game_id, temp, sun, rain, wind, hum) "
+			" values ('%d', '%d', '%f', '%f', '%f', '%f', '%f') "
+			, gametime, gameid, w->temp, w->sun, w->rain, w->wind, w->hum);
 	db_query(query);
-	if (mysql_affected_rows(conn) > 0) {
-		printf("weather successful inserted\n");
-	} else {
-		printf("E: weather insertion failed\n");
-	}
-
+	puts(query);
+	return mysql_affected_rows(conn);
 }
 
 
@@ -57,7 +98,23 @@
 	db_connect();
 	check_game();
 
-	set_weather();
+	srand((unsigned int) time(NULL));
+
+
+	struct weather w;
+	struct weather lastn[Nlast];
+
+	getlastweather(lastn, Nlast);
+
+	genweather(&w, lastn, Nlast, May);
+
+	if (setweather(&w) > 0) {
+		printf("weather successful inserted\n");
+	} else {
+		printf("E: weather insertion failed\n");
+	}
+
+/* 	set_weather(); */
 
 
 	db_close();