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annotate weather.c @ 12:8db6497d6065

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merged everything to only one program
author meillo@marmaro.de
date Wed, 23 Jul 2008 15:19:45 +0200
parents 176ee28e7464
children 5e6c9260913a
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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include <time.h>
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4 #include "db.h"
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5 #include "game.h"
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7
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8 enum {
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9 Nlast = 2,
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10 };
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12 enum { Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec };
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13
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14 struct weather {
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15 float temp;
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16 float sun;
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17 float rain;
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18 float wind;
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19 float hum;
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20 };
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21
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22 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};
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23 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};
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24 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};
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25 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};
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26 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};
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29 float rand_limit(float limit) {
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30 /* generates random number between -limit and +limit */
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31 int r;
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32
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33 r = rand() / ( ((float) RAND_MAX + 1) / (2*limit) );
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34 return r - limit;
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35 }
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40 void getlastweather(struct weather lastw[], int nlast) {
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41 char query[512];
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42 int i;
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43
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44 sprintf(query,
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45 " select temp, sun, rain, wind, hum from weather "
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46 " order by tick desc "
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47 " limit %d "
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48 , nlast);
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49 db_query(query);
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50 for (i = 0; i < nlast && sqlite3_step(stmt) == SQLITE_ROW; i++) {
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51 lastw[i].temp = sqlite3_column_double(stmt, 0);
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52 lastw[i].sun = sqlite3_column_double(stmt, 1);
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53 lastw[i].rain = sqlite3_column_double(stmt, 2);
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54 lastw[i].wind = sqlite3_column_double(stmt, 3);
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55 lastw[i].hum = sqlite3_column_double(stmt, 4);
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56 }
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57 sqlite3_finalize(stmt);
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58
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59 /*
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60 result = mysql_store_result(conn);
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61 for (i = 0; i < nlast && (row = mysql_fetch_row(result)); i++) {
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62 lastw[i].temp = atof(row[0]);
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63 lastw[i].sun = atof(row[1]);
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64 lastw[i].rain = atof(row[2]);
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65 lastw[i].wind = atof(row[3]);
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66 lastw[i].hum = atof(row[4]);
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67 }
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68 mysql_free_result(result);
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69 */
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71 }
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74 void genweather(struct weather* w, struct weather lastw[], int nlast, int month) {
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75 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);
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76 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);
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77 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);
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78 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);
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79 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);
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80 }
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82
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83 void setweather(struct weather* w) {
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84 char query[512];
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85 sprintf(query,
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86 " insert into weather "
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87 " (tick, temp, sun, rain, wind, hum) "
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88 " values ('%d', '%f', '%f', '%f', '%f', '%f') "
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89 , gametime, w->temp, w->sun, w->rain, w->wind, w->hum);
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90 /* puts(query); */
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91 if (!db_update(query)) {
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92 printf("error: weather insertion failed: %s\n", sqlite3_errmsg(db));
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93 }
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94 }
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96
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97 void weather(void) {
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98 struct weather w;
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99 struct weather lastn[Nlast];
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100
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101 getlastweather(lastn, Nlast);
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102 genweather(&w, lastn, Nlast, May);
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103 setweather(&w);
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104 }