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added check for empty result; minor stuff
author meillo@marmaro.de
date Sun, 27 Jul 2008 21:34:54 +0200
parents 5937504619f2
children
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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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7 enum {
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8 Nlast = 2,
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9 };
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10
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11 enum { Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec };
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12
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13 struct weather {
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14 float temp;
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15 float sun;
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16 float rain;
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17 float wind;
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18 float hum;
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19 };
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20
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21 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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22 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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23 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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24 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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25 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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28 /* generates random number between -limit and +limit */
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29 float rand_limit(float limit) {
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30 int r;
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31
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32 r = rand() / ( ((float) RAND_MAX + 1) / (2*limit) );
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33 return r - limit;
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34 }
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39 void getlastweather(struct weather lastw[], int nlast) {
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40 char query[512];
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41 int i;
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42
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43 sprintf(query,
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44 " select temp, sun, rain, wind, hum from weather "
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45 " order by tick desc "
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46 " limit %d "
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47 , nlast
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48 );
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49 stmt = 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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61 void genweather(struct weather* w, struct weather lastw[], int nlast, int month) {
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62 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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63 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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64 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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65 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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66 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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67 }
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70 int setweather(struct weather* w) {
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71 char query[512];
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72 sprintf(query,
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73 " insert into weather "
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74 " (tick, temp, sun, rain, wind, hum) "
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75 " values ('%d', '%f', '%f', '%f', '%f', '%f') "
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76 , gametime, w->temp, w->sun, w->rain, w->wind, w->hum
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77 );
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78 if (!db_update(query)) {
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79 db_error("weather insertion");
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80 return 0;
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81 }
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82 return 1;
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83 }
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86 int weather(void) {
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87 struct weather w;
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88 struct weather lastn[Nlast];
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89
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90 getlastweather(lastn, Nlast);
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91 genweather(&w, lastn, Nlast, May);
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92 return setweather(&w);
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93 /* FIXME: include all functions in return value */
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94 }