1 #include <stdio.h>

2 #include <stdlib.h>

3 #include <time.h>

4 #include "db.h"

5 #include "game.h"

6

7

8 enum {

9 Nlast = 2,

10 };

11

12 enum { Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec };

13

14 struct weather {

15 float temp;

16 float sun;

17 float rain;

18 float wind;

19 float hum;

20 };

21

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};

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};

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};

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};

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};

27

28

29 float rand_limit(float limit) {

30 /* generates random number between -limit and +limit */

31 int r;

32

33 r = rand() / ( ((float) RAND_MAX + 1) / (2*limit) );

34 return r - limit;

35 }

36

37

38

39

40 void getlastweather(struct weather lastw[], int nlast) {

41 char query[512];

42 int i;

43

44 sprintf(query,

45 " select temp, sun, rain, wind, hum from weather "

46 " order by tick desc "

47 " limit %d "

48 , nlast);

49 db_query(query);

50 for (i = 0; i < nlast && sqlite3_step(stmt) == SQLITE_ROW; i++) {

51 lastw[i].temp = sqlite3_column_double(stmt, 0);

52 lastw[i].sun = sqlite3_column_double(stmt, 1);

53 lastw[i].rain = sqlite3_column_double(stmt, 2);

54 lastw[i].wind = sqlite3_column_double(stmt, 3);

55 lastw[i].hum = sqlite3_column_double(stmt, 4);

56 }

57 sqlite3_finalize(stmt);

58

59 /*

60 result = mysql_store_result(conn);

61 for (i = 0; i < nlast && (row = mysql_fetch_row(result)); i++) {

62 lastw[i].temp = atof(row[0]);

63 lastw[i].sun = atof(row[1]);

64 lastw[i].rain = atof(row[2]);

65 lastw[i].wind = atof(row[3]);

66 lastw[i].hum = atof(row[4]);

67 }

68 mysql_free_result(result);

69 */

70

71 }

72

73

74 void genweather(struct weather* w, struct weather lastw[], int nlast, int month) {

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);

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);

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);

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);

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);

80 }

81

82

83 void setweather(struct weather* w) {

84 char query[512];

85 sprintf(query,

86 " insert into weather "

87 " (tick, temp, sun, rain, wind, hum) "

88 " values ('%d', '%f', '%f', '%f', '%f', '%f') "

89 , gametime, w->temp, w->sun, w->rain, w->wind, w->hum);

90 /* puts(query); */

91 if (!db_update(query)) {

92 printf("error: weather insertion failed: %s\n", sqlite3_errmsg(db));

93 }

94 }

95

96

97 void weather(void) {

98 struct weather w;

99 struct weather lastn[Nlast];

100

101 getlastweather(lastn, Nlast);

102 genweather(&w, lastn, Nlast, May);

103 setweather(&w);

104 }