Diff: CalendarPage.cpp

Revision:

0:a3fc9e34ea9c

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/CalendarPage.cpp	Sun Apr 22 19:56:03 2018 +0000
@@ -0,0 +1,82 @@
+
+
+#include "CalendarPage.h"
+
+
+CalendarPage::CalendarPage(uint8_t Month, uint16_t Year) {
+    month = Month;
+    year = Year;
+    verbose = false;
+    Compute(month, year);
+}
+
+
+// 37 Elements with Array index 0 to 36,
+//    populated with 0 or the day number 
+//
+//  0  1  2  3  4  5  6     |                       1
+//  7  8  9 10 11 12 13     |     2  3  4  5  6  7  8
+// 14 15 16 17 18 19 20     |     9 10 11 12 13 14 15
+// 21 22 23 24 25 26 27     |    16 17 18 19 20 21 22
+// 28 29 30 31 32 33 34     |    23 24 25 26 27 28 29
+// 35 36                    |    30 31
+//
+void CalendarPage::Compute(uint8_t Month, uint16_t Year) {
+    const int DaysInMonth[] = { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
+    const char * MonthName[] = { "", "January", "February", "March", "April", "May", "June",
+        "July", "August", "September", "October", "November", "December" };
+    const char * DayName[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
+    int NumberOfDaysInMonth;
+    int FirstDayOfMonth = 0;
+    int DayOfWeekCounter = 0;
+    int DateCounter = 1;
+    int index = 0;
+    int day = 1;
+
+    month = Month;
+    year = Year;
+    int y = year - (14 - month) / 12;
+    int m = month + 12 * ((14 - month) / 12) - 2;
+
+    firstday = (day + y + y / 4 - y / 100 + y / 400 + (31 * m / 12)) % 7;
+    if ( (month == 2) && (year % 400 == 0 || (year % 4 == 0 && year % 100 != 0)) ) {
+        NumberOfDaysInMonth = 29;
+    } else {
+        NumberOfDaysInMonth = DaysInMonth[month];
+    }
+
+    if (verbose) {
+        printf("%20s %d\r\n", MonthName[month], year);
+        for (int d = 0; d < 7; d++) {
+            printf("%4s", DayName[d]);
+        }
+        printf("\r\n");
+    }
+
+    memset(DayMap, 0, sizeof(DayMap));
+    for (FirstDayOfMonth = 0; FirstDayOfMonth < firstday; ++FirstDayOfMonth) {
+        if (verbose)
+            printf("%4s", "");
+        DayMap[index++] = 0;
+    }
+
+    int tempfirstday = firstday;
+    DateCounter = 1;
+    DayOfWeekCounter = tempfirstday;
+    //This loop represents the date display and will continue to run until
+    //the number of days in that month have been reached
+    for (DateCounter = 1; DateCounter <= NumberOfDaysInMonth; ++DateCounter) {
+        DayMap[index++] = DateCounter;
+        if (verbose)
+            printf("%4d", DateCounter);
+        ++DayOfWeekCounter;
+        if (DayOfWeekCounter > 6 && DateCounter != NumberOfDaysInMonth) {
+            if (verbose) 
+                printf("\r\n");
+            DayOfWeekCounter = 0;
+        }
+    }
+    if (verbose)
+        printf("\r\n");
+    tempfirstday = DayOfWeekCounter + 1;
+}