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#include <GxEPD2_BW.h>
#include <U8g2_for_Adafruit_GFX.h>
#include <ctime>
#define CELL_SPACING 8
extern GxEPD2_GFX_BASE_CLASS &get_display();
extern U8G2_FOR_ADAFRUIT_GFX u8g2Fonts;
static const char *week_days[] {
"Mo", "Di", "Mi", "Do", "Fr", "Sa", "So",
};
static const char *months[] {
"Januar", "Februar", "März", "April", "Mai", "Juni", "Juli",
"August", "September", "Oktober", "November", "Dezember",
};
enum month_t {
JANUARY = 0,
FEBRUARY,
MARCH,
APRIL,
MAY,
JUNE,
JULY,
AUGUST,
SEPTEMBER,
OCTOBER,
NOVEMBER,
DECEMBER,
};
static int days_in_month(int month, int year) {
switch (month) {
case JANUARY:
case MARCH:
case MAY:
case JULY:
case AUGUST:
case OCTOBER:
case DECEMBER:
return 31;
case APRIL:
case JUNE:
case SEPTEMBER:
case NOVEMBER:
return 30;
case FEBRUARY:
if (year % 400 == 0) return 29;
if (year % 100 == 0) return 28;
if (year % 4 == 0) return 29;
}
assert(month >= 0 && month < 12);
return 0;
}
/*
* @x0 absolute initial X coord
* @y0 absolute initial Y coord
* @w0 width of a cell
* @h0 height of a cell
* @xoff X pos of cell
* @yoff Y pos of cell
* @text text to draw
* @highlight whether text should be highlighted
*/
static void draw_cell_content(int16_t x0, int16_t y0, uint16_t w0, uint16_t h0, uint8_t xoff, uint8_t yoff, String &text, bool highlight = false) {
uint16_t w = u8g2Fonts.getUTF8Width(text.c_str());
uint16_t h = 10; /* assume 10px high font */
int16_t w_diff = w0 - w;
int x2 = x0 + xoff * w0 + w_diff/2;
int y2 = y0 + yoff * h0;
u8g2Fonts.setCursor(x2, y2);
u8g2Fonts.print(text);
if (highlight) {
get_display().drawCircle(x2 + w/2, y2 - h/2 - 1, w0/2 - 3, GxEPD_BLACK);
}
}
void draw_calendar(int16_t x0, int16_t y0) {
struct tm now;
if (!getLocalTime(&now)) {
return;
}
uint8_t n_days = days_in_month(now.tm_mon, now.tm_year);
/* on which weekday is the 1st? */
int8_t day_of_1st = ((1 - 7 - (now.tm_mday - now.tm_wday)) % 7) + 7;
/* remap days from So-Sa = 0..6 to Mo-So = 0..6 */
day_of_1st = (day_of_1st - 1 + 7) % 7;
/* determine sizes */
u8g2Fonts.setFont(u8g2_font_helvB10_tf);
uint16_t cell_width, cell_height;
int w = u8g2Fonts.getUTF8Width(week_days[0]);
int h = 10; /* assume 10px high font */
cell_width = w + CELL_SPACING;
cell_height = h + CELL_SPACING + 5;
/* draw title with month and year */
u8g2Fonts.setFont(u8g2_font_helvB14_tf);
String title_text = String(months[now.tm_mon]) + " " + String(1900 + now.tm_year);
draw_cell_content(x0, y0, cell_width * 7, h, 0, 0, title_text);
y0 += h + 2 * CELL_SPACING;
/* draw table header with week days */
u8g2Fonts.setFont(u8g2_font_helvB10_tf);
for (int i=0; i<7; i++) {
String week_day = String(week_days[i]);
draw_cell_content(x0, y0, cell_width, cell_height, i, 0, week_day);
}
/* draw days */
u8g2Fonts.setFont(u8g2_font_helvR10_tf);
int8_t wday = day_of_1st;
uint8_t row = 1;
for (uint8_t day = 1; day <= n_days; day++) {
String day_str = String(day);
draw_cell_content(x0, y0, cell_width, cell_height, wday, row, day_str, day == now.tm_mday);
wday++;
if (wday > 6) {
wday = 0;
row++;
}
}
}
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