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#include <GxEPD2_BW.h>
#include <U8g2_for_Adafruit_GFX.h>
#include <HTTPClient.h>
#include <ArduinoJson.h>
#include "weather-icons.h"
#include "secrets.h"
/* Position for Durlach */
#define lat 48.999
#define lon 8.474
#define FONTSIZE 10
#define SPACING 5
#define DIM(w, h) (((w) << 16) | (h))
#define GETW(dim) ((dim) >> 16)
#define GETH(dim) ((dim) & 0xffff)
extern GxEPD2_GFX_BASE_CLASS &get_display();
extern U8G2_FOR_ADAFRUIT_GFX u8g2Fonts;
static StaticJsonDocument<16000> weather_json;
static DeserializationError json_state = DeserializationError::IncompleteInput;
void fetch_weather() {
/* use HTTP intentionally for simplicity
don't use on insecure networks */
String url = "http://api.openweathermap.org/data/2.5/onecall?units=metric&lang=de&exclude=minutely,hourly";
url += "&appid=" + String(openweathermap_apikey);
url += "&lat=" + String(lat);
url += "&lon=" + String(lon);
HTTPClient http;
http.begin(url);
int status = http.GET();
String weather_info = "";
if (status == HTTP_CODE_OK) {
weather_info = http.getString();
} else {
Serial.println("http error\r\n");
}
http.end();
json_state = deserializeJson(weather_json, weather_info);
if (json_state != DeserializationError::Ok) {
Serial.println("json deserialization error\r\n");
}
}
static uint32_t draw_icon(int16_t x, int16_t y, const unsigned char *image, uint16_t width, uint16_t height) {
get_display().drawXBitmap(x, y, image, width, height, GxEPD_BLACK);
return DIM(width, height);
}
static uint32_t draw_weather_icon(int16_t x, int16_t y, int code) {
const unsigned char *image = NULL;
uint16_t width = 0, height = 0;
int icon_group = code / 100;
switch (icon_group) {
case 2:
image = thunderstorm_bits;
width = thunderstorm_width;
height = thunderstorm_height;
break;
case 3:
case 5:
image = rain_bits;
width = rain_width;
height = rain_height;
break;
case 6:
image = snow_bits;
width = snow_width;
height = snow_height;
break;
case 7:
image = fog_bits;
width = fog_width;
height = fog_height;
break;
case 8:
image = cloudy_bits;
width = cloudy_width;
height = cloudy_height;
break;
}
if (code == 800 || !image) {
/* special case, clear sky / no clouds */
image = sunny_bits;
width = sunny_width;
height = sunny_height;
}
return draw_icon(x, y, image, width, height);
}
static uint32_t draw_temperature(int16_t x, int16_t y, float temp, float temp_max = 0.0) {
uint16_t w = thermometer_width, h = thermometer_height;
int text_width = 0;
draw_icon(x, y, thermometer_bits, w, h);
u8g2Fonts.setCursor(x + w + SPACING, y + h/2 + FONTSIZE/2);
if (temp_max > 0) {
u8g2Fonts.printf("%.1f - %.1f °C", temp, temp_max);
text_width = u8g2Fonts.getUTF8Width("88.8 - 88.8 °C");
} else {
u8g2Fonts.printf("%.1f °C", temp);
text_width = u8g2Fonts.getUTF8Width("88.8 °C");
}
return DIM(w + SPACING + text_width, h);
}
static uint32_t draw_humidity(int16_t x, int16_t y, int humidity) {
uint16_t w = humidity_width, h = humidity_height;
draw_icon(x, y, humidity_bits, w, h);
u8g2Fonts.setCursor(x + w + SPACING, y + h/2 + FONTSIZE/2);
u8g2Fonts.printf("%d %%", humidity);
return DIM(w, h);
}
static uint32_t draw_rain_prob(int16_t x, int16_t y, uint8_t rain) {
uint16_t w = raindrops_width, h = raindrops_width;
draw_icon(x, y, raindrops_bits, w, h);
u8g2Fonts.setCursor(x + w + SPACING, y + h/2 + FONTSIZE/2);
u8g2Fonts.printf("%d %%", rain);
int text_width = u8g2Fonts.getUTF8Width("88 %");
return DIM(w + SPACING + text_width, h);
}
static uint32_t draw_pressure(int16_t x, int16_t y, int pressure) {
uint16_t w = barometer_width, h = barometer_height;
draw_icon(x, y, barometer_bits, w, h);
u8g2Fonts.setCursor(x + w + SPACING, y + h/2 + FONTSIZE/2);
u8g2Fonts.printf("%d hPa", pressure);
return DIM(w, h);
}
static uint32_t draw_clouds(int16_t x, int16_t y, int clouds) {
uint16_t w = cloud_width, h = cloud_height;
draw_icon(x, y, cloud_bits, w, h);
u8g2Fonts.setCursor(x + w + SPACING, y + h/2 + FONTSIZE/2);
u8g2Fonts.printf("%d %%", clouds);
int text_width = u8g2Fonts.getUTF8Width("88 %");
return DIM(w + SPACING + text_width, h);
}
static int draw_weather_forecast(int16_t x, int16_t y, const char *title, const JsonObject &json) {
auto temp_min = json["temp"]["min"].as<float>();
auto temp_max = json["temp"]["max"].as<float>();
auto pop = (uint8_t) (100 * json["pop"].as<float>());
auto cloudiness = json["clouds"].as<int>();
auto description = json["weather"][0]["description"].as<char *>();
/* line 1 */
u8g2Fonts.setFont(u8g2_font_helvB10_tf);
u8g2Fonts.setCursor(x, y);
u8g2Fonts.print(title);
u8g2Fonts.setFont(u8g2_font_helvR10_tf);
u8g2Fonts.print(" ");
u8g2Fonts.print(description);
/* line 2 */
uint32_t dim = 0;
y += SPACING;
dim = draw_temperature(x, y, temp_min, temp_max);
x += GETW(dim) + SPACING;
dim = draw_clouds(x, y, cloudiness);
x += GETW(dim) + SPACING;
dim = draw_rain_prob(x, y, pop);
return DIM(0, FONTSIZE + GETH(dim) + 2 * SPACING);
}
void draw_weather(int16_t x0, int16_t y0) {
if (json_state != DeserializationError::Ok)
return;
/* current weather */
auto current_temp = weather_json["current"]["temp"].as<float>();
auto current_weather_id = weather_json["current"]["weather"][0]["id"].as<int>();
auto current_weather_desc = weather_json["current"]["weather"][0]["description"].as<char *>();
auto current_clouds = weather_json["current"]["clouds"].as<int>();
auto current_humidity = weather_json["current"]["humidity"].as<int>();
auto current_pressure = weather_json["current"]["pressure"].as<int>();
if (!current_weather_desc)
current_weather_desc = "N/A";
u8g2Fonts.setFont(u8g2_font_helvR10_tf);
uint32_t dim = 0;
int16_t x1 = x0, y1 = y0;
dim = draw_weather_icon(x0, y0, current_weather_id);
x1 += GETW(dim) + SPACING;
y1 += GETH(dim) + SPACING;
/* line 1 */
int16_t x = x1, y = y0 + 2 * SPACING;
uint32_t temp_dim = draw_temperature(x, y, current_temp);
x += GETW(temp_dim) + 2 * SPACING;
dim = draw_clouds(x, y, current_clouds);
y += GETH(dim);
/* line 2 */
x = x1;
dim = draw_humidity(x, y, current_humidity);
x += GETW(temp_dim) + 2 * SPACING;
dim = draw_pressure(x, y, current_pressure);
y += GETH(dim);
/* forecasts */
x = x0;
y = y1;
dim = draw_weather_forecast(x, y, "Heute:", weather_json["daily"][0]);
y += GETH(dim);
dim = draw_weather_forecast(x, y, "Morgen:", weather_json["daily"][1]);
y += GETH(dim);
dim = draw_weather_forecast(x, y, "Übermorgen:", weather_json["daily"][2]);
y += GETH(dim);
}
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