Watchy/examples/WatchFaces/StarryHorizon/StarryHorizon.ino

152 lines
5.4 KiB
C++

// STARRY HORIZON for Watchy by SQFMI
// Copyright 2021 Dan Delany dan.delany@gmail.com
// Released under free MIT License : https://github.com/dandelany/watchy-faces/blob/main/LICENSE
#include <Watchy.h> //include the Watchy library
#include <Fonts/FreeSansBold9pt7b.h> //include any fonts you want to use
#include "MadeSunflower39pt7b.h"
#include "stars.h"
#include "settings.h"
#define STAR_COUNT 900
const int horizonY = 150;
const int planetR = 650;
struct xyPoint {
int x;
int y;
};
//Star myStars[STAR_COUNT];
void initStars() {
// The random star field is loaded from PROGMEM - see stars.h
// this is the function that was used to generate the stars in stars.h
// it does not run normally but can be used to re-generate stars with different parameters
// tweak as needed, call this function in init, open serial monitor, and paste the results into stars.h
srand(5287); // randomSeed() is not stable on ESP32, use srand
printf("const Star STARS[] PROGMEM = {\n");
for(int i = 0; i < STAR_COUNT; i++) {
int starX = (rand() % 260) - 30;
int starY = (rand() % 260) - 30;
int radius = 0;
if (i > STAR_COUNT * 0.99) radius = 2;
else if (i > STAR_COUNT * 0.80) radius = 1;
printf(" { %d, %d, %d },\n", starX, starY, radius);
// myStars[i] = { starX, starY, radius };
}
printf("};\n");
}
struct xyPoint rotatePointAround(int x, int y, int ox, int oy, double angle) {
// rotate X,Y point around given origin point by a given angle
// based on https://gist.github.com/LyleScott/e36e08bfb23b1f87af68c9051f985302#file-rotate_2d_point-py-L38
double qx = (double)ox + (cos(angle) * (double)(x - ox)) + (sin(angle) * (double)(y - oy));
double qy = (double)oy + (-sin(angle) * (double)(x - ox)) + (cos(angle) * (double)(y - oy));
struct xyPoint newPoint;
newPoint.x = (int)qx;
newPoint.y = (int)qy;
return newPoint;
}
class StarryHorizon : public Watchy {
public:
StarryHorizon(const watchySettings& s) : Watchy(s) {
// uncomment to re-generate stars
// initStars();
}
void drawWatchFace(){
display.fillScreen(GxEPD_BLACK);
display.fillCircle(100, horizonY + planetR, planetR, GxEPD_WHITE);
drawGrid();
drawStars(STARS);
drawTime();
drawDate();
}
void drawGrid() {
int prevY = horizonY;
for(int i = 0; i < 40; i+= 1) {
int y = prevY + int(abs(sin(double(i) / 10) * 10));
if(y <= 200) {
display.drawFastHLine(0, y, 200, GxEPD_BLACK);
}
prevY = y;
}
int vanishY = horizonY - 25;
for (int x = -230; x < 430; x += 20) {
display.drawLine(x, 200, 100, vanishY, GxEPD_BLACK);
}
}
void drawStars(const Star stars[]) {
// draw field of stars
// rotate stars so that they make an entire revolution once per hour
int minute = (int)currentTime.Minute;
double minuteAngle = ((2.0 * M_PI) / 60.0) * (double)minute;
// printf("Minute %d, angle %f\n", (int)currentTime.Minute, minuteAngle);
for(int starI = 0; starI < STAR_COUNT; starI++) {
int starX = stars[starI].x;
int starY = stars[starI].y;
int starR = stars[starI].r;
struct xyPoint rotated = rotatePointAround(starX, starY, 100, 100, minuteAngle);
if(rotated.x < 0 || rotated.y < 0 || rotated.x > 200 || rotated.y > horizonY) {
continue;
}
if(starR == 0) {
display.drawPixel(rotated.x, rotated.y, GxEPD_WHITE);
} else {
display.fillCircle(rotated.x, rotated.y, starR, GxEPD_WHITE);
}
}
}
void drawTime() {
display.setFont(&MADE_Sunflower_PERSONAL_USE39pt7b);
display.setTextColor(GxEPD_WHITE);
display.setTextWrap(false);
char* timeStr;
asprintf(&timeStr, "%d:%02d", currentTime.Hour, currentTime.Minute);
drawCenteredString(timeStr, 100, 115, false);
free(timeStr);
}
void drawDate() {
String monthStr = monthShortStr(currentTime.Month);
String dayOfWeek = dayShortStr(currentTime.Wday);
display.setFont(&FreeSansBold9pt7b);
display.setTextColor(GxEPD_WHITE);
display.setTextWrap(false);
char* dateStr;
asprintf(&dateStr, "%s %s %d", dayOfWeek.c_str(), monthStr.c_str(), currentTime.Day);
drawCenteredString(dateStr, 100, 140, true);
free(dateStr);
}
void drawCenteredString(const String &str, int x, int y, bool drawBg) {
int16_t x1, y1;
uint16_t w, h;
display.getTextBounds(str, x, y, &x1, &y1, &w, &h);
// printf("bounds: %d x %d y, %d x1 %d y1, %d w, %d h\n", 0, 100, x1, y1, w, h);
display.setCursor(x - w / 2, y);
if(drawBg) {
int padY = 3;
int padX = 10;
display.fillRect(x - (w / 2 + padX), y - (h + padY), w + padX*2, h + padY*2, GxEPD_BLACK);
}
// uncomment to draw bounding box
// display.drawRect(x - w / 2, y - h, w, h, GxEPD_WHITE);
display.print(str);
}
};
StarryHorizon face(settings); //instantiate watchface
void setup() {
face.init(); //call init in setup
}
void loop() {
// this should never run, Watchy deep sleeps after init();
}