164 lines
4.6 KiB
C++
164 lines
4.6 KiB
C++
// Display an Orrery
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// Works for all display sizes but 320x480 minimum size recommended
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// Whole planet orbits only visible in 480 x 800 display
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// Flicker free sprite example for TFT_eSPI:
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// https://github.com/Bodmer/TFT_eSPI
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// Sketch coded by Bodmer
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// Uses astronomy engine created by Don Cross
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#include <TFT_eSPI.h> // Hardware-specific library
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TFT_eSPI tft = TFT_eSPI(); // Invoke library
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TFT_eSprite img = TFT_eSprite(&tft); // Sprite class
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#define sunX tft.width()/2
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#define sunY tft.height()/2
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uint16_t orb_inc;
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uint16_t planet_r;
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#include <stdio.h>
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#include "astronomy.h"
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#define TIME_TEXT_BYTES 25
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astro_time_t astro_time;
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uint16_t grey;
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static const astro_body_t body[] = {
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BODY_SUN, BODY_MERCURY, BODY_VENUS, BODY_EARTH, BODY_MARS,
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BODY_JUPITER, BODY_SATURN, BODY_URANUS, BODY_NEPTUNE
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};
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static const uint16_t bodyColour[] = {
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TFT_YELLOW, TFT_DARKGREY, TFT_ORANGE, TFT_BLUE, TFT_RED,
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TFT_GOLD, TFT_BROWN, TFT_DARKCYAN, TFT_CYAN
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};
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// =========================================================================
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// Setup
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// =========================================================================
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void setup() {
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Serial.begin(115200);
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tft.begin();
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tft.setRotation(1);
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tft.fillScreen(TFT_BLACK);
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// Test with smaller display sizes
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//tft.setViewport(10,10,160,128);
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//tft.setViewport(10,10,320,240);
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//tft.setViewport(10,10,480,320);
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//tft.frameViewport(TFT_GREEN, -1);
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img.createSprite(19, 19);
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grey = tft.color565(30, 30, 30);
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astro_time = Astronomy_MakeTime(2020, 10, 16, 19, 31, 0) ;
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tft.fillCircle(sunX, sunY, 10, TFT_YELLOW);
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// i initialised to 1 so Sun is skipped
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for (int i = 1; i < sizeof(body) / sizeof(body[0]); ++i)
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{
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tft.drawCircle(sunX, sunY, i * 28, grey);
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}
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}
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// =========================================================================
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// Loop
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// =========================================================================
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void loop() {
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uint32_t dt = millis();
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plot_planets();
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showTime(astro_time);
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// Add time increment (more than 0.6 days will lead to stray pixel on screen
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// due to the way previous object images are erased)
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astro_time = Astronomy_AddDays(astro_time, 0.25); // 0.25 day (6 hour) increment
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dt = millis()-dt;
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//Serial.println(dt);
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//delay(1000);
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}
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// =========================================================================
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// Get coordinates of end of a vector, pivot at x,y, length r, angle a
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// =========================================================================
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// Coordinates are returned to caller via the xp and yp pointers
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#define DEG2RAD 0.0174532925
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void getCoord(int x, int y, int *xp, int *yp, int r, float a)
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{
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float sx1 = cos( -a * DEG2RAD );
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float sy1 = sin( -a * DEG2RAD );
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*xp = sx1 * r + x;
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*yp = sy1 * r + y;
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}
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// =========================================================================
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// Convert astronomical time to UTC and display
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// =========================================================================
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void showTime(astro_time_t time)
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{
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astro_status_t status;
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char text[TIME_TEXT_BYTES];
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status = Astronomy_FormatTime(time, TIME_FORMAT_SECOND, text, sizeof(text));
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if (status != ASTRO_SUCCESS)
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{
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fprintf(stderr, "\nFATAL(PrintTime): status %d\n", status);
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exit(1);
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}
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tft.drawString(text, 0, 0, 2);
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}
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// =========================================================================
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// Plot planet positions as an Orrery
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// =========================================================================
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int plot_planets(void)
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{
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astro_angle_result_t ang;
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int i;
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int num_bodies = sizeof(body) / sizeof(body[0]);
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// i initialised to 1 so Sun is skipped
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for (i = 1; i < num_bodies; ++i)
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{
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ang = Astronomy_EclipticLongitude(body[i], astro_time);
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int x1 = 0; // getCoord() will update these
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int y1 = 0;
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getCoord(0, 0, &x1, &y1, i * 28, ang.angle); // Get x1 ,y1
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img.fillSprite(TFT_TRANSPARENT);
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img.fillCircle(9, 9, 9, TFT_BLACK);
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img.drawCircle(9 - x1, 9 - y1, i * 28, grey);
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img.fillCircle(9, 9, 5, bodyColour[i]);
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img.pushSprite(sunX + x1 - 9, sunY + y1 - 9, TFT_TRANSPARENT);
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if (body[i] == BODY_EARTH)
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{
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astro_angle_result_t mang = Astronomy_LongitudeFromSun(BODY_MOON, astro_time);
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int xm = 0;
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int ym = 0;
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getCoord(x1, y1, &xm, &ym, 15, 180 + ang.angle + mang.angle); // Get x1 ,y1
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img.fillSprite(TFT_TRANSPARENT);
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img.fillCircle(9, 9, 7, TFT_BLACK);
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img.drawCircle(9 - xm, 9 - ym, i * 28, grey);
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img.fillCircle(9, 9, 2, TFT_WHITE);
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img.pushSprite(sunX + xm - 9, sunY + ym - 9, TFT_TRANSPARENT);
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}
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}
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return 0;
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}
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