pimoroni-pico/examples/breakout_roundlcd/roundlcd_demo.cpp

83 lines
2.1 KiB
C++

#include <string.h>
#include <math.h>
#include <vector>
#include <cstdlib>
#include "drivers/st7789/st7789.hpp"
#include "libraries/pico_graphics/pico_graphics.hpp"
#include "time.h"
// Place a 1.3 Round SPI LCD in the *front* slot of breakout garden.
using namespace pimoroni;
const int WIDTH = 240;
const int HEIGHT = 240;
ST7789 st7789(WIDTH, HEIGHT, ROTATE_0, true, get_spi_pins(BG_SPI_FRONT));
PicoGraphics_PenRGB332 graphics(st7789.width, st7789.height, nullptr);
constexpr float RADIUS = WIDTH / 2;
Pen from_hsv(float h, float s, float v) {
uint8_t r = 0, g = 0, b = 0;
float i = floor(h * 6.0f);
float f = h * 6.0f - i;
v *= 255.0f;
uint8_t p = v * (1.0f - s);
uint8_t q = v * (1.0f - f * s);
uint8_t t = v * (1.0f - (1.0f - f) * s);
switch (int(i) % 6) {
case 0: r = v; g = t; b = p; break;
case 1: r = q; g = v; b = p; break;
case 2: r = p; g = v; b = t; break;
case 3: r = p; g = q; b = v; break;
case 4: r = t; g = p; b = v; break;
case 5: r = v; g = p; b = q; break;
}
return graphics.create_pen(r, g, b);
}
int main() {
st7789.set_backlight(255);
uint32_t steps = 70;
float angle_step = 0.5f;
Pen BLACK = graphics.create_pen(0, 0, 0);
Pen WHITE = graphics.create_pen(255, 255, 255);
while(1) {
absolute_time_t at = get_absolute_time();
uint64_t t = to_us_since_boot(at) / 100000;
float angle = (t % 360) * M_PI / 180.0f;
graphics.set_pen(BLACK);
graphics.clear();
graphics.set_pen(WHITE);
for(auto step = 0u; step < steps; step++) {
auto distance = RADIUS / steps * step;
distance += step * 0.2f;
angle += angle_step;
unsigned int x = RADIUS + (distance * cosf(angle));
unsigned int y = RADIUS + (distance * sinf(angle));
auto l = 2.0 + (((sin((t / 2.0f) + angle) + 1) / 2.0f) * 8.0f);
auto p = from_hsv((t / 10.0f) + distance / 120.0f, 1.0, 1.0);
graphics.set_pen(p);
graphics.circle(Point(x, y), l);
}
st7789.update(&graphics);
sleep_ms(10);
}
}