pimoroni-pico/examples/tufty2040/tufty2040_drawing.cpp

#include "pico/stdlib.h"
#include <stdio.h>
#include <cstring>
#include <string>
#include <algorithm>
#include "pico/time.h"
#include "pico/platform.h"

#include "common/pimoroni_common.hpp"
#include "drivers/st7789/st7789.hpp"
#include "libraries/pico_graphics/pico_graphics.hpp"
#include "tufty2040.hpp"
#include "button.hpp"

using namespace pimoroni;

Tufty2040 tufty;

ST7789 st7789(
  Tufty2040::WIDTH,
  Tufty2040::HEIGHT,
  ROTATE_0,
  ParallelPins{
    Tufty2040::LCD_CS,
    Tufty2040::LCD_DC,
    Tufty2040::LCD_WR,
    Tufty2040::LCD_RD,
    Tufty2040::LCD_D0, 
    Tufty2040::BACKLIGHT
  }
);

PicoGraphics_PenRGB332 graphics(st7789.width, st7789.height, nullptr);

Button button_a(Tufty2040::A);
Button button_b(Tufty2040::B);
Button button_c(Tufty2040::C);
Button button_up(Tufty2040::UP);
Button button_down(Tufty2040::DOWN);

uint32_t time() {
  absolute_time_t t = get_absolute_time();
  return to_ms_since_boot(t);
}

// HSV Conversion expects float inputs in the range of 0.00-1.00 for each channel
// Outputs are rgb in the range 0-255 for each channel
void from_hsv(float h, float s, float v, uint8_t &r, uint8_t &g, uint8_t &b) {
  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;
  }
}

int main() {
  st7789.set_backlight(255);

  Pen WHITE = graphics.create_pen(255, 255, 255);
  Pen BG = graphics.create_pen(120, 40, 60);

  struct pt {
    float      x;
    float      y;
    uint8_t    r;
    float     dx;
    float     dy;
    uint16_t pen;
  };

  std::vector<pt> shapes;
  for(int i = 0; i < 100; i++) {
    pt shape;
    shape.x = rand() % graphics.bounds.w;
    shape.y = rand() % graphics.bounds.h;
    shape.r = (rand() % 10) + 3;
    shape.dx = float(rand() % 255) / 64.0f;
    shape.dy = float(rand() % 255) / 64.0f;
    shape.pen = graphics.create_pen(rand() % 255, rand() % 255, rand() % 255);
    shapes.push_back(shape);
  }

  Point text_location(0, 0);
  uint8_t i = 0;

  while(true) {
    
    graphics.set_pen(BG);
    graphics.clear();

    for(auto &shape : shapes) {
      shape.x += shape.dx;
      shape.y += shape.dy;
      if((shape.x - shape.r) < 0) {
        shape.dx *= -1;
        shape.x = shape.r;
      }
      if((shape.x + shape.r) >= graphics.bounds.w) {
        shape.dx *= -1;
        shape.x = graphics.bounds.w - shape.r;
      }
      if((shape.y - shape.r) < 0) {
        shape.dy *= -1;
        shape.y = shape.r;
      }
      if((shape.y + shape.r) >= graphics.bounds.h) {
        shape.dy *= -1;
        shape.y = graphics.bounds.h - shape.r;
      }

      graphics.set_pen(shape.pen);
      graphics.circle(Point(shape.x, shape.y), shape.r);

    }


    graphics.set_pen(WHITE);
    graphics.text("Hello World", text_location, 320);

    // update screen
    st7789.update(&graphics);

    i+=10;
    tufty.led(i);
  }

    return 0;
}