Display.h

#ifndef DISPLAY_H
#define DISPLAY_H

#include <Arduino.h>
#include <SPI.h>
#include <U8g2lib.h>

// reference for the display code
// https://github.com/olikraus/u8g2/wiki/u8g2reference#drawbox

// initialize display library
U8G2_SSD1306_128X32_UNIVISION_F_SW_I2C u8g2(U8G2_R0, SCL, SDA, U8X8_PIN_NONE);

// output string buffer
char psiString[13];

class Display
{
public:
    static void init() {
        u8g2.begin();
    };

    static void helloWorld() {
        u8g2.firstPage();
        do {
            u8g2.setFont(u8g2_font_helvR14_tr);
            u8g2.drawStr(0,20,"Hello World!!");
        } while ( u8g2.nextPage() );
    };

    static void showPressureSelection(float actual, float target) {
        u8g2.firstPage();
        u8g2.setFont(u8g2_font_helvR14_tr);

        int actualDigit = (int) actual;
        int actualDecimal = (int) (actual * 10) % 10;

        int targetDigit = (int) target;
        int targetDecimal = (int) (target * 10) % 10;

        sprintf(psiString, "%01d.%01d / %01d.%01d psi", targetDigit, targetDecimal, actualDigit, actualDecimal);

        u8g2.drawStr(10, 20, psiString);
    };

    static void showValveOpening(float valve, float valveTarget) {
        int width = (int) (valve * 128 + .5);
        u8g2.drawBox(0, 26, width, 4);
        int targetWidth = (int) (valveTarget * 128 + .5);
        u8g2.drawBox(0, 30, targetWidth, 2);
    };

    static void submit() {
        u8g2.sendBuffer();
    };

};

#endif