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displayXY_t ::displayXY_t(display_t &disp,
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displayXY_t ::displayXY_t(display_t &disp,
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                          int xmin, int xmax, int ymin, int ymax) : display(disp), x_min(xmin), x_max(xmax), y_min(ymin), y_max(ymax),
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                          int xmin, int xmax, int ymin, int ymax) : display(disp), x_min(xmin), x_max(xmax), y_min(ymin), y_max(ymax),
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                                                                    left_margin(MARGIN), right_margin(display.width() - MARGIN), plot_width(right_margin - left_margin),
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                                                                    left_margin(MARGIN), right_margin(display.width() - MARGIN), plot_width(right_margin - left_margin),
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                                                                    top_margin(MARGIN), bottom_margin(display.height() - BOTTOM_MARGIN), plot_height(bottom_margin - top_margin), next_persist(0)
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                                                                    top_margin(MARGIN), bottom_margin(display.height() - BOTTOM_MARGIN), plot_height(bottom_margin - top_margin), next_persist(0)
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{
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{
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    for (uint8_t i = 0; i < PERSIST;  i++)
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    for (uint16_t i = 0; i < PERSIST;  i++)
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    {
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    {
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        persist_x[i] = left_margin;
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        persist_x[i] = left_margin;
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        persist_y[i] = bottom_margin;
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        persist_y[i] = bottom_margin;
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    }
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    }
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};
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};
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{
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{
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    int y_coord = (plot_height * (y - y_min)) / (y_max - y_min);
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    int y_coord = (plot_height * (y - y_min)) / (y_max - y_min);
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    int x_coord = (plot_width * (x - x_min)) / (x_max - x_min);
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    int x_coord = (plot_width * (x - x_min)) / (x_max - x_min);
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    display.drawLine(left_margin, y_coord, right_margin, y_coord, WHITE, 0b111000);
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    display.drawLine(left_margin, y_coord, right_margin, y_coord, WHITE, 0b111000);
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    display.drawLine(x_coord, top_margin, x_coord, bottom_margin, WHITE, 0b111000);
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    display.drawLine(x_coord, top_margin, x_coord, bottom_margin, WHITE, 0b111000);
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    // imitate persistent plot
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    persist_x[next_persist] = x_coord;
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    persist_x[next_persist] = x_coord;
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    persist_y[next_persist] = y_coord;
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    persist_y[next_persist] = y_coord;
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    next_persist++;
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    next_persist++;
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    if (next_persist > PERSIST)
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    if (next_persist > PERSIST)
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        next_persist = 0;
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        next_persist = 0;
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 - 
 
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    for (uint8_t i = 0; i < PERSIST; i++)
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    for (uint16_t i = 0; i < PERSIST; i++)
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    {
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    {
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        display.drawPixel(persist_x[i], persist_y[i], WHITE);
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        display.drawPixel(persist_x[i], persist_y[i], WHITE);
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    }
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    }
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    if(message)
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    if(message)
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    display.gotoxy(0, 48);
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    display.gotoxy(0, 48);
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    display.printString(large_font, message, 0, OVERLAY);
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    display.printString(large_font, message, 0, OVERLAY);
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    }
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    }
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    if (message_upper)
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    if (message_upper)
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    {
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    {
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    display.gotoxy(64,48);
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    display.gotoxy(56,48);
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    display.printString(small_font, message_upper, 0, OVERLAY);
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    display.printString(small_font, message_upper, 0, OVERLAY);
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    }
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    }
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    if (message_lower)
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    if (message_lower)
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    {
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    {
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    display.gotoxy(64,56);
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    display.gotoxy(56,56);
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    display.printString(small_font, message_lower, 0, OVERLAY);
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    display.printString(small_font, message_lower, 0, OVERLAY);
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    }
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    }
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}
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}