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/**
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/**
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 * draw a compass rose at <x>/<y> for <heading>
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 * draw a compass rose at <x>/<y> for <heading>
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 */
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 */
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void draw_compass(uint8_t x, uint8_t y, uint16_t heading) {
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void draw_compass(uint8_t x, uint8_t y, uint16_t heading) {
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    //char* rose = "---N---O---S---W---N---O---S---W---N---O---S---W";
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    //char* rose = "---N---O---S---W---N---O---S---W---N---O---S---W";
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    static char rose[] PROGMEM = {216, 215, 216, 211, 216, 215, 216, 213, 216, 215, 216, 212,
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    static const char rose[] PROGMEM = {216, 215, 216, 211, 216, 215, 216, 213, 216, 215, 216, 212,
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        216, 215, 216, 214, 216, 215, 216, 211, 216, 215, 216, 213,
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        216, 215, 216, 214, 216, 215, 216, 211, 216, 215, 216, 213,
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        216, 215, 216, 212, 216, 215, 216, 214, 216, 215, 216, 211,
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        216, 215, 216, 212, 216, 215, 216, 214, 216, 215, 216, 211,
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        216, 215, 216, 213, 216, 215, 216, 212, 216, 215, 216, 214};
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        216, 215, 216, 213, 216, 215, 216, 212, 216, 215, 216, 214};
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    // the center is char 19 (north), we add the current heading in 8th
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    // the center is char 19 (north), we add the current heading in 8th
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    // which would be 22.5 degrees, but float would bloat up the code
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    // which would be 22.5 degrees, but float would bloat up the code
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        if (chr < 0x74) chr = 0x74;
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        if (chr < 0x74) chr = 0x74;
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    }
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    }
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    write_char_xy(x, y, chr);
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    write_char_xy(x, y, chr);
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}
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}
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// big vario arrays
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// big vario array
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const char vario_00[5] PROGMEM = {0x00, 0x00, 0xc2, 0xff, 0xff};
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const char vario_pnt[15][5] PROGMEM = {
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const char vario_01[5] PROGMEM = {0x00, 0x00, 0xc2, 0xff, 0xc0};
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        {0x00, 0x00, 0xc2, 0xff, 0xff},
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const char vario_02[5] PROGMEM = {0x00, 0x00, 0xc2, 0xff, 0xc1};
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        {0x00, 0x00, 0xc2, 0xff, 0xc0},
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const char vario_03[5] PROGMEM = {0x00, 0x00, 0xc2, 0xff, 0x00};
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        {0x00, 0x00, 0xc2, 0xff, 0xc1},
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const char vario_04[5] PROGMEM = {0x00, 0x00, 0xc2, 0xc0, 0x00};
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        {0x00, 0x00, 0xc2, 0xff, 0x00},
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const char vario_05[5] PROGMEM = {0x00, 0x00, 0xc2, 0xc1, 0x00};
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        {0x00, 0x00, 0xc2, 0xc0, 0x00},
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const char vario_06[5] PROGMEM = {0x00, 0x00, 0xc2, 0x00, 0x00};
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        {0x00, 0x00, 0xc2, 0xc1, 0x00},
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const char vario_07[5] PROGMEM = {0x00, 0x00, 0xbb, 0x00, 0x00};
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        {0x00, 0x00, 0xc2, 0x00, 0x00},
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const char vario_08[5] PROGMEM = {0x00, 0x00, 0xc3, 0x00, 0x00};
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        {0x00, 0x00, 0xbb, 0x00, 0x00},
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const char vario_09[5] PROGMEM = {0x00, 0xc4, 0xc3, 0x00, 0x00};
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        {0x00, 0x00, 0xc3, 0x00, 0x00},
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const char vario_10[5] PROGMEM = {0x00, 0xc5, 0xc3, 0x00, 0x00};
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        {0x00, 0xc4, 0xc3, 0x00, 0x00},
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const char vario_11[5] PROGMEM = {0x00, 0xff, 0xc3, 0x00, 0x00};
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        {0x00, 0xc5, 0xc3, 0x00, 0x00},
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const char vario_12[5] PROGMEM = {0xc4, 0xff, 0xc3, 0x00, 0x00};
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        {0x00, 0xff, 0xc3, 0x00, 0x00},
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const char vario_13[5] PROGMEM = {0xc5, 0xff, 0xc3, 0x00, 0x00};
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        {0xc4, 0xff, 0xc3, 0x00, 0x00},
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const char vario_14[5] PROGMEM = {0xff, 0xff, 0xc3, 0x00, 0x00};
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const char* vario_pnt[15] PROGMEM = {vario_00, vario_01, vario_02, vario_03, vario_04,
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        {0xc5, 0xff, 0xc3, 0x00, 0x00},
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    vario_05, vario_06, vario_07, vario_08,
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    vario_09, vario_10, vario_11, vario_12,
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        {0xff, 0xff, 0xc3, 0x00, 0x00}
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    vario_13, vario_14};
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};
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/**
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/**
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 * draw a bigger vario with middle at <x>/<y> acording to <variometer>
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 * draw a bigger vario with middle at <x>/<y> acording to <variometer>
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 */
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 */
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void draw_big_variometer(uint8_t x, uint8_t y, int16_t variometer) {
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void draw_big_variometer(uint8_t x, uint8_t y, int16_t variometer) {
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    int16_t index = 7 + variometer;
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    int16_t index = 7 + variometer;
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    if (index > 14) index = 14;
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    if (index > 14) index = 14;
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    else if (index < 0) index = 0;
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    else if (index < 0) index = 0;
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    write_string_pgm_down(x, y - 2, (const char *)(pgm_read_word(&(vario_pnt[index]))), 5);
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    write_string_pgm_down(x, y - 2, vario_pnt[index], 5);