add usage of text

src/core/gfx.cpp

@@ -42,7 +42,7 @@ draw::color_t interpolateColor(double value,
   return stops.back().color;
 }
 
-#ifdef CONFIG_METRIC
+
 draw::color_t get_altitude_color(uint32_t value) {
   static constexpr std::array<color_stop, 11> stops = {{
 #ifdef CONFIG_METRIC
@@ -57,8 +57,7 @@ draw::color_t get_altitude_color(uint32_t value) {
       {6000, {40, 175, 215}},
       {9000, {50, 110, 240}},
       {12000, {140, 50, 220}}
-#endif
-#ifndef CONFIG_METRIC
+#else
       {0, {220, 90, 20}},      // Brown/Dark Orange
       {500, {245, 115, 25}},   // Orange
       {1000, {250, 150, 30}},  // Light Orange
@@ -74,7 +73,6 @@ draw::color_t get_altitude_color(uint32_t value) {
   }};
   return interpolateColor(value, stops);
 }
-#endif
 
 enum letter_id {
   LETTER_A,
@@ -171,7 +169,7 @@ void putchar(const char c, uint16_t x, uint16_t y, const draw::color_t color) {
     y++;
   }
 }
-void puts(const std::string &s, uint16_t x, uint16_t y, draw::color_t color) {
+void puts(const std::string &s, const uint16_t x, const uint16_t y, const draw::color_t color) {
   for (size_t i = 0; i < s.length(); i++) {
     putchar(s[i], x+((FONT_WIDTH+CONFIG_CHARACTER_SPACING)*i), y, color);
   }