feat(plot): nice-number ticks, axes, grid, traces, cursors, measurement queries

src/plot/axis.cpp

@@ -0,0 +1,18 @@
+#include <plot/plot/axis.hpp>
+
+namespace plot {
+
+void Axis::refresh(f32 px, f32 min_px, bool include_minors) {
+  generate_ticks(range, px, min_px, ticks, include_minors);
+  if (format != TickFormat::Time) return;
+  // generate_ticks labels with format_si; a time axis relabels its majors here,
+  // because the tick generator has no business knowing about a clock.
+  char buf[64];
+  for (Tick& tick : ticks) {
+    if (!tick.major) continue;
+    format_time(tick.value, buf, sizeof buf);
+    tick.label = buf;
+  }
+}
+
+}  // namespace plot