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Draw spectrum frequency axis tick marks and labels.

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Also removed horizontal separator bar, narrowed filter range band.
This commit is contained in:
Jared Boone 2015-07-20 21:55:51 -07:00
parent 4aa1c8fb65
commit 9a8552eaeb
1 changed files with 73 additions and 34 deletions
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107
firmware/application/ui_spectrum.hpp
View File

@ -30,6 +30,7 @@
#include "message.hpp"
#include <cstdint>
#include <cmath>
#include <array>
namespace ui {
@ -59,25 +60,81 @@ public:
}
void paint(Painter& painter) override {
const auto r = screen_rect();
clear_background(painter, r);
if( !spectrum_sampling_rate || !spectrum_bins ) {
// Can't draw without non-zero scale.
return;
}
const auto r = screen_rect();
draw_filter_ranges(painter, r);
draw_frequency_ticks(painter, r);
}
private:
static constexpr Dim filter_band_height = 4;
uint32_t spectrum_sampling_rate { 0 };
size_t spectrum_bins { 0 };
uint32_t channel_filter_pass_frequency { 0 };
uint32_t channel_filter_stop_frequency { 0 };
void clear_background(Painter& painter, const Rect r) {
painter.fill_rectangle(r, Color::black());
}
void draw_frequency_ticks(Painter& painter, const Rect r) {
const auto x_center = r.width() / 2;
/*
const auto text = to_string_dec_int(bandwidth, 6);
const Rect tick {
static_cast<Coord>(r.left() + x_center), r.top(),
1, r.height()
};
painter.fill_rectangle(tick, Color::white());
painter.draw_string(
r.pos,
style(),
text
);
*/
constexpr uint32_t tick_count_max = 4;
float rough_tick_interval = float(spectrum_sampling_rate) / tick_count_max;
size_t magnitude = 1;
size_t magnitude_n = 0;
while(rough_tick_interval >= 10.0f) {
rough_tick_interval /= 10;
magnitude *= 10;
magnitude_n += 1;
}
const size_t tick_interval = std::ceil(rough_tick_interval);
size_t tick_offset = tick_interval;
while((tick_offset * magnitude) < spectrum_sampling_rate / 2) {
const Dim pixel_offset = tick_offset * magnitude * spectrum_bins / spectrum_sampling_rate;
const std::string zero_pad =
((magnitude_n % 3) == 0) ? "" :
((magnitude_n % 3) == 1) ? "0" : "00";
const std::string unit =
(magnitude_n >= 6) ? "M" :
(magnitude_n >= 3) ? "k" : "";
const std::string label = to_string_dec_uint(tick_offset) + zero_pad + unit;
const Coord offset_low = static_cast<Coord>(r.left() + x_center - pixel_offset);
const Rect tick_low { offset_low, r.top(), 1, r.height() };
painter.fill_rectangle(tick_low, Color::white());
painter.draw_string({ static_cast<Coord>(offset_low + 2), r.top() }, style(), label );
const Coord offset_high = static_cast<Coord>(r.left() + x_center + pixel_offset);
const Rect tick_high { offset_high, r.top(), 1, r.height() };
painter.fill_rectangle(tick_high, Color::white());
painter.draw_string({ static_cast<Coord>(offset_high + 2), r.top() }, style(), label );
tick_offset += tick_interval;
}
}
void draw_filter_ranges(Painter& painter, const Rect r) {
if( channel_filter_pass_frequency ) {
const auto x_center = r.width() / 2;
const auto pass_offset = channel_filter_pass_frequency * spectrum_bins / spectrum_sampling_rate;
const auto stop_offset = channel_filter_stop_frequency * spectrum_bins / spectrum_sampling_rate;
@ -89,8 +146,8 @@ public:
const auto stop_x_hi = x_center + stop_offset;
const Rect r_stop_lo {
static_cast<Coord>(r.left() + stop_x_lo), r.top(),
static_cast<Dim>(pass_x_lo - stop_x_lo), r.height()
static_cast<Coord>(r.left() + stop_x_lo), static_cast<Coord>(r.bottom() - filter_band_height),
static_cast<Dim>(pass_x_lo - stop_x_lo), filter_band_height
};
painter.fill_rectangle(
r_stop_lo,
@ -98,8 +155,8 @@ public:
);
const Rect r_stop_hi {
static_cast<Coord>(r.left() + pass_x_hi), r.top(),
static_cast<Dim>(stop_x_hi - pass_x_hi), r.height()
static_cast<Coord>(r.left() + pass_x_hi), static_cast<Coord>(r.bottom() - filter_band_height),
static_cast<Dim>(stop_x_hi - pass_x_hi), filter_band_height
};
painter.fill_rectangle(
r_stop_hi,
@ -108,33 +165,15 @@ public:
}
const Rect r_pass {
static_cast<Coord>(r.left() + pass_x_lo), r.top(),
static_cast<Dim>(pass_x_hi - pass_x_lo), r.height()
static_cast<Coord>(r.left() + pass_x_lo), static_cast<Coord>(r.bottom() - filter_band_height),
static_cast<Dim>(pass_x_hi - pass_x_lo), filter_band_height
};
painter.fill_rectangle(
r_pass,
Color::green()
);
}
const Rect tick {
static_cast<Coord>(r.left() + x_center), r.top(),
1, r.height()
};
painter.fill_rectangle(tick, Color::white());
const Rect bottom_separator {
r.left(), static_cast<Coord>(r.bottom() - 1),
r.width(), 1
};
painter.fill_rectangle(bottom_separator, Color::white());
}
private:
uint32_t spectrum_sampling_rate { 0 };
size_t spectrum_bins { 0 };
uint32_t channel_filter_pass_frequency { 0 };
uint32_t channel_filter_stop_frequency { 0 };
};
class WaterfallView : public Widget {
@ -203,7 +242,7 @@ public:
}
void set_parent_rect(const Rect new_parent_rect) override {
constexpr Dim scale_height = 16;
constexpr Dim scale_height = 20;
View::set_parent_rect(new_parent_rect);
frequency_scale.set_parent_rect({ 0, 0, new_parent_rect.width(), scale_height });