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showing hue, red, green, and blue values

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This commit is contained in:
Bob Polis 2020-10-31 00:42:32 +01:00
parent a683985756
commit 7ca1510020
1 changed files with 16 additions and 5 deletions
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21
huey/Huey.cpp
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@ -9,6 +9,8 @@
#include "Huey.hpp"
#include <libscscreensaver.hpp>
#include <string>
#include <sstream>
#include <iomanip>
class Huey : public ScreensaverPlugin {
public:
@ -47,18 +49,27 @@ void Huey::draw_frame() {
cairo_fill(_c);
// show hue value
std::string hue_text {std::to_string(static_cast<int>(_hue))};
std::ostringstream hue_oss;
hue_oss << "hue: " << std::setw(5) << std::setprecision(4) << _hue;
std::ostringstream rgb_oss;
rgb_oss << "red: " << std::setw(3) << static_cast<int>(255 * rgb.r);
rgb_oss << ", green: " << std::setw(3) << static_cast<int>(255 * rgb.g);
rgb_oss << ", blue: " << std::setw(3) << static_cast<int>(255 * rgb.b);
cairo_set_source_rgb(_c, 0, 0, 0);
cairo_select_font_face(_c, "Helvetica", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL);
cairo_set_font_size(_c, 24);
cairo_move_to(_c, 30, 50);
cairo_show_text(_c, hue_text.c_str());
cairo_move_to(_c, 31, 51);
cairo_show_text(_c, hue_oss.str().c_str());
cairo_move_to(_c, 31, 87);
cairo_show_text(_c, rgb_oss.str().c_str());
cairo_set_source_rgb(_c, 1, 1, 1);
cairo_move_to(_c, 29, 49);
cairo_show_text(_c, hue_text.c_str());
cairo_show_text(_c, hue_oss.str().c_str());
cairo_move_to(_c, 29, 85);
cairo_show_text(_c, rgb_oss.str().c_str());
// update for next frame
_hue += 0.5;
_hue += 0.1;
if (_hue >= 360.0) {
_hue -= 360.0;
}