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Color the vectorscope lines

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This commit is contained in:
Lawrence Lee
2020-08-27 16:35:39 -07:00
parent 6c2463889b
commit 6d8a31961f
1 changed files with 33 additions and 3 deletions
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36
rtgui/histogrampanel.cc
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@@ -1378,19 +1378,34 @@ void HistogramArea::drawVectorscope(Cairo::RefPtr<Cairo::Context> &cr, int w, in
std::valarray<double> ch_ds(1);
cr->translate(w / 2.0, h / 2.0);
cr->set_source_rgba (1., 1., 1., 0.25);
cr->set_line_width (1.0 * s);
cr->set_antialias(Cairo::ANTIALIAS_SUBPIXEL);
ch_ds[0] = 4;
if (scopeType == 2) { // Hue-Saturation.
// RYGCBM lines.
cr->set_line_width (2.0 * s);
constexpr double color_labels[6][3] = {
{1, 0, 0}, // R
{1, 1, 0}, // Y
{0, 1, 0}, // G
{0, 1, 1}, // C
{0, 0, 1}, // B
{1, 0, 1}, // M
};
for (int i = 0; i < 6; i++) {
auto gradient = Cairo::LinearGradient::create(0, 0, scope_size / 2.0, 0);
const double (&color)[3] = color_labels[i];
cr->set_source(gradient);
gradient->add_color_stop_rgba(0, 1, 1, 1, 0.25);
gradient->add_color_stop_rgba(1, color[0], color[1], color[2], 0.5);
cr->move_to(line_spacing, 0);
cr->line_to(line_spacing + line_length, 0);
cr->rotate_degrees(60);
cr->rotate_degrees(-60);
cr->stroke();
}
cr->stroke();
cr->set_line_width (1.0 * s);
cr->set_source_rgba (1, 1, 1, 0.25);
// 100% saturation circle.
cr->arc(0, 0, scope_size / 2.0, 0, 2 * RT_PI);
cr->stroke();
@@ -1408,15 +1423,30 @@ void HistogramArea::drawVectorscope(Cairo::RefPtr<Cairo::Context> &cr, int w, in
cr->unset_dash();
} else if (scopeType == 3) { // Hue-Chroma.
// a and b axes.
Cairo::RefPtr<Cairo::LinearGradient> gradient;
cr->set_line_width (2.0 * s);
gradient = Cairo::LinearGradient::create(0, -scope_size / 2.0, 0, scope_size / 2.0);
cr->set_source(gradient);
gradient->add_color_stop_rgba(0, 1, 1, 0, 0.5); // "yellow"
gradient->add_color_stop_rgba(0.5, 1, 1, 1, 0.25); // neutral
gradient->add_color_stop_rgba(1, 0, 0, 1, 0.5); // "blue"
cr->move_to(0, line_spacing);
cr->line_to(0, line_spacing + line_length);
cr->move_to(0, -line_spacing);
cr->line_to(0, -line_spacing - line_length);
cr->stroke();
gradient = Cairo::LinearGradient::create(-scope_size / 2.0, 0, scope_size / 2.0, 0);
cr->set_source(gradient);
gradient->add_color_stop_rgba(0, 0, 1, 0, 0.5); // "green"
gradient->add_color_stop_rgba(0.5, 1, 1, 1, 0.25); // neutral
gradient->add_color_stop_rgba(1, 1, 0, 1, 0.5); // "magenta"
cr->move_to(line_spacing, 0);
cr->line_to(line_spacing + line_length, 0);
cr->move_to(-line_spacing, 0);
cr->line_to(-line_spacing - line_length, 0);
cr->stroke();
cr->set_source_rgba (1, 1, 1, 0.25);
cr->set_line_width (1.0 * s);
// 25%, 50%, 75%, and 100% of standard chroma range.
cr->set_dash(ch_ds, 0);
for (int i = 1; i <= 4; i++) {