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Code Issues Activity Actions

PixelPaint: Add a histogram widget

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This adds a simple histogram widget that visualizes the rgb-channels
and brightness for a given image. When hovering over the image it will
indicate what brightness level the pixel at the mouse position has.
This commit is contained in:
Torstennator 2022-04-18 15:24:49 +02:00 • committed by Linus Groh
parent 5702f016f0
commit b7e8f32323
6 changed files with 241 additions and 0 deletions
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8
Userland/Applications/PixelPaint/MainWidget.cpp
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@ -46,6 +46,7 @@ MainWidget::MainWidget()
m_palette_widget = *find_descendant_of_type_named<PixelPaint::PaletteWidget>("palette_widget");
m_histogram_widget = *find_descendant_of_type_named<PixelPaint::HistogramWidget>("histogram_widget");
m_layer_list_widget = *find_descendant_of_type_named<PixelPaint::LayerListWidget>("layer_list_widget");
m_layer_list_widget->on_layer_select = [&](auto* layer) {
auto* editor = current_image_editor();
@ -73,6 +74,7 @@ MainWidget::MainWidget()
m_tab_widget->deferred_invoke([&] {
m_tab_widget->remove_tab(image_editor);
if (m_tab_widget->children().size() == 0) {
m_histogram_widget->set_image(nullptr);
m_layer_list_widget->set_image(nullptr);
m_layer_properties_widget->set_layer(nullptr);
m_palette_widget->set_image_editor(nullptr);
@ -86,11 +88,13 @@ MainWidget::MainWidget()
m_tab_widget->on_change = [&](auto& widget) {
auto& image_editor = verify_cast<PixelPaint::ImageEditor>(widget);
m_palette_widget->set_image_editor(&image_editor);
m_histogram_widget->set_image(&image_editor.image());
m_layer_list_widget->set_image(&image_editor.image());
m_layer_properties_widget->set_layer(image_editor.active_layer());
window()->set_modified(image_editor.is_modified());
image_editor.on_modified_change = [this](bool modified) {
window()->set_modified(modified);
m_histogram_widget->image_changed();
};
if (auto* active_tool = m_toolbox->active_tool())
image_editor.set_active_tool(active_tool);
@ -125,6 +129,7 @@ void MainWidget::initialize_menubar(GUI::Window& window)
editor.set_title(image_title.is_empty() ? "Untitled" : image_title);
editor.undo_stack().set_current_unmodified();
m_histogram_widget->set_image(image);
m_layer_list_widget->set_image(image);
m_layer_list_widget->set_selected_layer(bg_layer);
}
@ -853,13 +858,16 @@ ImageEditor& MainWidget::create_new_editor(NonnullRefPtr<Image> image)
auto image_rectangle = Gfx::IntRect { 0, 0, image_size.width(), image_size.height() };
if (image_rectangle.contains(mouse_position)) {
m_statusbar->set_override_text(mouse_position.to_string());
m_histogram_widget->set_color_at_mouseposition(current_image_editor()->image().color_at(mouse_position));
} else {
m_statusbar->set_override_text({});
m_histogram_widget->set_color_at_mouseposition(Color::Transparent);
}
};
image_editor.on_leave = [&]() {
m_statusbar->set_override_text({});
m_histogram_widget->set_color_at_mouseposition(Color::Transparent);
};
image_editor.on_set_guide_visibility = [&](bool show_guides) {