infinipaint/src/DrawingProgram/DrawingProgramSelection.cpp

#include "DrawingProgramSelection.hpp"
#include "DrawingProgram.hpp"
#include "../World.hpp"
#include "../MainProgram.hpp"
#include <Helpers/MathExtras.hpp>
#include <Helpers/SCollision.hpp>
#include <Helpers/Parallel.hpp>

DrawingProgramSelection::DrawingProgramSelection(DrawingProgram& initDrawP):
    cache(initDrawP),
    drawP(initDrawP)
{}

void DrawingProgramSelection::add_from_cam_coord_collider_to_selection(const SCollision::ColliderCollection<float>& cC) {
    auto cCWorld = drawP.world.drawData.cam.c.collider_to_world<SCollision::ColliderCollection<WorldScalar>, SCollision::ColliderCollection<float>>(cC);

    drawP.compCache.disableRefresh = true;

    std::unordered_set<CollabListType::ObjectInfoPtr> selectedComponents;

    std::function<void(const std::shared_ptr<DrawingProgramCacheBVHNode>&)> fullyCollidedFunc = [&](const std::shared_ptr<DrawingProgramCacheBVHNode>& bvhNode) {
        if(bvhNode) {
            for(auto& c : bvhNode->components)
                selectedComponents.emplace(c);
            for(auto& p : bvhNode->children)
                fullyCollidedFunc(p);
        }
    };
    drawP.compCache.traverse_bvh_erase_function(cCWorld.bounds, [&](const auto& bvhNode, auto& comps) {
        if(bvhNode &&
           SCollision::collide(cC, drawP.world.drawData.cam.c.to_space(bvhNode->bounds.min)) &&
           SCollision::collide(cC, drawP.world.drawData.cam.c.to_space(bvhNode->bounds.max)) &&
           SCollision::collide(cC, drawP.world.drawData.cam.c.to_space(bvhNode->bounds.top_right())) &&
           SCollision::collide(cC, drawP.world.drawData.cam.c.to_space(bvhNode->bounds.bottom_left()))) {
            fullyCollidedFunc(bvhNode);
            drawP.compCache.invalidate_cache_at_aabb_before_pos(bvhNode->bounds, 0);
            return true;
        }
        std::erase_if(comps, [&](auto& c) {
            if(c->obj->collides_with(drawP.world.drawData.cam.c, cCWorld, cC, drawP.colliderAllocated)) {
                selectedComponents.emplace(c);
                drawP.compCache.invalidate_cache_at_aabb_before_pos(c->obj->worldAABB.value(), c->obj->collabListInfo.lock()->pos);
                return true;
            }
            return false;
        });
        return false;
    });

    selectedSet = selectedComponents;
    for(auto& obj : selectedSet)
        cache.add_component(obj);
    calculate_aabb();
}

bool DrawingProgramSelection::is_something_selected() {
    return !selectedSet.empty();
}

void DrawingProgramSelection::calculate_aabb() {
    if(is_something_selected()) {
        initialSelectionAABB = (*selectedSet.begin())->obj->worldAABB.value();
        for(auto& c : selectedSet)
            initialSelectionAABB.include_aabb_in_bounds(c->obj->worldAABB.value());
    }
}

void DrawingProgramSelection::deselect_all() {
    if(is_something_selected()) {
        std::vector<CollabListType::ObjectInfoPtr> a(selectedSet.begin(), selectedSet.end());
        parallel_loop_container(a, [&](auto& obj) {
            obj->obj->coords = selectionTransformCoords.other_coord_space_from_this_space(obj->obj->coords);
            obj->obj->final_update(drawP, false);
        });
        selectedSet.clear();
        cache.clear();
        selectionTransformCoords = CoordSpaceHelper();
        drawP.compCache.force_rebuild(drawP.components.client_list());
    }
}

void DrawingProgramSelection::update() {
    if(is_something_selected()) {
        if(cache.get_unsorted_component_list().size() >= 1000 && (std::chrono::steady_clock::now() - cache.get_last_bvh_build_time()) >= std::chrono::seconds(5))
            cache.force_rebuild(std::vector<CollabListType::ObjectInfoPtr>(selectedSet.begin(), selectedSet.end()));
        if(drawP.world.main.input.key(InputManager::KEY_DRAW_UNSELECT).pressed)
            deselect_all();
        if(drawP.world.main.input.key(InputManager::KEY_TEXT_CTRL).held)
            selectionTransformCoords.scale_about_double(selectionTransformCoords.pos, 1.01);
        if(drawP.world.main.input.key(InputManager::KEY_TEXT_SHIFT).held)
            selectionTransformCoords.scale_about_double(selectionTransformCoords.pos, 0.99);

        selectionRectMin = selectionTransformCoords.from_space_world(initialSelectionAABB.min);
        selectionRectMax = selectionTransformCoords.from_space_world(initialSelectionAABB.max);

        rebuild_cam_space();
        if(drawP.controls.leftClick && mouse_collided_with_selection_aabb())
            translation.happening = true;
        else if(drawP.controls.leftClickHeld && translation.happening)
            selectionTransformCoords.translate(drawP.world.drawData.cam.c.dir_from_space(drawP.world.main.input.mouse.move));
        else
            translation.happening = false;
    }
}

void DrawingProgramSelection::rebuild_cam_space() {
    std::array<WorldVec, 4> collideRectTriangleVerticesWorld = triangle_from_rect_points(selectionRectMin, selectionRectMax);
    SCollision::ColliderCollection<WorldScalar> collideRectWorld;
    collideRectWorld.triangle.emplace_back(collideRectTriangleVerticesWorld[0], collideRectTriangleVerticesWorld[1], collideRectTriangleVerticesWorld[2]);
    collideRectWorld.triangle.emplace_back(collideRectTriangleVerticesWorld[0], collideRectTriangleVerticesWorld[2], collideRectTriangleVerticesWorld[3]);
    collideRectWorld.recalculate_bounds();

    camSpaceSelection = drawP.world.drawData.cam.c.world_collider_to_coords<SCollision::ColliderCollection<float>>(collideRectWorld);
}

bool DrawingProgramSelection::mouse_collided_with_selection_aabb() {
    return SCollision::collide(camSpaceSelection, drawP.world.main.input.mouse.pos);
}

void DrawingProgramSelection::draw_components(SkCanvas* canvas, const DrawData& drawData) {
    if(is_something_selected()) {
        DrawData selectionDrawData = drawData;
        selectionDrawData.cam.c = selectionTransformCoords.other_coord_space_to_this_space(selectionDrawData.cam.c);
        selectionDrawData.cam.set_viewing_area(drawP.world.main.window.size.cast<float>());
        selectionDrawData.refresh_draw_optimizing_values();

        cache.refresh_all_draw_cache(selectionDrawData);
        cache.draw_components_to_canvas(canvas, selectionDrawData);
    }
}

void DrawingProgramSelection::draw_gui(SkCanvas* canvas, const DrawData& drawData) {
    if(is_something_selected() && !camSpaceSelection.triangle.empty()) {
        canvas->save();
        SkPath selectionRectPath;
        selectionRectPath.moveTo(convert_vec2<SkPoint>(camSpaceSelection.triangle[0].p[0]));
        selectionRectPath.lineTo(convert_vec2<SkPoint>(camSpaceSelection.triangle[0].p[1]));
        selectionRectPath.lineTo(convert_vec2<SkPoint>(camSpaceSelection.triangle[0].p[2]));
        selectionRectPath.lineTo(convert_vec2<SkPoint>(camSpaceSelection.triangle[1].p[2]));
        selectionRectPath.close();
        SkPaint p{SkColor4f{0.3f, 0.6f, 0.9f, 0.4f}};
        canvas->drawPath(selectionRectPath, p);
        canvas->restore();
    }
}