navigator.cxx

#include "navigator.h"
 
#include <cgv/gui/animate.h>
#include <cgv/gui/key_event.h>
#include <cgv/gui/mouse_event.h>
#include <cgv/math/ftransform.h>
#include <cgv_gl/gl/gl.h>
 
using namespace cgv::render;
 
namespace cgv {
namespace app {
 
navigator::navigator() {
    
    set_name("Navigator");
    gui_options.allow_stretch = false;
 
    view_ptr = nullptr;
    navigator_eye_pos = vec3(0.0f, 0.0f, 2.5f);
 
    check_for_click = -1;
 
    layout_size = 150;
 
    set_alignment(AO_END, AO_END);
    set_stretch(SO_NONE);
    set_margin(ivec2(0));
    overlay::set_size(ivec2(layout_size));
    
    show_box = true;
    show_wireframe = true;
    use_perspective = true;
    hit_axis = 0;
 
    box_data.style.default_extent = vec3(1.0f);
    box_data.style.map_color_to_material = CM_COLOR_AND_OPACITY;
    box_data.style.surface_color = rgb(0.5f);
 
    box_data.style.illumination_mode = IM_TWO_SIDED;
    box_data.style.culling_mode = CM_OFF;
    box_data.style.material.set_diffuse_reflectance(rgb(0.5f));
    box_data.style.material.set_emission(rgb(0.05f));
    box_data.style.surface_opacity = 0.35f;
 
    box_wire_data.style.default_color = rgb(0.5f);
    
    sphere_data.style.illumination_mode = IM_OFF;
    sphere_data.style.radius = 0.04f;
    sphere_data.style.surface_color = rgb(0.5f);
 
    arrow_data.style.illumination_mode = IM_OFF;
    arrow_data.style.radius_relative_to_length = 0.04f;
    arrow_data.style.head_length_mode = AHLM_RELATIVE_TO_LENGTH;
    arrow_data.style.head_length_relative_to_length = 0.3f;
    arrow_data.style.head_radius_scale = 2.5f;
 
    rectangle_data.style.illumination_mode = IM_OFF;
    rectangle_data.style.map_color_to_material = CM_COLOR_AND_OPACITY;
    rectangle_data.style.surface_color = rgb(0.05f, 0.25f, 1.0f);
    rectangle_data.style.surface_opacity = 0.75f;
    rectangle_data.style.pixel_blend = 0.0f;
    rectangle_data.style.percentual_border_width = 0.111111f;
    rectangle_data.style.default_border_color = rgba(0.05f, 0.15f, 0.8f, 0.75f);
}
 
void navigator::clear(context& ctx) {
 
    blit_canvas.destruct(ctx);
    fbc.destruct(ctx);
 
    arrow_data.destruct(ctx);
    box_data.destruct(ctx);
    box_wire_data.destruct(ctx);
    rectangle_data.destruct(ctx);
    sphere_data.destruct(ctx);
 
    box_renderer.clear(ctx);
}
 
bool navigator::self_reflect(cgv::reflect::reflection_handler& _rh) {
    return _rh.reflect_member("layout_size", layout_size);
}
 
bool navigator::handle_mouse_event(cgv::gui::mouse_event& e, cgv::ivec2 local_mouse_pos) {
 
    int last_hit_axis = hit_axis;
    hit_axis = 0;
 
    if(get_context()) {
        context& ctx = *get_context();
 
        if(e.get_action() == cgv::gui::MA_LEAVE) {
            hit_axis = 0;
        } else {
            vec2 window_coord = vec2(local_mouse_pos) * vec2(2.0f) / get_rectangle().size - vec2(1.0f);
            vec3 origin = vec3(window_coord, navigator_eye_pos.z());
            vec3 direction = vec3(0.0f, 0.0f, -1.0f);
 
            if(use_perspective) {
                mat4 MVP = get_projection_matrix() * get_view_matrix(ctx);
 
                vec4 world_coord(window_coord.x(), window_coord.y(), 1.0f, 1.0f);
                world_coord = inv(MVP) * world_coord;
                world_coord /= world_coord.w();
 
                vec3 origin = navigator_eye_pos;
                vec3 direction = normalize(vec3(world_coord) - origin);
            }
 
            mat4 IM = inv(get_model_matrix(ctx));
 
            origin = vec3(IM * vec4(origin, 1.0f));
            direction = vec3(IM * vec4(direction, 0.0f));
 
            float t = std::numeric_limits<float>::max();
            if(intersect_box(origin, direction, t)) {
                vec3 hit_pos = origin + t * direction;
 
                unsigned mi = cgv::math::max_index(cgv::math::abs(hit_pos));
 
                hit_axis = static_cast<int>(mi) + 1;
                if(hit_pos[mi] < 0.0f)
                    hit_axis = -hit_axis;
            }
        }
        
        if(last_hit_axis != hit_axis)
            post_redraw();
    }
 
    switch(e.get_action()) {
    case cgv::gui::MA_PRESS:
        if(e.get_button() == cgv::gui::MB_LEFT_BUTTON) {
            check_for_click = e.get_time();
            return true;
        }
        break;
    case cgv::gui::MA_RELEASE:
        if(check_for_click != -1) {
            double dt = e.get_time() - check_for_click;
            if(dt < 0.2) {
                if(hit_axis != 0) {
                    int axis_idx = abs(hit_axis) - 1;
 
                    vec3 view_dir(0.0f);
                    view_dir[axis_idx] = hit_axis < 0.0f ? -1.0f : 1.0f;
 
                    if(view_ptr) {
                        vec3 focus = view_ptr->get_focus();
                        float dist = (focus - view_ptr->get_eye()).length();
                            
                        vec3 view_up_dir(0.0f, 1.0f, 0.0f);
                        if(axis_idx == 1)
                            view_up_dir = vec3(0.0f, 0.0f, hit_axis < 0 ? 1.0f : -1.0f);
                            
                        dvec3 axis;
                        double angle;
                        view_ptr->compute_axis_and_angle(-view_dir, view_up_dir, axis, angle);
                            
                        cgv::gui::animate_with_axis_rotation(view_ptr->ref_view_dir(), axis, angle, 0.5)->set_base_ptr(this);
                        cgv::gui::animate_with_axis_rotation(view_ptr->ref_view_up_dir(), axis, angle, 0.5)->set_base_ptr(this);
 
                        post_redraw();
                        return true;
                    }
                }
            }
        }
        break;
    default:
        break;
    }
 
    return false;
}
 
void navigator::on_set(void* member_ptr) {
 
    if(member_ptr == &layout_size) {
        layout_size = cgv::math::clamp(layout_size, 10, 2000);
        overlay::set_size(ivec2(layout_size));
    }
 
    update_member(member_ptr);
    post_redraw();
}
 
bool navigator::init(context& ctx) {
    
    fbc.add_attachment("depth", "[D]");
    fbc.add_attachment("color", "flt32[R,G,B,A]", TF_LINEAR);
    fbc.set_size(get_rectangle().size);
    
    bool success = true;
 
    success &= fbc.ensure(ctx);
    
    success &= arrow_data.init(ctx);
    success &= box_data.init(ctx);
    success &= box_wire_data.init(ctx);
    success &= rectangle_data.init(ctx);
    success &= sphere_data.init(ctx);
 
    success &= box_renderer.init(ctx);
 
    blit_canvas.register_shader("rectangle", cgv::g2d::shaders::rectangle);
    success &= blit_canvas.init(ctx);
 
    if(success) {
        box_data.add_position(vec3(0.0f));
        box_wire_data.add_position(vec3(0.0f));
        
        sphere_data.add_position(vec3(0.0f));
 
        const float length = 0.5f;
 
        // x - red
        arrow_data.add(vec3(0.0f), rgb(0.85f, 0.0f, 0.0f), vec3(length, 0.0f, 0.0f));
        // y - green
        arrow_data.add(vec3(0.0f), rgb(0.0f, 0.75f, 0.0f), vec3(0.0f, length, 0.0f));
        // z - blue
        arrow_data.add(vec3(0.0f), rgb(0.0f, 0.05f, 0.95f), vec3(0.0f, 0.0f, length));
        
        blit_style.fill_color = rgba(1.0f);
        blit_style.use_texture = true;
        blit_style.use_blending = true;
        blit_style.feather_width = 0.0f;
 
        auto& blit_prog = blit_canvas.enable_shader(ctx, "rectangle");
        blit_style.apply(ctx, blit_prog);
        blit_canvas.disable_current_shader(ctx);
    }
 
    return success;
}
 
void navigator::init_frame(context& ctx) {
 
    if(!view_ptr)
        view_ptr = find_view_as_node();
 
    if(ensure_layout(ctx)) {
        fbc.set_size(get_rectangle().size);
        fbc.ensure(ctx);
 
        blit_canvas.set_resolution(ctx, get_viewport_size());
    }
}
 
void navigator::finish_draw(context& ctx) {
 
    fbc.enable(ctx);
 
    ctx.push_bg_color();
    ctx.set_bg_color({ 0.0f });
    ctx.clear_background(true, true);
    ctx.pop_bg_color();
 
    ctx.push_projection_matrix();
    ctx.set_projection_matrix(get_projection_matrix());
 
    ctx.push_modelview_matrix();
    ctx.set_modelview_matrix(get_view_matrix(ctx) * get_model_matrix(ctx));
 
    ctx.push_depth_test_state();
    ctx.disable_depth_test();
 
    ctx.push_blend_state();
    ctx.enable_blending();
    ctx.set_blend_func_separate(BF_SRC_ALPHA, BF_ONE_MINUS_SRC_ALPHA, BF_ONE, BF_ONE_MINUS_SRC_ALPHA);
    
    if(show_box)
        box_data.render(ctx, box_renderer);
 
    if(show_wireframe)
        box_wire_data.render(ctx);
 
    sphere_data.render(ctx);
    arrow_data.render(ctx);
 
    if(hit_axis != 0) {
        int axis_idx = abs(hit_axis) - 1;
        vec3 position(0.0f);
        position[axis_idx] = hit_axis < 0.0f ? -0.5f : 0.5f;
 
        const int mapping[3] = {1, 0, 2};
 
        vec3 rotation_axis(0.0f);
        rotation_axis[mapping[axis_idx]] = hit_axis < 0.0f ? -1.0f : 1.0f;
 
        std::vector<quat> rotations;
        quat rotation(rotation_axis, cgv::math::deg2rad(90.0f));
 
        rectangle_data.clear();
        rectangle_data.add_position(position);
        rectangle_data.add_rotation(rotation);
 
        rectangle_data.const_extent = vec2(0.9f);
        rectangle_data.render(ctx);
    }
 
    ctx.pop_modelview_matrix();
    ctx.pop_projection_matrix();
 
    fbc.disable(ctx);
 
    ctx.set_blend_func(BF_SRC_ALPHA, BF_ONE_MINUS_SRC_ALPHA);
 
    // draw frame buffer texture to screen
    auto& blit_prog = blit_canvas.enable_shader(ctx, "rectangle");
 
    fbc.enable_attachment(ctx, "color", 0);
    blit_canvas.draw_shape(ctx, get_rectangle());
    fbc.disable_attachment(ctx, "color");
 
    blit_canvas.disable_current_shader(ctx);
 
    ctx.pop_blend_state();
    ctx.pop_depth_test_state();
}
 
void navigator::set_size(int size) {
 
    layout_size = size;
    on_set(&layout_size);
}
 
void navigator::create_gui_impl() {
 
    add_member_control(this, "Size", layout_size, "value_slider", "min=50;max=300;step=1;ticks=true");
    add_member_control(this, "Show Box", show_box, "check");
    add_member_control(this, "Show Wireframe", show_wireframe, "check");
    add_member_control(this, "Use Perspective", use_perspective, "check");
}
 
mat4 navigator::get_model_matrix(context& ctx) {
 
    mat4 MV = ctx.get_modelview_matrix();
 
    // remove translation
    MV(0, 3) = 0.0f;
    MV(1, 3) = 0.0f;
    MV(2, 3) = 0.0f;
 
    return MV;
}
 
mat4 navigator::get_view_matrix(context& ctx) {
 
    return cgv::math::look_at4(navigator_eye_pos, vec3(0.0f), vec3(0.0f, 1.0f, 0.0f));
}
 
mat4 navigator::get_projection_matrix() {
 
    vec2 size = static_cast<vec2>(get_rectangle().size);
    float aspect = size.x() / size.y();
    
    if(use_perspective)
        return cgv::math::perspective4(45.0f, aspect, 0.1f, 10.0f);
    else
        return cgv::math::ortho4(-1.0f, 1.0f, -1.0f, 1.0f, 0.01f, 5.0f);
}
 
bool navigator::intersect_box(const vec3 &origin, const vec3& direction, float& t) const {
 
    vec3 min(-0.5f);
    vec3 max(+0.5f);
 
    float t_min, t_max;
 
    vec3 inv_dir = vec3(1.0f) / direction;
 
    float t1 = (min.x() - origin.x())*inv_dir.x();
    float t2 = (max.x() - origin.x())*inv_dir.x();
 
    t_min = std::min(t1, t2);
    t_max = std::max(t1, t2);
 
    t1 = (min.y() - origin.y())*inv_dir.y();
    t2 = (max.y() - origin.y())*inv_dir.y();
 
    t_min = std::max(t_min, std::min(t1, t2));
    t_max = std::min(t_max, std::max(t1, t2));
 
    t1 = (min.z() - origin.z())*inv_dir.z();
    t2 = (max.z() - origin.z())*inv_dir.z();
 
    t_min = std::max(t_min, std::min(t1, t2));
    t_max = std::min(t_max, std::max(t1, t2));
 
    t = t_min;
    return t_max > std::max(t_min, 0.0f);
}
 
}
}