scene3d.cpp

#include "scene3d.h"
#include <cmath>
#include <QPainter>

Scene3D::Scene3D(QWidget *parent) : Scene (parent)
{
}

void Scene3D::addCube(int x, int y, int z, int width, int height, int length)
{
    Cube *cube = new Cube(x, y, z, width, height, length, this);
    addItem(cube);
}

void Scene3D::addSphere(int x, int y, int z, int r)
{
    Sphere *sphere = new Sphere(x, y, z, r, this);
    addItem(sphere);
}

void Scene3D::addCylinder(int cx, int cy, int cz, int r, int h)
{
    Cylinder *cylinder = new Cylinder(cx, cy, cz, r, h, this);
    addItem(cylinder);
}

void Scene3D::setMethod(bool method)
{
    if (method) {
        projection = CAVALIER;
        to2D = Drawer::cavalier;
    } else {
        projection = CABINET;
        to2D = Drawer::cabinet;
    }
    update();
}

void Scene3D::drawBackground(QPainter *painter, const QRectF &rect)
{
    Q_UNUSED(rect);
    int halfHeight = static_cast<int>(this->height()) / 2;
    int halfWidth = static_cast<int>(this->width()) / 2;
    const int halfThick = thickness / 2; //make it center

    // Draw ox and oy
    painter->setPen(QPen(QBrush(Qt::black), 1));
    painter->setOpacity(0.6);

    const int square = std::min(halfHeight, halfWidth) + halfThick * 2;
    const QPen pen = painter->pen();
    painter->setPen(QPen(Qt::DashLine));

    painter->drawLine(0, halfHeight + halfThick, halfWidth, halfHeight + halfThick);

    painter->drawLine(halfWidth + halfThick, halfHeight + halfThick, halfWidth + halfThick, static_cast<int>(this->height()));
    painter->drawLine(halfWidth + square , 0, halfWidth + halfThick, halfHeight + halfThick);

    painter->setPen(pen);

    painter->drawLine(halfWidth, halfHeight + halfThick, static_cast<int>(this->width()), halfHeight + halfThick);

    painter->drawLine(halfWidth + halfThick, 0, halfWidth + halfThick,  halfHeight + halfThick);

    painter->drawLine(halfWidth + halfThick,  halfHeight + halfThick, square, static_cast<int>(this->height()));

//    const int space = thickness * 5; //line spacing
//    painter->setOpacity(0.25);

//    // Draw vertical line
//    for(int xJump = halfThick; xJump < this->width(); xJump += space){
//        painter->drawLine(xJump, 0, xJump, static_cast<int>(this->height()));
//    }

//    // Draw horizontal line
//    for(int yJump = halfThick; yJump < this->height(); yJump += space){
//        painter->drawLine(0, yJump, static_cast<int>(this->width()), yJump);
//    }

//    // Draw grid
//    painter->setOpacity(0.08);
//    for(int xJump = halfThick; xJump < this->width(); xJump += thickness){
//        painter->drawLine(xJump, 0, xJump, static_cast<int>(this->height()));
//    }
//    for(int yJump = halfThick; yJump < this->height(); yJump += thickness){
//        painter->drawLine(0, yJump, static_cast<int>(this->width()), yJump);
//    }

    //Draw ruler
    painter->setOpacity(0.8);
    painter->setFont(QFont("Segoe UI", 8));
    int jump = 10 * thickness;

    for(int xJump = halfThick + jump, y = halfHeight + halfThick + 10, x = -offx + 10;
         xJump < this->width(); xJump += jump, x += 10){
        painter->drawText(xJump - 10, y, QString::number(x));
    }
    for(int yJump = halfThick + jump, y = offy - 10, x = halfWidth + halfThick - 15;
         yJump < this->height(); yJump += jump, y -= 10){
        if (y == 0) continue;
        painter->drawText(x, yJump + 5, QString::number(y));
    }
    jump = static_cast<int>(std::round(jump * projection));
    for(int x = halfWidth + jump, y = halfHeight - jump, val = -10; x < this->width() && y > 0;
         x += jump, y -= jump, val -= 10){
        painter->drawText(x + 5, y + 5, QString::number(val));
    }
    for(int x = halfWidth - jump, y = halfHeight + jump, val = 10; x > 0 && y < this->height();
         x -= jump, y += jump, val += 10){
        painter->drawText(x + 5, y + 8, QString::number(val));
    }

    painter->setOpacity(1.0);
    // Draw x, y
    painter->setFont(QFont("Segoe UI", 10));
    painter->drawText(halfWidth - 10, 10, QString("z"));
    painter->drawText(static_cast<int>(this->width()) - 10, halfHeight + 15, QString("x"));
    painter->drawText(square + 15, static_cast<int>(this->height()) - 5, QString("y"));

    // Draw arrow
    halfWidth += halfThick;
    halfHeight += halfThick;
    painter->drawLine(static_cast<int>(this->width()) - 5, halfHeight - 5, static_cast<int>(this->width()), halfHeight);
    painter->drawLine(static_cast<int>(this->width()) - 5, halfHeight + 5, static_cast<int>(this->width()), halfHeight);
    painter->drawLine(halfWidth - 5, 5, halfWidth, 0);
    painter->drawLine(halfWidth + 5, 5, halfWidth, 0);
    painter->drawLine(square, static_cast<int>(this->height()) - 7, square, static_cast<int>(this->height()));
    painter->drawLine(square, static_cast<int>(this->height()) - 1, square + 7, static_cast<int>(this->height()) - 1);
}

void Scene3D::setThickness(int value)
{
    Scene::setThickness(value);
    update();
}