main.cpp Example File

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  ** Contact: https://www.qt.io/licensing/
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  #include "surfacegraph.h"

  #include <QtWidgets/QApplication>
  #include <QtWidgets/QWidget>
  #include <QtWidgets/QHBoxLayout>
  #include <QtWidgets/QVBoxLayout>
  #include <QtWidgets/QGroupBox>
  #include <QtWidgets/QCheckBox>
  #include <QtWidgets/QLabel>
  #include <QtWidgets/QMessageBox>
  #include <QtGui/QScreen>
  #include <QtGui/QPainter>

  int main(int argc, char **argv)
  {
      QApplication app(argc, argv);
      Q3DSurface *graph = new Q3DSurface();
      QWidget *container = QWidget::createWindowContainer(graph);

      if (!graph->hasContext()) {
          QMessageBox msgBox;
          msgBox.setText("Couldn't initialize the OpenGL context.");
          msgBox.exec();
          return -1;
      }

      QSize screenSize = graph->screen()->size();
      container->setMinimumSize(QSize(screenSize.width() / 2, screenSize.height() / 1.6));
      container->setMaximumSize(screenSize);
      container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
      container->setFocusPolicy(Qt::StrongFocus);

      QWidget *widget = new QWidget;
      QHBoxLayout *hLayout = new QHBoxLayout(widget);
      QVBoxLayout *vLayout = new QVBoxLayout();
      hLayout->addWidget(container, 1);
      hLayout->addLayout(vLayout);
      vLayout->setAlignment(Qt::AlignTop);

      widget->setWindowTitle(QStringLiteral("Textured surface example"));

      QCheckBox *enableTexture = new QCheckBox(widget);
      enableTexture->setText(QStringLiteral("Surface texture"));

      int height = 400;
      int width = 100;
      int border = 10;
      QLinearGradient gr(0, 0, 1, height - 2 * border);
      gr.setColorAt(1.0f, Qt::black);
      gr.setColorAt(0.8f, Qt::darkGreen);
      gr.setColorAt(0.6f, Qt::green);
      gr.setColorAt(0.4f, Qt::yellow);
      gr.setColorAt(0.2f, Qt::red);
      gr.setColorAt(0.0f, Qt::darkRed);

      QPixmap pm(width, height);
      pm.fill(Qt::transparent);
      QPainter pmp(&pm);
      pmp.setBrush(QBrush(gr));
      pmp.setPen(Qt::NoPen);
      pmp.drawRect(border, border, 35, height - 2 * border);
      pmp.setPen(Qt::black);
      int step = (height - 2 * border) / 5;
      for (int i = 0; i < 6; i++) {
          int yPos = i * step + border;
          pmp.drawLine(border, yPos, 55, yPos);
          pmp.drawText(60, yPos + 2, QString("%1 m").arg(550 - (i * 110)));
      }

      QLabel *label = new QLabel(widget);
      label->setPixmap(pm);

      QGroupBox *heightMapGroupBox = new QGroupBox(QStringLiteral("Highlight color map"));
      QVBoxLayout *colorMapVBox = new QVBoxLayout;
      colorMapVBox->addWidget(label);
      heightMapGroupBox->setLayout(colorMapVBox);

      vLayout->addWidget(enableTexture);
      vLayout->addWidget(heightMapGroupBox);

      widget->show();

      SurfaceGraph *modifier = new SurfaceGraph(graph);

      QObject::connect(enableTexture, &QCheckBox::stateChanged,
                       modifier, &SurfaceGraph::toggleSurfaceTexture);

      enableTexture->setChecked(true);

      return app.exec();
  }