Qt 5.7 | Qt Data Visualization | Textured Surface Example | main.cpp Example File

Qt 5.7.1 Reference Documentation

# main.cpp Example File

texturesurface/main.cpp

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      ** Contact: https://www.qt.io/licensing/
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      ** This file is part of the Qt Data Visualization module of the Qt Toolkit.
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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();
      }