3D Text: created 3d text geometry and mesh

- Allows to extrude a 3D mesh from a text string
- Added 3d-text example

Triangulation fixes provided by Remi Faitout

Task-number: QTBUG-19234
Change-Id: I767ffa11092d30945e3fc19f90f72a5965f5a776
Reviewed-by: Paul Lemire <paul.lemire@kdab.com>

1 files changed, 124 insertions, 0 deletions

diff --git a/examples/qt3d/3d-text/main.cpp b/examples/qt3d/3d-text/main.cpp
new file mode 100644
index 000000000..40ae8b80a
--- /dev/null
+++ b/examples/qt3d/3d-text/main.cpp
@@ -0,0 +1,124 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 Klaralvdalens Datakonsult AB (KDAB).
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the Qt3D module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QCoreApplication>
+#include <Qt3DCore/Qt3DCore>
+#include <Qt3DExtras/Qt3DExtras>
+#include <qtext3dmesh.h>
+#include <qtext3dgeometry.h>
+
+int main(int argc, char *argv[])
+{
+    QGuiApplication a(argc, argv);
+    Qt3DExtras::Qt3DWindow *view = new Qt3DExtras::Qt3DWindow();
+    view->setTitle(QStringLiteral("3D Text CPP"));
+    view->defaultFrameGraph()->setClearColor(QColor(210, 210, 220));
+
+    auto *root = new Qt3DCore::QEntity();
+
+    { // plane
+        auto *plane = new Qt3DCore::QEntity(root);
+        auto *planeMesh = new Qt3DExtras::QPlaneMesh();
+        auto *planeTransform = new Qt3DCore::QTransform();
+        auto *planeMaterial = new Qt3DExtras::QPhongMaterial(root);
+        planeMesh->setWidth(10); planeMesh->setHeight(10);
+        planeTransform->setTranslation(QVector3D(0, 0, 0));
+        planeMaterial->setDiffuse(QColor(150, 150, 150));
+
+        plane->addComponent(planeMaterial);
+        plane->addComponent(planeMesh);
+        plane->addComponent(planeTransform);
+    }
+
+    auto *textMaterial = new Qt3DExtras::QPhongMaterial(root);
+    { // text
+        int i = 0;
+        QStringList fonts = QFontDatabase().families();
+
+        for (QString family : fonts)
+        {
+            auto *text = new Qt3DCore::QEntity(root);
+            auto *textMesh = new Qt3DExtras::QText3DMesh();
+            Qt3DExtras::QText3DGeometry *textGeometry = static_cast<Qt3DExtras::QText3DGeometry*>(textMesh->geometry());
+
+            auto *textTransform = new Qt3DCore::QTransform();
+            QFont font(family, 32, -1, false);
+            textTransform->setTranslation(QVector3D(-2.45f, i * .5f, 0));
+            textTransform->setScale(.2f);
+            textGeometry->setDepth(.45f);
+            textGeometry->setFont(font);
+            textGeometry->setEdgeSplitAngle(90.f * .15f);
+            textGeometry->setText(QString(family));
+            textMaterial->setDiffuse(QColor(111, 150, 255));
+
+            text->addComponent(textMaterial);
+            text->addComponent(textMesh);
+            text->addComponent(textTransform);
+
+            i++;
+        }
+    }
+
+    { // camera
+        float aspect = static_cast<float>(view->screen()->size().width()) / view->screen()->size().height();
+        Qt3DRender::QCamera *camera = view->camera();
+        camera->lens()->setPerspectiveProjection(65.f, aspect, 0.1f, 100.f);
+        camera->setPosition(QVector3D(0, 5, 3));
+        camera->setViewCenter(QVector3D(0, 5, 0));
+
+        auto *cameraController = new Qt3DExtras::QOrbitCameraController(root);
+        cameraController->setCamera(camera);
+    }
+
+    view->setRootEntity(root);
+    view->show();
+
+    return a.exec();
+}