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diff --git a/tests/manual/triangulator/triviswidget.h b/tests/manual/triangulator/triviswidget.h
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+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the test suite of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:GPL-EXCEPT$
+** 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.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef TRIVISWIDGET_H
+#define TRIVISWIDGET_H
+
+#include <QWidget>
+#include <QComboBox>
+#include <QRadioButton>
+#include <QLabel>
+#include <QSpinBox>
+#include <QCheckBox>
+#include <QScrollArea>
+
+class TriVisCanvas : public QWidget
+{
+    Q_OBJECT
+
+public:
+    TriVisCanvas(QWidget *parent = nullptr);
+
+    QStringList shapes() const;
+
+    enum Type {
+        Stroke,
+        Fill
+    };
+
+    void setType(Type t) { m_type = t; }
+    void setIndex(int idx) { m_idx = idx; }
+
+    void setStrokeWidth(float w) { m_strokeWidth = w; }
+    void setDashStroke(bool d) { m_dashStroke = d; }
+
+    void setStepLimits(int strokeLimit, int fillLimit) {
+        m_strokeStepLimit = strokeLimit;
+        m_fillStepLimit = fillLimit;
+        update();
+    }
+
+    enum GeomType {
+        Triangles,
+        TriangleStrips
+    };
+
+    QImage preview() const;
+    GeomType geomType() const { return m_type == Stroke ? TriangleStrips : Triangles; }
+    int vertexCount() const { return m_type == Stroke ? m_strokeVertices.count() : m_fillVertices.count(); }
+    int indexCount() const { return m_type == Stroke ? 0 : m_fillIndices.count(); }
+    float zoomLevel() const { return m_zoom; }
+
+    void retriangulate();
+    void regeneratePreviews();
+
+protected:
+    void paintEvent(QPaintEvent *event) override;
+    void wheelEvent(QWheelEvent *event) override;
+
+signals:
+    void retriangulated();
+    void zoomChanged(float oldZoom, float newZoom);
+
+private:
+    void addPreview(int idx);
+
+    Type m_type = Stroke;
+    int m_idx = 0;
+    float m_strokeWidth = 1;
+    bool m_dashStroke = false;
+
+    QVector<QPainterPath> m_paths;
+    QVector<QImage> m_strokePreviews;
+    QVector<QImage> m_fillPreviews;
+
+    struct Vertex {
+        float x, y;
+        void set(float vx, float vy) { x = vx; y = vy; }
+    };
+    QVector<Vertex> m_fillVertices;
+    QVector<quint32> m_fillIndices;
+    QVector<Vertex> m_strokeVertices;
+
+    float m_zoom = 1;
+
+    int m_fillStepLimit = 0;
+    int m_strokeStepLimit = 0;
+};
+
+class TriangulationVisualizer : public QWidget
+{
+    Q_OBJECT
+
+public:
+    TriangulationVisualizer(QWidget *parent = nullptr);
+
+private:
+    void updateInfoLabel();
+    void updatePreviewLabel();
+
+    QComboBox *m_cbShape;
+    QLabel *m_lbPreview;
+    QRadioButton *m_rdStroke;
+    QRadioButton *m_rdFill;
+    QScrollArea *m_scrollArea;
+    TriVisCanvas *m_canvas;
+    QLabel *m_lbInfo;
+    QSpinBox *m_spStrokeWidth;
+    QCheckBox *m_chDash;
+    QCheckBox *m_chStepEnable;
+    QSpinBox *m_spStepStroke;
+    QSpinBox *m_spStepFill;
+};
+
+#endif