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** Copyright (C) 2016 The Qt Company Ltd.
** 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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** the Free Software Foundation and appearing in the file LICENSE.GPL3
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#include "surfacegraph.h"

#include <QtDataVisualization/QValue3DAxis>
#include <QtDataVisualization/Q3DTheme>
#include <QtGui/QImage>
#include <QtCore/qmath.h>

using namespace QtDataVisualization;

const int sampleCountX = 50;
const int sampleCountZ = 50;
const int heightMapGridStepX = 6;
const int heightMapGridStepZ = 6;
const float sampleMin = -8.0f;
const float sampleMax = 8.0f;

SurfaceGraph::SurfaceGraph(Q3DSurface *surface)
    : m_graph(surface)
{
    m_graph->setAxisX(new QValue3DAxis);
    m_graph->setAxisY(new QValue3DAxis);
    m_graph->setAxisZ(new QValue3DAxis);

    m_sqrtSinProxy = new QSurfaceDataProxy();
    m_sqrtSinSeries = new QSurface3DSeries(m_sqrtSinProxy);
    fillSqrtSinProxy();

    QImage heightMapImage(":/maps/mountain");
    m_heightMapProxy = new QHeightMapSurfaceDataProxy(heightMapImage);
    m_heightMapSeries = new QSurface3DSeries(m_heightMapProxy);
    m_heightMapSeries->setItemLabelFormat(QStringLiteral("(@xLabel, @zLabel): @yLabel"));
    m_heightMapProxy->setValueRanges(34.0f, 40.0f, 18.0f, 24.0f);
    m_heightMapWidth = heightMapImage.width();
    m_heightMapHeight = heightMapImage.height();
}

SurfaceGraph::~SurfaceGraph()
{
    delete m_graph;
}

void SurfaceGraph::fillSqrtSinProxy()
{
    float stepX = (sampleMax - sampleMin) / float(sampleCountX - 1);
    float stepZ = (sampleMax - sampleMin) / float(sampleCountZ - 1);

    QSurfaceDataArray *dataArray = new QSurfaceDataArray;
    dataArray->reserve(sampleCountZ);
    for (int i = 0 ; i < sampleCountZ ; i++) {
        QSurfaceDataRow *newRow = new QSurfaceDataRow(sampleCountX);
        // Keep values within range bounds, since just adding step can cause minor drift due
        // to the rounding errors.
        float z = qMin(sampleMax, (i * stepZ + sampleMin));
        int index = 0;
        for (int j = 0; j < sampleCountX; j++) {
            float x = qMin(sampleMax, (j * stepX + sampleMin));
            float R = qSqrt(z * z + x * x) + 0.01f;
            float y = (qSin(R) / R + 0.24f) * 1.61f;
            (*newRow)[index++].setPosition(QVector3D(x, y, z));
        }
        *dataArray << newRow;
    }

    m_sqrtSinProxy->resetArray(dataArray);
}

void SurfaceGraph::enableSqrtSinModel(bool enable)
{
    if (enable) {
        m_sqrtSinSeries->setDrawMode(QSurface3DSeries::DrawSurfaceAndWireframe);
        m_sqrtSinSeries->setFlatShadingEnabled(true);

        m_graph->axisX()->setLabelFormat("%.2f");
        m_graph->axisZ()->setLabelFormat("%.2f");
        m_graph->axisX()->setRange(sampleMin, sampleMax);
        m_graph->axisY()->setRange(0.0f, 2.0f);
        m_graph->axisZ()->setRange(sampleMin, sampleMax);
        m_graph->axisX()->setLabelAutoRotation(30);
        m_graph->axisY()->setLabelAutoRotation(90);
        m_graph->axisZ()->setLabelAutoRotation(30);

        m_graph->removeSeries(m_heightMapSeries);
        m_graph->addSeries(m_sqrtSinSeries);

        // Reset range sliders for Sqrt&Sin
        m_rangeMinX = sampleMin;
        m_rangeMinZ = sampleMin;
        m_stepX = (sampleMax - sampleMin) / float(sampleCountX - 1);
        m_stepZ = (sampleMax - sampleMin) / float(sampleCountZ - 1);
        m_axisMinSliderX->setMaximum(sampleCountX - 2);
        m_axisMinSliderX->setValue(0);
        m_axisMaxSliderX->setMaximum(sampleCountX - 1);
        m_axisMaxSliderX->setValue(sampleCountX - 1);
        m_axisMinSliderZ->setMaximum(sampleCountZ - 2);
        m_axisMinSliderZ->setValue(0);
        m_axisMaxSliderZ->setMaximum(sampleCountZ - 1);
        m_axisMaxSliderZ->setValue(sampleCountZ - 1);
    }
}

void SurfaceGraph::enableHeightMapModel(bool enable)
{
    if (enable) {
        m_heightMapSeries->setDrawMode(QSurface3DSeries::DrawSurface);
        m_heightMapSeries->setFlatShadingEnabled(false);

        m_graph->axisX()->setLabelFormat("%.1f N");
        m_graph->axisZ()->setLabelFormat("%.1f E");
        m_graph->axisX()->setRange(34.0f, 40.0f);
        m_graph->axisY()->setAutoAdjustRange(true);
        m_graph->axisZ()->setRange(18.0f, 24.0f);

        m_graph->axisX()->setTitle(QStringLiteral("Latitude"));
        m_graph->axisY()->setTitle(QStringLiteral("Height"));
        m_graph->axisZ()->setTitle(QStringLiteral("Longitude"));

        m_graph->removeSeries(m_sqrtSinSeries);
        m_graph->addSeries(m_heightMapSeries);

        // Reset range sliders for height map
        int mapGridCountX = m_heightMapWidth / heightMapGridStepX;
        int mapGridCountZ = m_heightMapHeight / heightMapGridStepZ;
        m_rangeMinX = 34.0f;
        m_rangeMinZ = 18.0f;
        m_stepX = 6.0f / float(mapGridCountX - 1);
        m_stepZ = 6.0f / float(mapGridCountZ - 1);
        m_axisMinSliderX->setMaximum(mapGridCountX - 2);
        m_axisMinSliderX->setValue(0);
        m_axisMaxSliderX->setMaximum(mapGridCountX - 1);
        m_axisMaxSliderX->setValue(mapGridCountX - 1);
        m_axisMinSliderZ->setMaximum(mapGridCountZ - 2);
        m_axisMinSliderZ->setValue(0);
        m_axisMaxSliderZ->setMaximum(mapGridCountZ - 1);
        m_axisMaxSliderZ->setValue(mapGridCountZ - 1);
    }
}

void SurfaceGraph::adjustXMin(int min)
{
    float minX = m_stepX * float(min) + m_rangeMinX;

    int max = m_axisMaxSliderX->value();
    if (min >= max) {
        max = min + 1;
        m_axisMaxSliderX->setValue(max);
    }
    float maxX = m_stepX * max + m_rangeMinX;

    setAxisXRange(minX, maxX);
}

void SurfaceGraph::adjustXMax(int max)
{
    float maxX = m_stepX * float(max) + m_rangeMinX;

    int min = m_axisMinSliderX->value();
    if (max <= min) {
        min = max - 1;
        m_axisMinSliderX->setValue(min);
    }
    float minX = m_stepX * min + m_rangeMinX;

    setAxisXRange(minX, maxX);
}

void SurfaceGraph::adjustZMin(int min)
{
    float minZ = m_stepZ * float(min) + m_rangeMinZ;

    int max = m_axisMaxSliderZ->value();
    if (min >= max) {
        max = min + 1;
        m_axisMaxSliderZ->setValue(max);
    }
    float maxZ = m_stepZ * max + m_rangeMinZ;

    setAxisZRange(minZ, maxZ);
}

void SurfaceGraph::adjustZMax(int max)
{
    float maxX = m_stepZ * float(max) + m_rangeMinZ;

    int min = m_axisMinSliderZ->value();
    if (max <= min) {
        min = max - 1;
        m_axisMinSliderZ->setValue(min);
    }
    float minX = m_stepZ * min + m_rangeMinZ;

    setAxisZRange(minX, maxX);
}

void SurfaceGraph::setAxisXRange(float min, float max)
{
    m_graph->axisX()->setRange(min, max);
}

void SurfaceGraph::setAxisZRange(float min, float max)
{
    m_graph->axisZ()->setRange(min, max);
}

void SurfaceGraph::changeTheme(int theme)
{
    m_graph->activeTheme()->setType(Q3DTheme::Theme(theme));
}

void SurfaceGraph::setBlackToYellowGradient()
{
    QLinearGradient gr;
    gr.setColorAt(0.0, Qt::black);
    gr.setColorAt(0.33, Qt::blue);
    gr.setColorAt(0.67, Qt::red);
    gr.setColorAt(1.0, Qt::yellow);

    m_graph->seriesList().at(0)->setBaseGradient(gr);
    m_graph->seriesList().at(0)->setColorStyle(Q3DTheme::ColorStyleRangeGradient);
}

void SurfaceGraph::setGreenToRedGradient()
{
    QLinearGradient gr;
    gr.setColorAt(0.0, Qt::darkGreen);
    gr.setColorAt(0.5, Qt::yellow);
    gr.setColorAt(0.8, Qt::red);
    gr.setColorAt(1.0, Qt::darkRed);

    m_graph->seriesList().at(0)->setBaseGradient(gr);
    m_graph->seriesList().at(0)->setColorStyle(Q3DTheme::ColorStyleRangeGradient);
}