gridgeometry.cpp

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// Copyright (C) 2019 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
 
#include "gridgeometry_p.h"
#include <QtQuick3DRuntimeRender/private/qssgrendergeometry_p.h>
 
GridGeometry::GridGeometry()
    : QQuick3DGeometry()
{
    updateData();
}
 
GridGeometry::~GridGeometry()
{
 
}
 
int GridGeometry::horizontalLines() const
{
    return m_horLines;
}
 
int GridGeometry::verticalLines() const
{
    return m_vertLines;
}
 
float GridGeometry::horizontalStep() const
{
    return m_horStep;
}
 
float GridGeometry::verticalStep() const
{
    return m_vertStep;
}
 
void GridGeometry::setHorizontalLines(int count)
{
    count = qMax(count, 1);
    if (m_horLines == count)
        return;
    m_horLines = qMax(count, 1);
    emit horizontalLinesChanged();
    updateData();
    update();
}
 
void GridGeometry::setVerticalLines(int count)
{
    count = qMax(count, 1);
    if (m_vertLines == count)
        return;
    m_vertLines = qMax(count, 1);
    emit verticalLinesChanged();
    updateData();
    update();
}
 
void GridGeometry::setHorizontalStep(float step)
{
    step = qMax(step, 0.0f);
    if (qFuzzyCompare(m_horStep, step))
        return;
    m_horStep = step;
    emit horizontalStepChanged();
    updateData();
    update();
}
 
void GridGeometry::setVerticalStep(float step)
{
    step = qMax(step, 0.0f);
    if (qFuzzyCompare(m_vertStep, step))
        return;
    m_vertStep = step;
    emit verticalStepChanged();
    updateData();
    update();
}
 
static void fillVertexData(QByteArray &vertexData, int horLines, float horStep,
                           int vertLines, float vertStep)
{
    const int size = (horLines + vertLines) * sizeof(float) * 8 * 2;
    vertexData.resize(size);
    float *dataPtr = reinterpret_cast<float *>(vertexData.data());
 
    float y0 = -float(horLines - 1) * horStep * .5f;
    float x0 = -float(vertLines - 1) * vertStep * .5f;
    float y1 = -y0;
    float x1 = -x0;
 
    for (int i = 0; i < horLines; ++i) {
        // start position
        dataPtr[0] = x0;
        dataPtr[1] = y0 + i * horStep;
        dataPtr[2] = .0f;
        dataPtr[3] = 1.f;
 
        dataPtr[4] = 0;
        dataPtr[5] = 0;
        dataPtr[6] = 1.f;
        dataPtr[7] = 0;
 
        dataPtr += 8;
 
        // end position
        dataPtr[0] = x1;
        dataPtr[1] = y0 + i * horStep;
        dataPtr[2] = .0f;
        dataPtr[3] = 1.f;
 
        dataPtr[4] = 0;
        dataPtr[5] = 0;
        dataPtr[6] = 1.f;
        dataPtr[7] = 0;
 
        dataPtr += 8;
    }
 
    for (int i = 0; i < vertLines; ++i) {
        // start position
        dataPtr[0] = x0 + i * vertStep;
        dataPtr[1] = y0;
        dataPtr[2] = .0f;
        dataPtr[3] = 1.f;
 
        dataPtr[4] = 0;
        dataPtr[5] = 0;
        dataPtr[6] = 1.f;
        dataPtr[7] = 0;
 
        dataPtr += 8;
 
        // end position
        dataPtr[0] = x0 + i * vertStep;
        dataPtr[1] = y1;
        dataPtr[2] = .0f;
        dataPtr[3] = 1.f;
 
        dataPtr[4] = 0;
        dataPtr[5] = 0;
        dataPtr[6] = 1.f;
        dataPtr[7] = 0;
 
        dataPtr += 8;
    }
}
 
void GridGeometry::updateData()
{
    QByteArray vertexData;
    fillVertexData(vertexData, m_horLines, m_horStep, m_vertLines, m_vertStep);
    clear();
    addAttribute(QQuick3DGeometry::Attribute::PositionSemantic, 0,
                 QQuick3DGeometry::Attribute::ComponentType::F32Type);
    addAttribute(QQuick3DGeometry::Attribute::NormalSemantic, 16,
                 QQuick3DGeometry::Attribute::ComponentType::F32Type);
    setStride(32);
    setVertexData(vertexData);
    setPrimitiveType(QQuick3DGeometry::PrimitiveType::Lines);
    setBounds(QVector3D(float(-m_vertLines / 2), float(-m_horLines / 2), 0.0f) * m_horStep,
              QVector3D(float(m_vertLines / 2), float(m_horLines / 2), 0.0f) * m_vertStep);
}