mirror of https://github.com/qt/qtgraphs.git
108 lines
2.8 KiB
C++
108 lines
2.8 KiB
C++
// Copyright (C) 2023 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
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#include "highlightseries.h"
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//! [2]
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const float darkRedPos = 1.f;
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const float redPos = 0.8f;
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const float yellowPos = 0.6f;
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const float greenPos = 0.4f;
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const float darkGreenPos = 0.2f;
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//! [2]
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HighlightSeries::HighlightSeries()
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{
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setDrawMode(QSurface3DSeries::DrawSurface);
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setShading(QSurface3DSeries::Shading::Flat);
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setVisible(false);
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}
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HighlightSeries::~HighlightSeries() = default;
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//! [0]
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void HighlightSeries::setTopographicSeries(TopographicSeries *series)
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{
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m_topographicSeries = series;
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m_srcWidth = m_topographicSeries->dataArray().at(0).size();
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m_srcHeight = m_topographicSeries->dataArray().size();
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QObject::connect(m_topographicSeries,
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&QSurface3DSeries::selectedPointChanged,
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this,
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&HighlightSeries::handlePositionChange);
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}
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//! [0]
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//! [1]
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void HighlightSeries::handlePositionChange(const QPoint &position)
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{
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m_position = position;
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if (position == invalidSelectionPosition()) {
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setVisible(false);
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return;
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}
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int halfWidth = m_width / 2;
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int halfHeight = m_height / 2;
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int startX = position.x() - halfWidth;
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if (startX < 0)
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startX = 0;
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int endX = position.x() + halfWidth;
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if (endX > (m_srcWidth - 1))
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endX = m_srcWidth - 1;
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int startZ = position.y() - halfHeight;
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if (startZ < 0)
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startZ = 0;
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int endZ = position.y() + halfHeight;
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if (endZ > (m_srcHeight - 1))
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endZ = m_srcHeight - 1;
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const QSurfaceDataArray &srcArray = m_topographicSeries->dataArray();
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QSurfaceDataArray dataArray;
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dataArray.reserve(endZ - startZ);
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for (int i = startZ; i < endZ; ++i) {
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QSurfaceDataRow newRow;
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newRow.reserve(endX - startX);
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QSurfaceDataRow srcRow = srcArray.at(i);
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for (int j = startX; j < endX; ++j) {
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QVector3D pos = srcRow.at(j).position();
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pos.setY(pos.y() + m_heightAdjustment);
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newRow.append(QSurfaceDataItem(pos));
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}
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dataArray.append(newRow);
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}
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dataProxy()->resetArray(dataArray);
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setVisible(true);
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}
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//! [1]
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//! [3]
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void HighlightSeries::handleGradientChange(float value)
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{
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float ratio = m_minHeight / value;
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QLinearGradient gr;
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gr.setColorAt(0.f, Qt::black);
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gr.setColorAt(darkGreenPos * ratio, Qt::darkGreen);
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gr.setColorAt(greenPos * ratio, Qt::green);
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gr.setColorAt(yellowPos * ratio, Qt::yellow);
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gr.setColorAt(redPos * ratio, Qt::red);
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gr.setColorAt(darkRedPos * ratio, Qt::darkRed);
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setBaseGradient(gr);
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setColorStyle(QGraphsTheme::ColorStyle::RangeGradient);
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handleZoomChange(ratio);
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}
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//! [3]
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void HighlightSeries::handleZoomChange(float zoom)
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{
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m_heightAdjustment = (1.2f - zoom) * 10.f;
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}
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