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+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the Qt Design Tooling
+**
+** 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.
+**
+****************************************************************************/
+#include "graphicsview.h"
+#include "curveeditormodel.h"
+#include "curveitem.h"
+#include "utils.h"
+
+#include <QAction>
+#include <QMenu>
+#include <QResizeEvent>
+
+#include <cmath>
+
+namespace DesignTools {
+
+GraphicsView::GraphicsView(CurveEditorModel *model, QWidget *parent)
+ : QGraphicsView(parent)
+ , m_scene()
+ , m_style(model->style())
+ , m_model(model)
+ , m_dialog(m_style, this)
+ , m_zoomX(0.0)
+ , m_zoomY(0.0)
+{
+ setScene(&m_scene);
+ setAlignment(Qt::AlignLeft | Qt::AlignVCenter);
+ setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
+ setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
+ setViewportUpdateMode(QGraphicsView::FullViewportUpdate);
+
+ connect(&m_dialog, &CurveEditorStyleDialog::styleChanged, this, &GraphicsView::setStyle);
+
+ auto itemSlot = [this](unsigned int id, const AnimationCurve &curve) {
+ applyZoom(m_zoomX, m_zoomY);
+ m_model->setCurve(id, curve);
+ };
+
+ connect(&m_scene, &GraphicsScene::curveChanged, itemSlot);
+
+ applyZoom(m_zoomX, m_zoomY);
+ update();
+}
+
+void GraphicsView::setStyle(const CurveEditorStyle &style)
+{
+ m_style = style;
+
+ const auto itemList = items();
+ for (auto *item : itemList) {
+ if (auto *curveItem = qgraphicsitem_cast<CurveItem *>(item))
+ curveItem->setStyle(style);
+ }
+
+ applyZoom(m_zoomX, m_zoomY);
+ viewport()->update();
+}
+
+void GraphicsView::zoomX(double zoom)
+{
+ applyZoom(zoom, m_zoomY);
+ viewport()->update();
+}
+
+void GraphicsView::zoomY(double zoom)
+{
+ applyZoom(m_zoomX, zoom);
+ viewport()->update();
+}
+
+void GraphicsView::reset(const std::vector<CurveItem *> &items)
+{
+ m_scene.clear();
+ for (auto *item : items) {
+ m_scene.addCurveItem(item);
+ }
+
+ applyZoom(m_zoomX, m_zoomY);
+ viewport()->update();
+}
+
+void GraphicsView::resizeEvent(QResizeEvent *event)
+{
+ applyZoom(m_zoomX, m_zoomY);
+ QGraphicsView::resizeEvent(event);
+}
+
+void GraphicsView::contextMenuEvent(QContextMenuEvent *event)
+{
+ Q_UNUSED(event);
+
+ auto openStyleEditor = [this]() { m_dialog.show(); };
+
+ QMenu menu;
+ QAction *openEditorAction = menu.addAction(tr("Open Style Editor"));
+ connect(openEditorAction, &QAction::triggered, openStyleEditor);
+
+ menu.exec(event->globalPos());
+}
+
+void GraphicsView::drawForeground(QPainter *painter, const QRectF &rect)
+{
+ auto gap = QRectF(rect.topLeft(), QSizeF(m_style.valueAxisWidth, m_style.timeAxisHeight));
+
+ auto abscissa = QRectF(gap.topRight(), rect.topRight() + QPointF(0.0, gap.height()));
+ if (abscissa.isValid())
+ drawTimeScale(painter, abscissa);
+
+ auto ordinate = QRectF(gap.bottomLeft(), rect.bottomLeft() + QPointF(gap.width(), 0.0));
+ if (ordinate.isValid())
+ drawValueScale(painter, ordinate);
+
+ painter->fillRect(gap, m_style.backgroundAlternateBrush);
+}
+
+void GraphicsView::drawBackground(QPainter *painter, const QRectF &rect)
+{
+ painter->fillRect(rect, m_style.backgroundBrush);
+ painter->fillRect(scene()->sceneRect(), m_style.backgroundAlternateBrush);
+
+ drawGrid(painter, rect);
+ drawExtremaX(painter, rect);
+ drawExtremaY(painter, rect);
+}
+
+int GraphicsView::mapTimeToX(double time)
+{
+ return std::round(time * scaleX(m_transform));
+}
+
+int GraphicsView::mapValueToY(double y)
+{
+ return std::round(y * scaleY(m_transform));
+}
+
+double GraphicsView::mapXtoTime(int x)
+{
+ return static_cast<double>(x) / scaleX(m_transform);
+}
+
+double GraphicsView::mapYtoValue(int y)
+{
+ return static_cast<double>(y) / scaleY(m_transform);
+}
+
+void GraphicsView::applyZoom(double x, double y)
+{
+ m_zoomX = x;
+ m_zoomY = y;
+
+ double canvasWidth = rect().width() - m_style.valueAxisWidth - 2 * m_style.canvasMargin - rect().width() / 20.0;
+ double xZoomedOut = canvasWidth / (m_model->maximumTime() - m_model->minimumTime());
+ double xZoomedIn = m_style.zoomInWidth;
+ double scaleX = lerp(clamp(m_zoomX, 0.0, 1.0), xZoomedOut, xZoomedIn);
+
+ double canvasHeight = rect().height() - m_style.timeAxisHeight - 2 * m_style.canvasMargin - rect().height() / 10;
+ double yZoomedOut = canvasHeight / (m_scene.maximumValue() - m_scene.minimumValue());
+ double yZoomedIn = m_style.zoomInHeight;
+ double scaleY = lerp(clamp(m_zoomY, 0.0, 1.0), -yZoomedOut, -yZoomedIn);
+
+ m_transform = QTransform::fromScale(scaleX, scaleY);
+
+ QRectF sceneBounds;
+ for (auto *item : items())
+ if (auto *curveItem = qgraphicsitem_cast<CurveItem *>(item))
+ sceneBounds = sceneBounds.united(curveItem->setComponentTransform(m_transform));
+
+ updateSceneRect(sceneBounds);
+}
+
+void GraphicsView::updateSceneRect(const QRectF &rect)
+{
+ if (rect.isValid())
+ scene()->setSceneRect(rect);
+
+ QRectF sr = scene()->sceneRect().adjusted(
+ -m_style.valueAxisWidth - m_style.canvasMargin,
+ -m_style.timeAxisHeight - m_style.canvasMargin,
+ m_style.canvasMargin,
+ m_style.canvasMargin);
+
+ setSceneRect(sr);
+}
+
+void GraphicsView::drawGrid(QPainter *painter, const QRectF &rect)
+{
+ QRectF gridRect = rect.adjusted(
+ m_style.valueAxisWidth + m_style.canvasMargin,
+ m_style.timeAxisHeight + m_style.canvasMargin,
+ -m_style.canvasMargin,
+ -m_style.canvasMargin);
+
+ if (!gridRect.isValid())
+ return;
+
+ auto drawVerticalLine = [painter, gridRect](double position) {
+ painter->drawLine(position, gridRect.top(), position, gridRect.bottom());
+ };
+
+ painter->save();
+ painter->setPen(m_style.gridColor);
+
+ double timeIncrement = timeLabelInterval(painter, m_model->maximumTime());
+ for (double i = m_model->minimumTime(); i <= m_model->maximumTime(); i += timeIncrement)
+ drawVerticalLine(mapTimeToX(i));
+
+ painter->restore();
+}
+
+void GraphicsView::drawExtremaX(QPainter *painter, const QRectF &rect)
+{
+ auto drawVerticalLine = [rect, painter](double position) {
+ painter->drawLine(position, rect.top(), position, rect.bottom());
+ };
+
+ painter->save();
+ painter->setPen(Qt::red);
+ drawVerticalLine(mapTimeToX(m_model->minimumTime()));
+ drawVerticalLine(mapTimeToX(m_model->maximumTime()));
+ painter->restore();
+}
+
+void GraphicsView::drawExtremaY(QPainter *painter, const QRectF &rect)
+{
+ auto drawHorizontalLine = [rect, painter](double position) {
+ painter->drawLine(rect.left(), position, rect.right(), position);
+ };
+
+ painter->save();
+ painter->setPen(Qt::blue);
+ drawHorizontalLine(mapValueToY(m_scene.minimumValue()));
+ drawHorizontalLine(mapValueToY(m_scene.maximumValue()));
+
+ drawHorizontalLine(mapValueToY(0.0));
+
+ painter->restore();
+}
+
+void GraphicsView::drawTimeScale(QPainter *painter, const QRectF &rect)
+{
+ painter->save();
+ painter->setPen(m_style.fontColor);
+ painter->fillRect(rect, m_style.backgroundAlternateBrush);
+
+ QFontMetrics fm(painter->font());
+
+ auto paintLabeledTick = [this, painter, rect, fm](double time) {
+ QString timeText = QString("%1").arg(time);
+
+ int position = mapTimeToX(time);
+
+ QRect textRect = fm.boundingRect(timeText);
+ textRect.moveCenter(QPoint(position, rect.center().y()));
+ painter->drawText(textRect, Qt::AlignCenter, timeText);
+ painter->drawLine(position, rect.bottom() - 2, position, textRect.bottom() + 2);
+ };
+
+ double timeIncrement = timeLabelInterval(painter, m_model->maximumTime());
+ for (double i = m_model->minimumTime(); i <= m_model->maximumTime(); i += timeIncrement)
+ paintLabeledTick(i);
+
+ painter->restore();
+}
+
+void GraphicsView::drawValueScale(QPainter *painter, const QRectF &rect)
+{
+ painter->save();
+ painter->setPen(m_style.fontColor);
+ painter->fillRect(rect, m_style.backgroundAlternateBrush);
+
+ QFontMetrics fm(painter->font());
+ auto paintLabeledTick = [this, painter, rect, fm](double value) {
+ QString valueText = QString("%1").arg(value);
+
+ int position = mapValueToY(value);
+
+ QRect textRect = fm.boundingRect(valueText);
+ textRect.moveCenter(QPoint(rect.center().x(), position));
+ painter->drawText(textRect, Qt::AlignCenter, valueText);
+ };
+
+ paintLabeledTick(m_scene.minimumValue());
+ paintLabeledTick(m_scene.maximumValue());
+ painter->restore();
+}
+
+double GraphicsView::timeLabelInterval(QPainter *painter, double maxTime)
+{
+ QFontMetrics fm(painter->font());
+ int minTextSpacing = fm.width(QString("X%1X").arg(maxTime));
+
+ int deltaTime = 1;
+ int nextFactor = 5;
+
+ double tickDistance = mapTimeToX(deltaTime);
+ while (true) {
+ if (tickDistance > minTextSpacing)
+ break;
+
+ deltaTime *= nextFactor;
+ tickDistance = mapTimeToX(deltaTime);
+
+ if (nextFactor == 5)
+ nextFactor = 2;
+ else
+ nextFactor = 5;
+ }
+ return deltaTime;
+}
+
+} // End namespace DesignTools.