Revision control
Copy as Markdown
// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#undef QT_NO_FOREACH // this file contains unported legacy Q_FOREACH uses
#include "axisrendercache_p.h"
#include <QtGui/QFontMetrics>
QT_BEGIN_NAMESPACE
AxisRenderCache::AxisRenderCache()
: m_type(QAbstract3DAxis::AxisTypeNone),
m_min(0.0f),
m_max(10.0f),
m_segmentCount(5),
m_subSegmentCount(1),
m_reversed(false),
m_font(QFont(QStringLiteral("Arial"))),
m_formatter(0),
m_ctrlFormatter(0),
m_drawer(0),
m_positionsDirty(true),
m_translate(0.0f),
m_scale(1.0f),
m_labelAutoRotation(0.0f),
m_titleVisible(false),
m_titleFixed(false)
{
}
AxisRenderCache::~AxisRenderCache()
{
for (auto label: m_labelItems)
delete label;
m_titleItem.clear();
delete m_formatter;
}
void AxisRenderCache::setDrawer(Drawer *drawer)
{
m_drawer = drawer;
m_font = m_drawer->font();
if (m_drawer)
updateTextures();
}
void AxisRenderCache::setType(QAbstract3DAxis::AxisType type)
{
m_type = type;
// If type is set, it means completely new axis instance, so clear all old data
m_labels.clear();
m_title.clear();
m_min = 0.0f;
m_max = 10.0f;
m_segmentCount = 5;
m_subSegmentCount = 1;
m_labelFormat.clear();
m_titleItem.clear();
for (auto label: m_labelItems)
delete label;
m_labelItems.clear();
}
void AxisRenderCache::setTitle(const QString &title)
{
if (m_title != title) {
m_title = title;
// Generate axis label texture
if (m_drawer)
m_drawer->generateLabelItem(m_titleItem, title);
}
}
void AxisRenderCache::setLabels(const QStringList &labels)
{
if (m_labels != labels) {
int newSize(labels.size());
int oldSize(m_labels.size());
for (int i = newSize; i < oldSize; i++)
delete m_labelItems.takeLast();
m_labelItems.reserve(newSize);
int widest = maxLabelWidth(labels);
for (int i = 0; i < newSize; i++) {
if (i >= oldSize)
m_labelItems.append(new LabelItem);
if (m_drawer) {
if (labels.at(i).isEmpty()) {
m_labelItems[i]->clear();
} else if (i >= oldSize || labels.at(i) != m_labels.at(i)
|| m_labelItems[i]->size().width() != widest) {
m_drawer->generateLabelItem(*m_labelItems[i], labels.at(i), widest);
}
}
}
m_labels = labels;
}
}
void AxisRenderCache::updateAllPositions()
{
// As long as grid and subgrid lines are drawn identically, we can further optimize
// by caching all grid and subgrid positions into a single list.
// If subgrid lines are ever themed separately, this array will probably become obsolete.
if (m_formatter) {
int gridCount = m_formatter->gridPositions().size();
int subGridCount = m_formatter->subGridPositions().size();
int labelCount = m_formatter->labelPositions().size();
int fullSize = gridCount + subGridCount;
m_adjustedGridLinePositions.resize(fullSize);
m_adjustedLabelPositions.resize(labelCount);
int index = 0;
int grid = 0;
int label = 0;
float position = 0.0f;
for (; label < labelCount; label++) {
position = m_formatter->labelPositions().at(label);
if (m_reversed)
position = 1.0f - position;
m_adjustedLabelPositions[label] = position * m_scale + m_translate;
}
for (; grid < gridCount; grid++) {
position = m_formatter->gridPositions().at(grid);
if (m_reversed)
position = 1.0f - position;
m_adjustedGridLinePositions[index++] = position * m_scale + m_translate;
}
for (int subGrid = 0; subGrid < subGridCount; subGrid++) {
position = m_formatter->subGridPositions().at(subGrid);
if (m_reversed)
position = 1.0f - position;
m_adjustedGridLinePositions[index++] = position * m_scale + m_translate;
}
m_positionsDirty = false;
}
}
void AxisRenderCache::updateTextures()
{
m_font = m_drawer->font();
if (m_title.isEmpty())
m_titleItem.clear();
else
m_drawer->generateLabelItem(m_titleItem, m_title);
int widest = maxLabelWidth(m_labels);
for (int i = 0; i < m_labels.size(); i++) {
if (m_labels.at(i).isEmpty())
m_labelItems[i]->clear();
else
m_drawer->generateLabelItem(*m_labelItems[i], m_labels.at(i), widest);
}
}
void AxisRenderCache::clearLabels()
{
m_titleItem.clear();
for (int i = 0; i < m_labels.size(); i++)
m_labelItems[i]->clear();
}
int AxisRenderCache::maxLabelWidth(const QStringList &labels) const
{
int labelWidth = 0;
QFont labelFont = m_font;
labelFont.setPointSize(textureFontSize);
QFontMetrics labelFM(labelFont);
for (int i = 0; i < labels.size(); i++) {
int newWidth = labelFM.horizontalAdvance(labels.at(i));
if (labelWidth < newWidth)
labelWidth = newWidth;
}
return labelWidth;
}
QT_END_NAMESPACE