#include "custombars.h"
CustomBars::CustomBars(QCPAxis *keyAxis, QCPAxis *valueAxis)
: QCPBars(keyAxis, valueAxis),
mTextAlignment(Qt::AlignCenter),
mSpacing(5),
mFont(QFont(QLatin1String("sans serif"), 12))
{
}
void CustomBars::setTextAlignment(Qt::Alignment alignment)
{
mTextAlignment = alignment;
}
void CustomBars::setSpacing(double spacing)
{
mSpacing = spacing;
}
void CustomBars::setFont(const QFont &font)
{
mFont = font;
}
void CustomBars::draw(QCPPainter *painter)
{
if (!mKeyAxis || !mValueAxis) { qDebug() << Q_FUNC_INFO << "invalid key or value axis"; return; }
if (mDataContainer->isEmpty()) return;
QCPBarsDataContainer::const_iterator visibleBegin, visibleEnd;
getVisibleDataBounds(visibleBegin, visibleEnd);
// loop over and draw segments of unselected/selected data:
QList<QCPDataRange> selectedSegments, unselectedSegments, allSegments;
getDataSegments(selectedSegments, unselectedSegments);
allSegments << unselectedSegments << selectedSegments;
for (int i = 0; i < allSegments.size(); ++i)
{
bool isSelectedSegment = i >= unselectedSegments.size();
QCPBarsDataContainer::const_iterator begin = visibleBegin;
QCPBarsDataContainer::const_iterator end = visibleEnd;
mDataContainer->limitIteratorsToDataRange(begin, end, allSegments.at(i));
if (begin == end)
continue;
for (QCPBarsDataContainer::const_iterator it = begin; it != end; ++it)
{
// draw bar:
if (isSelectedSegment && mSelectionDecorator)
{
mSelectionDecorator->applyBrush(painter);
mSelectionDecorator->applyPen(painter);
}
else
{
painter->setBrush(mBrush);
painter->setPen(mPen);
}
applyDefaultAntialiasingHint(painter);
QRectF barRect = getBarRect(it->key, it->value); //自己加的
painter->drawPolygon(barRect);
// 以上是拷贝的源码部分
painter->drawPolygon(barRect);
// 我们仅需在 painter->drawPolygon(barRect); 这行下增加以下的内容即可
// 计算文字的位置
painter->setFont(mFont); // 设置字体
//QString text = QString::number(it->value); // 取得当前value轴的值，保留两位精度
QString text = mTextValue;
QRectF textRect = painter->fontMetrics().boundingRect(0, 0, 0, 0, Qt::TextDontClip | mTextAlignment, text); // 计算文字所占用的大小
if (mKeyAxis.data()->orientation() == Qt::Horizontal) { // 当key轴为水平轴的时候
if (mKeyAxis.data()->axisType() == QCPAxis::atTop) // 上轴，移动文字到柱状图下面
textRect.moveTopLeft(barRect.bottomLeft() + QPointF(0, mSpacing));
else // 下轴，移动文字到柱状图上面
textRect.moveBottomLeft(barRect.topLeft() - QPointF(0, mSpacing));
textRect.setWidth(barRect.width());
painter->drawText(textRect, Qt::TextDontClip | mTextAlignment, text);
}
else { // 当key轴为竖直轴的时候
if (mKeyAxis.data()->axisType() == QCPAxis::atLeft) // 左轴，移动文字到柱状图右边
textRect.moveTopLeft(barRect.topRight() + QPointF(mSpacing, 0));
else // 右轴，移动文字到柱状图左边
textRect.moveTopRight(barRect.topLeft() - QPointF(mSpacing, 0));
textRect.setHeight(barRect.height());
painter->drawText(textRect, Qt::TextDontClip | mTextAlignment, text);
}
}
}
}
