15:14 提问
在qt5 pieview中画条形图，有代码 求高手讲解一下，急求！！！！！
#include "pieview.h"
PieView::PieView(QWidget *parent) :
QAbstractItemView(parent)
void PieView::paintEvent(QPaintEvent *)
QPainter painter(viewport());
painter.setPen(Qt::black);
int x0=40;
int y0=250;
painter.drawLine(x0,y0,40,30);
painter.drawLine(38,32,40,30);
painter.drawLine(40,30,42,32);
painter.drawText(20,30,tr("销售数量"));
for(int i=1;i&5;i++)
painter.drawLine(-1,-i*50,1,-i*50);
painter.drawText(-20,-i*50,tr("%1").arg(i*5));
//x 坐标轴
painter.drawLine(x0,y0,540,250);
painter.drawLine(538,248,540,250);
painter.drawLine(540,250,538,252);
painter.drawText(545,250,tr("品牌"));
int pos=x0+20;
for(row=0;row&model()-&rowCount(rootIndex());row++)
QModelIndex index=model()-&index(row,0,rootIndex());
QString dep=model()-&data(index).toString();
painter.drawText(pos,y0+20,dep);
int posN=x0+20;
for(row=0;row&model()-&rowCount(rootIndex());row++)
QModelIndex index=model()-&index(row,1,rootIndex());
int sell=model()-&data(index).toDouble();
int width=10;
QModelIndex colorIndex = model()-&index(row,0,rootIndex());
QColor color = QColor(model()-&data(colorIndex,Qt::DecorationRole).toString());
if(selections-&isSelected(index))
painter.setBrush(QBrush(color,Qt::Dense3Pattern));
painter.setBrush(QBrush(color));
painter.drawRect(QRect(posN,y0-sell*10,width,sell*10));
QRegion regionM(posN,y0-sell*10,width,sell*10);
RegionList&®ionM;
void PieView::setSelectionModel(QItemSelectionModel *selectionModel)
selections = selectionM
QRegion PieView::itemRegion(QModelIndex index)
if (index.column() == 1)
// 销售数量
region = RegionList[index.row()];
QModelIndex PieView::indexAt(const QPoint &point) const
QPoint newPoint(point.x(),point.y());
foreach(region,RegionList)
// 销售数量 列
if (region.contains(newPoint))
int row = RegionList.indexOf(region);
QModelIndex index = model()-&index(row,1,rootIndex());
return QModelIndex();
QRect PieView::visualRect(const QModelIndex &index) const{}
void PieView::scrollTo(const QModelIndex &index, ScrollHint hint){}
QModelIndex PieView::moveCursor(CursorAction cursorAction, Qt::KeyboardModifiers modifiers){}
int PieView::horizontalOffset()const{}
int PieView::verticalOffset()const{}
bool PieView::isIndexHidden(const QModelIndex &index) const{}
void PieView::setSelection(const QRect &rect, QItemSelectionModel::SelectionFlags command){}
QRegion PieView::visualRegionForSelection(const QItemSelection &selection) const{}
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