Method paintEvent

ChessBoard.cpp:231–328

}

void ChessBoard::paintEvent(QPaintEvent *event)
{
    QMainWindow::paintEvent(event);

    QPointF boardOrigin;
    qreal boardSide = 0.0;
    if (!boardTransform(boardOrigin, boardSide))
        return;

    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing, true);

    // 填充整个棋盘区域背景（label 范围），深木色作为桌面底色
    const QPoint labelTopLeft = ui->label->mapTo(this, QPoint(0, 0));
    QRectF fullBg(labelTopLeft.x(), labelTopLeft.y(),
                  ui->label->width(), ui->label->height());
    QLinearGradient outerBg(fullBg.topLeft(), fullBg.bottomRight());
    outerBg.setColorAt(0, QColor(160, 120, 80));
    outerBg.setColorAt(1, QColor(130, 95, 60));
    painter.setPen(Qt::NoPen);
    painter.setBrush(outerBg);
    painter.drawRect(fullBg);

    painter.save();
    painter.translate(boardOrigin);
    const qreal scale = boardSide / 960.0;
    painter.scale(scale, scale);

        m_nOffSet = 60.0;  //距离界面的边距
        m_nD = 90.0;       //间距为50px
        m_nR = m_nD/2.0;   //棋子半径为d/2

        //*******************绘画棋盘*******************
        // 棋盘背景：木纹色渐变
        QRectF boardRect(m_nOffSet - m_nR, m_nOffSet - m_nR,
                         8 * m_nD + 2 * m_nR, 9 * m_nD + 2 * m_nR);
        QLinearGradient bgGrad(boardRect.topLeft(), boardRect.bottomRight());
        bgGrad.setColorAt(0, QColor(222, 184, 135));
        bgGrad.setColorAt(1, QColor(205, 170, 125));
        painter.setPen(Qt::NoPen);
        painter.setBrush(bgGrad);
        painter.drawRoundedRect(boardRect, 6, 6);

        // 棋盘线条：深棕色
        QPen boardPen(QColor(101, 67, 33), 2.0);
        painter.setPen(boardPen);

        //绘画10条横线
        for(int i = 0; i <= 9; i++)
            painter.drawLine(QPointF(m_nOffSet, m_nOffSet+i*m_nD), QPointF(m_nOffSet+8*m_nD, m_nOffSet+i*m_nD));

        //绘画9条竖线
        for(int i = 0; i <= 8; i++)
        {
            if(i==0 || i==8)
            {
                painter.drawLine(QPointF(m_nOffSet+i*m_nD, m_nOffSet), QPointF(m_nOffSet+i*m_nD, m_nOffSet+9*m_nD));
            }