qt 实现画树功能

先上图片 

贴上主要的代码

    // 设置画笔颜色、宽度

    painter->setPen(QPen(QColor(0, 160, 230), 2));

    int widthRight = width() - padding_right;  //画图的最右边

    int heightTop =  padding_top; //画图的最上面

    int point_x = 0;

    int point_y = 0;

    double point_line_y = 0;

    QRectF rect1;

    for(int i =0 ; i <rect_wid_size; ++i){

        point_x = widthRight - rect_size.width()*(i+1) - Line_width*i;

        rect1 =  QRectF( point_x, point_y, rect_size.width(),rect_size.height()   );

        if( 0 == i ){

            for( int j =0; j<rect_height_size; ++j  ){

                point_y = heightTop+(height_interval+rect_size.height())*j;

                point_line_y = point_y + rect_size.height() /2;

                rect1 =  QRectF( point_x, point_y, rect_size.width(),rect_size.height()   );

                painter->drawRect( rect1   );

                painter->drawText( rect1 ,  Qt::AlignCenter, "test："+QString::number(i));

                painter->drawLine(QPointF(point_x, point_line_y), QPointF(point_x-Line_width/2, point_line_y));

                if( j < rect_height_size -1){

                    painter->drawLine(QPointF(point_x-Line_width/2, point_line_y),

                                      QPointF(point_x-Line_width/2, point_line_y+rect_size.height()+height_interval));

                }

            }

            point_line_y = (point_line_y - padding_top - rect_size.height()/2 ) /2 + padding_top+rect_size.height()/2;

            painter->drawLine(QPointF(point_x-Line_width/2, point_line_y), QPointF(point_x-Line_width, point_line_y));

        }else{

            rect1 =  QRectF( point_x, point_line_y - rect_size.height()/2, rect_size.width(),rect_size.height()   );

            painter->drawRect( rect1   );

            painter->drawText( rect1 ,  Qt::AlignCenter, "test："+QString::number(i));

            // 绘制直线

            if( i<rect_wid_size-1 ){

                painter->drawLine(QPointF(point_x, point_line_y), QPointF(point_x-Line_width, point_line_y));

            }

        }

全部代码见： http://download.csdn.net/download/chen136258/9977286