Qt使用九宫格原理缩放图片

来源：互联网发布：万物生长齐溪好丑知乎编辑：程序博客网时间：2024/05/02 03:02

9宫格缩放规则如下：
1、将一张图分割成9块
2、四个角(1,3,7,9)在缩放的时候是保持大小不变
3、图块2，8仅当宽度变化时缩放宽度。
4、图块4，6仅当高度变化时缩放高度。
5、图块5当图片大小发生变化，宽度和高度都进行缩放。

/***  功能             : 九宫格图处理**  picName          : 图片名字**  iHorzSplit       : 四个角上格子的宽度**  iVertSplit       : 四个角上格子的高度**  DstWidth         : 整个图片缩放的宽度**  DstWidth         : 整个图片缩放的高度**  返回值           : 处理完成的图片*/QPixmap* NinePatch(QString& picName,int iHorzSplit,int iVertSplit, int DstWidth, int DstHeight){    QPixmap* pix = new QPixmap(picName);     int pixWidth = pix->width();    int pixHeight = pix->height();     QPixmap pix_1 = pix->copy(0, 0, iHorzSplit, iVertSplit);    QPixmap pix_2 = pix->copy(iHorzSplit, 0, pixWidth-iHorzSplit*2, iVertSplit);    QPixmap pix_3 = pix->copy(pixWidth-iHorzSplit, 0, iHorzSplit, iVertSplit);     QPixmap pix_4 = pix->copy(0, iVertSplit, iHorzSplit, pixHeight-iVertSplit*2);    QPixmap pix_5 = pix->copy(iHorzSplit, iVertSplit, pixWidth-iHorzSplit*2, pixHeight-iVertSplit*2);    QPixmap pix_6 = pix->copy(pixWidth-iHorzSplit, iVertSplit, iHorzSplit, pixHeight-iVertSplit*2);     QPixmap pix_7 = pix->copy(0, pixHeight-iVertSplit, iHorzSplit, iVertSplit);    QPixmap pix_8 = pix->copy(iHorzSplit, pixHeight-iVertSplit, pixWidth-iHorzSplit*2, pixWidth - iHorzSplit*2);    QPixmap pix_9 = pix->copy(pixWidth-iHorzSplit, pixHeight-iVertSplit, iHorzSplit, iVertSplit);     pix_2 = pix_2.scaled(DstWidth-iHorzSplit*2,iVertSplit, Qt::IgnoreAspectRatio);//保持高度拉宽    pix_4 = pix_4.scaled(iHorzSplit, DstHeight-iVertSplit*2, Qt::IgnoreAspectRatio);//保持宽度拉高    pix_5 = pix_5.scaled(DstWidth-iHorzSplit*2,DstHeight-iVertSplit*2, Qt::IgnoreAspectRatio);//宽高都缩放    pix_6 = pix_6.scaled(iHorzSplit, DstHeight-iVertSplit*2, Qt::IgnoreAspectRatio);//保持宽度拉高    pix_8 = pix_8.scaled(DstWidth-iHorzSplit*2, iVertSplit);//保持高度拉宽      QPixmap* resultImg =new QPixmap(DstWidth, DstHeight);    QPainter* painter = new QPainter(resultImg);    if (!resultImg->isNull()) {        painter->drawPixmap(0,0,pix_1);        painter->drawPixmap(iHorzSplit, 0, pix_2);        painter->drawPixmap(DstWidth-iHorzSplit,0,pix_3);         painter->drawPixmap(0, iVertSplit, pix_4);        painter->drawPixmap(iHorzSplit, iVertSplit, pix_5);        painter->drawPixmap(DstWidth-iHorzSplit, iVertSplit, pix_6);         painter->drawPixmap(0, DstHeight-iVertSplit, pix_7);        painter->drawPixmap(iHorzSplit, DstHeight-iVertSplit, pix_8);        painter->drawPixmap(DstWidth-iHorzSplit, DstHeight-iVertSplit, pix_9);        painter->end();    }    return resultImg;}

参考链接：http://bbs.csdn.net/topics/390506636

3 0