如何等比例缩放图像

时间： 2021-07-31 作者：daque

作家：徐景周在夸大或减少图像时，怎样能最佳的维持图像原态比率来表露呢？底下供给一个涵数可帮你来实行，挪用它后，归来的矩形地区既为最好表露图像巨细。l 涵数中的第一个参数rcscreen为图像要被表露的矩形巨细，第二个参数sizepicture为图像自己巨细，第三个参数bcenter为能否居中表露，归来值crect既为图像最好表露巨细。涵数如次所示：crect rectsizewithconstantratio( crect* rcscreen, csize sizepicture, bool bcenter){ crect rect(rcscreen); double dwidth = rcscreen->width(); double dheight = rcscreen->height(); double daspectratio = dwidth/dheight; double dpicturewidth = sizepicture.cx; double dpictureheight = sizepicture.cy; double dpictureaspectratio = dpicturewidth/dpictureheight; //if the aspect ratios are the same then the screen rectangle // will do, otherwise we need to calculate the new rectangle if (dpictureaspectratio > daspectratio) { int nnewheight = (int)(dwidth/dpicturewidth*dpictureheight); int ncenteringfactor = (rcscreen->height() - nnewheight) / 2; rect.setrect( 0, ncenteringfactor, (int)dwidth, nnewheight + ncenteringfactor); } else if (dpictureaspectratio < daspectratio) { int nnewwidth = (int)(dheight/dpictureheight*dpicturewidth); int ncenteringfactor = (rcscreen->width() - nnewwidth) / 2; rect.setrect( ncenteringfactor, 0, nnewwidth + ncenteringfactor, (int)(dheight)); } return rect;};接洽办法：email：jingzhou_xu@163.net将来处事室(future studio)

如何等比例缩放图像

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