缩放并转换Qgraphicspixmapitem [英] Scaled and transform Qgraphicspixmapitem

问题描述

缩放和转换QGraphicsPixmapItem时遇到问题.我创建了图形编辑器，在其中使用初始大小为100,100的QGraphicsItem，然后通过setTransform()方法调整大小和旋转它.

I have a problem while scaling and transforming QGraphicsPixmapItem. I have created graphics editor in which I am using QGraphicsItem of initial size 100,100 and after that I am resizing and rotating it by setTransform() method.

此后，我将存储此转换并将其用于另一个名为播放器的应用程序，在该应用程序中我将使用这些转换并在其上显示图像和视频，如果我设置了scale和setTransform对其清晰度进行成像的方法被破坏了.

After that I am storing this transform and using these for my another application called player in which I am using those transform and showing images and videos on it, I am using QgraphicsPixmapItem to show images now if I set scaled and setTransform methods to image its clarity gets spoiled.

即使缩放和变换图像，也可以保持其清晰度.我使用的图像大小为2560x1440像素. 任何帮助将不胜感激.

Is it possible to keep clarity as it is even if I scaled and transform it.The image I am using is of 2560x1440 pixels. Any help will be appreciated.

代码是:

QGraphicsPixmapItem *pixitem = new QGraphicsPixmapItem;
pixitem->setFlags(QGraphicsItem::ItemIsMovable);
pixitem->setPos(50,50);
QTransform trans;
trans.setMatrix(4.20399,2.9286,0,-3.86601,0.761397,0,33.1015,-134.5,1);
pixitem->setPixmap(QPixmap("abc.jpg").scaled(100,100));
pixitem->setTransform(trans);
pixitem->setShapeMode(QGraphicsPixmapItem::MaskShape);
scene->addItem(pixitem);

推荐答案

您可以使用setTransformationMode函数设置像素图项目的转换模式.默认值为Qt::FastTransformation.您应该将转换模式设置为Qt::SmoothTransformation以启用双线性过滤，这样在缩放时可获得更好的质量:

You can use setTransformationMode function to set the pixmap item's transformation mode. The default value is Qt::FastTransformation. You should set the transform mode to Qt::SmoothTransformation to enable bilinear filtering which results in a better quality when scaled :

pixitem->setTransformationMode(Qt::SmoothTransformation);

这篇关于缩放并转换Qgraphicspixmapitem的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！