网站开发主要语言,成都定制网站设,wordpress禁用加载谷歌,110建筑人才网官网Label
前面的文章里面把QLabel批量引入ScrollArea作为预览窗口#xff0c;这篇把图像填充到QLable的PixelMap展示指定图像。
参数设置
设置QLabel的大小格式 QWidget* widget new QWidget;
widget-setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
widget-这篇把图像填充到QLable的PixelMap展示指定图像。
参数设置
设置QLabel的大小格式 QWidget* widget new QWidget;
widget-setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
widget-setMinimumSize(QSize(210, 210));QString msg Label_ QString::number(i);
QLabel* label new QLabel(msg);
label-setGeometry(QRect(0, 0, widget-width(), widget-height()));//全屏铺满
label-setMinimumSize(QSize(200, 200));
label-setAlignment(Qt::AlignVCenter | Qt::AlignHCenter);PixelMap填充
重点是PixelMap的填充所以这里像素值以渐变对象填充了。
// 创建一个渐变对象并设置渐变色
QLinearGradient gradient(0, 0, 200, 0); // 从左到右的线性渐变
gradient.setColorAt(0, Qt::red);
gradient.setColorAt(0.5, Qt::green);
gradient.setColorAt(1, Qt::blue);// 创建一个QPixmap并使用渐变填充
QPixmap pixmap(200, 200);
pixmap.fill(Qt::transparent); // 填充透明背景
QPainter painter(pixmap);
painter.fillRect(pixmap.rect(), gradient);label-setPixmap(pixmap);CV::Mat 到PixelMap填充
这里没有写cv::Mat到PixelMap的映射因为重点是PixelMap的功能展示以下是一个Mat到PixelMap对照的例子。
cv::Mat image cv::imread(1.jpg); // 替换为您的图像路径
QImage qimage(image.data, image.cols, image.rows, image.step, QImage::Format_RGB888);
qimage qimage.rgbSwapped();
QSize targetSize(200, 200);
qimage qimage.scaled(targetSize, Qt::KeepAspectRatio);
QPixmap pixmap QPixmap::fromImage(qimage);
label-setPixmap(pixmap);总体代码及效果
#pragma once#include QtWidgets/QMainWindow
#include QtWidgets
#include ui_dcmimgpro.hclass DcmImgPro : public QMainWindow
{Q_OBJECTpublic:DcmImgPro(QWidget *parent nullptr);~DcmImgPro();private:Ui::DcmImgProClass ui;
private slots:void pushbtn();void lineEditset();
private:int l_num 15;
};class ScrollableWidget:public QWidget
{
public:ScrollableWidget(int numWidgets){QVBoxLayout* layout new QVBoxLayout(this);for (int i 0; i numWidgets; i){QWidget* widget new QWidget;widget-setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);widget-setMinimumSize(QSize(210, 210));QString msg Label_ QString::number(i);QLabel* label new QLabel(msg);label-setGeometry(QRect(0, 0, widget-width(), widget-height()));//全屏铺满label-setMinimumSize(QSize(200, 200));label-setAlignment(Qt::AlignVCenter | Qt::AlignHCenter);// 创建一个渐变对象并设置渐变色QLinearGradient gradient(0, 0, 200, 0); // 从左到右的线性渐变gradient.setColorAt(0, Qt::red);gradient.setColorAt(0.5, Qt::green);gradient.setColorAt(1, Qt::blue);// 创建一个QPixmap并使用渐变填充QPixmap pixmap(200, 200);pixmap.fill(Qt::transparent); // 填充透明背景QPainter painter(pixmap);painter.fillRect(pixmap.rect(), gradient);label-setPixmap(pixmap);QVBoxLayout* widgetlayout new QVBoxLayout(widget);widgetlayout-addWidget(label);layout-addWidget(widget);}};};#include dcmimgpro.hDcmImgPro::DcmImgPro(QWidget *parent): QMainWindow(parent)
{ui.setupUi(this);ui.scrollArea-setWidgetResizable(true);ScrollableWidget* scrollableWidget new ScrollableWidget(l_num);ui.scrollArea-setWidget(scrollableWidget);ui.lineEdit-setText(QString::number(l_num));connect(ui.pushButton, SIGNAL(clicked()), this, SLOT(pushbtn()));connect(ui.lineEdit, SIGNAL(editingFinished()), this, SLOT(lineEditset()));//textChanged cursorPositionChanged//editingFinished selectionChanged returnPressed()
}void DcmImgPro::pushbtn()
{ui.scrollArea-setWidget(nullptr);ScrollableWidget* scrollableWidget new ScrollableWidget(l_num);ui.scrollArea-setWidget(scrollableWidget);
}void DcmImgPro::lineEditset()
{l_num ui.lineEdit-text().toInt();
}
DcmImgPro::~DcmImgPro()
{}
