自己切片做网站,网站建设百度云资源,简述建设网站的基本流程,公司seo上一篇文章QT截图程序#xff0c;可多屏幕截图二#xff0c;增加调整截图区域功能-CSDN博客描述了如何截取#xff0c;具备调整边缘功能后已经方便使用了#xff0c;但是与系统自带的程序相比#xff0c;似乎没有什么特别#xff0c;只能截取矩形区域。
如果可以按照自己…上一篇文章QT截图程序可多屏幕截图二增加调整截图区域功能-CSDN博客描述了如何截取具备调整边缘功能后已经方便使用了但是与系统自带的程序相比似乎没有什么特别只能截取矩形区域。
如果可以按照自己定义截取多边形那样功能会强大许多。下面是程序主要功能截取任意边的多边形不规则形状截取的好帮手。先看看效果。这是截取到的图像 具体步骤 操作方法使用左键点击选择点右键点击时最后一个点和第一个点连接完成截图。按下空格键跳转到保存界面。
思路
1. 记录点击的每个点然后把它们当成多边形绘制在屏幕上
QPainter painter(this);painter.setPen(Qt::red);if (m_points.size() 1){painter.drawLine(m_points.at(0), QCursor::pos()); //只有一个点线随着鼠标活动}else if (m_points.size() 1){int i1;for (i1; im_points.size(); i){painter.drawLine(m_points.at(i-1), m_points.at(i));}if (snapstate Snapped){painter.drawLine(m_points.at(i-1), m_points.at(0)); //最后一个点和初始点连接}else{painter.drawLine(m_points.at(i-1), QCursor::pos()); //最后一个点线随着鼠标活动}}
2. 完成时将所选区域透明化来做区分。
QRegion all(0, 0, width(), height());
QPolygon tempMask(this-m_points.toVector());QRegion sub(tempMask);
setMask(all.subtracted(sub));
m_maskRect tempMask.boundingRect();
3. 取所选多边形的边框矩形然后将它从大图中分离出来
QImage img combined.copy(m_maskRect).toImage(); //根据选中区域的边框剪裁图像
img.convertTo(QImage::Format_RGBA8888);
4. 平移多边形使它位于剪裁后的区域
QPolygon tempMask(this-m_points.toVector());tempMask.translate(-m_maskRect.x(), -m_maskRect.y()); //平移多边形使它位于剪裁后的区域
5. 根据多边形所在区域判断矩形上的点是否在多边形内通过图像alpha值来设置点的可见度
QPainterPath path;path.addPolygon(tempMask);
for (int i0; iimg.width(); i)
{for (int j0; jimg.height(); j){QColor col img.pixelColor(i, j);QPainterPath pathPoint QPainterPath(QPointF(i,j));if(path.contains(pathPoint))//判断位置i,j是否在多边形内{col.setAlpha(255);}else{col.setAlpha(0);}img.setPixelColor(i,j,col);}
}
平移和提取的示意图第一步类似在窗口里选中了一个多边形红色矩形是多边形的boundingRect
第二部截取矩形边框类似将矩形边框平移到左上角 第三步第二部的操作导致矩形和多边形不重叠此时要移动多边形然后将只留它们。 代码
源文件
#include maskwidget.h
#include ui_maskwidget.h
#include QMouseEvent
#include QRegion
#include QScreen
#include QPainter
#include QGuiApplication
#include QPixmap
#include QCursor
#include QList
#include QPolygon
#include QPainterPath
#include QDebug//const int MINSIZE 10;MaskWidget::MaskWidget(QWidget *parent) :QWidget(parent),ui(new Ui::MaskWidget)
{ui-setupUi(this);setMouseTracking(true);setWindowFlags(Qt::FramelessWindowHint);setWindowOpacity(0.8);QListQScreen* screens QGuiApplication::screens();int width 0;int height 0;for (QScreen *screen : screens){width screen-geometry().width();if (height screen-geometry().height()){height screen-geometry().height();}}this-setFixedSize(width, height);m.hide();connect(m, SIGNAL(resetSnap()), this, SLOT(ResetSnap()));
}MaskWidget::~MaskWidget()
{delete ui;
}void MaskWidget::mousePressEvent(QMouseEvent *event)
{qDebug() __func__event-pos();if (event-button() Qt::LeftButton){if (snapstate NoSnap){m_points.push_back(event-pos());}}if (event-button() Qt::RightButton){snapstate Snapped;QRegion all(0, 0, width(), height());QPolygon tempMask(this-m_points.toVector());QRegion sub(tempMask);setMask(all.subtracted(sub));m_maskRect tempMask.boundingRect();}update();QWidget::mousePressEvent(event);
}void MaskWidget::mouseReleaseEvent(QMouseEvent *event)
{update();return QWidget::mouseReleaseEvent(event);
}void MaskWidget::mouseMoveEvent(QMouseEvent* event)
{update();return QWidget::mouseMoveEvent(event);
}void MaskWidget::paintEvent(QPaintEvent *)
{QPainter painter(this);painter.setPen(Qt::red);if (m_points.size() 1){painter.drawLine(m_points.at(0), QCursor::pos()); //只有一个点线随着鼠标活动}else if (m_points.size() 1){int i1;for (i1; im_points.size(); i){painter.drawLine(m_points.at(i-1), m_points.at(i));}if (snapstate Snapped){painter.drawLine(m_points.at(i-1), m_points.at(0)); //最后一个点和初始点连接}else{painter.drawLine(m_points.at(i-1), QCursor::pos()); //最后一个点线随着鼠标活动}}}void MaskWidget::keyPressEvent(QKeyEvent *event)
{if (event-key() Qt::Key_Escape){close();}else if (event-key() Qt::Key_Space) //空格键截图{QPixmap combined(this-width(), this-height());combined.fill(Qt::transparent);QPainter painter(combined);QListQScreen* screens QGuiApplication::screens();for (QScreen *screen : screens){m_image screen-grabWindow(0);painter.drawPixmap(screen-geometry().x(), 0, screen-geometry().width(), screen-geometry().height(), m_image);}QImage img combined.copy(m_maskRect).toImage(); //根据选中区域的边框剪裁图像img.convertTo(QImage::Format_RGBA8888);QPainterPath path;QPolygon tempMask(this-m_points.toVector());tempMask.translate(-m_maskRect.x(), -m_maskRect.y()); //平移多边形使它位于剪裁后的区域path.addPolygon(tempMask);for (int i0; iimg.width(); i){for (int j0; jimg.height(); j){QColor col img.pixelColor(i, j);QPainterPath pathPoint QPainterPath(QPointF(i,j));if(path.contains(pathPoint))//判断位置i,j是否在多边形内{col.setAlpha(255);}else{col.setAlpha(0);}img.setPixelColor(i,j,col);}}QPixmap pix QPixmap::fromImage(img);m.SetImage(pix);this-hide();m.show();}QWidget::keyPressEvent(event);
}void MaskWidget::showEvent(QShowEvent *event)
{QWidget::showEvent(event);
}void MaskWidget::ResetSnap()
{QRegion all(0, 0, width(), height());setMask(all);m_maskRect.setRect(0,0,0,0);snapstate NoSnap;m_points.clear();this-show();
}头文件
#ifndef MASKWIDGET_H
#define MASKWIDGET_H#include QWidget
#include mainwindow.h
namespace Ui {
class MaskWidget;
}
enum SnapState{NoSnap,Snapped,PreLeftDrag,LeftDrag,PreRightDrag,RightDrag,PreTopDrag,TopDrag,PreBottomDrag,BottomDrag
};class MaskWidget : public QWidget
{Q_OBJECTpublic:explicit MaskWidget(QWidget *parent nullptr);~MaskWidget();
protected:void mousePressEvent(QMouseEvent *event)override;void mouseReleaseEvent(QMouseEvent *event)override;void mouseMoveEvent(QMouseEvent *event)override;void paintEvent(QPaintEvent *event)override;void keyPressEvent(QKeyEvent *event) override;void showEvent(QShowEvent *event) override;private slots:void ResetSnap();private:QPoint m_pressPos;QPoint m_newPos;QRect m_maskRect{0, 0, 0, 0};QPixmap m_image;bool isPressed{false};MainWindow m;SnapState snapstate{NoSnap};QListQPoint m_points;
private:Ui::MaskWidget *ui;};#endif // MASKWIDGET_Hmainwindow.cpp同第二篇文章
#include mainwindow.h
#include ui_mainwindow.h
#include QDebug
#include QFileDialog
#include QPushButtonMainWindow::MainWindow(QWidget *parent): QMainWindow(parent), ui(new Ui::MainWindow)
{ui-setupUi(this);this-setWindowTitle(QString(tr(截图)));ui-centralwidget-setMouseTracking(true);ui-comboBox-addItem(QString(tr(.)));ui-comboBox-addItem(QString(tr(Select Folder)));connect(ui-comboBox, SIGNAL(activated(int)), this, SLOT(SelectFolder(int)));connect(ui-button_reset, SIGNAL(clicked(bool)), this, SLOT(ResetSnap(bool)));connect(ui-button_save, SIGNAL(clicked(bool)), this, SLOT(SavePicture(bool)));
}MainWindow::~MainWindow()
{delete ui;
}void MainWindow::mouseMoveEvent(QMouseEvent *event)
{qDebug()this-geometry();QMainWindow::mouseMoveEvent(event);
}void MainWindow::SetImage(QPixmap pixmap)
{const double defultWidth 400.0;const double defaultHeight 160.0;ui-label-setPixmap(pixmap);double pixscale 1.0 * pixmap.width()/pixmap.height();double initscale defultWidth/defaultHeight;if (pixscale initscale){ui-label-setFixedWidth(defultWidth);ui-label-setFixedHeight(defultWidth / pixscale);}else{ui-label-setFixedHeight(defaultHeight);ui-label-setFixedWidth(defaultHeight * pixscale);}
}void MainWindow::SelectFolder(int index)
{if (index 1){qDebug()ui-comboBox-itemText(index);QString directory QFileDialog::getExistingDirectory(this,tr(QFileDialog::getExistingDirectory()),.);if (!directory.isEmpty()){qDebug()directory;ui-comboBox-addItem(directory);ui-comboBox-setCurrentText(directory);}}
}void MainWindow::ResetSnap(bool)
{this-hide();emit resetSnap();
}void MainWindow::SavePicture(bool)
{if (ui-comboBox-currentText() ! .){ui-label-pixmap()-save(ui-comboBox-currentText() / ui-lineEdit-text(), PNG);}else{ui-label-pixmap()-save(ui-lineEdit-text(), PNG);}
}mainwindow.h同第二篇文章
#ifndef MAINWINDOW_H
#define MAINWINDOW_H#include QMainWindowQT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACEclass MainWindow : public QMainWindow
{Q_OBJECTpublic:MainWindow(QWidget *parent nullptr);~MainWindow();void SetImage(QPixmap pixmap);protected:void mouseMoveEvent(QMouseEvent *event) override;private slots:void SelectFolder(int index);void ResetSnap(bool);void SavePicture(bool);signals:void resetSnap();private:Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H
