Qt 简单截图工具(一) 高仿QQ截屏 滑动截屏
2024-05-16 22:41:38
目录
- 本系列目录
- 功能考虑
- 滑动鼠标截取当前桌面显示内容
- 滑动鼠标截取桌面图片
- 截图辅助功能
- 截取部分二次处理
- 代码实现
本系列目录
Qt 简单截图工具(一) 高仿QQ截屏 滑动截屏
Qt 简单截图工具(二) 添加菜单栏，添加取色器、切图功能
# 截屏工具分析
- 闲来无聊，在学习qt几个月后突然想制作一个截屏工具来给自己使用。简单分析了一下，认为截屏方式共可以分为三种：
- 获取当前窗口或控件的界面保存为图片
- 滑动鼠标截取当前桌面显示内容
- 识别鼠标指向窗口。控件或图标保存为图片
本章主要实现滑动鼠标截取当前桌面显示内容这种方式，侧重讲解大体实现，具体功能见代码
功能考虑
- 改功能的实现主要分为三大部分：滑动鼠标截取桌面图片、截图辅助功能、截取部分二次处理。
滑动鼠标截取当前桌面显示内容
滑动鼠标截取桌面图片
- 获取当前桌面显示内容为图片，此后的所有操作都是围绕这个图片进行。
QPixmap show_top_pixmap_ ;
show_top_pixmap_ = QPixmap::grabWindow(QApplication::desktop()->winId); //当前桌面显示内容
- 使用画笔将桌面图片绘制到widget上，全屏显示，并绘制阴影，截取操作实际上是在该widget对象上进行，但此时效果看起来就像在原桌面上操作。
//窗口设置
this->setWindowModality(Qt::WindowModal); //设置窗口模态类型：半模态,窗口级模态对话框，阻塞父窗口、父窗口的父窗口及兄弟窗口。
this->setWindowFlag(Qt::WindowContextHelpButtonHint, false); //一次上下文帮助按钮
this->setWindowState(Qt::WindowActive | Qt::WindowFullScreen); //全屏显示//阴影色效果绘制
Qpainter *_painter;
QColor shadow_color = QColor(0, 0, 0, 100); //阴影色
_painter->setPen(QPen(Qt::white, 1, Qt::SolidLine, Qt::FlatCap)); //设置画笔
_painter->drawPixmap(0, 0, show_top_pixmap_ ); //将桌面图片绘制到窗体上
_painter->fillRect(show_top_pixmap_ .rect(), shadow_color ); //绘制阴影色效果
- 鼠标按下为起始位置p1，鼠标释放为结束位置p2，以p1，p2两点绘制矩形，矩形所在区域则为截屏区域。考虑到美化可以将矩形边框去掉，在矩形八个位置绘制圆形，以便之后的截屏区域二次调整。
实现上述功能需要重写的函数：
virtual void mousePressEvent(QMouseEvent *event); //鼠标按下
virtual void mouseReleaseEvent(QMouseEvent *event); //鼠标移动
virtual void mouseMoveEvent(QMouseEvent *event); //鼠标释放
virtual void paintEvent(QPaintEvent *event); //画笔绘制
- 裁剪矩形绘制
//通过上述函数获取鼠标起始位置
Qpoint mouse_slid_begin_point_, mouse_slid_end_point_; //截取图片：滑动鼠标起始位置
Qpixmap pixmap_; //截屏结果图片
QRect selected_rect = GetRect(mouse_slid_begin_point, mouse_slid_end_point_); //根据两点计算矩形大小
_painter->drawPixmap(selected_rect .topLeft(), pixmap_); //绘制矩形区域内裁剪图片
pixmap_对象中存放的内容就是需要保存的图片，这样基本的截图功能就已经实现。
截图辅助功能
- 截图工具的辅助功能暂时先不考虑对图片本身进行二次操作（例如：自定义画笔，箭头，马赛克等），优先考虑将这个图片的参数信息显示，具备一些基本操作等。暂时考虑添加的信息显示：裁剪区域大小，十字形辅助线，锚点（图片局部放大显示），像素点颜色，当前鼠标位置，提示信息。
- 裁剪区域大小，十字形辅助线，当前鼠标位置，提示信息 这类信息就是计算好要显示的位置，然后将信息绘制到上面即可，具体实现这里不加赘述。
- 锚点功能。这里取17X11的图片，然后放大十倍进行显示。获取鼠标当前位置p3,以p3为中心截取17X11区域内图片，将图片放大后绘制在大小为170X110的矩形内。十字形锚点，简单来说为两个大小为170X10，10X110的蓝色透明矩形垂直交叉绘制，交叉部分绘制一个大小为10X10填充色为当前鼠标指向色的矩形。
//*******************信息框--图片区****************//矩形：图片框QRect rect_infomation_pixmap_rect(information_x, information_y, 170, 110);//放大图片处理QRect rect_information_pixmap(mouse_now_point_.x() - 8, mouse_now_point_.y() - 5, 17, 11);QPixmap information_pixmap_ = show_top_pixmap_.copy(rect_information_pixmap).scaled(170, 110, Qt::KeepAspectRatioByExpanding);_painter->drawPixmap(rect_infomation_pixmap_rect.topLeft(), information_pixmap_);//中央辅助线绘制QColor information_pixmap_color = QColor(0, 0, 255, 150);QRect information_pixmap_x(information_x, information_y + 50, 170, 10);QRect information_pixmap_y(information_x + 80, information_y, 10, 110);_painter->fillRect(information_pixmap_x, information_pixmap_color);_painter->fillRect(information_pixmap_y, information_pixmap_color);QRect information_pixmap_f(information_x + 80, information_y + 50, 10, 10);_painter->setBrush(QColor(rgb_color));_painter->drawRect(information_pixmap_f);_painter->setBrush(Qt::NoBrush);_painter->drawRect(rect_infomation_pixmap_rect);
- 像素点颜色。当前屏幕图片为全屏显示，所以鼠标的相对位置（event->pos()）就是当前指向像素点的位置，由此获取像素点颜色。
//获取图片固定位置颜色
QRgb GetPixmapColor(QPixmap _pixmap, QPoint _position);QRgb CustomSlidScreenCapture::GetPixmapColor(QPixmap _pixmap, QPoint _position)
{QImage image_ = _pixmap.toImage();//获取一行像素点颜色QRgb *line_rgb = (QRgb *)image_.scanLine(_position.y());//取对应像素点颜色return line_rgb[_position.x()];
}
- 像素点颜色转化为文本信息
QRgb rgb_color = GetPixmapColor(show_top_pixmap_, mouse_now_point_);
QString text_information_color = "(" + QString::number(qRed(rgb_color)) + " ," + QString::number(qGreen(rgb_color)) + " ," + QString::number(qBlue(rgb_color)) + ")";
截取部分二次处理
在获取截取区域矩形后，需要对当前矩形进行微调，调整分为八个方向：上、下、左、右、左上、左下、右上、右下，在判断当前鼠标所处矩形位置后，记录鼠标按下与释放的位置p4、p5,根据这两点计算出鼠标移动的距离，然后对绘制的矩形区域进行调整。除却调整矩形大小之外，矩形还应该可以拖动，实现方式与上面大同小异。对于截取部分的二次处理，主要是对数据的处理，没有太大的难度，这里不在多加赘述。
- 设置鼠标的不同样式
this->setCursor(Qt::ArrowCursor);
- 鼠标样式枚举枚举
| 枚举值 | 含义 |
|---|---|
| Qt::ArrowCursor | 数表常态 |
| Qt::SizeVerCursor | 垂直上下箭头 |
| Qt::SizeAllCursor | 全方向箭头 |
| Qt::SizeHorCursor | 水平左右箭头 |
| Qt::SizeBDiagCursor | 斜左下右上箭头 |
| Qt::SizeFDiagCursor | 斜左上右下箭头 |
代码实现
至此，滑动鼠标截取当前桌面显示内容功能已大致完成，代码具体实现如下：
- custom_slid_screen_capture.h
#pragma once
#include <QDialog>
#include <QObject>
#include <QWidget>
#include <QPixmap>
#include <QImage>
#include <QPoint>
#include <QPainter>
#include <QApplication>
#include <QDesktopWidget>
#include <QStandardPaths>
#include <QKeyEvent>
#include <QMenu>
#include <QClipboard>
#include <QtGui//QWindow>
#include <QDebug>
#include <QtGui/QScreen>
#include <QFileDialog>
#include <Windows.h>
#include <vector>enum ArrowType
{Arrow_Cursor,Size_Ver_Cursor_Top,Size_Ver_Cursor_Bottom,Size_Hor_Cursor_Left,Size_Hor_Cursor_Right,Size_All_Cursor,Size_Bdiag_Cursor_Top,Size_Bdiag_Cursor_Bottom,Size_Fdiag_Cursor_Top,Size_Fdiag_Cursor_Bottom
};class CustomSlidScreenCapture:public QDialog
{Q_OBJECT
public:CustomSlidScreenCapture();~CustomSlidScreenCapture();public:void ScreenCapture();private:QPixmap show_top_pixmap_; //当前桌面显示内容QPixmap pixmap_; //当前图片QString pixel_color_; //当前像素颜色QPoint mouse_slid_begin_point_, mouse_slid_end_point_; //截取图片：滑动鼠标起始位置QPoint mouse_now_point_; //鼠标当前位置bool mouse_slid_press_flag_; //截取图片：鼠标是否按下bool mouse_slid_finish_; //截取图片：截屏区域是否选择完毕QPoint mouse_rect_begin_point_, mouse_rect_end_point_; //调整截屏区域：滑动鼠标起始位置bool mouse_rect_press_flag_; //调整截屏区域：鼠标是否按下QPoint mouse_result_begin_point_, mouse_result_end_point_; //调整结果：图片起始位置private:/*******************画笔绘制相关********************///绘制整体背景图片void DrawBackgroundPixmap(QPainter *_painter);//绘制滑动矩形框void DrawSlidRect(QPainter *_painter);//绘制辅助线void DrawBoostLine(QPainter *_painter);//绘制信息框void DrawInformationRect(QPainter *_painter);//绘制结果矩形框--大小重绘void DrawFruitRect(QPainter *_painter);//绘制结果矩形框--样式void DrawFruitRectStyle(QPainter *_painter, QPoint& _begion_point, QPoint& _end_point);//绘制结果矩形框相关判断显示void DrawFruitRectIsShow(QPainter *_painter);//获取要绘制的矩形QRect GetRect(const QPoint& _begin_Point, const QPoint& _end_Point);//获取图片固定位置颜色QRgb GetPixmapColor(QPixmap _pixmap, QPoint _position);//获取起始点的偏移QPoint GetOffsetPoint(const QPoint& _begin_Point, const QPoint& _end_Point);//判断点是否在该矩形内ArrowType PointInRect(QPoint& _point, QRect _rect);//保存图片void Save();//返回当前截图对象QPixmap GetScreenPixmap();protected:virtual void mousePressEvent(QMouseEvent *event);virtual void mouseReleaseEvent(QMouseEvent *event);virtual void mouseMoveEvent(QMouseEvent *event);virtual void paintEvent(QPaintEvent *event);virtual void keyReleaseEvent(QKeyEvent *event);};
- custom_slid_screen_capture.cpp
#include "custom_slid_screen_capture.h"std::vector<QRect> allWindowRect;
std::vector<HWND> allWindowHwnd;
std::vector<MyRect> myRectRestlt;bool CALLBACK MyEnumWindowsProc(HWND _hwnd, LPARAM _lparam);CustomSlidScreenCapture::CustomSlidScreenCapture(): mouse_slid_press_flag_(false), mouse_slid_finish_(false), mouse_rect_press_flag_(false), pixel_color_("(0,0,0)")
{this->setWindowModality(Qt::WindowModal);this->setWindowFlag(Qt::WindowContextHelpButtonHint, false);this->setWindowState(Qt::WindowActive | Qt::WindowFullScreen);//默认鼠标移动进入鼠标移动响应函数this->setMouseTracking(true);::EnumWindows((WNDENUMPROC)MyEnumWindowsProc, 0);
}CustomSlidScreenCapture::~CustomSlidScreenCapture()
{}void CustomSlidScreenCapture::ScreenCapture()
{show_top_pixmap_ = QPixmap::grabWindow(QApplication::desktop()->winId());
}QRect CustomSlidScreenCapture::GetRect(const QPoint& _begin_Point, const QPoint& _end_Point)
{int x, y, width, height;width = qAbs(_begin_Point.x() - _end_Point.x());height = qAbs(_begin_Point.y() - _end_Point.y());x = _begin_Point.x() < _end_Point.x() ? _begin_Point.x() : _end_Point.x();y = _begin_Point.y() < _end_Point.y() ? _begin_Point.y() : _end_Point.y();QRect selected_rect = QRect(x, y, width, height); //QRect类代表一个矩形区域if (selected_rect.width() == 0){selected_rect.setWidth(1);}if (selected_rect.height() == 0){selected_rect.setHeight(1);}return selected_rect;
}QRgb CustomSlidScreenCapture::GetPixmapColor(QPixmap _pixmap, QPoint _position)
{QImage image_ = _pixmap.toImage();QRgb *line_rgb = (QRgb *)image_.scanLine(_position.y());return line_rgb[_position.x()];
}QPoint CustomSlidScreenCapture::GetOffsetPoint(const QPoint& _begin_Point, const QPoint& _end_Point)
{return QPoint(_end_Point.x() - _begin_Point.x(), _end_Point.y() - _begin_Point.y());
}ArrowType CustomSlidScreenCapture::PointInRect(QPoint& _point, QRect _rect)
{int x1 = _rect.topLeft().x();int y1 = _rect.topLeft().y();int x2 = _rect.bottomRight().x();int y2 = _rect.bottomRight().y();int range_size = (_rect.width() ? _rect.height() : _rect.width()>_rect.height())/3;//全if (_point.x() >= x1 + range_size && _point.x() <= x2 - range_size && _point.y() >= y1 + range_size && _point.y() <= y2 - range_size)return Size_All_Cursor;//水平-左if (_point.x() >= x1 - 100 && _point.x() <= x1 + range_size && _point.y() >= y1 + range_size && _point.y() <= y2 - range_size)return Size_Hor_Cursor_Left;//水平-右if (_point.x() >= x2 - range_size && _point.x() <= x2 + 100 && _point.y() >= y1 + range_size && _point.y() <= y2 - range_size)return Size_Hor_Cursor_Right;//垂直-上if (_point.x() >= x1 + range_size && _point.x() <= x2 - range_size && _point.y() >= y1 - 100 && _point.y() <= y1 + range_size)return Size_Ver_Cursor_Top;//垂直-下if (_point.x() >= x1 + range_size && _point.x() <= x2 - range_size && _point.y() >= y2 - range_size && _point.y() <= y2 + 100)return Size_Ver_Cursor_Bottom;//斜下-上if (_point.x() >= x1 - 100 && _point.x() <= x1 + range_size && _point.y() >= y1 - 100 && _point.y() <= y1 + range_size)return Size_Fdiag_Cursor_Top;//斜下-下if (_point.x() >= x2 - range_size && _point.x() <= x2 + 100 && _point.y() >= y2 - range_size && _point.y() <= y2 + 100)return Size_Fdiag_Cursor_Bottom;//斜上-上if (_point.x() >= x2 - range_size && _point.x() <= x2 + 100 && _point.y() >= y1 - 100 && _point.y() <= y1 + range_size)return Size_Bdiag_Cursor_Top;//斜上-下if (_point.x() >= x1 - 100 && _point.x() <= x1 + range_size && _point.y() >= y2 - range_size && _point.y() <= y2 + 100)return Size_Bdiag_Cursor_Bottom;return Arrow_Cursor;
}void CustomSlidScreenCapture::CalculataRectDistance(QRect rect)
{int dis = rect.width() + rect.height();MyRect temp_myrect;temp_myrect.myRect_ = rect;temp_myrect.distance_ = dis;myRectRestlt.push_back(temp_myrect);
}void CustomSlidScreenCapture::Save()
{QString file_name = QFileDialog::getSaveFileName(this, QStringLiteral("截图文件保存"), "picture1.jpg", tr("Images(*.png,*.bmp,*.jpg)"));pixmap_.save(file_name);
}QPixmap CustomSlidScreenCapture::GetScreenPixmap()
{return pixmap_;
}void CustomSlidScreenCapture::mousePressEvent(QMouseEvent *event)
{//滑动获取截屏区域if (event->button() == Qt::LeftButton&&!mouse_slid_finish_){mouse_slid_press_flag_ = true;mouse_slid_begin_point_ = event->pos();}//拖动截屏区域if (event->button() == Qt::LeftButton&&!mouse_rect_press_flag_&&mouse_slid_finish_&&PointInRect(mouse_now_point_, GetRect(mouse_slid_begin_point_, mouse_slid_end_point_))!=Arrow_Cursor){mouse_rect_press_flag_ = true;mouse_rect_begin_point_ = event->pos();mouse_rect_end_point_ = event->pos();mouse_result_begin_point_ = mouse_slid_begin_point_;mouse_result_end_point_ = mouse_slid_end_point_;}
#if 0//点击截取屏幕if (event->button() == Qt::LeftButton&&!mouse_rect_press_flag_&&mouse_slid_finish_&&PointInRect(mouse_now_point_, GetRect(mouse_slid_begin_point_, mouse_slid_end_point_)) != Arrow_Cursor){mouse_rect_end_point_ = event->pos();mouse_rect_press_flag_ = false;mouse_slid_begin_point_ = mouse_result_begin_point_;mouse_slid_end_point_ = mouse_result_end_point_;}
#endifupdate();return QWidget::mousePressEvent(event);
}void CustomSlidScreenCapture::mouseReleaseEvent(QMouseEvent *event)
{//滑动获取截屏区域if (mouse_slid_press_flag_){mouse_slid_end_point_ = event->pos();mouse_slid_press_flag_ = false;mouse_slid_finish_ = true;mouse_result_begin_point_ = mouse_slid_begin_point_;mouse_result_end_point_ = mouse_slid_end_point_;}//拖动截屏区域if (mouse_rect_press_flag_){mouse_rect_end_point_ = event->pos();mouse_rect_press_flag_ = false;/*QRect rect_f = GetRect(mouse_result_begin_point_, mouse_result_end_point_);mouse_slid_begin_point_ = rect_f.topLeft();mouse_slid_end_point_ = rect_f.bottomRight();*/mouse_slid_begin_point_ = mouse_result_begin_point_;mouse_slid_end_point_ = mouse_result_end_point_;}update();return QWidget::mouseReleaseEvent(event);
}void CustomSlidScreenCapture::mouseMoveEvent(QMouseEvent *event)
{mouse_now_point_ = event->pos();//滑动获取截屏区域if (mouse_slid_press_flag_){mouse_slid_end_point_ = event->pos(); }//拖动截屏区域if (mouse_rect_press_flag_){mouse_rect_end_point_ = event->pos();}//调用该函数时会调用paintEvent函数update(); return QWidget::mouseMoveEvent(event);
}void CustomSlidScreenCapture::keyReleaseEvent(QKeyEvent *event)
{//退出if (event->key() == Qt::Key_Escape){close();}//保存颜色if (event->key() == Qt::Key_C){QApplication::clipboard()->setText(pixel_color_);}//复制内容到剪切板if (event->matches(QKeySequence::Copy)){QApplication::clipboard()->setPixmap(pixmap_);}//重置if (event->key() == Qt::Key_Enter){mouse_slid_press_flag_ = false;mouse_slid_finish_ = false;}//保存图片if (event->matches(QKeySequence::Save)){Save();mouse_slid_press_flag_ = false;mouse_slid_finish_ = false;}update();
}void CustomSlidScreenCapture::DrawBackgroundPixmap(QPainter *_painter)
{QColor shadowColor = QColor(0, 0, 0, 100); //阴影色_painter->setPen(QPen(Qt::white, 1, Qt::SolidLine, Qt::FlatCap)); //设置画笔_painter->drawPixmap(0, 0, show_top_pixmap_); //将获取的图片画到窗体上_painter->fillRect(show_top_pixmap_.rect(), shadowColor); //画影罩效果
}void CustomSlidScreenCapture::DrawSlidRect(QPainter *_painter)
{//绘制截取区域QRect selected_rect = GetRect(mouse_slid_begin_point_, mouse_slid_end_point_);pixmap_ = show_top_pixmap_.copy(selected_rect);_painter->drawPixmap(selected_rect.topLeft(), pixmap_);DrawFruitRectStyle(_painter, mouse_slid_begin_point_, mouse_slid_end_point_);//截取区域大小信息QString pixmap_size = QString::number(selected_rect.width()) + " X " + QString::number(selected_rect.height());QColor information_color = QColor(0, 0, 0, 150);QFontMetrics fm(_painter->font());QRect fm_rect = fm.boundingRect(pixmap_size);QRect pixmap_size_rect(selected_rect.topLeft().x(), selected_rect.topLeft().y() -20, fm_rect.width() + 5, 20);_painter->fillRect(pixmap_size_rect, information_color);_painter->drawText(pixmap_size_rect,Qt::AlignCenter, pixmap_size);
}void CustomSlidScreenCapture::DrawBoostLine(QPainter *_painter)
{//绘制辅助线QLine line_boost_x(QPoint(0, mouse_slid_end_point_.y()), QPoint(show_top_pixmap_.width(), mouse_slid_end_point_.y()));QLine line_boost_y(QPoint(mouse_slid_end_point_.x(), 0), QPoint(mouse_slid_end_point_.x(), show_top_pixmap_.height()));_painter->drawLine(line_boost_x);_painter->drawLine(line_boost_y);
}void CustomSlidScreenCapture::DrawInformationRect(QPainter *_painter)
{//绘制辅助信息框位置int information_x = mouse_now_point_.x() +50;int information_y = mouse_now_point_.y() +50;//*******************信息框--整体****************QRect rect_infomation(information_x, information_y, 170, 170);//整体颜色基调QColor information_color = QColor(0, 0, 0, 150);_painter->fillRect(rect_infomation, information_color);//*******************信息框--文本内容****************//文本：位置信息QRect rect_infomation_position(information_x, information_y + 110, 170, 20);QString text_information_position = "(" + QString::number(mouse_now_point_.x()) + "," + QString::number(mouse_now_point_.y()) + ")";_painter->drawText(rect_infomation_position, Qt::AlignCenter, text_information_position);//文本：颜色信息QRect rect_infomation_color(information_x, information_y + 130, 170, 20);//颜色显示小框QRect rect_infomation_color_f(information_x + 5, information_y + 135, 10, 10);QRgb rgb_color = GetPixmapColor(show_top_pixmap_, mouse_now_point_);QString text_information_color = "(" + QString::number(qRed(rgb_color)) + " ," + QString::number(qGreen(rgb_color)) + " ," + QString::number(qBlue(rgb_color)) + ")";pixel_color_ = text_information_color;_painter->drawText(rect_infomation_color, Qt::AlignCenter, text_information_color);_painter->setBrush(QColor(rgb_color));_painter->drawRect(rect_infomation_color_f);_painter->setBrush(Qt::NoBrush);//文本：提示信息QRect rect_infomation_text(information_x, information_y + 150, 170, 20);QString text_information_text = QStringLiteral("按C复制颜色值");_painter->drawText(rect_infomation_text, Qt::AlignCenter, text_information_text);//*******************信息框--图片区****************//图片框QRect rect_infomation_pixmap_rect(information_x, information_y, 170, 110);//放大图片QRect rect_information_pixmap(mouse_now_point_.x() - 8, mouse_now_point_.y() - 5, 17, 11);QPixmap information_pixmap_ = show_top_pixmap_.copy(rect_information_pixmap).scaled(170, 110, Qt::KeepAspectRatioByExpanding);_painter->drawPixmap(rect_infomation_pixmap_rect.topLeft(), information_pixmap_);//中央辅助线QColor information_pixmap_color = QColor(0, 0, 255, 150);QRect information_pixmap_x(information_x, information_y + 50, 170, 10);QRect information_pixmap_y(information_x + 80, information_y, 10, 110);_painter->fillRect(information_pixmap_x, information_pixmap_color);_painter->fillRect(information_pixmap_y, information_pixmap_color);QRect information_pixmap_f(information_x + 80, information_y + 50, 10, 10);_painter->setBrush(QColor(rgb_color));_painter->drawRect(information_pixmap_f);_painter->setBrush(Qt::NoBrush);_painter->drawRect(rect_infomation_pixmap_rect);
}void CustomSlidScreenCapture::DrawFruitRect(QPainter *_painter)
{//绘制结果矩形框//计算偏移if (mouse_rect_press_flag_){QRect rect_f = GetRect(mouse_slid_begin_point_, mouse_slid_begin_point_);QPoint rect_f_begin = rect_f.topLeft();QPoint rect_f_end = rect_f.bottomRight();ArrowType flag = PointInRect(mouse_now_point_, GetRect(mouse_result_begin_point_, mouse_result_end_point_));int offset_x = GetOffsetPoint(mouse_rect_begin_point_, mouse_rect_end_point_).x();int offset_y = GetOffsetPoint(mouse_rect_begin_point_, mouse_rect_end_point_).y();switch (flag){case Arrow_Cursor:break;case Size_Ver_Cursor_Top:mouse_result_begin_point_ = QPoint(mouse_slid_begin_point_.x(), mouse_slid_begin_point_.y() + offset_y);mouse_result_end_point_ = QPoint(mouse_slid_end_point_.x(), mouse_slid_end_point_.y());break;case Size_Ver_Cursor_Bottom:mouse_result_begin_point_ = QPoint(mouse_slid_begin_point_.x(), mouse_slid_begin_point_.y());mouse_result_end_point_ = QPoint(mouse_slid_end_point_.x(), mouse_slid_end_point_.y() + offset_y);break;case Size_Hor_Cursor_Left:mouse_result_begin_point_ = QPoint(mouse_slid_begin_point_.x() + offset_x, mouse_slid_begin_point_.y());mouse_result_end_point_ = QPoint(mouse_slid_end_point_.x(), mouse_slid_end_point_.y() + offset_y);break;case Size_Hor_Cursor_Right:mouse_result_begin_point_ = QPoint(mouse_slid_begin_point_.x(), mouse_slid_begin_point_.y());mouse_result_end_point_ = QPoint(mouse_slid_end_point_.x() + offset_x, mouse_slid_end_point_.y());break;case Size_All_Cursor:mouse_result_begin_point_ = QPoint(mouse_slid_begin_point_.x() + offset_x, mouse_slid_begin_point_.y() + offset_y);mouse_result_end_point_ = QPoint(mouse_slid_end_point_.x() + offset_x, mouse_slid_end_point_.y() + offset_y);break;case Size_Bdiag_Cursor_Top:mouse_result_begin_point_ = QPoint(mouse_slid_begin_point_.x(), mouse_slid_begin_point_.y() + offset_y);mouse_result_end_point_ = QPoint(mouse_slid_end_point_.x() + offset_x, mouse_slid_end_point_.y());break;case Size_Bdiag_Cursor_Bottom:mouse_result_begin_point_ = QPoint(mouse_slid_begin_point_.x() + offset_x, mouse_slid_begin_point_.y());mouse_result_end_point_ = QPoint(mouse_slid_end_point_.x(), mouse_slid_end_point_.y() + offset_y);break;case Size_Fdiag_Cursor_Top:mouse_result_begin_point_ = QPoint(mouse_slid_begin_point_.x() + offset_x, mouse_slid_begin_point_.y() + offset_y);mouse_result_end_point_ = QPoint(mouse_slid_end_point_.x(), mouse_slid_end_point_.y());break;case Size_Fdiag_Cursor_Bottom:mouse_result_begin_point_ = QPoint(mouse_slid_begin_point_.x(), mouse_slid_begin_point_.y());mouse_result_end_point_ = QPoint(mouse_slid_end_point_.x() + offset_x, mouse_slid_end_point_.y() + offset_y);break;default:break;}}//绘制截取区域QRect selected_rect = GetRect(mouse_result_begin_point_, mouse_result_end_point_);pixmap_ = show_top_pixmap_.copy(selected_rect);_painter->drawPixmap(selected_rect.topLeft(), pixmap_);DrawFruitRectStyle(_painter, mouse_result_begin_point_, mouse_result_end_point_);//截取区域大小信息QString pixmap_size = QString::number(selected_rect.width()) + " X " + QString::number(selected_rect.height());QColor information_color = QColor(0, 0, 0, 150);QFontMetrics fm(_painter->font());QRect fm_rect = fm.boundingRect(pixmap_size);QRect pixmap_size_rect(selected_rect.topLeft().x(), selected_rect.topLeft().y() -20, fm_rect.width() + 5, 20);_painter->fillRect(pixmap_size_rect, information_color);_painter->drawText(pixmap_size_rect, Qt::AlignCenter, pixmap_size);}void CustomSlidScreenCapture::DrawFruitRectStyle(QPainter *_painter, QPoint& _begion_point, QPoint& _end_point)
{int radius_roll = 4;int x1 = _begion_point.x();int y1 = _begion_point.y();int x2 = _end_point.x();int y2 = _end_point.y();QVector<QPoint> points;points.push_back(QPoint(x1, y1));points.push_back(QPoint((x1 + x2) / 2, y1));points.push_back(QPoint(x2, y1));points.push_back(QPoint(x2, (y1 + y2) / 2));points.push_back(QPoint(x2, y2));points.push_back(QPoint((x1 + x2) / 2, y2));points.push_back(QPoint(x1, y2));points.push_back(QPoint(x1, (y1 + y2) / 2));_painter->setBrush(Qt::blue);for (int i = 0; i < 8; i++){_painter->drawEllipse(points.at(i),radius_roll,radius_roll);}}void CustomSlidScreenCapture::DrawFruitRectIsShow(QPainter *_painter)
{ArrowType flag = PointInRect(mouse_now_point_, GetRect(mouse_result_begin_point_, mouse_result_end_point_));switch (flag){case Arrow_Cursor:this->setCursor(Qt::ArrowCursor);break;case Size_Ver_Cursor_Top:this->setCursor(Qt::SizeVerCursor);break;case Size_Ver_Cursor_Bottom:this->setCursor(Qt::SizeVerCursor);break;case Size_Hor_Cursor_Left:this->setCursor(Qt::SizeHorCursor);break;case Size_Hor_Cursor_Right:this->setCursor(Qt::SizeHorCursor);break;case Size_All_Cursor:this->setCursor(Qt::SizeAllCursor);break;case Size_Bdiag_Cursor_Top:this->setCursor(Qt::SizeBDiagCursor);break;case Size_Bdiag_Cursor_Bottom:this->setCursor(Qt::SizeBDiagCursor);break;case Size_Fdiag_Cursor_Top:this->setCursor(Qt::SizeFDiagCursor);break;case Size_Fdiag_Cursor_Bottom:this->setCursor(Qt::SizeFDiagCursor);break;default:break;}if (flag&&!mouse_rect_press_flag_)DrawInformationRect(_painter); //绘制信息框
}void CustomSlidScreenCapture::paintEvent(QPaintEvent *event)
{QPainter *painter = new QPainter(this);painter->save();DrawBackgroundPixmap(painter); //绘制整体背景图片//滑动截取图片if (mouse_slid_press_flag_){DrawBoostLine(painter); //绘制辅助线DrawSlidRect(painter); //绘制滑动矩形框DrawInformationRect(painter); //绘制信息框}//截取图片二次处理if (mouse_slid_finish_){DrawFruitRect(painter); //绘制结果矩形框--大小重绘DrawFruitRectIsShow(painter); //绘制结果矩形框相关判断显示}if (!mouse_slid_finish_){DrawFruitRect(painter); //绘制结果矩形框--大小重绘//DrawFruitRectIsShow(painter); //绘制结果矩形框相关判断显示}painter->restore();
}
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