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
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
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
std::vector
std::vector
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_;
}
#endif
update();
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
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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