qt+opencv实现头像剪裁

#include "OEScreen.h" #include <QMouseEvent> #include <QPainter> OEScreen::OEScreen(QWidget *parent) : QWidget(parent), direction_(NONE), isPressed_(false), scaleFactor(1), scaleMode(1) { menu_ = new QMenu(this); menu_->addAction(QStringLiteral("完成"), this, SLOT(onSaveScreen())); menu_->addSeparator(); menu_->addAction(QStringLiteral("退出"), this, SLOT(quitScreenshot())); /// 开启鼠标实时追踪 setMouseTracking(true); scaleFactor = (float)358/441; } OEScreen::DIRECTION OEScreen::getRegion(const QPoint &cursor) { OEScreen::DIRECTION ret_dir = NONE; // left upper QPoint pt_lu = mapToParent(rect().topLeft()); // right lower QPoint pt_rl = mapToParent(rect().bottomRight()); int x = cursor.x(); int y = cursor.y(); /// 获得鼠标当前所处窗口的边界方向 if(pt_lu.x() + PADDING_ >= x && pt_lu.x() <= x && pt_lu.y() + PADDING_ >= y && pt_lu.y() <= y) { // 左上角 ret_dir = LEFTUPPER; this->setCursor(QCursor(Qt::SizeFDiagCursor)); } else if(x >= pt_rl.x() - PADDING_ && x <= pt_rl.x() && y >= pt_rl.y() - PADDING_ && y <= pt_rl.y()) { // 右下角 ret_dir = RIGHTLOWER; this->setCursor(QCursor(Qt::SizeFDiagCursor)); } else if(x <= pt_lu.x() + PADDING_ && x >= pt_lu.x() && y >= pt_rl.y() - PADDING_ && y <= pt_rl.y()) { // 左下角 ret_dir = LEFTLOWER; this->setCursor(QCursor(Qt::SizeBDiagCursor)); } else if(x <= pt_rl.x() && x >= pt_rl.x() - PADDING_ && y >= pt_lu.y() && y <= pt_lu.y() + PADDING_) { // 右上角 ret_dir = RIGHTUPPER; this->setCursor(QCursor(Qt::SizeBDiagCursor)); } else if(x <= pt_lu.x() + PADDING_ && x >= pt_lu.x()) { // 左边 ret_dir = LEFT; this->setCursor(QCursor(Qt::SizeHorCursor)); } else if( x <= pt_rl.x() && x >= pt_rl.x() - PADDING_) { // 右边 ret_dir = RIGHT; this->setCursor(QCursor(Qt::SizeHorCursor)); }else if(y >= pt_lu.y() && y <= pt_lu.y() + PADDING_){ // 上边 ret_dir = UPPER; this->setCursor(QCursor(Qt::SizeVerCursor)); } else if(y <= pt_rl.y() && y >= pt_rl.y() - PADDING_) { // 下边 ret_dir = LOWER; this->setCursor(QCursor(Qt::SizeVerCursor)); }else { // 默认 ret_dir = NONE; this->setCursor(QCursor(Qt::SizeAllCursor)); } return ret_dir; } void OEScreen::contextMenuEvent(QContextMenuEvent *) { /// 在鼠标位置弹射出菜单栏 menu_->exec(cursor().pos()); } void OEScreen::mouseDoubleClickEvent(QMouseEvent *e) { if (e->button() == Qt::LeftButton) { emit doubleClick(); e->accept(); } } void OEScreen::mousePressEvent(QMouseEvent *e) { if (e->button() == Qt::LeftButton) { isPressed_ = true; if(direction_ != NONE) { this->mouseGrabber(); } /// @bug :这里可能存在问题, 不应当使用globalPos movePos_ = e->globalPos() - pos(); } } void OEScreen::mouseReleaseEvent(QMouseEvent * e) { if (e->button() == Qt::LeftButton) { isPressed_ = false; if(direction_ != NONE) { setCursor(QCursor(Qt::SizeAllCursor)); } } } void OEScreen::mouseMoveEvent(QMouseEvent * e) { QPoint gloPoint = mapToParent(e->pos()); // left upper QPoint pt_lu = mapToParent(rect().topLeft()); // left lower QPoint pt_ll = mapToParent(rect().bottomLeft()); // right lower QPoint pt_rl = mapToParent(rect().bottomRight()); // right upper QPoint pt_ru = mapToParent(rect().topRight()); if(!isPressed_) { /// 检查鼠标鼠标方向 direction_ = getRegion(gloPoint); /// 根据方位判断拖拉对应支点 switch(direction_) { case NONE: case RIGHT: case RIGHTLOWER: originPoint_ = pt_lu; break; case RIGHTUPPER: originPoint_ = pt_ll; break; case LEFT: case LEFTLOWER: originPoint_ = pt_ru; break; case LEFTUPPER: case UPPER: originPoint_ = pt_rl; break; case LOWER: originPoint_ = pt_lu; break; } } else { if(direction_ != NONE) { const int& global_x = gloPoint.x(); /// 鼠标进行拖拉拽 switch(direction_) { case LEFT: return onMouseChange(global_x, pt_ll.y() + 1, CS_WIDTH); case RIGHT: return onMouseChange(global_x, pt_rl.y() + 1, CS_WIDTH); case UPPER: return onMouseChange(pt_lu.x(), gloPoint.y(), CS_HEIGHT); case LOWER: return onMouseChange(pt_rl.x() + 1, gloPoint.y(), CS_HEIGHT); case LEFTUPPER: case RIGHTUPPER: case LEFTLOWER: case RIGHTLOWER: return onMouseChange(global_x, gloPoint.y(), CS_HEIGHT); default: break; } } else { /// 窗口的移动 QPoint p; p = e->globalPos() - movePos_; limitPos(p); move(p); movePos_ = e->globalPos() - pos(); } } currentRect_ = geometry(); } void OEScreen::moveCenter(int cx, int cy) { QPoint p; p.setX(cx - width()/2); p.setY(cy - height()/2); limitPos(p); move(p); } void OEScreen::limitPos(QPoint &p) { int ph, pw; QPoint prl; ph = parentWidget()->height(); pw = parentWidget()->width(); if (p.x() < 0) p.setX(0); if (p.y() < 0) p.setY(0); prl.setX(p.x() + width()); prl.setY(p.y() + height()); if (prl.y() > ph) p.setY(ph - height()); if (prl.x() > pw) p.setX(pw - width()); } void OEScreen::setScaleFactor(int w, int h) { scaleFactor = (float)w/h; scaleMode = 1; } void OEScreen::moveEvent(QMoveEvent *) { emit postionChange(x(), y()); } void OEScreen::resizeEvent(QResizeEvent *) { listMarker_.clear(); /// 重新计算八个锚点 // 角点 listMarker_.push_back(QPoint(0, 0)); listMarker_.push_back(QPoint(width(), 0)); listMarker_.push_back(QPoint(0, height())); listMarker_.push_back(QPoint(width(), height())); // 中点 listMarker_.push_back(QPoint((width() >> 1), 0)); listMarker_.push_back(QPoint((width() >> 1), height())); listMarker_.push_back(QPoint(0, (height() >> 1))); listMarker_.push_back(QPoint(width(), (height() >> 1))); emit sizeChange(width(), height()); } void OEScreen::hideEvent(QHideEvent *) { currentRect_ = {}; movePos_ = {}; originPoint_ = {}; } void OEScreen::enterEvent(QEvent *e) { setCursor(Qt::SizeAllCursor); QWidget::enterEvent(e); } void OEScreen::leaveEvent(QEvent *e) { setCursor(Qt::ArrowCursor); QWidget::leaveEvent(e); } void OEScreen::paintEvent(QPaintEvent *) { QPainter painter(this); /// 绘制边框线 QPen pen(QColor(0,174,255),6); painter.setPen(pen); painter.drawRect(rect()); /// 绘制八个点 //改变点的宽度 pen.setWidth(12); pen.setColor(Qt::red); painter.setPen(pen); painter.drawPoints(listMarker_); } void OEScreen::onSaveScreenOther(void) { QString fileName; if (fileName.length() > 0) { origin