使用Qt实现绘图工具，包括绘制自由曲线，矩形，多边形等工具

#include "DisplayWgt.h" #include <QPainter> #include <QMouseEvent> DisplayWgt::DisplayWgt(QWidget *parent) : QWidget(parent) { ui.setupUi(this); m_shape = NoShape; m_state = NormalState; m_rectId = 0; m_circleId = 0; m_ellipseId = 0; m_polygonId = 0; m_bll = BllData::getInstance(); connect(m_bll, &BllData::updateImgDataSignal, this, &DisplayWgt::updateImgDataSlot); connect(m_bll, &BllData::setDeleteStateEnableSignal, this, &DisplayWgt::setDeleteStateEnableSlot); connect(m_bll, &BllData::setToolsShapeSignal, this, &DisplayWgt::setToolsShapeSlot); connect(m_bll, &BllData::clearShapeSignal, this, &DisplayWgt::clearShapeSlot); connect(m_bll, &BllData::setPointMoveLimitSignal, this, &DisplayWgt::setPointMoveLimitSlot); connect(m_bll, &BllData::cancelPointMoveLimitSignal, this, &DisplayWgt::cancelPointMoveLimitSlot); connect(m_bll, &BllData::PointMoveReflectShapeSignal, this, &DisplayWgt::PointMoveReflectShapeSlot); connect(m_bll, &BllData::ShapeMoveReflectPointSignal, this, &DisplayWgt::ShapeMoveReflectPointSlot); connect(m_bll, &BllData::deleteShapeSignal, this, &DisplayWgt::deleteShapeSlot); } DisplayWgt::~DisplayWgt() { } void DisplayWgt::updateImgDataSlot(int min, int max) { m_width = max - min; m_center = (min + max) / 2; m_paintEnable = true; update(); } void DisplayWgt::paintEvent(QPaintEvent* event) { QStyleOption opt; opt.init(this); QPainter p(this); style()->drawPrimitive(QStyle::PE_Widget, &opt, &p, this); if (m_paintEnable) { QRect target(0, 0, this->width(), this->height()); quint16* m_grayImg = BllData::getSingleImg(); uchar* m_img8bit = BllData::getImg8bit(); BllData::converToGray(m_grayImg, m_img8bit, m_width, m_center); QImage image(m_img8bit, BllData::ImgCol, BllData::ImgRow, QImage::Format_Grayscale8); p.drawImage(target, image); } p.setRenderHint(QPainter::Antialiasing, true); p.setPen(QPen(Qt::yellow, 1)); if (m_singleCurve.size()) { for (int i = 0; i < m_singleCurve.size() - 1; i++) { QPoint p1(m_singleCurve[i].x(), m_singleCurve[i].y()); QPoint p2(m_singleCurve[i + 1].x(), m_singleCurve[i + 1].y()); p.drawLine(p1, p2); } } if (m_Curves.size()) { for (int i = 0; i < m_Curves.size(); i++) { p.drawPolygon(m_Curves[i]); } } /*for (int i = 0; i < m_vecpolygonAllP.size(); i++) { int psize = m_vecpolygonAllP[i].size(); for (int j = 0; j < psize - 1; j++) { QPoint p1 = m_vecpolygonAllP[i][j]->getPos(); QPoint p2 = m_vecpolygonAllP[i][j + 1]->getPos(); p.drawLine(p1, p2); } p.drawLine(m_vecpolygonAllP[i][0]->getPos(), m_vecpolygonAllP[i][psize - 1]->getPos()); }*/ for (int i = 0; i < m_polygonPointsWVec.size(); i++) { int psize = m_polygonPointsWVec[i].size(); for (int j = 0; j < psize-1; j++) { QPoint p1 = m_polygonPointsWVec[i][j]->getPos(); QPoint p2 = m_polygonPointsWVec[i][j + 1]->getPos(); p.drawLine(p1, p2); } p.drawLine(m_polygonPointsWVec[i][0]->getPos(), m_polygonPointsWVec[i][psize - 1]->getPos()); } //绘制图形 if (m_state == ToolState) { QPoint center; int ra, ll, ss; switch (m_shape) { case RectShape: p.drawRect(QRect(m_startP, m_endP)); break; case CircleShape: center.setX((m_startP.x() + m_endP.x()) / 2); center.setY((m_startP.y() + m_endP.y()) / 2); //ra = abs(m_startP.x() - m_endP.x()) / 2; ra = sqrt(pow(center.x() - m_startP.x(), 2) + pow(center.y() - m_startP.y(), 2)); p.drawEllipse(center, ra, ra); break; case EllipseShape: center.setX((m_startP.x() + m_endP.x()) / 2); center.setY((m_startP.y() + m_endP.y()) / 2); ll = abs(m_startP.x() - m_endP.x()) / 2; ss = abs(m_startP.y() - m_endP.y()) / 2; p.drawEllipse(center, ll, ss); break; default: break; } } } void DisplayWgt::mouseMoveEvent(QMouseEvent* event) { if (m_state == ToolState) { switch (m_shape) { case CurveShape: m_singleCurve.append(event->pos()); break; case RectShape: case CircleShape: case EllipseShape: m_endP = event->pos(); break; default: break; } } update(); } void DisplayWgt::mousePressEvent(QMouseEvent* event) { m_startP = event->pos(); if (event->button() == Qt::LeftButton) { if (m_state == ToolState) { if (m_shape == CurveShape) { m_singleCurve.append(event->pos()); } else if (m_shape == PolygonShape) { PointWidget* polygonp = new PointWidget(PolygonPoint, m_polygonId, event->pos(), this); polygonp->show(); m_singlePolygonW.push_back(polygonp); m_singlePolygon.push_back(event->pos()); } else { m_endP = m_startP; } } else if (m_state == DeleteState) { deleteFreeCurve(event->pos()); deletePolygonPoints(event->pos()); } } else { if (m_state == ToolState&& m_shape == PolygonShape) { if (m_singlePolygonW.size() < 3) { return; } m_polygonPointsWVec.push_back(m_singlePolygonW); QPolygon pts(m_singlePolygon); m_polygonsVec.push_back(pts); m_singlePolygonW.clear(); m_singlePolygon.clear(); m_polygonId++; } } update(); } void DisplayWgt::deleteFreeCurve(QPoint pos) { for (int i = 0; i < m_Curves.size(); i++) { QPolygon p = m_Curves[i]; if (p.containsPoint(pos, Qt::OddEvenFill)) { qDebug() << "deleteFreeCurve--------pos: " << p; m_Curves.remove(i); break; } else { qDebug() << "out range pos: " << pos; } } } void DisplayWgt::deletePolygonPoints(QPoint pos) { int index = -1; for (int i = 0; i < m_polygonsVec.size(); i++) { QPolygon p = m_polygonsVec[i]; if (p.containsPoint(pos, Qt::OddEvenFill)) { index = i; m_polygonsVec.remove(i); break; } else { } } if (index != -1) { int size = m_polygonPointsWVec[index].size(); for (int i = 0; i < size; i++) { delete m_polygonPointsWVec[index][i]; } m_polygonPointsWVec.remove(index); m_polygonId--; } } void DisplayWgt::mouseReleaseEvent(QMouseEvent* event) { if (m_state == ToolState) { int width = abs(m_startP.x() - m_endP.x()); int height = abs(m_startP.y() - m_endP.y()); if (m_shape == CurveShape) { m_singleCurve.append(m_singleCurve[0]); QPolygon polygon(m_singleCurve); m_Curves.append(polygon); m_singleCurve.clear(); } else if (m_shape == RectShape) { if (width < 10 || height<10) { update(); return; } int rbx = m_endP.x() > m_startP.x() ? m_endP.x() : m_startP.x(); int rby = m_endP.y() > m_startP.y() ? m_endP.y() : m_startP.y(); RectWidget* rectw = new RectWidget(m_rectId, QPoint(rbx, rby), width, height,this); rectw->show(); m_rectVec.push_back(rectw); PointWidget* rectp = new PointWidget(RectPoint, m_rectId, QPoint(rbx, rby),this); rectp->show(); m_rectPointVec.push_back(rectp); m_rectId++; } else if (m_shape == CircleShape) { if (width < 10 || height < 10) { update(); return; } int ltx = m_startP.x() < m_endP.x() ? m_startP.x() : m_endP.x(); int lty = m_startP.y() < m_endP.y() ? m_startP.y() : m_endP.y(); int rbx = m_endP.x() > m_startP.x() ? m_endP.x() : m_startP.x(); int rby = m_endP.y() > m_startP.y() ? m_endP.y() : m_startP.y(); QPoint center((ltx + rbx) / 2, (lty + rby) / 2); int ra = sqrt(pow(center.x() - m_startP.x(), 2) + pow(center.y() - m_startP.y(), 2)); CircleWidget* circlew = new CircleWidget(m_circleId, QPoint(ltx, lty), QPoint(rbx, rby), this); circlew->show(); m_circleVec.push_back(circlew); PointWidget* circlep = new PointWidget(CirclePoint, m_circleId, QPoint(rbx, rby), this); circlep->show(); m_circlePointVec.push_back(circlep); m_circleId++; } else if (m_shape == EllipseShape) { if (width < 10 || height < 10) { update(); return; } int ltx = m_startP.x() < m_endP.x() ? m