ShapeItem代码：
ShapeItem::ShapeItem(ShapeType type)
{
m_type = type;
m_lt = QPointF(0, 0);
m_rb = QPointF(0, 0);
m_deleteEnable = false;
m_bll = BllData::getInstance();
connect(m_bll, &BllData::deleteShapeEnableSignal, this, &ShapeItem::deleteShapeEnableSlot);
this->setFlags(QGraphicsItem::ItemIsSelectable |
QGraphicsItem::ItemIsMovable |
QGraphicsItem::ItemIsFocusable);
}
ShapeItem::~ShapeItem()
{}
QRectF ShapeItem::boundingRect() const {
int w = abs(m_lt.x() - m_rb.x());
int h = abs(m_lt.y() - m_rb.y());
QRectF rect(m_lt.x(), m_lt.y(), w + 2, h + 2);
return rect;
}
void ShapeItem::paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget) {
Q_UNUSED(option);
Q_UNUSED(widget);
painter->setPen(QPen(Qt::darkBlue, 1, Qt::SolidLine));
int width = abs(m_lt.x() - m_rb.x());
int height = abs(m_lt.y() - m_rb.y());
QPointF center((m_lt.x() + m_rb.x()) / 2, (m_lt.y() + m_rb.y()) / 2);
if (m_type == RectShape) {
QRectF rect(m_lt.x(), m_lt.y(), width, height);
painter->drawRect(rect);
}
else if (m_type == SquareShape) {
QRectF rect(m_lt.x(), m_lt.y(), width, width);
painter->drawRect(rect);
}
else if (m_type == CircleShape) {
QRectF rect(m_lt.x(), m_lt.y(), width, width);
painter->drawEllipse(rect);
}
else if (m_type == EllipseShape) {
QRectF rect(m_lt.x(), m_lt.y(), width, height);
painter->drawEllipse(rect);
}
}
void ShapeItem::setTopLeft(QPointF lt) {
m_lt = lt;
}
QPointF ShapeItem::getTopLeft() {
return m_lt;
}
void ShapeItem::setBottomRight(QPointF rb) {
m_rb = rb;
}
QPointF ShapeItem::getBottomRight() {
return m_rb;
}
void ShapeItem::mouseDoubleClickEvent(QGraphicsSceneMouseEvent* event) {
qDebug() << "===================mousePressEvent pos: " << event->scenePos();
if (m_deleteEnable) {
m_deleteEnable = false;
m_bll->returnDeletePos(m_lt);
}
}
void ShapeItem::mousePressEvent(QGraphicsSceneMouseEvent* event) {
qDebug() << "================ShapeItem::mousePressEvent---------pos--" << event->pos();
}
void ShapeItem::mouseMoveEvent(QGraphicsSceneMouseEvent* event) {
qDebug() << "=================ShapeItem::mouseMoveEvent-------------";
qreal dx = event->scenePos().x() - event->lastScenePos().x();
qreal dy = event->scenePos().y() - event->lastScenePos().y();
this->moveBy(dx, dy);
}
void ShapeItem::deleteShapeEnableSlot() {
m_deleteEnable = true;
}
void ShapeItem::wheelEvent(QGraphicsSceneWheelEvent* event) {
static int cnt = 0;
cnt++;
if (cnt > 1000) {
cnt = 0;
}
if (cnt % 5 == 0) {
int d = event->delta();
QPointF center((m_lt.x() + m_rb.x()) / 2, (m_lt.y() + m_rb.y()) / 2);
int w = abs(m_lt.x() - m_rb.x());
int h = abs(m_lt.y() - m_rb.y());
if (d > 0) {
w = w + 5;
h = h + 5;
m_lt.setX(center.x() - w / 2);
m_lt.setY(center.y() - h / 2);
m_rb.setX(center.x() + w / 2);
m_rb.setY(center.y() + h / 2);
}
else {
w = w - 5;
h = h - 5;
w = w > 5 ? w : 5;
h = h > 5 ? h : 5;
m_lt.setX(center.x() - w / 2);
m_lt.setY(center.y() - h / 2);
m_rb.setX(center.x() + w / 2);
m_rb.setY(center.y() + h / 2);
}
m_bll->wheelUpdateData();
}
}
主UI代码：
GraphViewDemo2::GraphViewDemo2(QWidget *parent)
: QWidget(parent)
{
ui.setupUi(this);
m_type = NoShape;
m_bll = BllData::getInstance();
m_scene = new GraphicsScene;
/*connect(m_bll, &BllData::updateRectPosSignal, this, &GraphViewDemo2::updateRectPosSlot);
connect(m_bll, &BllData::releaseRectPosSignal, this, &GraphViewDemo2::releaseRectPosSlot);*/
connect(m_bll, &BllData::returnDeletePosSignal, this, &GraphViewDemo2::returnDeletePosSlot);
connect(m_bll, &BllData::wheelUpdateDataSignal, this, &GraphViewDemo2::wheelUpdateDataSlot);
connect(m_bll, &BllData::pressRectPosSignal, this, &GraphViewDemo2::pressRectPosSlot);
//ui.graphicsView->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
//ui.graphicsView->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
设置场景范围
ui.graphicsView->resize(1440, 1120);
//ui.graphicsView->setSceneRect(INT_MIN / 2, INT_MIN / 2, INT_MAX, INT_MAX);
反锯齿
//ui.graphicsView->setRenderHints(QPainter::Antialiasing);
m_scene->setBackgroundBrush(Qt::gray);
ui.graphicsView->setScene(m_scene);
}
GraphViewDemo2::~GraphViewDemo2()
{
}
void GraphViewDemo2::pressRectPosSlot(QPointF pos) {
int w = 100;
int h = 80;
ShapeItem* item;
if (m_type == RectShape) {
int ltx = pos.x() - w / 2;
int lty = pos.y() - h / 2;
int rbx = pos.x() + w / 2;
int rby = pos.y() + h / 2;
item = new ShapeItem(RectShape);
item->setTopLeft(QPointF(ltx, lty));
item->setBottomRight(QPointF(rbx, rby));
m_scene->addItem(item);
}
else if (m_type == SquareShape) {
h = 100;
int ltx = pos.x() - w / 2;
int lty = pos.y() - h / 2;
int rbx = pos.x() + w / 2;
int rby = pos.y() + h / 2;
item = new ShapeItem(SquareShape);
item->setTopLeft(QPointF(ltx, lty));
item->setBottomRight(QPointF(rbx, rby));
m_scene->addItem(item);
}
else if (m_type == CircleShape) {
h = 100;
int ltx = pos.x() - w / 2;
int lty = pos.y() - h / 2;
int rbx = pos.x() + w / 2;
int rby = pos.y() + h / 2;
item = new ShapeItem(CircleShape);
item->setTopLeft(QPointF(ltx, lty));
item->setBottomRight(QPointF(rbx, rby));
m_scene->addItem(item);
}
else if (m_type == EllipseShape) {
h = 80;
int ltx = pos.x() - w / 2;
int lty = pos.y() - h / 2;
int rbx = pos.x() + w / 2;
int rby = pos.y() + h / 2;
item = new ShapeItem(EllipseShape);
item->setTopLeft(QPointF(ltx, lty));
item->setBottomRight(QPointF(rbx, rby));
m_scene->addItem(item);
}
m_type = NoShape;
}
void GraphViewDemo2::returnDeletePosSlot(QPointF pos) {
qDebug() << "returnPressPosSlot pos: " << pos;
for (int i = 0; i < m_scene->items().size(); i++) {
ShapeItem* item = (ShapeItem*)m_scene->items()[i];
QPointF lt = item->getTopLeft();
if (pos == lt) {
qDebug() << "index: " << i;
m_scene->removeItem(item);
break;
}
}
}
void GraphViewDemo2::on_deleteBtn_clicked() {
m_bll->deleteShapeEnable();
}
void GraphViewDemo2::on_clearBtn_clicked() {
m_scene->clear();
//ui.graphicsView->setScene(m_scene);
}
void GraphViewDemo2::wheelUpdateDataSlot() {
m_scene->update();
}
void GraphViewDemo2::on_rectBtn_clicked() {
m_bll->setShapeEnable();
m_type = RectShape;
}
void GraphViewDemo2::on_squareBtn_clicked() {
m_bll->setShapeEnable();
m_type = SquareShape;
}
void GraphViewDemo2::on_circleBtn_clicked() {
m_bll->setShapeEnable();
m_type = CircleShape;
}
void GraphViewDemo2::on_ellipseBtn_clicked() {
m_bll->setShapeEnable();
m_type = EllipseShape;
}
Scene代码：
GraphicsScene::GraphicsScene(QObject *parent)
: QGraphicsScene(parent)
{
m_startP.setX(0);
m_startP.setY(0);
m_endP.setX(0);
m_endP.setY(0);
m_enable = false;
m_bll = BllData::getInstance();
connect(m_bll, &BllData::setShapeEnableSignal, this, &GraphicsScene::setShapeEnableSlot);
}
GraphicsScene::~GraphicsScene()
{}
void GraphicsScene::mousePressEvent(QGraphicsSceneMouseEvent* event) {
if (m_enable) {
m_enable = false;
m_startP = event->scenePos();
m_endP = m_startP;
m_bll->pressRectPos(m_startP);
}
else {
//qDebug() << "GraphicsScene::mousePressEvent---------------";
//event->ignore();
QGraphicsScene::mousePressEvent(event);
}
}
void GraphicsScene::mouseMoveEvent(QGraphicsSceneMouseEvent* event) {
QGraphicsScene::mouseMoveEvent(event);
//qDebug() << "m_startp: " << m_startP << " m_endp: " << m_endP;
}
void GraphicsScene::mouseReleaseEvent(QGraphicsSceneMouseEvent* event) {
QGraphicsScene::mouseReleaseEvent(event);
}
void GraphicsScene::setShapeEnableSlot() {
qDebug() << "setRectEnableSlot---------------";
m_enable = true;
}
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