Qt-drawcli Qt之图形的基本操作

#include "drawtool.h" #include "drawobj.h" #include <QDebug> #include <QGraphicsSceneMouseEvent> #include <QGraphicsView> #include <QGraphicsLineItem> #include <QtMath> #define PI 3.14 QList<DrawTool*> DrawTool::c_tools; QPointF DrawTool::c_down; QPointF DrawTool::c_last; quint32 DrawTool::c_nDownFlags; DrawShape DrawTool::c_drawShape = selection; static SelectTool selectTool; static RectTool lineTool(line); static RectTool rectTool(rectangle); static RectTool roundRectTool(roundrect); static RectTool ellipseTool(ellipse); static RotationTool rotationTool; enum SelectMode { none, netSelect, move, size, rotate }; SelectMode selectMode = none; SizeHandleRect::Direction nDragHandle = SizeHandleRect::None; static void setCursor(QGraphicsScene * scene , const QCursor & cursor ) { QList<QGraphicsView*> views = scene->views(); if ( views.count() > 0 ){ QGraphicsView * view = views.first(); view->setCursor(cursor); } } DrawTool::DrawTool(DrawShape shape) { m_drawShape = shape ; c_tools.push_back(this); } void DrawTool::mousePressEvent(QGraphicsSceneMouseEvent *event, DrawScene *scene) { c_down = event->scenePos(); c_last = event->scenePos(); } void DrawTool::mouseMoveEvent(QGraphicsSceneMouseEvent *event, DrawScene *scene) { c_last = event->scenePos(); } void DrawTool::mouseReleaseEvent(QGraphicsSceneMouseEvent *event, DrawScene *scene) { if (event->scenePos() == c_down) c_drawShape = selection; setCursor(scene,Qt::ArrowCursor); } DrawTool *DrawTool::findTool(DrawShape drawShape) { QList<DrawTool*>::const_iterator iter = c_tools.constBegin(); for ( ; iter != c_tools.constEnd() ; ++iter ){ if ((*iter)->m_drawShape == drawShape ) return (*iter); } return 0; } SelectTool::SelectTool() :DrawTool(selection) { m_lastSize.setHeight(0); m_lastSize.setWidth(0); dashRect = 0; dashLine = 0; m_hoverSizer = false; } void SelectTool::mousePressEvent(QGraphicsSceneMouseEvent *event, DrawScene *scene) { DrawTool::mousePressEvent(event,scene); if (!m_hoverSizer) scene->mouseEvent(event); selectMode = none; QList<QGraphicsItem *> items = scene->selectedItems(); GraphicsItem *item = 0; if ( items.count() == 1 ) item = qgraphicsitem_cast<GraphicsItem*>(items.first()); if ( item != 0 ){ nDragHandle = item->hitTest(event->scenePos()); if ( nDragHandle !=SizeHandleRect::None) selectMode = size; else selectMode = move; m_lastSize = item->boundingRect().size(); } if( selectMode == none ){ selectMode = netSelect; QList<QGraphicsView*> views = scene->views(); if ( views.count() > 0 ){ QGraphicsView * view = views.first(); view->setDragMode(QGraphicsView::RubberBandDrag); } } if ( selectMode == move && items.count() == 1 ){ if (dashRect ){ scene->removeItem(dashRect); delete dashRect; dashRect = 0; } if (dashLine ) { scene->removeItem(dashLine); delete dashLine; dashLine = 0; } dashRect = new QGraphicsPathItem(item->shape()); dashRect->setPen(Qt::DashLine); dashRect->setPos(item->pos()); dashRect->setTransformOriginPoint(item->transformOriginPoint()); dashRect->setTransform(item->transform()); dashRect->setRotation(item->rotation()); scene->addItem(dashRect); dashLine = new QGraphicsLineItem(); dashLine->setPos(item->pos()); dashLine->setPen(Qt::DashLine); scene->addItem(dashLine); } qDebug() << " selectTool press:" <<event->scenePos() << " mode :" << selectMode << " items :" << items.count(); } void SelectTool::mouseMoveEvent(QGraphicsSceneMouseEvent *event, DrawScene *scene) { DrawTool::mouseMoveEvent(event,scene); bool isGroup = false; QList<QGraphicsItem *> items = scene->selectedItems(); GraphicsItem * item = 0; if ( items.count() == 1 ){ item = qgraphicsitem_cast<GraphicsItem*>(items.first()); if ( item != 0 ){ if ( nDragHandle != SizeHandleRect::None && selectMode == size ){ QSizeF delta(c_last.x() - c_down.x() , c_last.y() - c_down.y()); item->resizeTo(nDragHandle,c_last); } else if(nDragHandle == SizeHandleRect::None && selectMode == selection ){ SizeHandleRect::Direction handle = item->hitTest(event->scenePos()); if ( handle != SizeHandleRect::None){ setCursor(scene,item->getCursor(handle)); m_hoverSizer = true; }else{ setCursor(scene,Qt::ArrowCursor); m_hoverSizer = false; } } } QGraphicsItemGroup *item1 = qgraphicsitem_cast<QGraphicsItemGroup*>(items.first()); if ( item1 != NULL ){ isGroup = true; } } if ( selectMode == move ){ if ( dashRect ){ dashRect->setPos(c_last); dashLine->setLine(QLineF(dashLine->mapFromItem(item,item->boundingRect().center()), dashLine->mapFromScene(c_last))); scene->update(); } } if ( (selectMode != size && items.count() > 1) || isGroup ) { scene->mouseEvent(event); } } void SelectTool::mouseReleaseEvent(QGraphicsSceneMouseEvent *event, DrawScene *scene) { DrawTool::mouseReleaseEvent(event,scene); QList<QGraphicsItem *> items = scene->selectedItems(); if ( items.count() == 1 ){ GraphicsItem * item = qgraphicsitem_cast<GraphicsItem*>(items.first()); if ( item != 0 && selectMode == move && c_last != c_down ){ item->setPos(c_last); } } if (selectMode == netSelect ){ QList<QGraphicsView*> views = scene->views(); if ( views.count() > 0 ){ QGraphicsView * view = views.first(); view->setDragMode(QGraphicsView::NoDrag); } } if (dashRect ){ scene->removeItem(dashRect); delete dashRect; dashRect = 0; scene->removeItem(dashLine); delete dashLine; dashLine = 0; } selectMode = none; nDragHandle = SizeHandleRect::None; m_hoverSizer = false; scene->mouseEvent(event); qDebug() << " selectTool release:" <<event->scenePos() << "mode :" << selectMode; } RotationTool::RotationTool() :DrawTool(rotation) { lastAngle == 0; dashRect = 0; } void RotationTool::mousePressEvent(QGraphicsSceneMouseEvent *event, DrawScene *scene) { DrawTool::mousePressEvent(event,scene); QList<QGraphicsItem *> items = scene->selectedItems(); if ( items.count() == 1 ){ GraphicsItem * item = qgraphicsitem_cast<GraphicsItem*>(items.first()); if ( item != 0 ){ nDragHandle = item->hitTest(event->scenePos()); if ( nDragHandle !=SizeHandleRect::None) { QPointF origin = item->mapToScene(item->boundingRect().center()); qreal len_y = c_last.y() - origin.y(); qreal len_x = c_last.x() - origin.x(); qreal angle = atan2(len_y,len_x)*180/PI; lastAngle = angle; selectMode = rotate; if (dashRect ){ scene->removeItem(dashRect); delete dashRect; dashRect = 0; } dashRect = new QGraphicsPathItem(item->shape()); dashRect->setPen(Qt::DashLine); dashRect->setPos(item->pos()); dashRect->setTransformOriginPoint(item->transformOriginPoint()); dashRect->setTransform(item->transform()); dashR