#include "gsrootitem.h"
#include <QDebug>
#include "gsshapebaseitem.h"
#include "gsshapelineitem.h"
#include <QGraphicsScene>

GsRootItem::GsRootItem(const QSizeF &size, QGraphicsObject *parent):
 QGraphicsObject (parent),
 m_size(size)
{
 m_pTempLayer = new GsTempCanvasLayer(size,this);
 m_pTempLayer->setZValue(10);

 m_pShapeFactory = new GsShapeFactory();
}

GsRootItem::~GsRootItem()
{
 SAFE_DELETE(m_pShapeFactory);
}

void GsRootItem::drawPress(int id, const QPointF &p)
{
 ShapeInfo info;
 info.firstPos = p;
 info.type = getCurType();
 m_Objs.insert(id,info);
}

void GsRootItem::drawMove(int id, const QPointF &lastPoint, const QPointF &curPoint)
{
 if(!m_Objs.contains(id)){
 return;
 }
 ShapeInfo info = m_Objs.value(id);
 m_pTempLayer->drawShape(info.type,info.firstPos,curPoint);
}

void GsRootItem::drawRelease(int id, const QPointF &point)
{
 if(!m_Objs.contains(id)){
 return;
 }
 ShapeInfo info = m_Objs.value(id);
 drawRealShape(info.type,info.firstPos,point);
 m_Objs.remove(id);
 m_pTempLayer->clear();
}

void GsRootItem::clear()
{
 QList<QGraphicsItem*> items = this->childItems();
 QList<QGraphicsItem*>::iterator it = items.begin();
 while(it != items.end()){
 QGraphicsItem* item = *it++;
 if(item->type() == Type_ShapeItem){
 delete item;
 item = nullptr;
 }
 }
}

QRectF GsRootItem::boundingRect() const
{
 return QRectF(0,0,m_size.width(),m_size.height());
}

void GsRootItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
 painter->setPen(Qt::NoPen);
 painter->setBrush(Qt::white);
 painter->drawRect(this->boundingRect());
}

void GsRootItem::drawRealShape(GsShapeType type, QPointF p1, QPointF p2)
{
 //计算图形绘制区域
 QRectF rect;
 rect.setX(qMin(p1.x(),p2.x()));
 rect.setY(qMin(p1.y(),p2.y()));
 if(type == Shape_Circle){
 rect.setWidth(qAbs(p1.y() - p2.y()));
 rect.setHeight(qAbs(p1.y() - p2.y()));
 }
 else{
 rect.setWidth(qAbs(p1.x() - p2.x()));
 rect.setHeight(qAbs(p1.y() - p2.y()));
 }
 rect.adjust(-5,-5,5,5);
 GsShapeBaseItem * item = m_pShapeFactory->getShapeItem(type,rect,this);
 item->drawShape(p1,p2);
}