#include?“customsense.h“
#include?“ui_customsense.h“

#include?
#include?
#include?



CustomScene::CustomScene（）{
????item?=?new?QGraphicsRectItem（）;
????addItem（item）;
}

//?自定義?Scene
void?CustomScene::mousePressEvent（QGraphicsSceneMouseEvent?*event）
{
????qDebug（）?<????QGraphicsScene::mousePressEvent（event）;
????if?（!event->isAccepted（））?{
????????if?（event->button（）?==?Qt::LeftButton）?{
????????????//?在?Scene?上添加一個自定義?item
????????????QPointF?point?=?event->scenePos（）;
????????????startPoint?=?point;
????????????qDebug（）<<“startPoint:“<????????????isDrawing?=?true;
????????}?else?if?（event->button（）?==?Qt::RightButton）?{
????????????//?檢測光標下是否有?item
????????????QGraphicsItem?*itemToRemove?=?NULL;
????????????foreach?（QGraphicsItem?*item?items（event->scenePos（）））?{
????????????????if?（item->type（）?==?QGraphicsRectItem::Type）?{
????????????????????itemToRemove?=?item;
????????????????????break;
????????????????}
????????????}
????????????//?從?Scene?上移除?item
????????????if?（itemToRemove?!=?NULL）
????????????????removeItem（itemToRemove）;
????????}
????}
}

void?CustomScene::mouseMoveEvent（QGraphicsSceneMouseEvent?*event）
{
????QGraphicsScene::mouseMoveEvent（event）;
????if（event->buttons（）&Qt::LeftButton）??//如果鼠標左鍵按著的同時移動鼠標
????{
????????qDebug（）?<
????????QPointF?point?=?event->scenePos（）;
????????endPoint?=?point;

????????if（endPoint.x（）-?startPoint.x（）>20&&endPoint.y（）-?startPoint.y（）>20）
????????{
????????????removeItem（item）;
????????????QPen?p;
????????????p.setWidth（2）;
????????????p.setColor（QColor（0?160?230））;
????????????item->setPen（p）;
????????????item->setRect（startPoint.x（）?startPoint.y（）?endPoint.x（）-startPoint.x（）?endPoint.y（）-startPoint.y（））;
????????????addItem（item）;
????????}
????}
}

void?CustomScene::mouseReleaseEvent（QGraphicsSceneMouseEvent?*event）
{
????if（event->button（）==Qt::LeftButton）??//如果鼠標左鍵按著的同時移動鼠標
????{
????????QGraphicsScene::mouseMoveEvent（event）;
????????qDebug（）?<????????QPointF?point?=?event->scenePos（）;
????????endPoint?=?point;
????????qDebug（）<<“endPoint:“<????}
}

void?CustomScene::keyPressEvent（QKeyEvent?*event）?{
????if?（event->key（）?==?Qt::Key_Backspace）?{
????????//?移除所有選中的?items
????????qDebug（）?<????????while?（!selectedItems（）.isEmpty（））?{
????????????removeItem（selectedItems（）.front（））;
????????}
????}?else?{
????????QGraphicsScene::keyPressEvent（event）;
????}
}

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2018-11-20?09:29??CustomSence\
?????文件????????2765??2018-11-20?09:28??CustomSence\customsense.cpp
?????文件?????????683??2018-11-20?09:28??CustomSence\customsense.h
?????文件????????1092??2018-11-20?09:27??CustomSence\CustomSense.pro
?????文件???????23894??2018-11-20?09:29??CustomSence\CustomSense.pro.user
?????文件????????1471??2018-11-16?14:28??CustomSence\customsense.ui
?????文件??????239553??2018-11-19?13:35??CustomSence\image.jpg
?????文件??????????93??2018-11-16?16:27??CustomSence\image.qrc
?????文件?????????466??2018-11-20?09:29??CustomSence\main.cpp