#include "target.h"#include <iostream>#include <QtGui>#include <math.h>using namespace std;static const double Pi = 3.14159265358979323846264338327950288419717;Target::Target()    : m_speed(qrand()%10+1), m_course(qrand() % 6), m_type(qrand()%3), m_attribute(qrand()%3) {    switch(m_attribute) {    case 0: // 敵方		m_color.setRgb(255, 0, 0);		break;    case 1: // 我方		m_color.setRgb(0, 255, 255);		break;    default: // 不明		m_color.setRgb(255, 255, 0);	break;    }		    setAcceptDrops(true);}Target::Target(qreal speed, qreal course, short type, short attribute){	m_speed = speed;	m_course = course;	m_type = type;	m_attribute = attribute;    switch(m_attribute) {    case 0: // 敵方		m_color.setRgb(255, 0, 0);		break;    case 1: // 我方		m_color.setRgb(0, 255, 255);		break;    default: // 不明		m_color.setRgb(255, 255, 0);	break;    }		    setAcceptDrops(true);}QRectF Target::boundingRect() const{    qreal adjust = 0.5;    return QRectF(-20 - adjust, -22 - adjust,                  40 + adjust, 83 + adjust);}void Target::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *){	QPen pen(m_color);	pen.setWidth(2);    painter->setPen(pen);    switch(m_type) {    case 0: 	//水面目標 		painter->drawEllipse(-15, -15, 30, 30);    	break;    case 1:  	// 水下目標		painter->drawArc(-15, -15, 30, 30, 180*16, 180*16);    	break;   default:		// 空中目標		painter->drawLine(-15, 0, 0, -15);		painter->drawLine(0, -15, 15, 0);    	break;   }   	painter->drawLine(0, 0, int(m_speed*5*cos(m_course)), int(m_speed*5*sin(m_course)));}void Target::contextMenuEvent(QGraphicsSceneContextMenuEvent *event){     QMenu menu;     menu.setWindowOpacity(0.8);     QAction *removeAction = menu.addAction(tr("武器發射"));     QAction *markAction = menu.addAction(tr("電子干擾"));     QAction *selectedAction = menu.exec(event->screenPos());} void Target::mousePressEvent(QGraphicsSceneMouseEvent * event){	if((m_attribute != Us)) {		event->ignore();		return;	}    setCursor(Qt::ClosedHandCursor);			QByteArray itemData;	QDataStream dataStream(&itemData, QIODevice::WriteOnly);	dataStream << mapToParent(QPointF(0, 0));	//傳遞場景坐標		QMimeData *data = new QMimeData;	data->setData("application/x-dndtarget", itemData);	    QDrag *drag = new QDrag(event->widget());    drag->setMimeData(data);    drag->start();}void Target::dragEnterEvent(QGraphicsSceneDragDropEvent * event){	if(m_attribute != Foe)		event->ignore();    else if(event->mimeData()->hasFormat("application/x-dndtarget")) {        event->accept();    } else {        event->ignore();    }	}  void Target::dragMoveEvent(QGraphicsSceneDragDropEvent * event){	if(m_attribute != Foe)		event->ignore();    else if(event->mimeData()->hasFormat("application/x-dndtarget")) {        event->accept();    } else {        event->ignore();    }	}void Target::dropEvent(QGraphicsSceneDragDropEvent * event){	if(m_attribute != Foe)		event->ignore();    else if (event->mimeData()->hasFormat("application/x-dndtarget")) {        QByteArray itemData = event->mimeData()->data("application/x-dndtarget");        QDataStream dataStream(&itemData, QIODevice::ReadOnly);                QPointF missile;        dataStream >> missile;        QPointF owner = mapToParent(0, 0);        qreal dx = owner.x() - missile.x();        qreal dy = owner.y() - missile.y();        qreal course = atan(dy/dx);        QPointF test = mapFromScene(missile);        if (((test.x() > 0) && (test.y() > 0)) ||        	((test.x() > 0) && (test.y() < 0)) )        	course = Pi + course;        Target *target = new Target(12, course, Air, Us);        target->setPos(missile);		target->setVisible(true);        scene()->addItem(target);        event->accept();    } else {        event->ignore();    }	}