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我一次執行多個函數時遇到問題。 具體來說，我有兩個類（MyRect和空格）。這個想法和太空入侵者很相似，但是我堅持着開始。在類MyRect中，我定義了兩個矩形:: body（船體）和bullet（船舶項目符號）。主類空間創建爲MyRect新對象，主體爲& &項目符號矩形。此外還有keyPress事件的定義。 問題是，當我發射子彈時，everythig會停止移動子彈，直到循環MyRect :: fireBullet（int x，int y）完成，我無法在此事件中移動船。顯然，我做了一些根本性的錯誤，所以如果有人願意澄清這一點。如何在C++中創建並行事件（具體的Qt 4.6）
這裏是示例代碼::
MyRect.h
#include <QWidget>
#include <QRect>
#include <QMainWindow>
#include <QPainter>
#include <QLabel>
#include <ctime>
#include <QtGui/QMainWindow>
class space;
class MyRect : public QObject {
Q_OBJECT
public:
MyRect(int in_x, int in_y, int in_w, int in_h, QWidget* parent)
{
itsx = in_x;
itsy = in_y;
itsw = in_w;
itsh = in_h;
body = new QRect(itsx, itsy, itsw, itsh);
bullet = new QRect(itsx+41, itsy-15, itsw/8, itsh/2);
itsParent = parent;
}
~MyRect() {}
void move(int x ,int y);
public slots:
void fireBullet(int x, int y);
private:
int itsx;
int itsy;
int itsw;
int itsh;
QWidget* itsParent;
QRect* body;
QRect* bullet;
friend class space;
};
MyRect.cpp
#include "MyRect.h"
void wait(float seconds)
{
clock_t endwait;
endwait = clock() + seconds * CLOCKS_PER_SEC ;
while (clock() < endwait) {}
}
void MyRect::move(int x, int y)
{
body->moveTo(x,y);
bullet->moveTo(x+35, y-15);
}
void MyRect::fireBullet(int x, int y)
{
y = y-15;
for(int i=0 ; i<200 ; i++)
{
bullet->moveTo(x+41, y--);
itsParent->repaint();
wait(0.001);
}
}
space.h
#include <QKeyEvent>
#include <QMouseEvent>
#include "MyRect.h"
class space : public QMainWindow
{
Q_OBJECT
public:
space(QWidget *parent = 0);
~space(){}
protected:
void paintEvent(QPaintEvent *event);
void keyPressEvent(QKeyEvent* event);
private:
private:
int x;
int y;
int w;
int h;
MyRect* ship;
signals:
void fireBullet(int x, int y);
};
space.cpp
#include "space.h"
#include <QApplication>
space::space(QWidget *parent)
: QMainWindow(parent)
{
x = 170;
y = 250;
w = 90;
h = 25;
ship = new MyRect(x,y,w,h, this);
connect(this, SIGNAL(fireBullet(int,int)), ship, SLOT(fireBullet(int,int)));
}
void space::paintEvent(QPaintEvent *event)
{
QPen pen(Qt::black, 2, Qt::SolidLine);
QColor hourColor(0, 255, 0);
QPainter painter(this);
painter.setBrush(hourColor);
painter.setPen(pen);
painter.drawRect(*(ship->body));
painter.drawRect(*(ship->bullet));
}
void space::keyPressEvent(QKeyEvent* event)
{
switch(event->key()) {
case Qt::Key_D :
{
x = x+10;
ship->move(x,y);
this->update();
break;
}
case Qt::Key_A :
{
x = x-10;
ship->move(x,y);
this->update();
break;
}
case Qt::Key_M :
{
emit fireBullet(x,y);
break;
}
}
}
的main.cpp
#include "space.h"
#include <QDesktopWidget>
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
space window;
window.setWindowTitle("Lines");
window.resize(500,500);
window.show();
return app.exec();
}
感謝您的答案。