我想到写原始蛇。我有一个窗口,程序可以在其中绘制随机线条。
但我想不出如何捕捉按下的键来改变画线的方向。
class QUpdatingPathIte : public QGraphicsPathItem
{
void advance(int phase)
{
if (phase == 0)
return;
int x,y;
int w,a,s,d;
char c;
//
// HOW TO MAKE THIS HERE? (i had done early in console application)
// but i can't do this in GUI , what should i do?
scanf("%c",&c);
if (c=='w')
{ x=-20; y=0; }
else if (c=='s')
{ x=20; y=0; }
else if (c=='a')
{ x=0; y=-20; }
else if(c=='d')
{ x=0; y=20; }
QPainterPath p = path();
p.lineTo(x, y);
setPath(p);
}
};
#include <QtGui/QApplication>
#include "dialog.h"
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QGraphicsScene s;
QGraphicsView v(&s);
QUpdatingPathIte item;
item.setPen(QPen(QColor("black")));
s.addItem(&item);
v.show();
QTimer *timer = new QTimer(&s);
timer->connect(timer, SIGNAL(timeout()), &s, SLOT(advance()));
timer->start(500);
return a.exec();
}
QGraphicsView继承自QWidget,因为它继承自QAbstractScrollArea。您应该创建 QGraphicsView 的自定义子类并覆盖函数 keyPressEvent()。例子:
class SnakeView : public QGraphicsView
{
protected:
keyPressEvent(QKeyEvent *e)
{
// Do something
// Otherwise pass to the graphics view
QGraphicsView::keyPressEvent(e)
}
};
然后,您将创建一个 SnakeView 对象,而不是创建 QGraphicsView 对象。
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