[英]How to make a shape outside of the main() function
我知道如何定義形狀(此處為矩形)並將其附加到C ++中的窗口,如下所示:
#include <Simple_window.h>
void cir() { Circle c(Point(100,100),50); }
int main()
{
Simple_window win(Point(100,100),600,400, "test");
Rectangle r(Point(100,100),Point(300,200));
win.attach(r);
win.wait_for_botton();
}
但如何界定的形狀(比如一個circle
由cir()
函數,它是)在外面main()
函數是如何建立內部的CIR()函數的一個圓,它返回一個圈子,當我把它稱為在我的main()函數,以便可以將其附加到窗口win
以使其可見?
PS:我只是通過PPP書( this )才學習C ++,直到第14章:-)
大概是這樣嗎?
#include <Simple_window.h>
Circle c(Point(100,100),50);
int main()
{
Simple_window win(Point(100,100),600,400, "test");
Rectangle r(Point(100,100),Point(300,200));
win.attach(r);
win.attach(c);
win.wait_for_botton();
}
或者,如果您想使用cir函數:
Circle cir()
{
Circle c(Point(100,100),50);
return c;
}
int main()
{
Simple_window win(Point(100,100),600,400, "test");
Rectangle r(Point(100,100),Point(300,200));
win.attach(r);
win.attach(cir());
win.wait_for_botton();
}
也許您想做這樣的事情,從您的問題中很難知道:
// The & is important, it will pass this argument as a reference
void attachCircleToWindow(Simple_window &win)
{
Circle c(Point(100,100),50);
win.attach(c);
}
int main()
{
Simple_window win(Point(100,100),600,400, "test");
Rectangle r(Point(100,100),Point(300,200));
win.attach(r);
attachCircleToWindow(win);
win.wait_for_botton();
}
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