doStepBomb: cache rounded values of Gear^.X/Y instead of recalculating the exact same values up to 512 times
#include <QApplication>
#include "mainform.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
MyWindow *mainWin = new MyWindow;
mainWin->show();
return app.exec();
}