#include <cmath>
#include <QGraphicsPixmapItem>
#include <QGraphicsScene>
#include <QGraphicsView>
#include <QTimer>
#include <QVBoxLayout>
#include "pongmaindialog.h"
#include "ui_pongmaindialog.h"
struct Background : public QGraphicsPixmapItem
{
Background(
QGraphicsItem * parent = 0,
QGraphicsScene * scene = 0,
const int width = 256,
const int height = 256)
: QGraphicsPixmapItem(parent,scene)
{
QImage i(width,height,QImage::Format_ARGB32);
for (int y=0;y!=height;++y)
{
for (int x=0;x!=width;++x)
{
const int gray = (x + y) % 256;
i.setPixel(QPoint(x,y),QColor(gray,gray,gray).rgb());
}
}
this->setPixmap(this->pixmap().fromImage(i));
}
};
struct Sprite : public QGraphicsPixmapItem
{
Sprite(
QGraphicsItem * parent = 0,
QGraphicsScene * scene = 0,
const int width = 32,
const int height = 32)
: QGraphicsPixmapItem(parent,scene),
dx(1.0), dy(1.0), maxx(0.0), maxy(0.0)
{
QImage i(width,height,QImage::Format_ARGB32);
for (int y=0;y!=height;++y)
{
for (int x=0;x!=width;++x)
{
const int gray = ((8 * x) + (8 * y)) % 256;
i.setPixel(QPoint(x,y),QColor(gray,gray,gray).rgb());
}
}
this->setPixmap(this->pixmap().fromImage(i));
}
void advance(int)
{
double new_x = this->x();
double new_y = this->y();
new_x+=dx;
new_y+=dy;
if (new_x<0.0 || new_x>maxx) dx= -dx;
if (new_y<0.0 || new_y>maxy) dy= -dy;
this->setX(new_x);
this->setY(new_y);
}
void setRect(const int width, const int height)
{
maxx = static_cast<double>(width - this->pixmap().width() );
maxy = static_cast<double>(height - this->pixmap().height());
}
private:
double dx;
double dy;
double maxx;
double maxy;
};
PongMainDialog::PongMainDialog(QWidget *parent) :
QDialog(parent),
ui(new Ui::PongMainDialog)
{
ui->setupUi(this);
//Start with creating a scene
QGraphicsScene * const scene(new QGraphicsScene(this));
//Connect a view to display the scene
QGraphicsView * const view(new QGraphicsView(scene));
//view->setScene(scene);
//Create a layout to put the scene in
QVBoxLayout * const layout(new QVBoxLayout(this));
layout->addWidget(view);
//Add background to scene
Background * const background(new Background(0,scene));
//Add multiple sprites
{
const int n_sprites = 20;
const double midx = background->pixmap().width() / 2.0;
const double midy = background->pixmap().height() / 2.0;
const double ray = std::min(midx,midy) * 0.8;
const double d_angle = 2.0 * M_PI / static_cast<double>(n_sprites);
double angle = 0.0;
for (int i=0; i!=n_sprites; ++i)
{
Sprite * const sprite(new Sprite(0,scene));
const double x = midx + (std::sin(angle) * ray) - (sprite->pixmap().width() / 2);
const double y = midy - (std::cos(angle) * ray) - (sprite->pixmap().height() / 2);
sprite->setX(x);
sprite->setY(y);
sprite->setRect(background->pixmap().width(),background->pixmap().height());
angle+=d_angle;
}
}
//Create a dialog to display to laid-out-scene
//this->setLayout(layout);
this->setGeometry(view->rect());
//Create a timer to call 'advance' on all sprites'
QTimer * const timer(new QTimer(scene));
timer->connect(timer, SIGNAL(timeout()), scene, SLOT(advance()));
timer->start(20);
}
PongMainDialog::~PongMainDialog()
{
delete ui;
}
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