#include <cassert>
#include <iostream>
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Weffc++"
#pragma GCC diagnostic ignored "-Wunused-local-typedefs"
#include <boost/shared_ptr.hpp>
#include <QApplication>
#include <QBitmap>
#include <QFile>
#include <QGraphicsPixmapItem>
#include <QGraphicsScene>
#include <QGraphicsView>
#include <QTimer>
#pragma GCC diagnostic pop
struct ChangingBackground : public QGraphicsPixmapItem
{
explicit ChangingBackground(const int width, const int height)
: z(0)
{
QPixmap m(width,height);
this->setPixmap(m);
}
void advance(int)
{
QImage i = this->pixmap().toImage();
const int width = i.width();
const int height = i.height();
for (int y=0;y!=height;++y)
{
for (int x=0;x!=width;++x)
{
QPoint pos(x,y);
QColor c((x+z)%256,(y+z)%256,(x+y+z)%256);
i.setPixel(pos,c.rgb());
}
}
this->setPixmap(this->pixmap().fromImage(i));
++z;
}
private:
int z;
};
struct ChangingTransparentSprite : public QGraphicsPixmapItem
{
explicit ChangingTransparentSprite(
const std::string& filename,
const QColor& transparency_color = QColor(0,255,0)) //Lime green
: dx( ((std::rand() >> 4) % 3) - 1), //Random direction
dy( ((std::rand() >> 4) % 3) - 1), //Random direction
maxx(0),
maxy(0)
{
QPixmap pixmap(filename.c_str());
const QBitmap mask = pixmap.createMaskFromColor(transparency_color);
pixmap.setMask(mask);
this->setPixmap(pixmap);
//Change color
QImage i = this->pixmap().toImage();
const int width = i.width();
const int height = i.height();
const int dz = std::rand();
for (int y=0;y!=height;++y)
{
for (int x=0;x!=width;++x)
{
QPoint pos(x,y);
QColor color = i.pixel(pos);
if (color == QColor(0,0,0)) continue;
color.setRed((color.red() + dz) % 256);
color.setGreen((color.green() + dz) % 256);
color.setBlue((color.blue() + dz) % 256);
i.setPixel(pos,color.rgb());
}
}
this->setPixmap(this->pixmap().fromImage(i));
}
void advance(int)
{
int new_x = this->x();
int new_y = this->y();
new_x+=dx;
new_y+=dy;
if (new_x<0 || new_x>maxx) dx= -dx;
if (new_y<0 || new_y>maxy) dy= -dy;
this->setX(new_x);
this->setY(new_y);
//Change color
QImage i = this->pixmap().toImage();
const int width = i.width();
const int height = i.height();
for (int y=0;y!=height;++y)
{
for (int x=0;x!=width;++x)
{
QPoint pos(x,y);
QColor color = i.pixel(pos);
if (color == QColor(0,0,0)) continue;
color.setRed((color.red() + 1) % 256);
color.setGreen((color.green() + 1) % 256);
color.setBlue((color.blue() + 1) % 256);
i.setPixel(pos,color.rgb());
}
}
this->setPixmap(this->pixmap().fromImage(i));
}
void setRect(const int width, const int height)
{
maxx = width - this->pixmap().width();
maxy = height - this->pixmap().height();
}
private:
int dx;
int dy;
int maxx;
int maxy;
};
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
QGraphicsScene s;
QGraphicsView v(&s);
ChangingBackground background(512,512);
s.addItem(&background);
std::vector<boost::shared_ptr<ChangingTransparentSprite> > sprites;
//Add multiple sprites
const int n_sprites = 3;
for (int i=0; i!=n_sprites; ++i)
{
assert(QFile::exists(":/images/Bloem.png"));
boost::shared_ptr<ChangingTransparentSprite> sprite(
new ChangingTransparentSprite(":/images/Bloem.png"));
const int maxx = background.pixmap().width() - sprite->pixmap().width();
const int maxy = background.pixmap().height() - sprite->pixmap().height();
sprite->setX(std::rand() % maxx);
sprite->setY(std::rand() % maxy);
sprite->setRect(background.pixmap().width(),background.pixmap().height());
s.addItem(sprite.get());
sprites.push_back(sprite);
}
v.show();
boost::shared_ptr<QTimer> timer(new QTimer(&s));
timer->connect(timer.get(), SIGNAL(timeout()), &s, SLOT(advance()));
timer->start(50);
return a.exec();
}
|
STL: GNU ISO C++ Library, version 4.9.2
