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qt3/examples/canvas/canvas.cpp

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#include <qdatetime.h>
#include <qmainwindow.h>
#include <qstatusbar.h>
#include <qmessagebox.h>
#include <qmenubar.h>
#include <qapplication.h>
#include <qpainter.h>
#include <qprinter.h>
#include <qlabel.h>
#include <qimage.h>
#include <qprogressdialog.h>
#include "canvas.h"
#include <stdlib.h>
// We use a global variable to save memory - all the brushes and pens in
// the mesh are shared.
static QBrush *tb = 0;
static QPen *tp = 0;
class EdgeItem;
class NodeItem;
class EdgeItem: public QCanvasLine
{
public:
EdgeItem( NodeItem*, NodeItem*, QCanvas *canvas );
void setFromPoint( int x, int y ) ;
void setToPoint( int x, int y );
static int count() { return c; }
void moveBy(double dx, double dy);
private:
static int c;
};
static const int imageRTTI = 984376;
class ImageItem: public QCanvasRectangle
{
public:
ImageItem( QImage img, QCanvas *canvas );
int rtti () const { return imageRTTI; }
bool hit( const QPoint&) const;
protected:
void drawShape( QPainter & );
private:
QImage image;
QPixmap pixmap;
};
ImageItem::ImageItem( QImage img, QCanvas *canvas )
: QCanvasRectangle( canvas ), image(img)
{
setSize( image.width(), image.height() );
#if !defined(Q_WS_QWS)
pixmap.convertFromImage(image, OrderedAlphaDither);
#endif
}
void ImageItem::drawShape( QPainter &p )
{
// On Qt/Embedded, we can paint a QImage as fast as a QPixmap,
// but on other platforms, we need to use a QPixmap.
#if defined(Q_WS_QWS)
p.drawImage( int(x()), int(y()), image, 0, 0, -1, -1, OrderedAlphaDither );
#else
p.drawPixmap( int(x()), int(y()), pixmap );
#endif
}
bool ImageItem::hit( const QPoint &p ) const
{
int ix = p.x()-int(x());
int iy = p.y()-int(y());
if ( !image.valid( ix , iy ) )
return FALSE;
QRgb pixel = image.pixel( ix, iy );
return qAlpha( pixel ) != 0;
}
class NodeItem: public QCanvasEllipse
{
public:
NodeItem( QCanvas *canvas );
~NodeItem() {}
void addInEdge( EdgeItem *edge ) { inList.append( edge ); }
void addOutEdge( EdgeItem *edge ) { outList.append( edge ); }
void moveBy(double dx, double dy);
// QPoint center() { return boundingRect().center(); }
private:
QPtrList<EdgeItem> inList;
QPtrList<EdgeItem> outList;
};
int EdgeItem::c = 0;
void EdgeItem::moveBy(double, double)
{
//nothing
}
EdgeItem::EdgeItem( NodeItem *from, NodeItem *to, QCanvas *canvas )
: QCanvasLine( canvas )
{
c++;
setPen( *tp );
setBrush( *tb );
from->addOutEdge( this );
to->addInEdge( this );
setPoints( int(from->x()), int(from->y()), int(to->x()), int(to->y()) );
setZ( 127 );
}
void EdgeItem::setFromPoint( int x, int y )
{
setPoints( x,y, endPoint().x(), endPoint().y() );
}
void EdgeItem::setToPoint( int x, int y )
{
setPoints( startPoint().x(), startPoint().y(), x, y );
}
void NodeItem::moveBy(double dx, double dy)
{
QCanvasEllipse::moveBy( dx, dy );
QPtrListIterator<EdgeItem> it1( inList );
EdgeItem *edge;
while (( edge = it1.current() )) {
++it1;
edge->setToPoint( int(x()), int(y()) );
}
QPtrListIterator<EdgeItem> it2( outList );
while (( edge = it2.current() )) {
++it2;
edge->setFromPoint( int(x()), int(y()) );
}
}
NodeItem::NodeItem( QCanvas *canvas )
: QCanvasEllipse( 6, 6, canvas )
{
setPen( *tp );
setBrush( *tb );
setZ( 128 );
}
FigureEditor::FigureEditor(
QCanvas& c, QWidget* parent,
const char* name, WFlags f) :
QCanvasView(&c,parent,name,f)
{
}
void FigureEditor::contentsMousePressEvent(QMouseEvent* e)
{
QPoint p = inverseWorldMatrix().map(e->pos());
QCanvasItemList l=canvas()->collisions(p);
for (QCanvasItemList::Iterator it=l.begin(); it!=l.end(); ++it) {
if ( (*it)->rtti() == imageRTTI ) {
ImageItem *item= (ImageItem*)(*it);
if ( !item->hit( p ) )
continue;
}
moving = *it;
moving_start = p;
return;
}
moving = 0;
}
void FigureEditor::clear()
{
QCanvasItemList list = canvas()->allItems();
QCanvasItemList::Iterator it = list.begin();
for (; it != list.end(); ++it) {
if ( *it )
delete *it;
}
}
void FigureEditor::contentsMouseMoveEvent(QMouseEvent* e)
{
if ( moving ) {
QPoint p = inverseWorldMatrix().map(e->pos());
moving->moveBy(p.x() - moving_start.x(),
p.y() - moving_start.y());
moving_start = p;
canvas()->update();
}
}
BouncyLogo::BouncyLogo(QCanvas* canvas) :
QCanvasSprite(0,canvas)
{
static QCanvasPixmapArray logo("qt-trans.xpm");
setSequence(&logo);
setAnimated(TRUE);
initPos();
}
const int logo_rtti = 1234;
int BouncyLogo::rtti() const
{
return logo_rtti;
}
void BouncyLogo::initPos()
{
initSpeed();
int trial=1000;
do {
move(rand()%canvas()->width(),rand()%canvas()->height());
advance(0);
} while (trial-- && xVelocity()==0.0 && yVelocity()==0.0);
}
void BouncyLogo::initSpeed()
{
const double speed = 4.0;
double d = (double)(rand()%1024) / 1024.0;
setVelocity( d*speed*2-speed, (1-d)*speed*2-speed );
}
void BouncyLogo::advance(int stage)
{
switch ( stage ) {
case 0: {
double vx = xVelocity();
double vy = yVelocity();
if ( vx == 0.0 && vy == 0.0 ) {
// stopped last turn
initSpeed();
vx = xVelocity();
vy = yVelocity();
}
double nx = x() + vx;
double ny = y() + vy;
if ( nx < 0 || nx >= canvas()->width() )
vx = -vx;
if ( ny < 0 || ny >= canvas()->height() )
vy = -vy;
for (int bounce=0; bounce<4; bounce++) {
QCanvasItemList l=collisions(FALSE);
for (QCanvasItemList::Iterator it=l.begin(); it!=l.end(); ++it) {
QCanvasItem *hit = *it;
if ( hit->rtti()==logo_rtti && hit->collidesWith(this) ) {
switch ( bounce ) {
case 0:
vx = -vx;
break;
case 1:
vy = -vy;
vx = -vx;
break;
case 2:
vx = -vx;
break;
case 3:
// Stop for this turn
vx = 0;
vy = 0;
break;
}
setVelocity(vx,vy);
break;
}
}
}
if ( x()+vx < 0 || x()+vx >= canvas()->width() )
vx = 0;
if ( y()+vy < 0 || y()+vy >= canvas()->height() )
vy = 0;
setVelocity(vx,vy);
} break;
case 1:
QCanvasItem::advance(stage);
break;
}
}
static uint mainCount = 0;
static QImage *butterflyimg;
static QImage *logoimg;
Main::Main(QCanvas& c, QWidget* parent, const char* name, WFlags f) :
QMainWindow(parent,name,f),
canvas(c)
{
editor = new FigureEditor(canvas,this);
QMenuBar* menu = menuBar();
QPopupMenu* file = new QPopupMenu( menu );
file->insertItem("&Fill canvas", this, SLOT(init()), CTRL+Key_F);
file->insertItem("&Erase canvas", this, SLOT(clear()), CTRL+Key_E);
file->insertItem("&New view", this, SLOT(newView()), CTRL+Key_N);
file->insertSeparator();
file->insertItem("&Print...", this, SLOT(print()), CTRL+Key_P);
file->insertSeparator();
file->insertItem("E&xit", qApp, SLOT(quit()), CTRL+Key_Q);
menu->insertItem("&File", file);
QPopupMenu* edit = new QPopupMenu( menu );
edit->insertItem("Add &Circle", this, SLOT(addCircle()), ALT+Key_C);
edit->insertItem("Add &Hexagon", this, SLOT(addHexagon()), ALT+Key_H);
edit->insertItem("Add &Polygon", this, SLOT(addPolygon()), ALT+Key_P);
edit->insertItem("Add Spl&ine", this, SLOT(addSpline()), ALT+Key_I);
edit->insertItem("Add &Text", this, SLOT(addText()), ALT+Key_T);
edit->insertItem("Add &Line", this, SLOT(addLine()), ALT+Key_L);
edit->insertItem("Add &Rectangle", this, SLOT(addRectangle()), ALT+Key_R);
edit->insertItem("Add &Sprite", this, SLOT(addSprite()), ALT+Key_S);
edit->insertItem("Create &Mesh", this, SLOT(addMesh()), ALT+Key_M );
edit->insertItem("Add &Alpha-blended image", this, SLOT(addButterfly()), ALT+Key_A);
menu->insertItem("&Edit", edit);
QPopupMenu* view = new QPopupMenu( menu );
view->insertItem("&Enlarge", this, SLOT(enlarge()), SHIFT+CTRL+Key_Plus);
view->insertItem("Shr&ink", this, SLOT(shrink()), SHIFT+CTRL+Key_Minus);
view->insertSeparator();
view->insertItem("&Rotate clockwise", this, SLOT(rotateClockwise()), CTRL+Key_PageDown);
view->insertItem("Rotate &counterclockwise", this, SLOT(rotateCounterClockwise()), CTRL+Key_PageUp);
view->insertItem("&Zoom in", this, SLOT(zoomIn()), CTRL+Key_Plus);
view->insertItem("Zoom &out", this, SLOT(zoomOut()), CTRL+Key_Minus);
view->insertItem("Translate left", this, SLOT(moveL()), CTRL+Key_Left);
view->insertItem("Translate right", this, SLOT(moveR()), CTRL+Key_Right);
view->insertItem("Translate up", this, SLOT(moveU()), CTRL+Key_Up);
view->insertItem("Translate down", this, SLOT(moveD()), CTRL+Key_Down);
view->insertItem("&Mirror", this, SLOT(mirror()), CTRL+Key_Home);
menu->insertItem("&View", view);
options = new QPopupMenu( menu );
dbf_id = options->insertItem("Double buffer", this, SLOT(toggleDoubleBuffer()));
options->setItemChecked(dbf_id, TRUE);
menu->insertItem("&Options",options);
menu->insertSeparator();
QPopupMenu* help = new QPopupMenu( menu );
help->insertItem("&About", this, SLOT(help()), Key_F1);
help->setItemChecked(dbf_id, TRUE);
menu->insertItem("&Help",help);
statusBar();
setCentralWidget(editor);
printer = 0;
init();
}
void Main::init()
{
clear();
static int r=24;
srand(++r);
mainCount++;
butterflyimg = 0;
logoimg = 0;
int i;
for ( i=0; i<canvas.width() / 56; i++) {
addButterfly();
}
for ( i=0; i<canvas.width() / 85; i++) {
addHexagon();
}
for ( i=0; i<canvas.width() / 128; i++) {
addLogo();
}
}
Main::~Main()
{
delete printer;
if ( !--mainCount ) {
delete[] butterflyimg;
butterflyimg = 0;
delete[] logoimg;
logoimg = 0;
}
}
void Main::newView()
{
// Open a new view... have it delete when closed.
Main *m = new Main(canvas, 0, 0, WDestructiveClose);
qApp->setMainWidget(m);
m->show();
qApp->setMainWidget(0);
}
void Main::clear()
{
editor->clear();
}
void Main::help()
{
static QMessageBox* about = new QMessageBox( "Qt Canvas Example",
"<h3>The QCanvas classes example</h3>"
"<ul>"
"<li> Press ALT-S for some sprites."
"<li> Press ALT-C for some circles."
"<li> Press ALT-L for some lines."
"<li> Drag the objects around."
"<li> Read the code!"
"</ul>", QMessageBox::Information, 1, 0, 0, this, 0, FALSE );
about->setButtonText( 1, "Dismiss" );
about->show();
}
void Main::aboutQt()
{
QMessageBox::aboutQt( this, "Qt Canvas Example" );
}
void Main::toggleDoubleBuffer()
{
bool s = !options->isItemChecked(dbf_id);
options->setItemChecked(dbf_id,s);
canvas.setDoubleBuffering(s);
}
void Main::enlarge()
{
canvas.resize(canvas.width()*4/3, canvas.height()*4/3);
}
void Main::shrink()
{
canvas.resize(canvas.width()*3/4, canvas.height()*3/4);
}
void Main::rotateClockwise()
{
QWMatrix m = editor->worldMatrix();
m.rotate( 22.5 );
editor->setWorldMatrix( m );
}
void Main::rotateCounterClockwise()
{
QWMatrix m = editor->worldMatrix();
m.rotate( -22.5 );
editor->setWorldMatrix( m );
}
void Main::zoomIn()
{
QWMatrix m = editor->worldMatrix();
m.scale( 2.0, 2.0 );
editor->setWorldMatrix( m );
}
void Main::zoomOut()
{
QWMatrix m = editor->worldMatrix();
m.scale( 0.5, 0.5 );
editor->setWorldMatrix( m );
}
void Main::mirror()
{
QWMatrix m = editor->worldMatrix();
m.scale( -1, 1 );
editor->setWorldMatrix( m );
}
void Main::moveL()
{
QWMatrix m = editor->worldMatrix();
m.translate( -16, 0 );
editor->setWorldMatrix( m );
}
void Main::moveR()
{
QWMatrix m = editor->worldMatrix();
m.translate( +16, 0 );
editor->setWorldMatrix( m );
}
void Main::moveU()
{
QWMatrix m = editor->worldMatrix();
m.translate( 0, -16 );
editor->setWorldMatrix( m );
}
void Main::moveD()
{
QWMatrix m = editor->worldMatrix();
m.translate( 0, +16 );
editor->setWorldMatrix( m );
}
void Main::print()
{
if ( !printer ) printer = new QPrinter;
if ( printer->setup(this) ) {
QPainter pp(printer);
canvas.drawArea(QRect(0,0,canvas.width(),canvas.height()),&pp,FALSE);
}
}
void Main::addSprite()
{
QCanvasItem* i = new BouncyLogo(&canvas);
i->setZ(rand()%256);
i->show();
}
QString butterfly_fn;
QString logo_fn;
void Main::addButterfly()
{
if ( butterfly_fn.isEmpty() )
return;
if ( !butterflyimg ) {
butterflyimg = new QImage[4];
butterflyimg[0].load( butterfly_fn );
butterflyimg[1] = butterflyimg[0].smoothScale( int(butterflyimg[0].width()*0.75),
int(butterflyimg[0].height()*0.75) );
butterflyimg[2] = butterflyimg[0].smoothScale( int(butterflyimg[0].width()*0.5),
int(butterflyimg[0].height()*0.5) );
butterflyimg[3] = butterflyimg[0].smoothScale( int(butterflyimg[0].width()*0.25),
int(butterflyimg[0].height()*0.25) );
}
QCanvasPolygonalItem* i = new ImageItem(butterflyimg[rand()%4],&canvas);
i->move(rand()%(canvas.width()-butterflyimg->width()),
rand()%(canvas.height()-butterflyimg->height()));
i->setZ(rand()%256+250);
i->show();
}
void Main::addLogo()
{
if ( logo_fn.isEmpty() )
return;
if ( !logoimg ) {
logoimg = new QImage[4];
logoimg[0].load( logo_fn );
logoimg[1] = logoimg[0].smoothScale( int(logoimg[0].width()*0.75),
int(logoimg[0].height()*0.75) );
logoimg[2] = logoimg[0].smoothScale( int(logoimg[0].width()*0.5),
int(logoimg[0].height()*0.5) );
logoimg[3] = logoimg[0].smoothScale( int(logoimg[0].width()*0.25),
int(logoimg[0].height()*0.25) );
}
QCanvasPolygonalItem* i = new ImageItem(logoimg[rand()%4],&canvas);
i->move(rand()%(canvas.width()-logoimg->width()),
rand()%(canvas.height()-logoimg->width()));
i->setZ(rand()%256+256);
i->show();
}
void Main::addCircle()
{
QCanvasPolygonalItem* i = new QCanvasEllipse(50,50,&canvas);
i->setBrush( QColor(rand()%32*8,rand()%32*8,rand()%32*8) );
i->move(rand()%canvas.width(),rand()%canvas.height());
i->setZ(rand()%256);
i->show();
}
void Main::addHexagon()
{
QCanvasPolygon* i = new QCanvasPolygon(&canvas);
const int size = canvas.width() / 25;
QPointArray pa(6);
pa[0] = QPoint(2*size,0);
pa[1] = QPoint(size,-size*173/100);
pa[2] = QPoint(-size,-size*173/100);
pa[3] = QPoint(-2*size,0);
pa[4] = QPoint(-size,size*173/100);
pa[5] = QPoint(size,size*173/100);
i->setPoints(pa);
i->setBrush( QColor(rand()%32*8,rand()%32*8,rand()%32*8) );
i->move(rand()%canvas.width(),rand()%canvas.height());
i->setZ(rand()%256);
i->show();
}
void Main::addPolygon()
{
QCanvasPolygon* i = new QCanvasPolygon(&canvas);
const int size = canvas.width()/2;
QPointArray pa(6);
pa[0] = QPoint(0,0);
pa[1] = QPoint(size,size/5);
pa[2] = QPoint(size*4/5,size);
pa[3] = QPoint(size/6,size*5/4);
pa[4] = QPoint(size*3/4,size*3/4);
pa[5] = QPoint(size*3/4,size/4);
i->setPoints(pa);
i->setBrush( QColor(rand()%32*8,rand()%32*8,rand()%32*8) );
i->move(rand()%canvas.width(),rand()%canvas.height());
i->setZ(rand()%256);
i->show();
}
void Main::addSpline()
{
QCanvasSpline* i = new QCanvasSpline(&canvas);
const int size = canvas.width()/6;
QPointArray pa(12);
pa[0] = QPoint(0,0);
pa[1] = QPoint(size/2,0);
pa[2] = QPoint(size,size/2);
pa[3] = QPoint(size,size);
pa[4] = QPoint(size,size*3/2);
pa[5] = QPoint(size/2,size*2);
pa[6] = QPoint(0,size*2);
pa[7] = QPoint(-size/2,size*2);
pa[8] = QPoint(size/4,size*3/2);
pa[9] = QPoint(0,size);
pa[10]= QPoint(-size/4,size/2);
pa[11]= QPoint(-size/2,0);
i->setControlPoints(pa);
i->setBrush( QColor(rand()%32*8,rand()%32*8,rand()%32*8) );
i->move(rand()%canvas.width(),rand()%canvas.height());
i->setZ(rand()%256);
i->show();
}
void Main::addText()
{
QCanvasText* i = new QCanvasText(&canvas);
i->setText("QCanvasText");
i->move(rand()%canvas.width(),rand()%canvas.height());
i->setZ(rand()%256);
i->show();
}
void Main::addLine()
{
QCanvasLine* i = new QCanvasLine(&canvas);
i->setPoints( rand()%canvas.width(), rand()%canvas.height(),
rand()%canvas.width(), rand()%canvas.height() );
i->setPen( QPen(QColor(rand()%32*8,rand()%32*8,rand()%32*8), 6) );
i->setZ(rand()%256);
i->show();
}
void Main::addMesh()
{
int x0 = 0;
int y0 = 0;
if ( !tb ) tb = new QBrush( Qt::red );
if ( !tp ) tp = new QPen( Qt::black );
int nodecount = 0;
int w = canvas.width();
int h = canvas.height();
const int dist = 30;
int rows = h / dist;
int cols = w / dist;
#ifndef QT_NO_PROGRESSDIALOG
QProgressDialog progress( "Creating mesh...", "Abort", rows,
this, "progress", TRUE );
#endif
QMemArray<NodeItem*> lastRow(cols);
for ( int j = 0; j < rows; j++ ) {
int n = j%2 ? cols-1 : cols;
NodeItem *prev = 0;
for ( int i = 0; i < n; i++ ) {
NodeItem *el = new NodeItem( &canvas );
nodecount++;
int r = rand();
int xrand = r %20;
int yrand = (r/20) %20;
el->move( xrand + x0 + i*dist + (j%2 ? dist/2 : 0 ),
yrand + y0 + j*dist );
if ( j > 0 ) {
if ( i < cols-1 )
(new EdgeItem( lastRow[i], el, &canvas ))->show();
if ( j%2 )
(new EdgeItem( lastRow[i+1], el, &canvas ))->show();
else if ( i > 0 )
(new EdgeItem( lastRow[i-1], el, &canvas ))->show();
}
if ( prev ) {
(new EdgeItem( prev, el, &canvas ))->show();
}
if ( i > 0 ) lastRow[i-1] = prev;
prev = el;
el->show();
}
lastRow[n-1]=prev;
#ifndef QT_NO_PROGRESSDIALOG
progress.setProgress( j );
if ( progress.wasCancelled() )
break;
#endif
}
#ifndef QT_NO_PROGRESSDIALOG
progress.setProgress( rows );
#endif
// qDebug( "%d nodes, %d edges", nodecount, EdgeItem::count() );
}
void Main::addRectangle()
{
QCanvasPolygonalItem *i = new QCanvasRectangle( rand()%canvas.width(),rand()%canvas.height(),
canvas.width()/5,canvas.width()/5,&canvas);
int z = rand()%256;
i->setBrush( QColor(z,z,z) );
i->setPen( QPen(QColor(rand()%32*8,rand()%32*8,rand()%32*8), 6) );
i->setZ(z);
i->show();
}
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