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tdegames/kshisen/board.cpp

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22 KiB

/* Yo Emacs, this is -*- C++ -*-
*******************************************************************
*******************************************************************
*
*
* KSHISEN
*
*
*******************************************************************
*
* A japanese game similar to mahjongg
*
*******************************************************************
*
* created 1997 by Mario Weilguni <mweilguni@sime.com>
*
*******************************************************************
*
* This file is part of the KDE project "KSHISEN"
*
* KSHISEN is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* KSHISEN is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with KSHISEN; see the file COPYING. If not, write to
* the Free Software Foundation, 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*******************************************************************
*/
#include <kapplication.h>
#include <klocale.h>
#include <kstandarddirs.h>
#include <kglobalsettings.h>
#include <kdebug.h>
#include <qpainter.h>
#include <qpaintdevicemetrics.h>
#include <qtimer.h>
#include "board.h"
#include "prefs.h"
#define EMPTY 0
#define DEFAULTDELAY 500
#define DEFAULTSHUFFLE 4
static int size_x[5] = {14, 18, 24, 26, 30};
static int size_y[5] = { 6, 8, 12, 14, 16};
static int DELAY[5] = {1000, 750, 500, 250, 125};
Board::Board(QWidget *parent, const char *name) :
QWidget(parent, name, WResizeNoErase), field(0),
_x_tiles(0), _y_tiles(0),
_delay(125), paused(false),
gravity_flag(true), _solvable_flag(true),
grav_col_1(-1), grav_col_2(-1), highlighted_tile(-1)
{
// Randomize
setShuffle(DEFAULTSHUFFLE);
random.setSeed(0);
starttime = time((time_t *)0);
setDelay(DEFAULTDELAY);
_redo.setAutoDelete(true);
_undo.setAutoDelete(true);
QPixmap bg(KGlobal::dirs()->findResource("appdata", "kshisen_bgnd.png"));
setBackgroundPixmap(bg);
loadSettings();
}
Board::~Board()
{
delete [] field;
}
void Board::loadSettings(){
int index = Prefs::size();
setSize(size_x[index], size_y[index]);
setShuffle(Prefs::level() * 4 + 1);
setGravityFlag(Prefs::gravity());
setSolvableFlag(Prefs::solvable());
setDelay(DELAY[Prefs::speed()]);
}
int Board::x_tiles() const
{
return _x_tiles;
}
int Board::y_tiles() const
{
return _y_tiles;
}
void Board::setField(int x, int y, int value)
{
if(x < 0 || y < 0 || x >= x_tiles() || y >= y_tiles())
{
kdFatal() << "Attempted write to invalid field position "
"(" << x << ", " << y << ")" << endl;
}
field[y * x_tiles() + x] = value;
}
int Board::getField(int x, int y) const
{
#ifdef DEBUGGING
if(x < -1 || y < -1 || x > x_tiles() || y > y_tiles())
{
kdFatal() << "Attempted read from invalid field position "
"(" << x << ", " << y << ")" << endl;
}
#endif
if(x < 0 || y < 0 || x >= x_tiles() || y >= y_tiles())
return EMPTY;
return field[y * x_tiles() + x];
}
void Board::gravity(int col, bool update)
{
if(gravity_flag)
{
int rptr = y_tiles()-1, wptr = y_tiles()-1;
while(rptr >= 0)
{
if(getField(col, wptr) != EMPTY)
{
rptr--;
wptr--;
}
else
{
if(getField(col, rptr) != EMPTY)
{
setField(col, wptr, getField(col, rptr));
setField(col, rptr, EMPTY);
if(update)
{
updateField(col, rptr);
updateField(col, wptr);
}
wptr--;
rptr--;
}
else
rptr--;
}
}
}
}
void Board::mousePressEvent(QMouseEvent *e)
{
// Calculate field position
int pos_x = (e->pos().x() - xOffset()) / tiles.tileWidth();
int pos_y = (e->pos().y() - yOffset()) / tiles.tileHeight();
if(e->pos().x() < xOffset() || e->pos().y() < yOffset() ||
pos_x >= x_tiles() || pos_y >= y_tiles())
{
pos_x = -1;
pos_y = -1;
}
// Mark tile
if(e->button() == LeftButton)
{
clearHighlight();
if(pos_x != -1)
marked(pos_x, pos_y);
}
// Assist by highlighting all tiles of same type
if(e->button() == RightButton)
{
int clicked_tile = getField(pos_x, pos_y);
// Clear marked tile
if(mark_x != -1 && getField(mark_x, mark_y) != clicked_tile)
{
// We need to set mark_x and mark_y to -1 before calling
// updateField() to ensure the tile is redrawn as unmarked.
int oldmarkx = mark_x;
int oldmarky = mark_y;
mark_x = -1;
mark_y = -1;
updateField(oldmarkx, oldmarky, false);
}
else
{
mark_x = -1;
mark_y = -1;
}
// Perform highlighting
if(clicked_tile != highlighted_tile)
{
int old_highlighted = highlighted_tile;
highlighted_tile = clicked_tile;
for(int i = 0; i < x_tiles(); i++)
{
for(int j = 0; j < y_tiles(); j++)
{
const int field_tile = getField(i, j);
if(field_tile != EMPTY)
{
if(field_tile == old_highlighted)
updateField(i, j, false);
else if(field_tile == clicked_tile)
updateField(i, j, false);
}
}
}
}
}
}
// The board is centred inside the main playing area. xOffset/yOffset provide
// the coordinates of the top-left corner of the board.
int Board::xOffset() const
{
return (width() - (tiles.tileWidth() * x_tiles())) / 2;
}
int Board::yOffset() const
{
return (height() - (tiles.tileHeight() * y_tiles())) / 2;
}
void Board::setSize(int x, int y)
{
if(x == x_tiles() && y == y_tiles())
return;
if(field != 0)
delete [] field;
field = new int[ x * y ];
_x_tiles = x;
_y_tiles = y;
for(int i = 0; i < x; i++)
for(int j = 0; j < y; j++)
setField(i, j, EMPTY);
// set the minimum size of the scalable window
const double MINIMUM_SCALE = 0.2;
int w = qRound(tiles.unscaledTileWidth() * MINIMUM_SCALE) * x_tiles();
int h = qRound(tiles.unscaledTileHeight() * MINIMUM_SCALE) * y_tiles();
w += tiles.unscaledTileWidth();
h += tiles.unscaledTileWidth();
setMinimumSize(w, h);
resizeBoard();
newGame();
emit changed();
}
void Board::resizeEvent(QResizeEvent*)
{
resizeBoard();
emit resized();
}
void Board::resizeBoard()
{
// calculate tile size required to fit all tiles in the window
int w = static_cast<int>( static_cast<double>(width() - tiles.unscaledTileWidth()) / x_tiles() );
int h = static_cast<int>( static_cast<double>(height() - tiles.unscaledTileWidth()) / y_tiles() );
const double MAXIMUM_SCALE = 2.0;
w = std::min(w, static_cast<int>((tiles.unscaledTileWidth() * MAXIMUM_SCALE) + 0.5));
h = std::min(h, static_cast<int>((tiles.unscaledTileHeight() * MAXIMUM_SCALE) + 0.5));
tiles.resizeTiles(w, h);
}
QSize Board::unscaledSize() const
{
int w = tiles.unscaledTileWidth() * x_tiles() + tiles.unscaledTileWidth();
int h = tiles.unscaledTileHeight() * y_tiles() + tiles.unscaledTileWidth();
return QSize(w, h);
}
void Board::newGame()
{
//kdDebug() << "NewGame" << endl;
int i, x, y, k;
mark_x = -1;
mark_y = -1;
highlighted_tile = -1; // will clear previous highlight
_undo.clear();
_redo.clear();
connection.clear();
// distribute all tiles on board
int cur_tile = 1;
for(y = 0; y < y_tiles(); y += 4)
{
for(x = 0; x < x_tiles(); ++x)
{
for(k = 0; k < 4 && y + k < y_tiles(); k++)
setField(x, y + k, cur_tile);
cur_tile++;
if(cur_tile > TileSet::nTiles)
cur_tile = 1;
}
}
if(getShuffle() == 0)
{
update();
starttime = time((time_t *)0);
emit changed();
return;
}
// shuffle the field
int tx = x_tiles();
int ty = y_tiles();
for(i = 0; i < x_tiles() * y_tiles() * getShuffle(); i++)
{
int x1 = random.getLong(tx);
int y1 = random.getLong(ty);
int x2 = random.getLong(tx);
int y2 = random.getLong(ty);
int t = getField(x1, y1);
setField(x1, y1, getField(x2, y2));
setField(x2, y2, t);
}
// do not make solvable if _solvable_flag is false
if(!_solvable_flag)
{
update();
starttime = time((time_t *)0);
emit changed();
return;
}
int fsize = x_tiles() * y_tiles() * sizeof(int);
int *oldfield = new int[x_tiles() * y_tiles()];
memcpy(oldfield, field, fsize); // save field
int *tiles = new int[x_tiles() * y_tiles()];
int *pos = new int[x_tiles() * y_tiles()];
while(!solvable(true))
{
//kdDebug() << "Not solvable" << endl;
//dumpBoard();
// generate a list of free tiles and positions
int num_tiles = 0;
for(i = 0; i < x_tiles() * y_tiles(); i++)
if(field[i] != EMPTY)
{
pos[num_tiles] = i;
tiles[num_tiles] = field[i];
num_tiles++;
}
// restore field
memcpy(field, oldfield, fsize);
// redistribute unsolved tiles
while(num_tiles > 0)
{
// get a random tile
int r1 = random.getLong(num_tiles);
int r2 = random.getLong(num_tiles);
int tile = tiles[r1];
int apos = pos[r2];
// truncate list
tiles[r1] = tiles[num_tiles-1];
pos[r2] = pos[num_tiles-1];
num_tiles--;
// put this tile on the new position
field[apos] = tile;
}
// remember field
memcpy(oldfield, field, fsize);
}
// restore field
memcpy(field, oldfield, fsize);
delete tiles;
delete pos;
delete oldfield;
update();
starttime = time((time_t *)0);
emit changed();
}
bool Board::isTileHighlighted(int x, int y) const
{
if(x == mark_x && y == mark_y)
return true;
if(getField(x, y) == highlighted_tile)
return true;
if(!connection.empty())
{
if(x == connection.front().x && y == connection.front().y)
return true;
if(x == connection.back().x && y == connection.back().y)
return true;
}
return false;
}
void Board::updateField(int x, int y, bool erase)
{
QRect r(xOffset() + x * tiles.tileWidth(),
yOffset() + y * tiles.tileHeight(),
tiles.tileWidth(),
tiles.tileHeight());
repaint(r, erase);
}
void Board::paintEvent(QPaintEvent *e)
{
QRect ur = e->rect(); // rectangle to update
QPixmap pm(ur.size()); // Pixmap for double-buffering
pm.fill(this, ur.topLeft()); // fill with widget background
QPainter p(&pm);
p.translate(-ur.x(), -ur.y()); // use widget coordinate system
if(paused)
{
p.setFont(KGlobalSettings::largeFont());
p.drawText(rect(), Qt::AlignCenter, i18n("Game Paused"));
}
else
{
int w = tiles.tileWidth();
int h = tiles.tileHeight();
for(int i = 0; i < x_tiles(); i++)
{
for(int j = 0; j < y_tiles(); j++)
{
int tile = getField(i, j);
if(tile == EMPTY)
continue;
int xpos = xOffset() + i * w;
int ypos = yOffset() + j * h;
QRect r(xpos, ypos, w, h);
if(e->rect().intersects(r))
{
if(isTileHighlighted(i, j))
p.drawPixmap(xpos, ypos, tiles.highlightedTile(tile-1));
else
p.drawPixmap(xpos, ypos, tiles.tile(tile-1));
}
}
}
}
p.end();
bitBlt( this, ur.topLeft(), &pm );
}
void Board::marked(int x, int y)
{
// make sure that the previous connection is correctly undrawn
undrawConnection();
if(getField(x, y) == EMPTY)
return;
if(x == mark_x && y == mark_y)
{
// unmark the piece
mark_x = -1;
mark_y = -1;
updateField(x, y, false);
return;
}
if(mark_x == -1)
{
mark_x = x;
mark_y = y;
updateField(x, y, false);
return;
}
int fld1 = getField(mark_x, mark_y);
int fld2 = getField(x, y);
// both field same?
if(fld1 != fld2)
return;
// trace
if(findPath(mark_x, mark_y, x, y, connection))
{
madeMove(mark_x, mark_y, x, y);
drawConnection(getDelay());
setField(mark_x, mark_y, EMPTY);
setField(x, y, EMPTY);
grav_col_1 = x;
grav_col_2 = mark_x;
mark_x = -1;
mark_y = -1;
// game is over?
// Must delay until after tiles fall to make this test
// See undrawConnection GP.
}
else
{
connection.clear();
}
}
void Board::clearHighlight()
{
if(highlighted_tile != -1)
{
int old_highlight = highlighted_tile;
highlighted_tile = -1;
for(int i = 0; i < x_tiles(); i++)
for(int j = 0; j < y_tiles(); j++)
if(old_highlight == getField(i, j))
updateField(i, j, false);
}
}
// Can we make a path between two tiles with a single line?
bool Board::canMakePath(int x1, int y1, int x2, int y2) const
{
if(x1 == x2)
{
for(int i = std::min(y1, y2) + 1; i < std::max(y1, y2); i++)
if(getField(x1, i) != EMPTY)
return false;
return true;
}
if(y1 == y2)
{
for(int i = std::min(x1, x2) + 1; i < std::max(x1, x2); i++)
if(getField(i, y1) != EMPTY)
return false;
return true;
}
return false;
}
bool Board::findPath(int x1, int y1, int x2, int y2, Path& p) const
{
p.clear();
if(findSimplePath(x1, y1, x2, y2, p))
return true;
// Find a path of 3 segments
const int dx[4] = { 1, 0, -1, 0 };
const int dy[4] = { 0, 1, 0, -1 };
for(int i = 0; i < 4; i++)
{
int newx = x1 + dx[i];
int newy = y1 + dy[i];
while(newx >= -1 && newx <= x_tiles() &&
newy >= -1 && newy <= y_tiles() &&
getField(newx, newy) == EMPTY)
{
if(findSimplePath(newx, newy, x2, y2, p))
{
p.push_front(Position(x1, y1));
return true;
}
newx += dx[i];
newy += dy[i];
}
}
return false;
}
// Find a path of 1 or 2 segments between tiles. Returns whether
// a path was found, and if so, the path is returned via 'p'.
bool Board::findSimplePath(int x1, int y1, int x2, int y2, Path& p) const
{
// Find direct line (path of 1 segment)
if(canMakePath(x1, y1, x2, y2))
{
p.push_back(Position(x1, y1));
p.push_back(Position(x2, y2));
return true;
}
// If the tiles are in the same row or column, then a
// a 'simple path' cannot be found between them
if(x1 == x2 || y1 == y2)
return false;
// Find path of 2 segments (route A)
if(getField(x2, y1) == EMPTY && canMakePath(x1, y1, x2, y1) &&
canMakePath(x2, y1, x2, y2))
{
p.push_back(Position(x1, y1));
p.push_back(Position(x2, y1));
p.push_back(Position(x2, y2));
return true;
}
// Find path of 2 segments (route B)
if(getField(x1, y2) == EMPTY && canMakePath(x1, y1, x1, y2) &&
canMakePath(x1, y2, x2, y2))
{
p.push_back(Position(x1, y1));
p.push_back(Position(x1, y2));
p.push_back(Position(x2, y2));
return true;
}
return false;
}
void Board::drawConnection(int timeout)
{
if(connection.empty())
return;
// lighten the fields
updateField(connection.front().x, connection.front().y);
updateField(connection.back().x, connection.back().y);
QPainter p;
p.begin(this);
p.setPen(QPen(QColor("red"), tiles.lineWidth()));
// Path.size() will always be >= 2
Path::const_iterator pathEnd = connection.end();
Path::const_iterator pt1 = connection.begin();
Path::const_iterator pt2 = pt1;
++pt2;
while(pt2 != pathEnd)
{
p.drawLine( midCoord(pt1->x, pt1->y), midCoord(pt2->x, pt2->y) );
++pt1;
++pt2;
}
p.flush();
p.end();
QTimer::singleShot(timeout, this, SLOT(undrawConnection()));
}
void Board::undrawConnection()
{
if(grav_col_1 != -1 || grav_col_2 != -1)
{
gravity(grav_col_1, true);
gravity(grav_col_2, true);
grav_col_1 = -1;
grav_col_2 = -1;
}
// is already undrawn?
if(connection.empty())
return;
// Redraw all affected fields
Path oldConnection = connection;
connection.clear();
// Path.size() will always be >= 2
Path::const_iterator pathEnd = oldConnection.end();
Path::const_iterator pt1 = oldConnection.begin();
Path::const_iterator pt2 = pt1;
++pt2;
while(pt2 != pathEnd)
{
if(pt1->y == pt2->y)
{
for(int i = std::min(pt1->x, pt2->x); i <= std::max(pt1->x, pt2->x); i++)
updateField(i, pt1->y);
}
else
{
for(int i = std::min(pt1->y, pt2->y); i <= std::max(pt1->y, pt2->y); i++)
updateField(pt1->x, i);
}
++pt1;
++pt2;
}
Path dummyPath;
// game is over?
if(!getHint_I(dummyPath))
{
time_for_game = (int)difftime( time((time_t)0), starttime);
emit endOfGame();
}
}
QPoint Board::midCoord(int x, int y) const
{
QPoint p;
int w = tiles.tileWidth();
int h = tiles.tileHeight();
if(x == -1)
p.setX(xOffset() - (w / 4));
else if(x == x_tiles())
p.setX(xOffset() + (w * x_tiles()) + (w / 4));
else
p.setX(xOffset() + (w * x) + (w / 2));
if(y == -1)
p.setY(yOffset() - (w / 4));
else if(y == y_tiles())
p.setY(yOffset() + (h * y_tiles()) + (w / 4));
else
p.setY(yOffset() + (h * y) + (h / 2));
return p;
}
void Board::setDelay(int newvalue)
{
_delay = newvalue;
}
int Board::getDelay() const
{
return _delay;
}
void Board::madeMove(int x1, int y1, int x2, int y2)
{
Move *m = new Move(x1, y1, x2, y2, getField(x1, y1));
_undo.append(m);
while(_redo.count())
_redo.removeFirst();
emit changed();
}
bool Board::canUndo() const
{
return !_undo.isEmpty();
}
bool Board::canRedo() const
{
return !_redo.isEmpty();
}
void Board::undo()
{
if(canUndo())
{
clearHighlight();
undrawConnection();
Move* m = _undo.last();
_undo.take();
if(gravityFlag())
{
int y;
// When both tiles reside in the same column, the order of undo is
// significant (we must undo the lower tile first).
if(m->x1 == m->x2 && m->y1 < m->y2)
{
std::swap(m->x1, m->x2);
std::swap(m->y1, m->y2);
}
for(y = 0; y < m->y1; y++)
{
setField(m->x1, y, getField(m->x1, y+1));
updateField(m->x1, y);
}
for(y = 0; y < m->y2; y++)
{
setField(m->x2, y, getField(m->x2, y+1));
updateField(m->x2, y);
}
}
setField(m->x1, m->y1, m->tile);
setField(m->x2, m->y2, m->tile);
updateField(m->x1, m->y1);
updateField(m->x2, m->y2);
_redo.prepend(m);
emit changed();
}
}
void Board::redo()
{
if(canRedo())
{
clearHighlight();
undrawConnection();
Move* m = _redo.take(0);
setField(m->x1, m->y1, EMPTY);
setField(m->x2, m->y2, EMPTY);
updateField(m->x1, m->y1);
updateField(m->x2, m->y2);
gravity(m->x1, true);
gravity(m->x2, true);
_undo.append(m);
emit changed();
}
}
void Board::showHint()
{
undrawConnection();
if(getHint_I(connection))
drawConnection(1000);
}
#ifdef DEBUGGING
void Board::makeHintMove()
{
Path p;
if(getHint_I(p))
{
mark_x = -1;
mark_y = -1;
marked(p.front().x, p.front().y);
marked(p.back().x, p.back().y);
}
}
void Board::finish()
{
Path p;
bool ready=false;
while(!ready && getHint_I(p))
{
mark_x = -1;
mark_y = -1;
if(tilesLeft() == 2)
ready = true;
marked(p.front().x, p.front().y);
marked(p.back().x, p.back().y);
kapp->processEvents();
usleep(250*1000);
}
}
void Board::dumpBoard() const
{
kdDebug() << "Board contents:" << endl;
for(int y = 0; y < y_tiles(); ++y)
{
QString row;
for(int x = 0; x < x_tiles(); ++x)
{
int tile = getField(x, y);
if(tile == EMPTY)
row += " --";
else
row += QString("%1").arg(getField(x, y), 3);
}
kdDebug() << row << endl;
}
}
#endif
bool Board::getHint_I(Path& p) const
{
//dumpBoard();
short done[TileSet::nTiles];
for( short index = 0; index < TileSet::nTiles; index++ )
done[index] = 0;
for(int x = 0; x < x_tiles(); x++)
{
for(int y = 0; y < y_tiles(); y++)
{
int tile = getField(x, y);
if(tile != EMPTY && done[tile - 1] != 4)
{
// for all these types of tile search path's
for(int xx = 0; xx < x_tiles(); xx++)
{
for(int yy = 0; yy < y_tiles(); yy++)
{
if(xx != x || yy != y)
{
if(getField(xx, yy) == tile)
if(findPath(x, y, xx, yy, p))
{
//kdDebug() << "path.size() == " << p.size() << endl;
//for(Path::const_iterator i = p.begin(); i != p.end(); ++i)
// kdDebug() << "pathEntry: (" << i->x << ", " << i->y
// << ") => " << getField(i->x, i->y) << endl;
return true;
}
}
}
}
done[tile - 1]++;
}
}
}
return false;
}
void Board::setShuffle(int newvalue)
{
if(newvalue != _shuffle){
_shuffle = newvalue;
newGame();
}
}
int Board::getShuffle() const
{
return _shuffle;
}
int Board::tilesLeft() const
{
int left = 0;
for(int i = 0; i < x_tiles(); i++)
for(int j = 0; j < y_tiles(); j++)
if(getField(i, j) != EMPTY)
left++;
return left;
}
int Board::getCurrentTime() const
{
return (int)difftime(time((time_t *)0),starttime);
}
int Board::getTimeForGame() const
{
if(tilesLeft() == 0)
{
return time_for_game;
}
else
{
if(paused)
return (int)difftime(pause_start, starttime);
else
return (int)difftime(time((time_t *)0), starttime);
}
}
bool Board::solvable(bool norestore)
{
int *oldfield = 0;
if(!norestore)
{
oldfield = new int [x_tiles() * y_tiles()];
memcpy(oldfield, field, x_tiles() * y_tiles() * sizeof(int));
}
Path p;
while(getHint_I(p))
{
kdFatal(getField(p.front().x, p.front().y) != getField(p.back().x, p.back().y))
<< "Removing unmateched tiles: (" << p.front().x << ", " << p.front().y << ") => "
<< getField(p.front().x, p.front().y) << " (" << p.back().x << ", " << p.back().y << ") => "
<< getField(p.back().x, p.back().y) << endl;
setField(p.front().x, p.front().y, EMPTY);
setField(p.back().x, p.back().y, EMPTY);
//if(gravityFlag())
//{
// gravity(p.front().x, false);
// gravity(p.back().x, false);
//}
}
int left = tilesLeft();
if(!norestore)
{
memcpy(field, oldfield, x_tiles() * y_tiles() * sizeof(int));
delete [] oldfield;
}
return (bool)(left == 0);
}
bool Board::getSolvableFlag() const
{
return _solvable_flag;
}
void Board::setSolvableFlag(bool value)
{
if(value && !_solvable_flag && !solvable()){
_solvable_flag = value;
newGame();
}
else
_solvable_flag = value;
}
bool Board::gravityFlag() const
{
return gravity_flag;
}
void Board::setGravityFlag(bool b)
{
if( gravity_flag != b ){
if(canUndo() || canRedo())
newGame();
gravity_flag = b;
}
}
bool Board::pause()
{
paused = !paused;
if(paused)
pause_start = time((time_t *)0);
else
starttime += (time_t) difftime( time((time_t *)0), pause_start);
update();
return paused;
}
QSize Board::sizeHint() const
{
int dpi = QPaintDeviceMetrics(this).logicalDpiX();
if (dpi < 75)
dpi = 75;
return QSize(9*dpi,7*dpi);
}
#include "board.moc"