Raspbian 2 player chess game

Quantum1982

I want to add the pieces programmatically. I don't want to drag and drop labels onto the form. These pieces are going to be stored inside an array which will be loaded dynamically.

JonB

@Quantum1982
I know this.

I don't know how to explain any better. Drag & drop has never been discussed. I have told you what you need to do, but you have not done it. You really should read enough to understand how widgets work and how you place widgets onto other widgets/forms/windows; at present you do not know just how to put a label on. I suggested earlier that you should "take some time to look at some basic Qt widgets examples", up to you.

Quantum1982

Ok but the issue is getting the right code sample, not an abstract overview.

JonB

@Quantum1982
The code I gave you told you exactly what you need to do:

with the MainWindow as its parent: WhiteQueen = new QLabel(this).

You have chosen not to do anything about this, so there's not much point keep telling you. I'll leave you to it.

Quantum1982

Ok but why do you have to use a pointer ?

JonB

@Quantum1982 said in Raspbian 2 player chess game:

These pieces are going to be stored inside an array which will be loaded dynamically.

That's one reason. Another reason is there may be more than 1 white queen. Another reason is that you'll want to create pieces as you go.

If you don't want to use a pointer, set its parent in the header file, or via setParent(). Or when you add it properly onto the form, such as onto MainWindow's centralWidget(), which you are not doing at the moment anyway, so it will appear in an odd place.

Quantum1982

Can you show me exactly where in the code these changes need to be made ?

JonB

@Quantum1982
.h file:

public:
    QLabel *WhiteQueen;

.cpp file, in MainWindow::MainWindow()

// QLabel WhiteQueen; --- instead of that line the following one:
WhiteQueen = new QLabel(this);

Quantum1982

Thank you very much. It is working now.

Quantum1982

Although the next stage is decide what mechanism to use to draw a checkered board.

Quantum1982

Ok I am making progress. This is the output so far :!

Do you have any idea why the last column and row is being stretched ?

Quantum1982

Sorry here is the code :
#include "mainwindow.h"
#include "ui_mainwindow.h"

#include <QImage>
#include <QLabel>

MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
scene = new QGraphicsScene(this);
ui->graphicsView->setScene(scene);

QBrush greenBrush(Qt::green);
QBrush blueBrush(Qt::blue);
QPen outlinePen(Qt::black);
outlinePen.setWidth(2);

for (int i=0;i<8;i++)
    for (int j=0;j<8;j++)
        if ((i+j)%2==0)
        rectangle = scene->addRect(BOARD_X1+(i*SQUARE_WIDTH),BOARD_Y1+(j*SQUARE_HEIGHT)
                                   ,BOARD_X1+(i*SQUARE_WIDTH)+SQUARE_WIDTH ,
                                   BOARD_Y1+(j*SQUARE_HEIGHT)+SQUARE_HEIGHT, outlinePen, blueBrush);
        else rectangle = scene->addRect(BOARD_X1+(i*SQUARE_WIDTH),BOARD_Y1+(j*SQUARE_HEIGHT)
                                        ,BOARD_X1+(i*SQUARE_WIDTH)+SQUARE_WIDTH ,
                                        BOARD_Y1+(j*SQUARE_HEIGHT)+SQUARE_HEIGHT, outlinePen, greenBrush);


QString ChessPieces[12];

ChessPieces[0] = "C:/Users/User/Desktop/WhitePawn.jpg";
ChessPieces[1] = "C:/Users/User/Desktop/WhiteRook.jpg";
ChessPieces[2] = "C:/Users/User/Desktop/WhiteKnight.jpg";
ChessPieces[3] = "C:/Users/User/Desktop/WhiteBishop.jpg";
ChessPieces[4] = "C:/Users/User/Desktop/WhiteQueen.jpg";
ChessPieces[5] = "C:/Users/User/Desktop/WhiteKing.jpg";
ChessPieces[6] = "C:/Users/User/Desktop/BlackPawn.jpg";
ChessPieces[7] = "C:/Users/User/Desktop/BlackRook.jpg";
ChessPieces[8] = "C:/Users/User/Desktop/BlackKnight.jpg";
ChessPieces[9] = "C:/Users/User/Desktop/BlackBishop.jpg";
ChessPieces[10] = "C:/Users/User/Desktop/BlackQueen.jpg";
ChessPieces[11] = "C:/Users/User/Desktop/BlackKing.jpg";

QPixmap Pixmap("C:/Users/User/Desktop/WhiteQueen.jpg");
WhiteQueen = new QLabel(this);

WhiteQueen->setGeometry(50,50,100,100);
WhiteQueen->setPixmap(Pixmap);

}

MainWindow::~MainWindow()
{
delete ui;
}

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#define BOARD_X1 20
#define BOARD_Y1 20
#define SQUARE_WIDTH 50
#define SQUARE_HEIGHT 50

#include <QMainWindow>
#include <QGraphicsView>
#include <QGraphicsItem>
#include <QLabel>

class CChessBoard : public QGraphicsView
{
public:

};

QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
Q_OBJECT

public:
QLabel *WhiteQueen;
MainWindow(QWidget *parent = nullptr);
~MainWindow();

private:
Ui::MainWindow *ui;
QGraphicsScene *scene;
QGraphicsRectItem *rectangle;
};
#endif // MAINWINDOW_H

SGaist

Are you doing anything else with rectangle ?

Since you are using the graphics view framework, why are you using QLabel for your chess pieces ?

Quantum1982

Well can I use an array of QImages instead ?

SGaist

QGraphicsPixmapItem

You really should take the time to explore the documentation.

Quantum1982

Yeah QGraphicsPixmapItem solves the problem

Quantum1982

I am having a problem loading multiple pixmaps ?

#include "mainwindow.h"
#include "ui_mainwindow.h"

#include <QImage>
#include <QLabel>

MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
scene = new QGraphicsScene(this);
ui->graphicsView->setScene(scene);

QBrush greenBrush(Qt::green);
QBrush blueBrush(Qt::blue);
QPen outlinePen(Qt::black);
outlinePen.setWidth(2);

for (int i=0;i<8;i++)
    for (int j=0;j<8;j++)
        if ((i+j)%2==0)
        rectangle = scene->addRect(BOARD_X1+(i*SQUARE_WIDTH),BOARD_Y1+(j*SQUARE_HEIGHT)
                                   ,BOARD_X1+(i*SQUARE_WIDTH)+SQUARE_WIDTH ,
                                   BOARD_Y1+(j*SQUARE_HEIGHT)+SQUARE_HEIGHT, outlinePen, blueBrush);
        else rectangle = scene->addRect(BOARD_X1+(i*SQUARE_WIDTH),BOARD_Y1+(j*SQUARE_HEIGHT)
                                        ,BOARD_X1+(i*SQUARE_WIDTH)+SQUARE_WIDTH ,
                                        BOARD_Y1+(j*SQUARE_HEIGHT)+SQUARE_HEIGHT, outlinePen, greenBrush);


QString ChessPieces[12];

ChessPieces[0] = "C:/Users/User/Desktop/WhitePawn.jpg";
ChessPieces[1] = "C:/Users/User/Desktop/WhiteRook.jpg";
ChessPieces[2] = "C:/Users/User/Desktop/WhiteKnight.jpg";
ChessPieces[3] = "C:/Users/User/Desktop/WhiteBishop.jpg";
ChessPieces[4] = "C:/Users/User/Desktop/WhiteQueen.jpg";
ChessPieces[5] = "C:/Users/User/Desktop/WhiteKing.jpg";
ChessPieces[6] = "C:/Users/User/Desktop/BlackPawn.jpg";
ChessPieces[7] = "C:/Users/User/Desktop/BlackRook.jpg";
ChessPieces[8] = "C:/Users/User/Desktop/BlackKnight.jpg";
ChessPieces[9] = "C:/Users/User/Desktop/BlackBishop.jpg";
ChessPieces[10] = "C:/Users/User/Desktop/BlackQueen.jpg";
ChessPieces[11] = "C:/Users/User/Desktop/BlackKing.jpg";

for (int i=0;i<8;i++)
    ChessPieceIndexes[i][1] = 0; // White Pawns
ChessPieceIndexes[0][0] = 1; // White Rook
ChessPieceIndexes[7][0] = 1; // White Rook

ChessPieceIndexes[1][0] = 2; // White Knight
ChessPieceIndexes[7][0] = 2; // White Knight

ChessPieceIndexes[2][0] = 3; // White Bishop
ChessPieceIndexes[6][0] = 3; // White Bishop

ChessPieceIndexes[3][0] = 4; // White Queen
ChessPieceIndexes[4][0] = 5; // White King


/*
WhiteQueen = new QLabel(this);

WhiteQueen->setGeometry(BOARD_X1+4*SQUARE_WIDTH,BOARD_Y1+4*SQUARE_HEIGHT,
                        BOARD_X1+4*SQUARE_WIDTH+SQUARE_WIDTH,BOARD_Y1+4*SQUARE_HEIGHT+SQUARE_HEIGHT);
WhiteQueen->setPixmap(Pixmap);
*/

QPixmap Pixmap(ChessPieces[0]); // White Pawn

for (int i=0;i<8;i++)
{
    QGraphicsPixmapItem* item = new QGraphicsPixmapItem(Pixmap);
    item->setPos(BOARD_X1+(i*SQUARE_WIDTH),BOARD_Y1+(7*SQUARE_HEIGHT));
    scene->addItem(item);
}
// White Rooks
Pixmap.load(ChessPieces[1]);
QGraphicsPixmapItem* item = new QGraphicsPixmapItem(Pixmap);
item->setPos(BOARD_X1+(0*SQUARE_WIDTH),BOARD_Y1+(8*SQUARE_HEIGHT));
scene->addItem(item);

//QGraphicsPixmapItem* item = new QGraphicsPixmapItem(Pixmap);
item->setPos(BOARD_X1+(7*SQUARE_WIDTH),BOARD_Y1+(8*SQUARE_HEIGHT));
scene->addItem(item);

// White Knights
Pixmap.load(ChessPieces[2]);
//QGraphicsPixmapItem* item = new QGraphicsPixmapItem(Pixmap);
item->setPos(BOARD_X1+(1*SQUARE_WIDTH),BOARD_Y1+(8*SQUARE_HEIGHT));
scene->addItem(item);

}

MainWindow::~MainWindow()
{
delete ui;
}

JonB

@Quantum1982 said in Raspbian 2 player chess game:

Yeah QGraphicsPixmapItem solves the problem

Which is why I wrote earlier:

I'm not sure I would do this whole chess UI with widgets, probably a graphics scene with QGraphicsPixmapItems instead, but that's a whole different matter.

I am having a problem loading multiple pixmaps ?

I'm not following your code --- what is your problem?

Quantum1982

It's not adding the pixmapitems correctly. It adds the pawns but not the rooks ?

JonB

@Quantum1982
Check the return result from Pixmap.load(ChessPieces[1]);? And when developing code at least check the return result of every function which returns one, always, if only with a Q_ASSERT(false) in the failure case.