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  1. #1
    Join Date
    Sep 2019
    Posts
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    Qt products
    Qt5
    Platforms
    Windows

    Question mouse pos() returns wrong position

    Hello !,
    So i have a problem getting pos from the point where i click on the mouse ( using right click )
    check this video :
    https://streamable.com/cjo0d
    - Here you can see at the beginning i try moving him around using right click on the mouse and it's all working fine. But when i reach the land or at least when im near it the returned position is completely different as i expected it to be...
    you can see when i print the character current position and the positioning of the mouse ( when i press right click ) in the debug console it gives me wrong coordinates ( from the mouse ) and i don't know why... Sea and Land are two different QGraphicsPixmapItems both have their own class, so maybe it has to do something with that ?
    Here is the main class code:

    Game.h:

    Qt Code:
    1. #ifndef GAME_H
    2. #define GAME_H
    3. #include "player.h"
    4. #include "button.h"
    5. #include "sea.h"
    6. #include "land.h"
    7.  
    8. #include <QGraphicsView>
    9. #include <QGraphicsScene>
    10. #include <QObject>
    11. #include <QMouseEvent>
    12. #include <QGraphicsSceneMouseEvent>
    13. #include <QGraphicsScene>
    14. #include <QWidget>
    15. #include <QKeyEvent>
    16.  
    17. class Game: public QGraphicsView{
    18. Q_OBJECT
    19. public:
    20. // this class stuff
    21. static QString in_room;
    22. Game(QWidget *parent=NULL);
    23. void menu();
    24. void createMap();
    25. void createPlayer();
    26. QPixmap darkenImage(QString image, float num);
    27.  
    28. // other class stuff
    29. Player *player;
    30. Button *startButton;
    31. Button *quitButton;
    32. Land *land;
    33. Sea *sea;
    34.  
    35. // static stuff
    36. int curr_pos_in_menu;
    37. void changeColorOfButton();
    38.  
    39. public slots:
    40. void start();
    41. void mousePressEvent(QMouseEvent *event);
    42. };
    43.  
    44. #endif // GAME_H
    To copy to clipboard, switch view to plain text mode 

    Game.cpp:

    Qt Code:
    1. #include "game.h"
    2. #include "player.h"
    3. #include "button.h"
    4.  
    5. #include <QGraphicsRectItem>
    6. #include <QGraphicsScene>
    7. #include <QDebug>
    8. #include <QApplication>
    9. #include <QTimer>
    10. #include <QFont>
    11. #include <QMessageBox>
    12. #include <fstream>
    13. #include <cmath>
    14. #include <QRect>
    15. #include <QDesktopWidget>
    16. #include <QtMath>
    17.  
    18. QString Game::in_room = "menu";
    19.  
    20. Game::Game(QWidget *parent)
    21. {
    22. scene = new QGraphicsScene();
    23. scene->setSceneRect(0,0,350,300);
    24. setFixedSize(350,300);
    25. setScene(scene);
    26. setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    27. setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    28. setBackgroundBrush(QBrush(QImage("red")));
    29. show();
    30. menu();
    31. }
    32.  
    33. void Game::menu()
    34. {
    35. QGraphicsTextItem *title = new QGraphicsTextItem("NIGHTLESS");
    36. title->setPos(10,30);
    37. title->setFont(QFont("comic sans",40,70));
    38. scene->addItem(title);
    39.  
    40. qDebug() << width();
    41. startButton = new Button("START", 200, 50);
    42. startButton->setPos(width()/2-startButton->rect().width()/2,125);
    43. connect(startButton,SIGNAL(clicked()),this,SLOT(start()));
    44. scene->addItem(startButton);
    45.  
    46. quitButton = new Button("QUIT", 200, 50);
    47. quitButton->setPos(width()/2-quitButton->rect().width()/2,200);
    48. connect(quitButton,SIGNAL(clicked()),this,SLOT(close()));
    49. scene->addItem(quitButton);
    50.  
    51. }
    52.  
    53. void Game::createMap()
    54. {
    55. land = new Land;
    56. land->setPos(0,0);
    57. scene->addItem(land);
    58.  
    59. sea = new Sea;
    60. sea->setPos(0,0);
    61. scene->addItem(sea);
    62. }
    63.  
    64. void Game::createPlayer()
    65. {
    66. player = new Player;
    67. player->setFlag(QGraphicsItem::ItemIsFocusable);
    68. player->setFocus();
    69. centerOn(player);
    70. scene->addItem(player);
    71. }
    72.  
    73. QPixmap Game::darkenImage(QString file_name, float num)
    74. {
    75. QImage tmp( file_name );
    76.  
    77. for(int i=0;i<tmp.height();i++)
    78. {
    79. for(int k=0;k<tmp.width();k++)
    80. {
    81. QColor color( tmp.pixel( k, i ) ); // changed this from pixelColor() to ensure alpha is copied
    82. if ( tmp.pixel(k,i) != 0) // modify only the pixels with non-zero alpha
    83. {
    84. color.setRgb(color.red()*num,color.blue()*num,color.green()*num);
    85. tmp.setPixelColor(k,i,color);
    86. }
    87. }
    88. }
    89.  
    90. // Now, convert the image to a pixmap and set it on the graphics object
    91. QPixmap t = QPixmap::fromImage( tmp );
    92. return t;
    93. }
    94.  
    95. void Game::start()
    96. {
    97. scene->clear();
    98. in_room = "world";
    99. // semi-transparent background
    100. /*
    101.   QRect rec = QApplication::desktop()->screenGeometry();
    102.   int height = rec.height();
    103.   int width = rec.width();
    104.   */
    105.  
    106. setSceneRect(0,0,7097,7298);
    107. setFixedSize(1000,800);
    108. //setBackgroundBrush(QBrush(QImage(":/Images/Grass.png")));
    109. //showFullScreen();
    110.  
    111. createMap();
    112. createPlayer();
    113. }
    114.  
    115. void Game::mousePressEvent(QMouseEvent *event)
    116. {
    117. if(event->buttons() == Qt::RightButton && in_room!="menu"){
    118.  
    119. QLineF ln(event->pos(),player->pos());
    120. int angle = -1 * ln.angle() + 460;
    121.  
    122. int tmp = angle + 80;
    123. if(tmp>360)
    124. tmp-=360;
    125.  
    126. if(angle > 360)
    127. angle += -360;
    128.  
    129. player->setPlayerRotation(angle,tmp);
    130.  
    131. QPointF t(event->pos());
    132. player->setDestination(event->pos());
    133.  
    134. }
    135. }
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    In the Land and Sea class i just setPixmap to the image, put them into the scene,set position and that is it.

    And i have one more question, how do i make a player stop when he reaches his destination ? i was thinking about making an QGraphicsRectItem whenever i press a right button and then checking if player has collided with that item and when he does he stops and then that item gets deleted or is there a better and easier way to do that, cause comparing mouse pos() and player pos() is not working.

    Any kind of help or advice is appreciated !!!
    Last edited by FlyDoodle; 30th September 2019 at 15:13. Reason: spelling corrections

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