git.maemo.org Git - ghostsoverboard/blob - timercontrolledgraphicspixmapobject.cpp

   1 #include "timercontrolledgraphicspixmapobject.h"
   2 #include <QGraphicsScene>
   3 #include <QDebug>
   4
   5
   6 TimerControlledGraphicsPixmapObject::TimerControlledGraphicsPixmapObject(QPixmap pixmap, int speed, QGraphicsItem* parent) :
   7     QObject(), QGraphicsPixmapItem(pixmap, parent)
   8 {
   9     setSpeed(speed);
  10     direction_ = S;
  11     connect(&timer_,SIGNAL(timeout()),this,SLOT(move()));
  12 }
  13
  14 void TimerControlledGraphicsPixmapObject::startMoving()
  15 {
  16     timer_.start();
  17 }
  18
  19 void TimerControlledGraphicsPixmapObject::stopMoving()
  20 {
  21     timer_.stop();
  22 }
  23
  24 void TimerControlledGraphicsPixmapObject::setSpeed(int speed)
  25 {
  26     timer_.setInterval(1000/speed); //converts from pixels in second to milliseconds per pixel
  27 }
  28
  29 void TimerControlledGraphicsPixmapObject::move()
  30 {
  31
  32     int oldx = x();
  33     int oldy = y();
  34
  35     int newx = oldx;
  36     int newy = oldy;
  37
  38
  39     //calculate the new position
  40
  41     if (direction_ == E || direction_ == SE || direction_ == NE)
  42     {
  43         newx++;
  44     }
  45
  46     if (direction_ == W || direction_ == SW || direction_ == NW)
  47     {
  48         newx--;
  49     }
  50
  51     if (direction_ == S || direction_ == SE || direction_ == SW)
  52     {
  53         newy++;
  54     }
  55
  56     if (direction_ == N || direction_ == NE || direction_ == NW)
  57     {
  58         newy--;
  59     }
  60
  61
  62
  63     //Bound the item into the scene and change direction if hitting a boundary
  64     //Only works if the old position is inside the boundaries
  65
  66     if (!scene()) //no movement if this item does not belong to a scene
  67         return;
  68
  69     QRect sceneRectangle = scene()->sceneRect().toRect();
  70
  71     if (newx < sceneRectangle.left() || newx > sceneRectangle.right()-40)
  72     {
  73         changeDirection();
  74         return;
  75     }
  76
  77
  78     if (newy < sceneRectangle.top() || newy > sceneRectangle.bottom()-40)
  79     {
  80         changeDirection();
  81         return;     //the old x and y values remain intact
  82     }
  83
  84
  85     //Set the new position
  86
  87     setX(newx);
  88     setY(newy);
  89
  90
  91     //check for collisions and handle them (up to subclassess to implement)
  92     //return to the old position if requested
  93
  94     if (handleCollisions() == false)
  95     {
  96         setX(oldx);
  97         setY(oldy);
  98     }
  99
 100
 101 }
 102
 103 void TimerControlledGraphicsPixmapObject::changeDirection()
 104 {
 105     qDebug () << "Supposed to change direction";
 106
 107     int direction = (qrand()%8);
 108     qDebug()  << direction;
 109
 110     switch (direction)
 111     {
 112         case 0:
 113             direction_ = S;
 114             break;
 115
 116         case 1:
 117             direction_ = SW;
 118             break;
 119
 120        case 2:
 121             direction_ = W;
 122             break;
 123
 124        case 3:
 125             direction_ = NW;
 126             break;
 127
 128        case 4:
 129             direction_ = N;
 130             break;
 131
 132        case 5:
 133             direction_ = NE;
 134             break;
 135
 136        case 6:
 137             direction_ = E;
 138             break;
 139
 140       case 7:
 141             direction_ = SE;
 142             break;
 143
 144
 145     }
 146
 147 }
 148
 149 bool TimerControlledGraphicsPixmapObject::handleCollisions()
 150 {
 151     return true;
 152 }