blob: 85d436bc24147ee06c2be7a41705cb243d1b3ff9 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
|
#include "rocketitem.h"
#include "tankitem.h"
#include <QPainter>
#include <QGraphicsScene>
#include <math.h>
#ifndef M_PI
#define M_PI 3.14159265358979323846
#endif
RocketItem::RocketItem()
: m_direction(0.0), m_distance(300.0)
{
}
QRectF RocketItem::boundingRect() const
{
return QRectF(-1.0, -1.0, 2.0, 2.0);
}
void RocketItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *)
{
painter->setBrush(Qt::black);
painter->drawEllipse(boundingRect());
}
void RocketItem::idle(qreal elapsed)
{
qreal dist = elapsed * speed();
m_distance -= dist;
if (m_distance < 0.0) {
scene()->removeItem(this);
delete this;
return;
}
qreal a = m_direction * M_PI / 180.0;
qreal yd = dist * sin(a);
qreal xd = dist * sin(M_PI / 2.0 - a);
QPointF requestedPosition = pos() + QPointF(xd, yd);
QGraphicsItem *collidedItem = 0;
QPointF nextPosition = tryMove(requestedPosition, 0, &collidedItem);
if (requestedPosition == nextPosition) {
setPos(nextPosition);
} else {
if (TankItem *tankItem = qgraphicsitem_cast<TankItem *>(collidedItem))
tankItem->hitByRocket();
scene()->removeItem(this);
delete this;
}
}
|