-
Notifications
You must be signed in to change notification settings - Fork 1
/
cannon.cpp
199 lines (158 loc) · 4.07 KB
/
cannon.cpp
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
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
/****************************************************************
**
** Implementation CannonField class, Qt tutorial 12
**
****************************************************************/
#include "cannon.h"
#include <qtimer.h>
#include <qpainter.h>
#include <qpixmap.h>
#include <qdatetime.h>
#include <math.h>
#include <stdlib.h>
CannonField::CannonField( QWidget *parent, const char *name )
: QWidget( parent, name )
{
ang = 45;
f = 0;
timerCount = 0;
autoShootTimer = new QTimer( this, "movement handler" );
connect( autoShootTimer, SIGNAL(timeout()),
this, SLOT(moveShot()) );
shoot_ang = 0;
shoot_f = 0;
target = QPoint( 0, 0 );
setPalette( QPalette( QColor( 250, 250, 200) ) );
newTarget();
}
void CannonField::setAngle( int degrees )
{
if ( degrees < 5 )
degrees = 5;
if ( degrees > 70 )
degrees = 70;
if ( ang == degrees )
return;
ang = degrees;
repaint( cannonRect(), FALSE );
emit angleChanged( ang );
}
void CannonField::setForce( int newton )
{
if ( newton < 0 )
newton = 0;
if ( f == newton )
return;
f = newton;
emit forceChanged( f );
}
void CannonField::shoot()
{
if ( autoShootTimer->isActive() )
return;
timerCount = 0;
shoot_ang = ang;
shoot_f = f;
autoShootTimer->start( 50 );
}
void CannonField::newTarget()
{
static bool first_time = TRUE;
if ( first_time ) {
first_time = FALSE;
QTime midnight( 0, 0, 0 );
srand( midnight.secsTo(QTime::currentTime()) );
}
QRegion r( targetRect() );
target = QPoint( 200 + rand() % 190,
10 + rand() % 255 );
repaint( r.unite( targetRect() ) );
}
void CannonField::moveShot()
{
QRegion r( shotRect() );
timerCount++;
QRect shotR = shotRect();
if ( shotR.intersects( targetRect() ) ) {
autoShootTimer->stop();
emit hit();
} else if ( shotR.x() > width() || shotR.y() > height() ) {
autoShootTimer->stop();
emit missed();
} else {
r = r.unite( QRegion( shotR ) );
}
repaint( r );
}
void CannonField::paintEvent( QPaintEvent *e )
{
QRect updateR = e->rect();
QPainter p( this );
if ( updateR.intersects( cannonRect() ) )
paintCannon( &p );
if ( autoShootTimer->isActive() &&
updateR.intersects( shotRect() ) )
paintShot( &p );
if ( updateR.intersects( targetRect() ) )
paintTarget( &p );
}
void CannonField::paintShot( QPainter *p )
{
p->setBrush( black );
p->setPen( NoPen );
p->drawRect( shotRect() );
}
void CannonField::paintTarget( QPainter *p )
{
p->setBrush( red );
p->setPen( black );
p->drawRect( targetRect() );
}
const QRect barrelRect(33, -4, 15, 8);
void CannonField::paintCannon( QPainter *p )
{
QRect cr = cannonRect();
QPixmap pix( cr.size() );
pix.fill( this, cr.topLeft() );
QPainter tmp( &pix );
tmp.setBrush( blue );
tmp.setPen( NoPen );
tmp.translate( 0, pix.height() - 1 );
tmp.drawPie( QRect( -35,-35, 70, 70 ), 0, 90*16 );
tmp.rotate( -ang );
tmp.drawRect( barrelRect );
tmp.end();
p->drawPixmap( cr.topLeft(), pix );
}
QRect CannonField::cannonRect() const
{
QRect r( 0, 0, 50, 50 );
r.moveBottomLeft( rect().bottomLeft() );
return r;
}
QRect CannonField::shotRect() const
{
const double gravity = 4;
double time = timerCount / 4.0;
double velocity = shoot_f;
double radians = shoot_ang*3.14159265/180;
double velx = velocity*cos( radians );
double vely = velocity*sin( radians );
double x0 = ( barrelRect.right() + 5 )*cos(radians);
double y0 = ( barrelRect.right() + 5 )*sin(radians);
double x = x0 + velx*time;
double y = y0 + vely*time - 0.5*gravity*time*time;
QRect r = QRect( 0, 0, 6, 6 );
r.moveCenter( QPoint( qRound(x), height() - 1 - qRound(y) ) );
return r;
}
QRect CannonField::targetRect() const
{
QRect r( 0, 0, 20, 10 );
r.moveCenter( QPoint(target.x(),height() - 1 - target.y()) );
return r;
}
QSizePolicy CannonField::sizePolicy() const
{
return QSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding );
}