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
|
// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include "analogclock.h"
#include <QPainter>
#include <QTime>
#include <QTimer>
//! [0] //! [1]
AnalogClock::AnalogClock(QWidget *parent)
//! [0] //! [2]
: QWidget(parent)
//! [2] //! [3]
{
//! [3] //! [4]
QTimer *timer = new QTimer(this);
//! [4] //! [5]
connect(timer, &QTimer::timeout, this, QOverload<>::of(&AnalogClock::update));
//! [5] //! [6]
timer->start(1000);
//! [6]
setWindowTitle(tr("Analog Clock"));
resize(200, 200);
//! [7]
}
//! [1] //! [7]
//! [8] //! [9]
void AnalogClock::paintEvent(QPaintEvent *)
//! [8] //! [10]
{
static const QPoint hourHand[4] = {
QPoint(5, 14),
QPoint(-5, 14),
QPoint(-4, -71),
QPoint(4, -71)
};
static const QPoint minuteHand[4] = {
QPoint(4, 14),
QPoint(-4, 14),
QPoint(-3, -89),
QPoint(3, -89)
};
static const QPoint secondsHand[4] = {
QPoint(1, 14),
QPoint(-1, 14),
QPoint(-1, -89),
QPoint(1, -89)
};
const QColor hourColor(palette().color(QPalette::Text));
const QColor minuteColor(palette().color(QPalette::Text));
const QColor secondsColor(palette().color(QPalette::Accent));
int side = qMin(width(), height());
//! [10]
//! [11]
QPainter painter(this);
//! [11] //! [12]
painter.setRenderHint(QPainter::Antialiasing);
//! [12] //! [13]
painter.translate(width() / 2, height() / 2);
painter.scale(side / 200.0, side / 200.0);
//! [9] //! [13]
//! [14]
QTime time = QTime::currentTime();
//! [14]
//! [15]
painter.setPen(Qt::NoPen);
//! [15] //! [16]
painter.setBrush(hourColor);
//! [16]
//! [18]
//! [17]
painter.save();
//! [17] //! [19]
painter.rotate(30.0 * ((time.hour() + time.minute() / 60.0)));
painter.drawConvexPolygon(hourHand, 4);
painter.restore();
//! [18] //! [19]
//! [20]
for (int i = 0; i < 12; ++i) {
painter.drawRect(73, -3, 16, 6);
painter.rotate(30.0);
}
//! [20]
//! [21]
painter.setBrush(minuteColor);
//! [22]
painter.save();
painter.rotate(6.0 * time.minute());
painter.drawConvexPolygon(minuteHand, 4);
painter.restore();
//! [21] //! [22]
//! [23]
painter.setBrush(secondsColor);
//! [23]
//! [24]
painter.save();
painter.rotate(6.0 * time.second());
painter.drawConvexPolygon(secondsHand, 4);
painter.drawEllipse(-3, -3, 6, 6);
painter.drawEllipse(-5, -68, 10, 10);
painter.restore();
//! [24]
//! [25]
painter.setPen(minuteColor);
//! [25] //! [26]
//! [27]
for (int j = 0; j < 60; ++j) {
painter.drawLine(92, 0, 96, 0);
painter.rotate(6.0);
}
//! [27]
}
//! [26]
|
