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
|
#include <qevent.h>
#include <qpainter.h>
#include <qwt_math.h>
#include "attitude_indicator.h"
AttitudeIndicatorNeedle::AttitudeIndicatorNeedle(const QColor &c)
{
QPalette palette;
for ( int i = 0; i < QPalette::NColorGroups; i++ )
{
palette.setColor((QPalette::ColorGroup)i,
QColorGroup::Text, c);
}
setPalette(palette);
}
void AttitudeIndicatorNeedle::draw(QPainter *painter, const QPoint ¢er,
int length, double direction, QPalette::ColorGroup cg) const
{
direction *= M_PI / 180.0;
int triangleSize = qRound(length * 0.1);
painter->save();
const QPoint p0(QPoint(center.x() + 1, center.y() + 1));
const QPoint p1 = qwtPolar2Pos(p0,
length - 2 * triangleSize - 2, direction);
QPointArray pa(3);
pa.setPoint(0, qwtPolar2Pos(p1, 2 * triangleSize, direction));
pa.setPoint(1, qwtPolar2Pos(p1, triangleSize, direction + M_PI_2));
pa.setPoint(2, qwtPolar2Pos(p1, triangleSize, direction - M_PI_2));
painter->setBrush(colorGroup(cg).text());
painter->drawPolygon(pa);
painter->setPen(QPen(colorGroup(cg).text(), 3));
painter->drawLine(qwtPolar2Pos(p0, length - 2, direction + M_PI_2),
qwtPolar2Pos(p0, length - 2, direction - M_PI_2));
painter->restore();
}
AttitudeIndicator::AttitudeIndicator(
QWidget *parent, const char *name):
QwtDial(parent, name),
d_gradient(0.0)
{
setMode(RotateScale);
setWrapping(TRUE);
setOrigin(270.0);
setScaleOptions(ScaleTicks);
setScale(0, 0, 30.0);
setNeedle(new AttitudeIndicatorNeedle(colorGroup().text()));
}
void AttitudeIndicator::setGradient(double gradient)
{
if ( gradient < -1.0 )
gradient = -1.0;
else if ( gradient > 1.0 )
gradient = 1.0;
if ( d_gradient != gradient )
{
d_gradient = gradient;
update();
}
}
void AttitudeIndicator::drawScale(QPainter *painter, const QPoint ¢er,
int radius, double origin, double minArc, double maxArc) const
{
double dir = (360.0 - origin) * M_PI / 180.0; // counter clockwise, radian
int offset = 4;
const QPoint p0 = qwtPolar2Pos(center, offset, dir + M_PI);
const int w = contentsRect().width();
QPointArray pa(4);
pa.setPoint(0, qwtPolar2Pos(p0, w, dir - M_PI_2));
pa.setPoint(1, qwtPolar2Pos(pa.point(0), 2 * w, dir + M_PI_2));
pa.setPoint(2, qwtPolar2Pos(pa.point(1), w, dir));
pa.setPoint(3, qwtPolar2Pos(pa.point(2), 2 * w, dir - M_PI_2));
painter->save();
painter->setClipRegion(pa); // swallow 180 - 360 degrees
QwtDial::drawScale(painter, center, radius, origin,
minArc, maxArc);
painter->restore();
}
void AttitudeIndicator::drawScaleContents(QPainter *painter,
const QPoint &, int) const
{
int dir = 360 - qRound(origin() - value()); // counter clockwise
int arc = 90 + qRound(gradient() * 90);
const QColor skyColor(38, 151, 221);
painter->save();
painter->setBrush(skyColor);
painter->drawChord(scaleContentsRect(),
(dir - arc) * 16, 2 * arc * 16 );
painter->restore();
}
void AttitudeIndicator::keyPressEvent(QKeyEvent *e)
{
switch(e->key())
{
case Qt::Key_Plus:
setGradient(gradient() + 0.05);
break;
case Qt::Key_Minus:
setGradient(gradient() - 0.05);
break;
default:
QwtDial::keyPressEvent(e);
}
}
|
