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#include <qevent.h>
#include <qpainter.h>
#include <qwt_math.h>
#include <qwt_polygon.h>
#include "attitude_indicator.h"
AttitudeIndicatorNeedle::AttitudeIndicatorNeedle(const QColor &c)
{
QPalette palette;
for ( int i = 0; i < QPalette::NColorGroups; i++ )
{
#if QT_VERSION < 0x040000
palette.setColor((QPalette::ColorGroup)i,
QColorGroup::Text, c);
#else
palette.setColor((QPalette::ColorGroup)i,
QPalette::Text, c);
#endif
}
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);
QwtPolygon 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));
const QColor color =
#if QT_VERSION < 0x040000
palette().color(cg, QColorGroup::Text);
#else
palette().color(cg, QPalette::Text);
#endif
painter->setBrush(color);
painter->drawPolygon(pa);
painter->setPen(QPen(color, 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):
QwtDial(parent),
d_gradient(0.0)
{
setMode(RotateScale);
setWrapping(true);
setOrigin(270.0);
setScaleOptions(ScaleTicks);
setScale(0, 0, 30.0);
const QColor color =
#if QT_VERSION < 0x040000
colorGroup().text();
#else
palette().color(QPalette::Text);
#endif
setNeedle(new AttitudeIndicatorNeedle(color));
}
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();
QwtPolygon 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);
}
}
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