最近需要用Qt开发一个带有雷达扫描功能的组件，最后总结一下实现的过程。先贴个图，大神看了请无视。(●'◡'●)
testskywidget.cpp关键代码如下：
void TestSkyWidget::paintEvent(QPaintEvent *)
{
QPainter painter(this);
float topMargin ;
float leftMargin;
float size;
float satelliteSize;
float fontSize;
float availableWidth = widgetSize.width ();
float availableHeight = widgetSize.height();
qreal x = widgetSize.center().x() + (qreal) availableWidth /2 * cos(-m_pieRotate*3.14159/180);
qreal y = widgetSize.center().y() + (qreal) availableWidth /2 * sin(-m_pieRotate*3.14159/180);
painter.setPen(QPen(Qt::white));
painter.drawLine(widgetSize.center(),QPointF(x,y));
//----//扇形
QConicalGradient gradient;
gradient.setCenter(widgetSize.center());
gradient.setAngle(m_pieRotate + 180); //渐变与旋转方向恰好相反，以扇形相反的边作为渐变角度。
gradient.setColorAt(0.8,QColor(255,255,255,100)); //从渐变角度开始0.5 - 0.75为扇形区域，由于Int类型计算不精确，将范围扩大到0.4-0.8
//gradient.setColorAt(0.8,QColor(255,255,255,0));
gradient.setColorAt(0.4,QColor(255,0,105,100));
painter.setBrush(QBrush(gradient));
// painter.setBrush(QBrush(QColor(255,10,100,100)));
painter.setPen(Qt::NoPen);
painter.drawPie(widgetSize,m_pieRotate*16,90*16);//添加扫描功能
//装饰-随机点
for(int i = 0; i < m_points.count(); ++i)
{
int colorAlaph = m_pointsAlapha.at(i);
painter.setPen(QPen(QColor(255,255,255,colorAlaph),3));
painter.drawPoint(m_points.at(i));
}
if( availableHeight/*height()*/ > availableWidth/*width()*/ )
{
size = widgetSize.width() * p_marginScale;
topMargin = ( widgetSize.width() - widgetSize.width() * p_marginScale +
widgetSize.height() - widgetSize.width() ) / 2.0;
leftMargin = ( widgetSize.width() - widgetSize.width() * p_marginScale ) / 2.0;
// widgetSize = QRect(0,(height() - width())/2 ,width(),width());
}
else
{
size = widgetSize.height() * p_marginScale;
leftMargin = ( widgetSize.height() - widgetSize.height() * p_marginScale +
widgetSize.width() - widgetSize.height()) / 2.0;
topMargin = ( widgetSize.height() - widgetSize.height() * p_marginScale ) / 2.0;
//widgetSize = QRect((width() - height())/2 ,0,height(),height());
}
satelliteSize = size * p_satScale;
//satelliteSize = widgetSize/*size*/ * p_satScale;
painter.setRenderHint(QPainter::Antialiasing, p_antialiased);
painter.translate( leftMargin, topMargin );
fontSize = size * p_fontScale;
painter.setFont(
QFont( "Arial",
static_cast< int >( fontSize ) ) );
// paint the circles
for( int i=0; i < p_ellipses; i++ )
{
float radius = size / 2.0 - i * ( size / ( 2.0 * p_ellipses ) );
painter.setPen( QPen( p_gridColor, p_gridWidth ) );
painter.drawEllipse(
QPoint( size/2.0, size/2.0 ),
static_cast< int >( radius ),
static_cast< int >( radius ) );
if( p_withGridLabels )
{
painter.setPen( QPen( p_gridTextColor, p_gridWidth ) );
painter.drawText( QPoint( size/2.0 + p_textMargin, size/2.0 - ( radius + p_textMargin ) ),
QString("%1").arg( i * (90 / p_ellipses ) ) );
}
}
// paint the crosses
for( int i=0; i < p_crosses; i ++ )
{
QLineF line1;
QLineF line2;
float angle = static_cast(i) * 90.0 / static_cast (p_crosses);
line1.setP1( QPoint( size/2.0, size/2.0 ) );
line1.setLength( size/2.0 );
QRectF textRect( 0, 0, 4.0 * fontSize, fontSize + 2.0 );
for( int c = 0; c < 4; c++ )
{
line1.setAngle( angle + c*90.0 + 90.0 );
painter.setPen( QPen( p_gridColor, p_gridWidth ) );
painter.drawLine( line1 );
if( p_withGridLabels )
{
painter.setPen( QPen( p_gridTextColor, p_gridWidth ) );
line2 = QLineF( line1 );
line2.setLength( size/2.0 + 2.0 * fontSize );
textRect.moveCenter( line2.p2() );
if( i > 0 )
painter.drawText( textRect, Qt::AlignCenter, QString( "%1").arg( 360.0 - (c*90.0 ) - angle ) );
else
painter.drawText( textRect, Qt::AlignCenter, QString( "N") );
}
}
}
QBrush innerBrush = QBrush( Qt::SolidPattern );
//QBrush outerBrush = QBrush( );
foreach( auto s, satellites )
{
// skip invisible satellites
if( s.state & SatelliteState::Invisible || // the invisible flag is set
( !( s.state & SatelliteState::Visible ) & // neither visible nor half-visible
!( s.state & SatelliteState::HalfVisible ) ) ||
( s.state & (SatelliteState::Flashing/*|SatelliteState::Flashing1|SatelliteState::Flashing2*/) && flash ) // flashing flag is set and flash is active
)
continue;
float el_s = ( 90 - s.el ) * size / ( 2 * 90.0 );
QRectF labelRect( 0, 0, s.label.length() * satelliteSize, satelliteSize+2 );
QPoint satPos( size/2 + sin( s.az * 2 * MY_PI / 360.0 ) * el_s,
size/2 - cos( s.az * 2 * MY_PI / 360.0 ) * el_s );
// define the color's alpha value (0.3 or 1.0)
QColor innerColor = s.innerColor;
QColor outerColor = s.outerColor;
QColor fontColor = s.fontColor;
if( s.state & SatelliteState::Visible )
{
innerColor.setAlphaF( 1.0 );
outerColor.setAlphaF( 1.0 );
fontColor.setAlphaF( 1.0 );
}
else
{
innerColor.setAlphaF( 0.3 );
outerColor.setAlphaF( 0.3 );
fontColor.setAlphaF( 0.3 );
}
// paint the inner circle
innerBrush.setColor( innerColor );
painter.setBrush( innerBrush );
if( s.state & SatelliteState::Marked )
painter.setPen( QPen( outerColor, satelliteSize/4 ) );
else
painter.setPen( QPen( p_gridColor, 0 ) );
painter.drawEllipse(
satPos,
static_cast< int >( satelliteSize ),
static_cast< int >( satelliteSize ) );
// write the text
painter.setPen( QPen( fontColor, 1 ) );
painter.setFont(
QFont( "Arial",
static_cast< int >( satelliteSize ),
QFont::Bold ) );
labelRect.moveCenter( satPos );
painter.drawText( labelRect, Qt::AlignCenter, s.label );
}
}
void TestSkyWidget::insert(
int id,
float az,
float el,
const QString & label,
const QColor & outerColor,
const QColor & innerColor,
const QColor & fontColor,
SatelliteState state )
{
Satellite sat;
sat.label = label;
sat.az = az;
sat.el = el;
sat.state = state;
sat.innerColor = innerColor;
sat.outerColor = outerColor;
sat.fontColor = fontColor;
this->update();
satellites.insert( id, sat );
}
//
void TestSkyWidget::remove( int id )
{
satellites.remove( id );
}
//
bool TestSkyWidget::contains( int id ) const
{
return satellites.contains( id );
}
//
QColor TestSkyWidget::innerColor( int id ) const
{
return satellites[ id ].innerColor;
}
//
QColor TestSkyWidget::outerColor( int id ) const
{
return satellites[ id ].outerColor;
}
QColor TestSkyWidget::fontColor( int id ) const
{
return satellites[ id ].fontColor;
}
//
void TestSkyWidget::setInnerColor( int id, const QColor & c )
{
satellites[ id ].innerColor = c;
this->update();
}
//
void TestSkyWidget::setOuterColor( int id, const QColor & c )
{
satellites[ id ].outerColor = c;
}
//
void TestSkyWidget::setFontColor( int id, const QColor & c )
{
satellites[ id ].fontColor = c;
}
//
TestSkyWidget::SatelliteState TestSkyWidget::state( int id ) const
{
return satellites[ id ].state;
}
//
void TestSkyWidget::setState( int id, SatelliteState state )
{
satellites[ id ].state = state;
this->update();
}
//
QString TestSkyWidget::label( int id ) const
{
return satellites[ id ].label;
}
//
void TestSkyWidget::setLabel( int id, const QString & label )
{
satellites[ id ].label = label;
this->update();
}
float TestSkyWidget::azimuth( int id ) const
{
return satellites[ id ].az;
}
float TestSkyWidget::elevation( int id ) const
{
return satellites[ id ].el;
}
void TestSkyWidget::setAzimuth( int id, float az )
{
satellites[ id ].az = az;
this->update();
}
void TestSkyWidget::setElevation( int id, float el )
{
satellites[ id ].el = el;
this->update();
}
QListTestSkyWidget::ids( void ) const
{
return satellites.keys();
}
TestSkyWidget::SatelliteState operator|
(
TestSkyWidget::SatelliteState lhs,
TestSkyWidget::SatelliteState rhs
)
{
return static_cast< TestSkyWidget::SatelliteState >
(
static_cast< quint8 >( lhs ) | static_cast< quint8 >( rhs )
);
}
//定时器事件
void TestSkyWidget::timerEvent(QTimerEvent *event)
{
if(m_timerId == event->timerId())
{
m_pieRotate -= 10;
update();
}
else if(m_pointTimerId == event->timerId())
{
//随机更换装饰的点
for(int i = 0; i < m_points.count(); ++i)
{
int offsetX = rand()%widgetSize.width();
int offsetY = rand()%widgetSize.width();
int alapha = rand()%255;
m_points.replace(i,QPoint(offsetX,offsetY) + widgetSize.topLeft());
m_pointsAlapha.replace(i,alapha);
}
update();
}
}
//尺寸
void TestSkyWidget::resizeEvent(QResizeEvent *)
{
if(width() > height())
{
widgetSize = QRect((width() - height())/1000 ,0,height(),height());
}
else
{
widgetSize = QRect(0,(height() - width())/1000 ,width(),width());
}
//widgetSize.adjust(10,10,-10,-10);
//widgetSize.adjust(5,5,-10,-10);
}