void ColorWheel::drawWheel(const QSize &newSize)
{
int r = qMin(newSize.width(), newSize.height());
QStyleOption option;
option.initFrom(this);
// QStyle::State state = option.state;
QBrush background = option.palette.window();
QPainter painter(&wheel);
painter.setRenderHint(QPainter::Antialiasing);
wheel.fill(background.color());
QConicalGradient conicalGradient(0, 0, 0);
conicalGradient.setColorAt(0.0, Qt::red);
conicalGradient.setColorAt(60.0/360.0, Qt::yellow);
conicalGradient.setColorAt(120.0/360.0, Qt::green);
conicalGradient.setColorAt(180.0/360.0, Qt::cyan);
conicalGradient.setColorAt(240.0/360.0, Qt::blue);
conicalGradient.setColorAt(300.0/360.0, Qt::magenta);
conicalGradient.setColorAt(1.0, Qt::red);
/* outer circle */
painter.translate(r / 2, r / 2);
QBrush brush(conicalGradient);
painter.setPen(Qt::NoPen);
painter.setBrush(brush);
painter.drawEllipse(QPoint(0,0),r/2-margin,r/2-margin);
/* inner circle */
painter.setBrush(background);
painter.drawEllipse(QPoint(0,0),r/2-margin-wheelWidth,r/2-margin-wheelWidth);
// QPainter painter2(&wheel);
// painter2.drawImage(0,0,source);
//caculate wheel region
wheelRegion = QRegion(r/2, r/2, r-2*margin, r-2*margin, QRegion::Ellipse);
wheelRegion.translate(-(r-2*margin)/2, -(r-2*margin)/2);
int tmp = 2*(margin+wheelWidth);
QRegion subRe( r/2, r/2, r-tmp, r-tmp, QRegion::Ellipse );
subRe.translate(-(r-tmp)/2, -(r-tmp)/2);
wheelRegion -= subRe;
}
void NQColorWheel::initializeWheel(const QSize& size)
{
int r = qMin(size.width(), size.height());
QStyleOption option;
option.initFrom(this);
QBrush background = option.palette.window();
imageWheel_ = QImage(size, QImage::Format_ARGB32_Premultiplied);
imageWheel_.fill(background.color());
QPainter painter(&imageWheel_);
painter.setRenderHint(QPainter::Antialiasing);
QConicalGradient conicalGradient(0, 0, 0);
conicalGradient.setColorAt(0.0, Qt::red);
conicalGradient.setColorAt(60.0/360.0, Qt::yellow);
conicalGradient.setColorAt(120.0/360.0, Qt::green);
conicalGradient.setColorAt(180.0/360.0, Qt::cyan);
conicalGradient.setColorAt(240.0/360.0, Qt::blue);
conicalGradient.setColorAt(300.0/360.0, Qt::magenta);
conicalGradient.setColorAt(1.0, Qt::red);
painter.translate(r/2, r/2);
QBrush brush(conicalGradient);
painter.setPen(Qt::NoPen);
painter.setBrush(brush);
painter.drawEllipse(QPoint(0,0), r/2-margin_,r/2-margin_);
/* inner circle */
painter.setBrush(background);
painter.drawEllipse(QPoint(0,0), r/2-margin_-wheelWidth_, r/2-margin_-wheelWidth_);
//caculate wheel region
regionWheel_ = QRegion(r/2, r/2, r-2*margin_, r-2*margin_, QRegion::Ellipse);
regionWheel_.translate(-(r-2*margin_)/2, -(r-2*margin_)/2);
int tmp = 2*(margin_+wheelWidth_);
QRegion subRe(r/2, r/2, r-tmp, r-tmp, QRegion::Ellipse);
subRe.translate(-(r-tmp)/2, -(r-tmp)/2);
regionWheel_ -= subRe;
}
void ColorWheel::drawWheel(const QSize &newSize)
{
int r = qMin(newSize.width(), newSize.height());
QStyleOption option;
option.initFrom(this);
QBrush background = option.palette.window();
wheelImage = QImage(newSize, QImage::Format_ARGB32_Premultiplied);
wheelImage.fill(background.color());
QPainter painter(&wheelImage);
painter.setRenderHint(QPainter::Antialiasing);
QConicalGradient conicalGradient(0, 0, 5);
conicalGradient.setColorAt(0.0, Qt::red);
conicalGradient.setColorAt(60.0/360.0, Qt::yellow);
conicalGradient.setColorAt(120.0/360.0, Qt::green);
conicalGradient.setColorAt(180.0/360.0, Qt::cyan);
conicalGradient.setColorAt(230.0/360.0, Qt::blue);
conicalGradient.setColorAt(300.0/360.0, Qt::magenta);
conicalGradient.setColorAt(1.0, Qt::red);
painter.translate(r / 2, r / 2);
QBrush brush(conicalGradient);
painter.setPen(Qt::NoPen);
painter.setBrush(brush);
painter.drawEllipse(QPoint(0,0),r/2-margin,r/2-margin);
painter.setBrush(background);
painter.drawEllipse(QPoint(0,0),r/2-margin-wWidth,r/2-margin-wWidth);
wheelRegion = QRegion(r/2, r/2, r-2*margin, r-2*margin, QRegion::Ellipse);
wheelRegion.translate(-(r-2*margin)/2, -(r-2*margin)/2);
int tmp = 2*(margin+wWidth);
QRegion subRe( r/2, r/2, r-tmp, r-tmp, QRegion::Ellipse );
subRe.translate(-(r-tmp)/2, -(r-tmp)/2);
wheelRegion -= subRe;
}
void ColorWheel::resizeEvent(QResizeEvent* event) {
// update wheel region
QSize size(event->size());
int diameter = qMin(size.width(), size.height());
wheelRegion_ = QRegion(diameter/2, diameter/2, diameter-2*margin_, diameter-2*margin_, QRegion::Ellipse);
wheelRegion_.translate(-(diameter-2*margin_)/2, -(diameter-2*margin_)/2);
int tmp = 2*(margin_+wheelWidth_);
QRegion subRe(diameter/2, diameter/2, diameter-tmp, diameter-tmp, QRegion::Ellipse);
subRe.translate(-(diameter-tmp)/2, -(diameter-tmp)/2);
wheelRegion_ -= subRe;
// update square region
int w = qMin(width(), height());
qreal r = w/2.0 - margin_; // radius of outer circle
qreal ir = r - wheelWidth_; // radius of inner circle
qreal m = w/2.0 - ir/std::sqrt(2.0); // left corner of square
QRectF rect;
rect.setTopLeft(QPointF(m, m));
rect.setWidth(2.0 * ir / std::sqrt(2.0));
rect.setHeight(2.0 * ir / std::sqrt(2.0));
squareRegion_ = QRegion(rect.toRect());
}
