void Draw::brushChanged()
{
Qt::BrushStyle style = Qt::BrushStyle(brushStyleComboBox->itemData(
brushStyleComboBox->currentIndex(), IdRole).toInt());
if (style == Qt::LinearGradientPattern) {
QLinearGradient linearGradient(0, 0, 100, 100);
linearGradient.setColorAt(0.0, Qt::white);
linearGradient.setColorAt(0.2, Qt::green);
linearGradient.setColorAt(1.0, Qt::black);
m_renderArea->setBrush(linearGradient);
} else if (style == Qt::RadialGradientPattern) {
QRadialGradient radialGradient(50, 50, 50, 70, 70);
radialGradient.setColorAt(0.0, Qt::white);
radialGradient.setColorAt(0.2, Qt::green);
radialGradient.setColorAt(1.0, Qt::black);
m_renderArea->setBrush(radialGradient);
} else if (style == Qt::ConicalGradientPattern) {
QConicalGradient conicalGradient(50, 50, 150);
conicalGradient.setColorAt(0.0, Qt::white);
conicalGradient.setColorAt(0.2, Qt::green);
conicalGradient.setColorAt(1.0, Qt::black);
m_renderArea->setBrush(conicalGradient);
} else if (style == Qt::TexturePattern) {
m_renderArea->setBrush(QBrush(QPixmap(":/resources/brick.png")));
} else {
m_renderArea->setBrush(QBrush(Qt::green, style));
}
}
void ColorWheel::drawOuterRing(QPainter &painter) {
int r = qMin(this->width(), this->height());
QPointF center(r/2.0, r/2.0);
// paint hue wheel
painter.save();
QConicalGradient conicalGradient(center, 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);
QBrush brush(conicalGradient);
painter.setPen(Qt::NoPen);
painter.setBrush(brush);
// outer circle
QPainterPath path;
path.addEllipse(center, r/2.0 - margin_, r/2.0 - margin_);
// inner circle
path.addEllipse(center, r/2.0 - margin_ - wheelWidth_, r/2.0 - margin_ - wheelWidth_);
painter.drawPath(path);
painter.restore();
}
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 ColorWheel::drawWheelImage(const QSize &newSize)
{
int r = qMin(newSize.width(), newSize.height());
QStyleOption option;
option.initFrom(this);
QBrush backgroundBrush = option.palette.window();
mWheelImage = QImage(newSize, QImage::Format_ARGB32_Premultiplied);
QPainter painter(&mWheelImage);
painter.setRenderHint(QPainter::Antialiasing);
painter.fillRect(mWheelImage.rect(), backgroundBrush);
QConicalGradient conicalGradient(0, 0, 0);
for (int hue = 0; hue < 360; hue += 1)
{
conicalGradient.setColorAt(hue / 360.0, QColor::fromHsv(hue, 255, 255));
}
qreal ir = r - mWheelThickness;
/* outer circle */
painter.translate(width() / 2, height() / 2);
QBrush brush(conicalGradient);
painter.setPen(Qt::NoPen);
painter.setBrush(brush);
painter.drawEllipse(QPoint(0, 0), r / 2, r / 2);
/* inner circle */
painter.setBrush(backgroundBrush);
painter.drawEllipse(QPoint(0, 0), r / 2 - mWheelThickness, r / 2 - mWheelThickness);
// Center of wheel
qreal m1 = (mWheelPixmap.width() / 2) - (ir / qSqrt(2));
qreal m2 = (mWheelPixmap.height() / 2) - (ir / qSqrt(2));
// Calculate size of wheel width
qreal wheelWidth = 2 * ir / qSqrt(2);
// Calculate wheel region
mWheelRect = QRectF(m1, m2, wheelWidth, wheelWidth).toAlignedRect();
}
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::drawWheelImage(const QSize &newSize)
{
int r = qMin(newSize.width(), newSize.height());
QStyleOption option;
option.initFrom(this);
QBrush backgroundBrush = option.palette.window();
m_wheelImage = QImage(newSize, QImage::Format_ARGB32_Premultiplied);
//m_wheelImage.fill(background.color()); // Only in 4.8
QPainter painter(&m_wheelImage);
painter.setRenderHint(QPainter::Antialiasing);
painter.fillRect(m_wheelImage.rect(), backgroundBrush);
QConicalGradient conicalGradient(0, 0, 0);
for (int hue = 0; hue < 360; hue +=1)
{
conicalGradient.setColorAt( hue / 360.0, QColor::fromHsv(hue, 255, 255));
}
/* outer circle */
painter.translate(r / 2, r / 2);
QBrush brush(conicalGradient);
painter.setPen(Qt::NoPen);
painter.setBrush(brush);
painter.rotate( -90 );
painter.drawEllipse(QPoint(0, 0), r/2, r/2);
/* inner circle */
painter.setBrush(backgroundBrush);
painter.drawEllipse(QPoint(0, 0), r/2 - m_wheelWidth, r/2 - m_wheelWidth);
//caculate wheel region
m_wheelRegion = QRegion(0, 0, r, r, QRegion::Ellipse);
}
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::paintEvent(QPaintEvent *)
{
QPainter painter(this);
painter.setRenderHint(QPainter::Antialiasing);
const int r = 150;
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,r);
QBrush brush(conicalGradient);
painter.setPen(Qt::NoPen);
painter.setBrush(brush);
painter.drawEllipse(QPoint(0, 0), r, r);
}
void Widget::paintEvent(QPaintEvent *event)
{
QPainter painter(this);
/* 1. 绘制线条 */
painter.drawLine(QPoint(0, 0), QPoint(100, 100));
/* 创建画笔 */
/* 画刷 线宽 画笔风格 画笔端点风格 画笔连接风格 */
QPen pen(Qt::green, 5, Qt::DotLine, Qt::RoundCap, Qt::RoundJoin);
//使用画笔
painter.setPen(pen);
QRectF rectangle(70.0, 40.0, 80.0, 60.0);
int startAngle = 30 * 16; /* 实际角度值 x 16*/
int spanAngle = 120 * 16;
/* 2. 绘制圆弧 */
painter.drawArc(rectangle, startAngle, spanAngle);
//重新设置画笔
pen.setWidth(1);
pen.setStyle(Qt::SolidLine);
painter.setPen(pen);
/* 3. 绘制一个矩形 */
painter.drawRect(160, 20, 50, 40);
//重新设置画笔
pen.setColor(QColor(255,0,0));
painter.setPen(pen);
//创建画刷
QBrush brush(QColor(0, 0, 255), Qt::Dense4Pattern);
//使用画刷
painter.setBrush(brush);
/* 4. 绘制椭圆 */
painter.drawEllipse(220, 20, 60, 40);
//设置纹理
brush.setTexture(QPixmap("../myDrawing/yafeilinux.png"));
//重新使用画刷
painter.setBrush(brush);
//定义四个点
static const QPointF points[4] = {
QPointF(270.0, 80.0),
QPointF(290.0, 10.0),
QPointF(350.0, 30.0),
QPointF(390.0, 70.0)
};
/* 5. 使用四个点绘制多边形 */
painter.drawPolygon(points, 4);
/* 6 使用画刷填充一个矩形区域 */
painter.fillRect(QRect(10, 100, 150, 20), QBrush(Qt::darkYellow));
//擦除一个矩形区域的内容
painter.eraseRect(QRect(50, 0, 50, 120));
/*线性渐变*/
QLinearGradient linearGradient(QPointF(40, 190), QPointF(70, 190)); // 线性渐变
/*插入颜色*/
linearGradient.setColorAt(0, Qt::yellow);
linearGradient.setColorAt(0.5, Qt::red);
linearGradient.setColorAt(1, Qt::green);
/*指定渐变区域以外的区域的扩散方式*/
linearGradient.setSpread(QGradient::RepeatSpread); // 重复渐变
// linearGradient.setSpread(QGradient::PadSpread); // 使用最近使用的颜色进行填充 默认值
// linearGradient.setSpread(QGradient::ReflectSpread); // 反射渐变
/*使用渐变作为画刷*/
painter.setBrush(linearGradient);
/* 7 绘制线性渐变*/
painter.drawRect(10, 170, 90, 40);
/* 8 辐射渐变*/
QRadialGradient radialGradient(QPointF(200, 190), 50, QPointF(275, 200));
radialGradient.setColorAt(0, QColor(255, 255, 100, 150));
radialGradient.setColorAt(1, QColor(0, 0, 0, 50));
painter.setBrush(radialGradient);
painter.drawEllipse(QPointF(200, 190), 50, 50);
/* 9 锥形渐变 */
QConicalGradient conicalGradient(QPointF(350, 190), 60);
conicalGradient.setColorAt(0.2, Qt::cyan);
conicalGradient.setColorAt(0.5, Qt::blue);
conicalGradient.setColorAt(0.9, Qt::black);
painter.setBrush(conicalGradient);
painter.drawEllipse(QPointF(350, 190), 50, 50);
/* 10 画笔使用线性渐变来绘制直线和文字 */
painter.setPen(QPen(linearGradient,2));
painter.drawLine(0, 280, 100, 280);
painter.drawText(150, 280, tr("helloQt!"));
}
void Widget::paintEvent(QPaintEvent *event)
{
QPainter painter(this);
//绘制线条
painter.drawLine(QPoint(0, 0), QPoint(100, 100));
//创建画笔
QPen pen(Qt::green, 5, Qt::DotLine, Qt::RoundCap, Qt::RoundJoin);
//使用画笔
painter.setPen(pen);
QRectF rectangle(70.0, 40.0, 80.0, 60.0);
int startAngle = 30 * 16;
int spanAngle = 120 * 16;
//绘制圆弧
painter.drawArc(rectangle, startAngle, spanAngle);
//重新设置画笔
pen.setWidth(1);
pen.setStyle(Qt::SolidLine);
painter.setPen(pen);
//绘制一个矩形
painter.drawRect(160, 20, 50, 40);
//创建画刷
QBrush brush(QColor(0, 0, 255), Qt::Dense4Pattern);
//使用画刷
painter.setBrush(brush);
//绘制椭圆
painter.drawEllipse(220, 20, 50, 50);
//设置纹理
brush.setTexture(QPixmap("../myDrawing/yafeilinux.png"));
//重新使用画刷
painter.setBrush(brush);
//定义四个点
static const QPointF points[4] = {
QPointF(270.0, 80.0),
QPointF(290.0, 10.0),
QPointF(350.0, 30.0),
QPointF(390.0, 70.0)
};
//使用四个点绘制多边形
painter.drawPolygon(points, 4);
//使用画刷填充一个矩形区域
painter.fillRect(QRect(10, 100, 150, 20), QBrush(Qt::darkYellow));
//擦除一个矩形区域的内容
painter.eraseRect(QRect(50, 0, 50, 120));
//线性渐变
QLinearGradient linearGradient(QPointF(40, 190), QPointF(70, 190));
//插入颜色
linearGradient.setColorAt(0, Qt::yellow);
linearGradient.setColorAt(0.5, Qt::red);
linearGradient.setColorAt(1, Qt::green);
//指定渐变区域以外的区域的扩散方式
linearGradient.setSpread(QGradient::RepeatSpread);
//使用渐变作为画刷
painter.setBrush(linearGradient);
painter.drawRect(10, 170, 90, 40);
//辐射渐变
QRadialGradient radialGradient(QPointF(200, 190), 50, QPointF(275, 200));
radialGradient.setColorAt(0, QColor(255, 255, 100, 150));
radialGradient.setColorAt(1, QColor(0, 0, 0, 50));
painter.setBrush(radialGradient);
painter.drawEllipse(QPointF(200, 190), 50, 50);
//锥形渐变
QConicalGradient conicalGradient(QPointF(350, 190), 60);
conicalGradient.setColorAt(0.2, Qt::cyan);
conicalGradient.setColorAt(0.9, Qt::black);
painter.setBrush(conicalGradient);
painter.drawEllipse(QPointF(350, 190), 50, 50);
//画笔使用线性渐变来绘制直线和文字
painter.setPen(QPen(linearGradient,2));
painter.drawLine(0, 280, 100, 280);
painter.drawText(150, 280, tr("helloQt!"));
}
