(1)畫刷風格
void TestWidget::paintBrushStyle(QPainter& painter)
{
list.clear();
list << "Qt::NoBrush" << "Qt::SolidPattern" << "Qt::Dense1Pattern" << "Qt::Dense2Pattern"
<< "Qt::Dense3Pattern" << "Qt::Dense4Pattern" << "Qt::Dense5Pattern"
<< "Qt::Dense6Pattern" << "Qt::Dense7Pattern" << "Qt::HorPattern"
<< "Qt::VerPattern" << "Qt::CrossPattern" << "Qt::BDiagPattern"
<< "Qt::FDiagPattern" << "Qt::DiagCrossPattern";
QBrush brush;
QRect rect;
int x = 10;
int y = 10;
for(int i=Qt::NoBrush; i <= Qt::DiagCrossPattern; i++)
{
brush.setStyle((Qt::BrushStyle)i);
painter.setBrush(brush);
rect.setRect(x, y, w, h);
painter.drawRect(rect);
painter.drawText(x, y + h + 15, list.at(i));
if((i+1)%4 == 0) {
x = 10;
y += h + h/2;
}
else
x += w + w/2;
}
}
![](https://img.laitimes.com/img/9ZDMuAjOiMmIsIjOiQnIsICdzFWRoRXdvN1LclHdpZXYyd2LcBzNvwVZ2x2bzNXak9CX90TQNNkRrFlQKBTSvwFbslmZvwFMwQzLcVmepNHdu9mZvwFVywUNMZTY18CX052bm9CX90TUkFHZtJGashEZ6ZFShZXUYpVd1kmYr50MZV3YyI2cKJDT29GRjBjUIF2LcRHelR3LcJzLctmch1mclRXY39TMykDMzcTNwIDOwEDM0EDMy8CX0Vmbu4GZzNmLn9Gbi1yZtl2Lc9CX6MHc0RHaiojIsJye.jpg)
(2)畫筆風格
void TestWidget::paintPenStyle(QPainter& painter)
{
list.clear();
list << "Qt::NoPen" << "Qt::SolidLine" << "Qt::DashLine" << "Qt::DotLine" << "Qt::DashDotLine"
<< "Qt::DashDotDotLine" << "Qt::CustomDashLine";
QPen pen;
pen.setWidth(4);
int y=10;
for(int i=Qt::NoPen; i <= Qt::CustomDashLine; i++)
{
pen.setStyle((Qt::PenStyle)i);
if(i==Qt::CustomDashLine)
{
QVector<qreal> dashes;
qreal space = 4;
dashes << 1 << space << 3 << space << 5 << space
<< 7 << space ;
pen.setDashPattern(dashes);
}
painter.setPen(pen);
painter.drawLine(10, y, 310, y);
painter.drawText(320, y+5, list.at(i));
y += 20;
}
}
(3)端點風格
void TestWidget::paintPenCapStyle(QPainter& painter)
{
QPen pen;
pen.setWidth(20);
pen.setCapStyle(Qt::SquareCap);
painter.setPen(pen);
painter.drawLine(30, 50, 210, 50);
painter.drawText(250, 55, "Qt::SquareCap");
pen.setCapStyle(Qt::FlatCap);
painter.setPen(pen);
painter.drawLine(30, 100, 210, 100);
painter.drawText(250, 105, "Qt::FlatCap");
pen.setCapStyle(Qt::RoundCap);
painter.setPen(pen);
painter.drawLine(30, 150, 210, 150);
painter.drawText(250, 155, "Qt::RoundCap");
}
(4)連結風格
void TestWidget::paintPenJoinStyle(QPainter& painter)
{
list.clear();
list << "Qt::BevelJoin" << "Qt::MiterJoin" << "Qt::RoundJoin" << "Qt::SvgMiterJoin";
QVector<Qt::PenJoinStyle> joinStyle;
joinStyle << Qt::MiterJoin << Qt::BevelJoin << Qt::RoundJoin << Qt::SvgMiterJoin;
QPointF points[3] = {
QPointF(10.0, 30.0),
QPointF(80.0, 70.0),
QPointF(10.0, 110.0),
};
qreal dx = 150;
qreal dy = 0;
QPen pen;
pen.setWidth(20);
for(short i=0; i<4; i++)
{
painter.translate(dx, dy);
pen.setJoinStyle(joinStyle[i]);
painter.setPen(pen);
painter.drawPolyline(points, 3);
painter.drawText(0, 150, list[i]);
}
}
(5)漸變填充
void TestWidget::paintGradient(QPainter& painter)
{
painter.translate(10, 10);
QLinearGradient linearGradient(0, 0, 200, 100);
linearGradient.setColorAt(0, Qt::red);
linearGradient.setColorAt(0.5, Qt::green);
linearGradient.setColorAt(1, Qt::blue);
painter.setBrush(linearGradient);
painter.drawRect(0, 0, 200, 100);
painter.translate(0, 150);
QRadialGradient radialGradient(50, 50, 50, 30, 30); // cx, cy, radius, fx, fy
radialGradient.setColorAt(0.2, Qt::cyan);
radialGradient.setColorAt(0.8, Qt::yellow);
radialGradient.setColorAt(1, Qt::magenta);
painter.setBrush(radialGradient);
painter.drawEllipse(0, 0, 100, 100);
painter.translate(0, 150);
QConicalGradient conicalGradient(60, 40, 30); // cx, cy, angle
conicalGradient.setColorAt(0, Qt::gray);
conicalGradient.setColorAt(0.4, Qt::darkGreen);
conicalGradient.setColorAt(0.6, Qt::darkMagenta);
conicalGradient.setColorAt(1, Qt::darkBlue);
painter.setBrush(conicalGradient);
painter.drawEllipse(0, 0, 100, 100);
}