//! [0]
def paintEvent(self, paintEvent):
    painter = QPainter(self)
    painter.setPen(Qt.blue)
    painter.setFont(QFont("Arial", 30))
    painter.drawText(rect(), Qt.AlignCenter, "Qt")
//! [0]


//! [1]
def paintEvent(self, paintEvent):
    p = QPainter()
    p.begin(self)
    p.drawLine(...)         # drawing code
    p.end()
//! [1]


//! [2]
self paintEvent(self, paintEvent):
    p = QPainter(self)
    p.drawLine(...)         # drawing code

//! [2]


//! [3]
painter.begin(0)  # impossible - paint device cannot be 0

image = QPixmap(0, 0)
painter.begin(&image) # impossible - image.isNull() == true

painter.begin(myWidget)
painter2.begin(myWidget) # impossible - only one painter at a time
//! [3]


//! [4]
def rotate(self, angle):
    matrix = QMatrix()
    matrix.rotate(angle)
    setWorldMatrix(matrix, true)
//! [4]


//! [5]
path = QPainterPath()
path.moveTo(20, 80)
path.lineTo(20, 30)
path.cubicTo(80, 0, 50, 50, 80, 80)

painter = QPainter(self)
painter.drawPath(path)
//! [5]


//! [6]
line = QLineF(10.0, 80.0, 90.0, 20.0)

painter = QPainter(self)
painter.drawLine(line)
//! [6]


//! [7]
rectangle = QRectF(10.0, 20.0, 80.0, 60.0)

painter = QPainter(self)
painter.drawRect(rectangle)
//! [7]


//! [8]
rectangle = QRectF(10.0, 20.0, 80.0, 60.0)

painter = QPainter(self)
painter.drawRoundedRect(rectangle, 20.0, 15.0)
//! [8]


//! [9]
rectangle = QRectF(10.0, 20.0, 80.0, 60.0)

painter = QPainter(self)
painter.drawEllipse(rectangle)
//! [9]


//! [10]
rectangle = QRectF(10.0, 20.0, 80.0, 60.0)
startAngle = 30 * 16
spanAngle = 120 * 16

painter = QPainter(self)
painter.drawArc(rectangle, startAngle, spanAngle)
//! [10]


//! [11]
rectangle = QRectF(10.0, 20.0, 80.0, 60.0)
startAngle = 30 * 16
spanAngle = 120 * 16

painter = QPainter(self)
painter.drawPie(rectangle, startAngle, spanAngle)
//! [11]


//! [12]
rectangle = QRectF(10.0, 20.0, 80.0, 60.0)
startAngle = 30 * 16
spanAngle = 120 * 16

painter = QPainter(self)
painter.drawChord(rect, startAngle, spanAngle)
//! [12]


//! [13]
points = [
    QPointF(10.0, 80.0),
    QPointF(20.0, 10.0),
    QPointF(80.0, 30.0),
]

painter = QPainter(self)
painter.drawPolyline(points, 3)
//! [13]


//! [14]
points = [
    QPointF(10.0, 80.0),
    QPointF(20.0, 10.0),
    QPointF(80.0, 30.0),
    QPointF(90.0, 70.0)
]

painter = QPainter(self)
painter.drawPolygon(points, 4)
//! [14]


//! [15]
points = [
    QPointF(10.0, 80.0),
    QPointF(20.0, 10.0),
    QPointF(80.0, 30.0),
    QPointF(90.0, 70.0)
]

painter = QPainter(self)
painter.drawConvexPolygon(points, 4)
//! [15]


//! [16]
target = QRectF(10.0, 20.0, 80.0, 60.0)
source = QRectF(0.0, 0.0, 70.0, 40.0)
pixmap = QPixmap(":myPixmap.png")

painter = QPainter(self)
painter.drawPixmap(target, image, source)
//! [16]


//! [17]
painter = QPainter(self)
painter.drawText(rect, Qt.AlignCenter, tr("Qt by\nTrolltech"))
//! [17]


//! [18]
picture = QPicture()
point = QPointF(10.0, 20.0)
picture.load("drawing.pic")

painter = QPainter(self)
painter.drawPicture(0, 0, picture)
//! [18]


//! [19]
fillRect(rectangle, background())
//! [19]


//! [20]
target = QRectF(10.0, 20.0, 80.0, 60.0)
source = QRectF(0.0, 0.0, 70.0, 40.0)
image = QImage(":/images/myImage.png")

painter = QPainter(self)
painter.drawImage(target, image, source)
//! [20]

//! [21]
painter = QPainter(self)
painter.fillRect(0, 0, 128, 128, Qt.green)
painter.beginNativePainting()

glEnable(GL_SCISSOR_TEST)
glScissor(0, 0, 64, 64)

glClearColor(1, 0, 0, 1)
glClear(GL_COLOR_BUFFER_BIT)

glDisable(GL_SCISSOR_TEST)

painter.endNativePainting()
//! [21]