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# Qt 3 Support Members for QPainter

The following class members are part of the Qt 3 support layer. They are provided to help you port old code to Qt 4. We advise against using them in new code.

- QPainter class reference

### Public Functions

- const QColor & backgroundColor () const
- bool begin ( QPaintDevice * device, const QWidget * init )
- QRect boundingRect ( const QRect & rectangle, int flags, const QString & text, int length )
- QRect boundingRect ( int x, int y, int width, int height, int flags, const QString & text, int length )
- void drawConvexPolygon ( const QPolygonF & polygon, int index, int count = -1 )
- void drawConvexPolygon ( const QPolygon & polygon, int index, int count = -1 )
- void drawCubicBezier ( const QPolygon & controlPoints, int index = 0 )
- void drawLineSegments ( const QPolygon & polygon, int index = 0, int count = -1 )
- void drawPoints ( const QPolygon & polygon, int index, int count = -1 )
- void drawPolygon ( const QPolygonF & polygon, bool winding, int index = 0, int count = -1 )
- void drawPolygon ( const QPolygon & polygon, bool winding, int index = 0, int count = -1 )
- void drawPolyline ( const QPolygon & polygon, int index, int count = -1 )
- void drawText ( int x, int y, const QString & text, int pos, int length )
- void drawText ( const QPoint & point, const QString & text, int pos, int length )
- void drawText ( int x, int y, const QString & text, int length )
- void drawText ( const QPoint & point, const QString & text, int length )
- void drawText ( const QRect & rectangle, int flags, const QString & text, int length, QRect * br = 0 )
- void drawText ( int x, int y, int width, int height, int flags, const QString & text, int length, QRect * br = 0 )
- bool hasViewXForm () const
- bool hasWorldXForm () const
- void resetXForm ()
- void setBackgroundColor ( const QColor & color )
- void setViewXForm ( bool enabled )
- void setWorldXForm ( bool enabled )
- qreal translationX () const
- qreal translationY () const
- QPoint xForm ( const QPoint & point ) const
- QRect xForm ( const QRect & rectangle ) const
- QPolygon xForm ( const QPolygon & polygon ) const
- QPolygon xForm ( const QPolygon & polygon, int index, int count ) const
- QPoint xFormDev ( const QPoint & point ) const
- QRect xFormDev ( const QRect & rectangle ) const
- QPolygon xFormDev ( const QPolygon & polygon ) const
- QPolygon xFormDev ( const QPolygon & polygon, int index, int count ) const

### Static Public Members

- void redirect ( QPaintDevice * pdev, QPaintDevice * replacement )
- QPaintDevice * redirect ( QPaintDevice * pdev )

## Member Function Documentation

### const QColor & QPainter::backgroundColor () const

Use background() and QBrush::color() instead.

For example, if you have code like

     QColor myColor = backgroundColor();

you can rewrite it as

     QColor myColor = background().color();

Note that the background can be a complex brush such as a texture or a gradient.

See also setBackgroundColor().

### bool QPainter::begin ( QPaintDevice * device, const QWidget * init )

Use begin() instead.

If the paint device is a QWidget, QPainter is initialized after the widget's settings automatically. Otherwise, you must call the initFrom() function to initialize the painters pen, background and font to the same as any given widget.

For example, if you have code like

     QPainter painter(this);
     painter.begin(device, init);

you can rewrite it as

     QPainter painter(this);
     painter.begin(device);
     painter.initFrom(init);

### QRect QPainter::boundingRect ( const QRect & rectangle, int flags, const QString & text, int length )

Returns the bounding rectangle for the given length of the text constrained by the provided rectangle.

Use boundingRect() combined with QString::left() instead.

For example, if you have code like

     QRect rectangle = boundingRect(rect, flags, text, length);

you can rewrite it as

     QRect rectangle = boundingRect(rect, flags, text.left(length));

### QRect QPainter::boundingRect ( int x, int y, int width, int height, int flags, const QString & text, int length )

Returns the bounding rectangle for the given length of the text constrained by the rectangle that begins at point (x, y) with the given width and height.

Use boundingRect() combined with QString::left() instead.

For example, if you have code like

     QRect rectangle = boundingRect(x, y, width, height, flags, text, length);

you can rewrite it as

     QRect rectangle = boundingRect(x, y, width, height, flags, text.left(length));

### void QPainter::drawConvexPolygon ( const QPolygonF & polygon, int index, int count = -1 )

This is an overloaded member function, provided for convenience.

Use drawConvexPolygon() combined with QPolygonF::constData() instead.

For example, if you have code like

     QPainter painter(this);
     painter.drawConvexPolygon(polygon, index, count);

you can rewrite it as

     int pointCount = (count == -1) ?  polygon.size() - index : count;

     QPainter painter(this);
     painter.drawConvexPolygon(polygon.constData() + index, pointCount);

### void QPainter::drawConvexPolygon ( const QPolygon & polygon, int index, int count = -1 )

This is an overloaded member function, provided for convenience.

Use drawConvexPolygon() combined with QPolygon::constData() instead.

For example, if you have code like

     QPainter painter(this);
     painter.drawConvexPolygon(polygon, index, count);

you can rewrite it as

     int pointCount = (count == -1) ?  polygon.size() - index : count;

     QPainter painter(this);
     painter.drawConvexPolygon(polygon.constData() + index, pointCount);

### void QPainter::drawCubicBezier ( const QPolygon & controlPoints, int index = 0 )

Draws a cubic Bezier curve defined by the controlPoints, starting at controlPoints[index] (index defaults to 0). Points after controlPoints[index + 3] are ignored. Nothing happens if there aren't enough control points.

Use strokePath() instead.

For example, if you have code like

     QPainter painter(this);
     painter.drawCubicBezier(controlPoints, index)

you can rewrite it as

     QPainterPath path;
     path.moveTo(controlPoints.at(index));
     path.cubicTo(controlPoints.at(index+1),
                         controlPoints.at(index+2),
                         controlPoints.at(index+3));

     QPainter painter(this);
     painter.strokePath(path, painter.pen());

### void QPainter::drawLineSegments ( const QPolygon & polygon, int index = 0, int count = -1 )

Draws count separate lines from points defined by the polygon, starting at polygon[index] (index defaults to 0). If count is -1 (the default) all points until the end of the array are used.

Use drawLines() combined with QPolygon::constData() instead.

For example, if you have code like

     QPainter painter(this);
     painter.drawLineSegments(polygon, index, count);

you can rewrite it as

     int lineCount = (count == -1) ?  (polygon.size() - index) / 2  : count;

     QPainter painter(this);
     painter.drawLines(polygon.constData() + index * 2, lineCount);

### void QPainter::drawPoints ( const QPolygon & polygon, int index, int count = -1 )

This is an overloaded member function, provided for convenience.

Draws count points in the vector polygon starting on index using the current pen.

Use drawPoints() combined with QPolygon::constData() instead.

For example, if you have code like

     QPainter painter(this);
     painter.drawPoints(polygon, index, count);

you can rewrite it as

     int pointCount = (count == -1) ?  polygon.size() - index : count;

     QPainter painter(this);
     painter.drawPoints(polygon.constData() + index, pointCount);

### void QPainter::drawPolygon ( const QPolygonF & polygon, bool winding, int index = 0, int count = -1 )

This is an overloaded member function, provided for convenience.

Use drawPolygon() combined with QPolygonF::constData() instead.

For example, if you have code like

     QPainter painter(this);
     painter.drawPolygon(polygon, winding, index, count);

you can rewrite it as

     int pointCount = (count == -1) ?  polygon.size() - index : count;
     int fillRule = winding ? Qt::WindingFill : Qt::OddEvenFill;

     QPainter painter(this);
     painter.drawPolygon( polygon.constData() + index, pointCount, fillRule);

### void QPainter::drawPolygon ( const QPolygon & polygon, bool winding, int index = 0, int count = -1 )

This is an overloaded member function, provided for convenience.

Use drawPolygon() combined with QPolygon::constData() instead.

For example, if you have code like

     QPainter painter(this);
     painter.drawPolygon(polygon, winding, index, count);

you can rewrite it as

     int pointCount = (count == -1) ?  polygon.size() - index : count;
     int fillRule = winding ? Qt::WindingFill : Qt::OddEvenFill;

     QPainter painter(this);
     painter.drawPolygon( polygon.constData() + index, pointCount, fillRule);

### void QPainter::drawPolyline ( const QPolygon & polygon, int index, int count = -1 )

This is an overloaded member function, provided for convenience.

Draws the polyline defined by the count lines of the given polygon starting at index (index defaults to 0).

Use drawPolyline() combined with QPolygon::constData() instead.

For example, if you have code like

     QPainter painter(this);
     painter.drawPolyline(polygon, index, count);

you can rewrite it as

     int pointCount = (count == -1) ?  polygon.size() - index : count;

     QPainter painter(this);
     painter.drawPolyline(polygon.constData() + index, pointCount);

### void QPainter::drawText ( int x, int y, const QString & text, int pos, int length )

Use drawText() combined with QString::mid() instead.

For example, if you have code like

     QPainter painter(this);
     painter.drawText(x, y, text, pos, length);

you can rewrite it as

     QPainter painter(this);
     painter.drawText(x, y, text.mid(pos, length));

### void QPainter::drawText ( const QPoint & point, const QString & text, int pos, int length )

Use drawText() combined with QString::mid() instead.

For example, if you have code like

     QPainter painter(this);
     painter.drawText(point, text, pos, length);

you can rewrite it as

     QPainter painter(this);
     painter.drawText(point, text.mid(pos, length));

### void QPainter::drawText ( int x, int y, const QString & text, int length )

Use drawText() combined with QString::left() instead.

For example, if you have code like

     QPainter painter(this);
     painter.drawText(x, y, text, length);

you can rewrite it as

     QPainter painter(this);
     painter.drawText(x, y, text.left(length));

### void QPainter::drawText ( const QPoint & point, const QString & text, int length )

Use drawText() combined with QString::left() instead.

For example, if you have code like

     QPainter painter(this);
     painter.drawText(point, text, length);

you can rewrite it as

     QPainter painter(this);
     painter.drawText(point, text.left(length));

### void QPainter::drawText ( const QRect & rectangle, int flags, const QString & text, int length, QRect * br = 0 )

Use drawText() combined with QString::left() instead.

For example, if you have code like

     QPainter painter(this);
     painter.drawText(rectangle, flags, text, length, br );

you can rewrite it as

     QPainter painter(this);
     painter.drawText(rectangle, flags, text.left(length), br );

### void QPainter::drawText ( int x, int y, int width, int height, int flags, const QString & text, int length, QRect * br = 0 )

Use drawText() combined with QString::left() instead.

For example, if you have code like

     QPainter painter(this);
     painter.drawText(x, y, width, height, flags, text, length, br );

you can rewrite it as

     QPainter painter(this);
     painter.drawText(x, y, width, height, flags, text.left(length), br );

### bool QPainter::hasViewXForm () const

Use viewTransformEnabled() instead.

### bool QPainter::hasWorldXForm () const

Use worldMatrixEnabled() instead.

### void QPainter::redirect ( QPaintDevice * pdev, QPaintDevice * replacement ) `[static]`

Use setRedirected() instead.

### QPaintDevice * QPainter::redirect ( QPaintDevice * pdev ) `[static]`

Use redirected() instead.

### void QPainter::resetXForm ()

Use resetMatrix() instead.

### void QPainter::setBackgroundColor ( const QColor & color )

Use setBackground() instead.

See also backgroundColor().

### void QPainter::setViewXForm ( bool enabled )

Use setViewTransformEnabled() instead.

See also hasViewXForm().

### void QPainter::setWorldXForm ( bool enabled )

Use setWorldMatrixEnabled() instead.

See also hasWorldXForm().

### qreal QPainter::translationX () const

Use the worldMatrix() combined with QMatrix::dx() instead.

For example, if you have code like

     QPainter painter(this);
     qreal x = painter.translationX();

you can rewrite it as

     QPainter painter(this);
     qreal x = painter.worldMatrix().dx();

### qreal QPainter::translationY () const

Use the worldMatrix() combined with QMatrix::dy() instead.

For example, if you have code like

     QPainter painter(this);
     qreal y = painter.translationY();

you can rewrite it as

     QPainter painter(this);
     qreal y = painter.worldMatrix().dy();

### QPoint QPainter::xForm ( const QPoint & point ) const

Use combinedTransform() instead.

### QRect QPainter::xForm ( const QRect & rectangle ) const

This is an overloaded member function, provided for convenience.

Use combinedTransform() instead of this function and call mapRect() on the result to obtain a QRect.

### QPolygon QPainter::xForm ( const QPolygon & polygon ) const

This is an overloaded member function, provided for convenience.

Use combinedTransform() instead.

### QPolygon QPainter::xForm ( const QPolygon & polygon, int index, int count ) const

This is an overloaded member function, provided for convenience.

Use combinedTransform() combined with QPolygon::mid() instead.

For example, if you have code like

     QPainter painter(this);
     QPolygon transformed = painter.xForm(polygon, index, count)

you can rewrite it as

     QPainter painter(this);
     QPolygon transformed = polygon.mid(index, count) * painter.combinedMatrix();

### QPoint QPainter::xFormDev ( const QPoint & point ) const

This is an overloaded member function, provided for convenience.

Use combinedTransform() combined with QMatrix::inverted() instead.

For example, if you have code like

     QPainter painter(this);
     QPoint transformed = painter.xFormDev(point);

you can rewrite it as

     QPainter painter(this);
     QPoint transformed = point * painter.combinedMatrix().inverted();

### QRect QPainter::xFormDev ( const QRect & rectangle ) const

This is an overloaded member function, provided for convenience.

Use combineMatrix() combined with QMatrix::inverted() instead.

For example, if you have code like

     QPainter painter(this);
     QRect transformed = painter.xFormDev(rectangle);

you can rewrite it as

     QPainter painter(this);
     QRect transformed = rectangle * painter.combinedMatrix().inverted();

### QPolygon QPainter::xFormDev ( const QPolygon & polygon ) const

This is an overloaded member function, provided for convenience.

This is an overloaded member function, provided for convenience.

Use combinedMatrix() combined with QMatrix::inverted() instead.

For example, if you have code like

     QPainter painter(this);
     QPolygon transformed = painter.xFormDev(rectangle);

you can rewrite it as

     QPainter painter(this);
     QPolygon transformed = polygon * painter.combinedMatrix().inverted();

### QPolygon QPainter::xFormDev ( const QPolygon & polygon, int index, int count ) const

This is an overloaded member function, provided for convenience.

Use combinedMatrix() combined with QPolygon::mid() and QMatrix::inverted() instead.

For example, if you have code like

     QPainter painter(this);
     QPolygon transformed = painter.xFormDev(polygon, index, count);

you can rewrite it as

     QPainter painter(this);
     QPolygon transformed = polygon.mid(index, count) * painter.combinedMatrix().inverted();