611 lines
16 KiB
Groff
611 lines
16 KiB
Groff
.TH "QwtPainter" 3 "Sun Jul 18 2021" "Version 6.2.0" "Qwt User's Guide" \" -*- nroff -*-
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.ad l
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.nh
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.SH NAME
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QwtPainter \- A collection of QPainter workarounds\&.
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.SH SYNOPSIS
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.br
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.PP
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.PP
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\fC#include <qwt_painter\&.h>\fP
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.SS "Static Public Member Functions"
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.in +1c
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.ti -1c
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.RI "static void \fBsetPolylineSplitting\fP (bool)"
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.br
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.RI "En/Disable line splitting for the raster paint engine\&. "
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.ti -1c
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.RI "static bool \fBpolylineSplitting\fP ()"
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.br
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.ti -1c
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.RI "static void \fBsetRoundingAlignment\fP (bool)"
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.br
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.ti -1c
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.RI "static bool \fBroundingAlignment\fP ()"
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.br
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.ti -1c
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.RI "static bool \fBroundingAlignment\fP (const QPainter *)"
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.br
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.ti -1c
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.RI "static void \fBdrawText\fP (QPainter *, qreal x, qreal y, const QString &)"
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.br
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.RI "Wrapper for QPainter::drawText() "
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.ti -1c
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.RI "static void \fBdrawText\fP (QPainter *, const QPointF &, const QString &)"
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.br
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.RI "Wrapper for QPainter::drawText() "
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.ti -1c
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.RI "static void \fBdrawText\fP (QPainter *, qreal x, qreal y, qreal w, qreal h, int flags, const QString &)"
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.br
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.RI "Wrapper for QPainter::drawText() "
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.ti -1c
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.RI "static void \fBdrawText\fP (QPainter *, const QRectF &, int flags, const QString &)"
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.br
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.RI "Wrapper for QPainter::drawText() "
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.ti -1c
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.RI "static void \fBdrawSimpleRichText\fP (QPainter *, const QRectF &, int flags, const QTextDocument &)"
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.br
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.ti -1c
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.RI "static void \fBdrawRect\fP (QPainter *, qreal x, qreal y, qreal w, qreal h)"
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.br
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.RI "Wrapper for QPainter::drawRect() "
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.ti -1c
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.RI "static void \fBdrawRect\fP (QPainter *, const QRectF &rect)"
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.br
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.RI "Wrapper for QPainter::drawRect() "
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.ti -1c
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.RI "static void \fBfillRect\fP (QPainter *, const QRectF &, const QBrush &)"
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.br
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.RI "Wrapper for QPainter::fillRect() "
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.ti -1c
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.RI "static void \fBdrawEllipse\fP (QPainter *, const QRectF &)"
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.br
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.RI "Wrapper for QPainter::drawEllipse() "
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.ti -1c
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.RI "static void \fBdrawPie\fP (QPainter *, const QRectF &r, int a, int alen)"
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.br
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.RI "Wrapper for QPainter::drawPie() "
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.ti -1c
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.RI "static void \fBdrawLine\fP (QPainter *, qreal x1, qreal y1, qreal x2, qreal y2)"
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.br
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.RI "Wrapper for QPainter::drawLine() "
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.ti -1c
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.RI "static void \fBdrawLine\fP (QPainter *, const QPointF &p1, const QPointF &p2)"
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.br
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.RI "Wrapper for QPainter::drawLine() "
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.ti -1c
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.RI "static void \fBdrawLine\fP (QPainter *, const QLineF &)"
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.br
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.RI "Wrapper for QPainter::drawLine() "
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.ti -1c
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.RI "static void \fBdrawPolygon\fP (QPainter *, const QPolygonF &)"
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.br
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.RI "Wrapper for QPainter::drawPolygon() "
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.ti -1c
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.RI "static void \fBdrawPolyline\fP (QPainter *, const QPolygonF &)"
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.br
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.RI "Wrapper for QPainter::drawPolyline() "
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.ti -1c
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.RI "static void \fBdrawPolyline\fP (QPainter *, const QPointF *, int pointCount)"
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.br
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.RI "Wrapper for QPainter::drawPolyline() "
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.ti -1c
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.RI "static void \fBdrawPolygon\fP (QPainter *, const QPolygon &)"
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.br
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.RI "Wrapper for QPainter::drawPolygon() "
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.ti -1c
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.RI "static void \fBdrawPolyline\fP (QPainter *, const QPolygon &)"
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.br
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.RI "Wrapper for QPainter::drawPolyline() "
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.ti -1c
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.RI "static void \fBdrawPolyline\fP (QPainter *, const QPoint *, int pointCount)"
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.br
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.RI "Wrapper for QPainter::drawPolyline() "
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.ti -1c
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.RI "static void \fBdrawPoint\fP (QPainter *, const QPoint &)"
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.br
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.RI "Wrapper for QPainter::drawPoint() "
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.ti -1c
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.RI "static void \fBdrawPoints\fP (QPainter *, const QPolygon &)"
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.br
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.RI "Wrapper for QPainter::drawPoints() "
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.ti -1c
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.RI "static void \fBdrawPoints\fP (QPainter *, const QPoint *, int pointCount)"
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.br
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.RI "Wrapper for QPainter::drawPoints() "
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.ti -1c
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.RI "static void \fBdrawPoint\fP (QPainter *, qreal x, qreal y)"
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.br
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.RI "Wrapper for QPainter::drawPoint() "
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.ti -1c
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.RI "static void \fBdrawPoint\fP (QPainter *, const QPointF &)"
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.br
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.RI "Wrapper for QPainter::drawPoint() "
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.ti -1c
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.RI "static void \fBdrawPoints\fP (QPainter *, const QPolygonF &)"
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.br
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.RI "Wrapper for QPainter::drawPoints() "
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.ti -1c
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.RI "static void \fBdrawPoints\fP (QPainter *, const QPointF *, int pointCount)"
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.br
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.RI "Wrapper for QPainter::drawPoints() "
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.ti -1c
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.RI "static void \fBdrawPath\fP (QPainter *, const QPainterPath &)"
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.br
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.RI "Wrapper for QPainter::drawPath() "
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.ti -1c
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.RI "static void \fBdrawImage\fP (QPainter *, const QRectF &, const QImage &)"
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.br
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.RI "Wrapper for QPainter::drawImage() "
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.ti -1c
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.RI "static void \fBdrawPixmap\fP (QPainter *, const QRectF &, const QPixmap &)"
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.br
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.RI "Wrapper for QPainter::drawPixmap() "
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.ti -1c
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.RI "static void \fBdrawRoundFrame\fP (QPainter *, const QRectF &, const QPalette &, int lineWidth, int frameStyle)"
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.br
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.ti -1c
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.RI "static void \fBdrawRoundedFrame\fP (QPainter *, const QRectF &, qreal xRadius, qreal yRadius, const QPalette &, int lineWidth, int frameStyle)"
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.br
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.ti -1c
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.RI "static void \fBdrawFrame\fP (QPainter *, const QRectF &rect, const QPalette &palette, QPalette::ColorRole foregroundRole, int lineWidth, int midLineWidth, int frameStyle)"
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.br
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.ti -1c
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.RI "static void \fBdrawFocusRect\fP (QPainter *, const QWidget *)"
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.br
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.RI "Draw a focus rectangle on a widget using its style\&. "
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.ti -1c
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.RI "static void \fBdrawFocusRect\fP (QPainter *, const QWidget *, const QRect &)"
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.br
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.RI "Draw a focus rectangle on a widget using its style\&. "
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.ti -1c
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.RI "static void \fBdrawColorBar\fP (QPainter *, const \fBQwtColorMap\fP &, const \fBQwtInterval\fP &, const \fBQwtScaleMap\fP &, Qt::Orientation, const QRectF &)"
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.br
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.ti -1c
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.RI "static bool \fBisAligning\fP (const QPainter *)"
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.br
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.ti -1c
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.RI "static bool \fBisX11GraphicsSystem\fP ()"
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.br
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.ti -1c
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.RI "static void \fBfillPixmap\fP (const QWidget *, QPixmap &, const QPoint &offset=QPoint())"
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.br
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.ti -1c
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.RI "static void \fBdrawBackgound\fP (QPainter *, const QRectF &, const QWidget *)"
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.br
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.ti -1c
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.RI "static QPixmap \fBbackingStore\fP (QWidget *, const QSize &)"
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.br
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.ti -1c
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.RI "static qreal \fBdevicePixelRatio\fP (const QPaintDevice *)"
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.br
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.ti -1c
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.RI "static qreal \fBeffectivePenWidth\fP (const QPen &)"
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.br
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.ti -1c
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.RI "static int \fBhorizontalAdvance\fP (const QFontMetrics &, const QString &)"
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.br
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.ti -1c
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.RI "static qreal \fBhorizontalAdvance\fP (const QFontMetricsF &, const QString &)"
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.br
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.ti -1c
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.RI "static int \fBhorizontalAdvance\fP (const QFontMetrics &, QChar)"
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.br
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.ti -1c
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.RI "static qreal \fBhorizontalAdvance\fP (const QFontMetricsF &, QChar)"
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.br
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.ti -1c
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.RI "static QFont \fBscaledFont\fP (const QFont &, const QPaintDevice *=nullptr)"
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.br
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.in -1c
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.SH "Detailed Description"
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.PP
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A collection of QPainter workarounds\&.
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.PP
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Definition at line 36 of file qwt_painter\&.h\&.
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.SH "Member Function Documentation"
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.PP
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.SS "QPixmap QwtPainter::backingStore (QWidget * widget, const QSize & size)\fC [static]\fP"
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.PP
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\fBReturns\fP
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.RS 4
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A pixmap that can be used as backing store
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.RE
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.PP
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\fBParameters\fP
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.RS 4
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\fIwidget\fP Widget, for which the backingstore is intended
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.br
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\fIsize\fP Size of the pixmap
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.RE
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.PP
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.PP
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Definition at line 1525 of file qwt_painter\&.cpp\&.
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.SS "qreal QwtPainter::devicePixelRatio (const QPaintDevice * paintDevice)\fC [static]\fP"
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.PP
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\fBReturns\fP
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.RS 4
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Pixel ratio for a paint device
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.RE
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.PP
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\fBParameters\fP
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.RS 4
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\fIpaintDevice\fP Paint device
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.RE
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.PP
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.PP
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Definition at line 1491 of file qwt_painter\&.cpp\&.
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.SS "void QwtPainter::drawBackgound (QPainter * painter, const QRectF & rect, const QWidget * widget)\fC [static]\fP"
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Fill rect with the background of a widget
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.PP
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\fBParameters\fP
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.RS 4
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\fIpainter\fP Painter
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.br
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\fIrect\fP Rectangle to be filled
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.br
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\fIwidget\fP Widget
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.RE
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.PP
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\fBSee also\fP
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.RS 4
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QStyle::PE_Widget, QWidget::backgroundRole()
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.RE
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.PP
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.PP
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Definition at line 1351 of file qwt_painter\&.cpp\&.
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.SS "void QwtPainter::drawColorBar (QPainter * painter, const \fBQwtColorMap\fP & colorMap, const \fBQwtInterval\fP & interval, const \fBQwtScaleMap\fP & scaleMap, Qt::Orientation orientation, const QRectF & rect)\fC [static]\fP"
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Draw a color bar into a rectangle
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.PP
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\fBParameters\fP
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.RS 4
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\fIpainter\fP Painter
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.br
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\fIcolorMap\fP Color map
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.br
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\fIinterval\fP Value range
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.br
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\fIscaleMap\fP Scale map
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.br
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\fIorientation\fP Orientation
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.br
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\fIrect\fP Target rectangle
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.RE
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.PP
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.PP
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Definition at line 1205 of file qwt_painter\&.cpp\&.
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.SS "void QwtPainter::drawFrame (QPainter * painter, const QRectF & rect, const QPalette & palette, QPalette::ColorRole foregroundRole, int frameWidth, int midLineWidth, int frameStyle)\fC [static]\fP"
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Draw a rectangular frame
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.PP
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\fBParameters\fP
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.RS 4
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\fIpainter\fP Painter
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.br
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\fIrect\fP Frame rectangle
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.br
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\fIpalette\fP Palette
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.br
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\fIforegroundRole\fP Foreground role used for QFrame::Plain
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.br
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\fIframeWidth\fP Frame width
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.br
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\fImidLineWidth\fP Used for QFrame::Box
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.br
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\fIframeStyle\fP bitwise OR´ed value of QFrame::Shape and QFrame::Shadow
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.RE
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.PP
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.PP
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Definition at line 911 of file qwt_painter\&.cpp\&.
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.SS "void QwtPainter::drawRoundedFrame (QPainter * painter, const QRectF & rect, qreal xRadius, qreal yRadius, const QPalette & palette, int lineWidth, int frameStyle)\fC [static]\fP"
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Draw a rectangular frame with rounded borders
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.PP
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\fBParameters\fP
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.RS 4
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\fIpainter\fP Painter
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.br
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\fIrect\fP Frame rectangle
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.br
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\fIxRadius\fP x-radius of the ellipses defining the corners
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.br
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\fIyRadius\fP y-radius of the ellipses defining the corners
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.br
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\fIpalette\fP QPalette::WindowText is used for plain borders QPalette::Dark and QPalette::Light for raised or sunken borders
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.br
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\fIlineWidth\fP Line width
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.br
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\fIframeStyle\fP bitwise OR´ed value of QFrame::Shape and QFrame::Shadow
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.RE
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.PP
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.PP
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Definition at line 1065 of file qwt_painter\&.cpp\&.
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.SS "void QwtPainter::drawRoundFrame (QPainter * painter, const QRectF & rect, const QPalette & palette, int lineWidth, int frameStyle)\fC [static]\fP"
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Draw a round frame
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.PP
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\fBParameters\fP
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.RS 4
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\fIpainter\fP Painter
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.br
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\fIrect\fP Frame rectangle
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.br
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\fIpalette\fP QPalette::WindowText is used for plain borders QPalette::Dark and QPalette::Light for raised or sunken borders
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.br
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\fIlineWidth\fP Line width
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.br
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\fIframeStyle\fP bitwise OR´ed value of QFrame::Shape and QFrame::Shadow
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.RE
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.PP
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.PP
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Definition at line 845 of file qwt_painter\&.cpp\&.
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.SS "void QwtPainter::drawSimpleRichText (QPainter * painter, const QRectF & rect, int flags, const QTextDocument & text)\fC [static]\fP"
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Draw a text document into a rectangle
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.PP
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\fBParameters\fP
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.RS 4
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\fIpainter\fP Painter
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.br
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\fIrect\fP Target rectangle
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.br
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\fIflags\fP Alignments/Text flags, see QPainter::drawText()
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.br
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\fItext\fP Text document
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.RE
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.PP
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.PP
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Definition at line 489 of file qwt_painter\&.cpp\&.
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.SS "qreal QwtPainter::effectivePenWidth (const QPen & pen)\fC [inline]\fP, \fC [static]\fP"
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.PP
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\fBReturns\fP
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.RS 4
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pen\&.widthF() expanded to at least 1\&.0
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.RE
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.PP
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\fBParameters\fP
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.RS 4
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\fIpen\fP Pen
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.RE
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.PP
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.PP
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Definition at line 201 of file qwt_painter\&.h\&.
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.SS "void QwtPainter::fillPixmap (const QWidget * widget, QPixmap & pixmap, const QPoint & offset = \fCQPoint()\fP)\fC [static]\fP"
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Fill a pixmap with the content of a widget
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.PP
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In Qt >= 5\&.0 QPixmap::fill() is a nop, in Qt 4\&.x it is buggy for backgrounds with gradients\&. Thus \fBfillPixmap()\fP offers an alternative implementation\&.
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.PP
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\fBParameters\fP
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.RS 4
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\fIwidget\fP Widget
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.br
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\fIpixmap\fP Pixmap to be filled
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.br
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\fIoffset\fP Offset
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.RE
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.PP
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\fBSee also\fP
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.RS 4
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QPixmap::fill()
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.RE
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.PP
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.PP
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Definition at line 1311 of file qwt_painter\&.cpp\&.
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.SS "int QwtPainter::horizontalAdvance (const QFontMetrics & fontMetrics, const QString & text)\fC [static]\fP"
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Distance appropriate for drawing a subsequent character after text\&.
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.PP
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\fBParameters\fP
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.RS 4
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\fIfontMetrics\fP Font metrics
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.br
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\fItext\fP Text
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.RE
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.PP
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\fBReturns\fP
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.RS 4
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horizontal advance in pixels
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.RE
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.PP
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.PP
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Definition at line 1379 of file qwt_painter\&.cpp\&.
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.SS "int QwtPainter::horizontalAdvance (const QFontMetrics & fontMetrics, QChar ch)\fC [static]\fP"
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Distance appropriate for drawing a subsequent character after ch\&.
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.PP
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\fBParameters\fP
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.RS 4
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\fIfontMetrics\fP Font metrics
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.br
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\fIch\fP Character
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.RE
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.PP
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\fBReturns\fP
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.RS 4
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horizontal advance in pixels
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.RE
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.PP
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.PP
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Definition at line 1414 of file qwt_painter\&.cpp\&.
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.SS "qreal QwtPainter::horizontalAdvance (const QFontMetricsF & fontMetrics, const QString & text)\fC [static]\fP"
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Distance appropriate for drawing a subsequent character after text\&.
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.PP
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\fBParameters\fP
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.RS 4
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\fIfontMetrics\fP Font metrics
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.br
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\fItext\fP Text
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.RE
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.PP
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\fBReturns\fP
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.RS 4
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horizontal advance in pixels
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.RE
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.PP
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.PP
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Definition at line 1397 of file qwt_painter\&.cpp\&.
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.SS "qreal QwtPainter::horizontalAdvance (const QFontMetricsF & fontMetrics, QChar ch)\fC [static]\fP"
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Distance appropriate for drawing a subsequent character after ch\&.
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.PP
|
||
\fBParameters\fP
|
||
.RS 4
|
||
\fIfontMetrics\fP Font metrics
|
||
.br
|
||
\fIch\fP Character
|
||
.RE
|
||
.PP
|
||
\fBReturns\fP
|
||
.RS 4
|
||
horizontal advance in pixels
|
||
.RE
|
||
.PP
|
||
|
||
.PP
|
||
Definition at line 1431 of file qwt_painter\&.cpp\&.
|
||
.SS "bool QwtPainter::isAligning (const QPainter * painter)\fC [static]\fP"
|
||
Check if the painter is using a paint engine, that aligns coordinates to integers\&. Today these are all paint engines beside QPaintEngine::Pdf and QPaintEngine::SVG\&.
|
||
.PP
|
||
If we have an integer based paint engine it is also checked if the painter has a transformation matrix, that rotates or scales\&.
|
||
.PP
|
||
\fBParameters\fP
|
||
.RS 4
|
||
\fIpainter\fP Painter
|
||
.RE
|
||
.PP
|
||
\fBReturns\fP
|
||
.RS 4
|
||
true, when the painter is aligning
|
||
.RE
|
||
.PP
|
||
\fBSee also\fP
|
||
.RS 4
|
||
\fBsetRoundingAlignment()\fP
|
||
.RE
|
||
.PP
|
||
|
||
.PP
|
||
Definition at line 267 of file qwt_painter\&.cpp\&.
|
||
.SS "bool QwtPainter::isX11GraphicsSystem ()\fC [static]\fP"
|
||
Check is the application is running with the X11 graphics system that has some special capabilities that can be used for incremental painting to a widget\&.
|
||
.PP
|
||
\fBReturns\fP
|
||
.RS 4
|
||
True, when the graphics system is X11
|
||
.RE
|
||
.PP
|
||
|
||
.PP
|
||
Definition at line 233 of file qwt_painter\&.cpp\&.
|
||
.SS "bool QwtPainter::polylineSplitting ()\fC [inline]\fP, \fC [static]\fP"
|
||
|
||
.PP
|
||
\fBReturns\fP
|
||
.RS 4
|
||
True, when line splitting for the raster paint engine is enabled\&.
|
||
.RE
|
||
.PP
|
||
\fBSee also\fP
|
||
.RS 4
|
||
\fBsetPolylineSplitting()\fP
|
||
.RE
|
||
.PP
|
||
|
||
.PP
|
||
Definition at line 170 of file qwt_painter\&.h\&.
|
||
.SS "bool QwtPainter::roundingAlignment ()\fC [inline]\fP, \fC [static]\fP"
|
||
Check whether coordinates should be rounded, before they are painted to a paint engine that rounds to integer values\&. For other paint engines ( PDF, SVG ), this flag has no effect\&.
|
||
.PP
|
||
\fBReturns\fP
|
||
.RS 4
|
||
True, when rounding is enabled
|
||
.RE
|
||
.PP
|
||
\fBSee also\fP
|
||
.RS 4
|
||
\fBsetRoundingAlignment()\fP, \fBisAligning()\fP
|
||
.RE
|
||
.PP
|
||
|
||
.PP
|
||
Definition at line 183 of file qwt_painter\&.h\&.
|
||
.SS "bool QwtPainter::roundingAlignment (const QPainter * painter)\fC [inline]\fP, \fC [static]\fP"
|
||
|
||
.PP
|
||
\fBReturns\fP
|
||
.RS 4
|
||
\fBroundingAlignment()\fP && isAligning(painter);
|
||
.RE
|
||
.PP
|
||
\fBParameters\fP
|
||
.RS 4
|
||
\fIpainter\fP Painter
|
||
.RE
|
||
.PP
|
||
|
||
.PP
|
||
Definition at line 192 of file qwt_painter\&.h\&.
|
||
.SS "QFont QwtPainter::scaledFont (const QFont & font, const QPaintDevice * paintDevice = \fCnullptr\fP)\fC [static]\fP"
|
||
Adjust the DPI value of font according to the DPI value of the paint device
|
||
.PP
|
||
\fBParameters\fP
|
||
.RS 4
|
||
\fIfont\fP Unscaled font
|
||
.br
|
||
\fIpaintDevice\fP Paint device providing a DPI value\&. If paintDevice == null the DPI value of the primary screen will be used
|
||
.RE
|
||
.PP
|
||
\fBReturns\fP
|
||
.RS 4
|
||
Font being adjusted to the DPI value of the paint device
|
||
.RE
|
||
.PP
|
||
|
||
.PP
|
||
Definition at line 1450 of file qwt_painter\&.cpp\&.
|
||
.SS "void QwtPainter::setPolylineSplitting (bool enable)\fC [static]\fP"
|
||
|
||
.PP
|
||
En/Disable line splitting for the raster paint engine\&. In some Qt versions the raster paint engine paints polylines of many points much faster when they are split in smaller chunks: f\&.e all supported Qt versions >= Qt 5\&.0 when drawing an antialiased polyline with a pen width >=2\&.
|
||
.PP
|
||
Also the raster paint engine has a nasty bug in many versions ( Qt 4\&.8 - \&.\&.\&. ) for short lines ( https://codereview.qt-project.org/#/c/99456 ), that is worked around in this mode\&.
|
||
.PP
|
||
The default setting is true\&.
|
||
.PP
|
||
\fBSee also\fP
|
||
.RS 4
|
||
\fBpolylineSplitting()\fP
|
||
.RE
|
||
.PP
|
||
|
||
.PP
|
||
Definition at line 335 of file qwt_painter\&.cpp\&.
|
||
.SS "void QwtPainter::setRoundingAlignment (bool enable)\fC [static]\fP"
|
||
Enable whether coordinates should be rounded, before they are painted to a paint engine that floors to integer values\&. For other paint engines ( PDF, SVG ) this flag has no effect\&. \fBQwtPainter\fP stores this flag only, the rounding itself is done in the painting code ( f\&.e the plot items )\&.
|
||
.PP
|
||
The default setting is true\&.
|
||
.PP
|
||
\fBSee also\fP
|
||
.RS 4
|
||
\fBroundingAlignment()\fP, \fBisAligning()\fP
|
||
.RE
|
||
.PP
|
||
|
||
.PP
|
||
Definition at line 315 of file qwt_painter\&.cpp\&.
|
||
|
||
.SH "Author"
|
||
.PP
|
||
Generated automatically by Doxygen for Qwt User's Guide from the source code\&.
|