新增qwt源码版本

2019-11-07 10:56:33 +08:00
parent d9b38d7ecd
commit 4746999d0e
377 changed files with 81225 additions and 1 deletions
--- a/qwtdemo/qwt/qwt_point_polar.cpp
+++ b/qwtdemo/qwt/qwt_point_polar.cpp
@@ -0,0 +1,121 @@
+/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
+ * QwtPolar Widget Library
+ * Copyright (C) 2008   Uwe Rathmann
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the Qwt License, Version 1.0
+ *****************************************************************************/
+
+#include "qwt_point_polar.h"
+#include "qwt_math.h"
+
+#if QT_VERSION < 0x040601
+#define qAtan2(y, x) ::atan2(y, x)
+#endif
+
+/*!
+   Convert and assign values from a point in Cartesian coordinates
+
+   \param p Point in Cartesian coordinates
+   \sa setPoint(), toPoint()
+*/
+QwtPointPolar::QwtPointPolar( const QPointF &p )
+{
+    d_radius = qSqrt( qwtSqr( p.x() ) + qwtSqr( p.y() ) );
+    d_azimuth = qAtan2( p.y(), p.x() );
+}
+
+/*!
+   Convert and assign values from a point in Cartesian coordinates
+   \param p Point in Cartesian coordinates
+*/
+void QwtPointPolar::setPoint( const QPointF &p )
+{
+    d_radius = qSqrt( qwtSqr( p.x() ) + qwtSqr( p.y() ) );
+    d_azimuth = qAtan2( p.y(), p.x() );
+}
+
+/*!
+   Convert and return values in Cartesian coordinates
+
+   \return Converted point in Cartesian coordinates
+
+   \note Invalid or null points will be returned as QPointF(0.0, 0.0)
+   \sa isValid(), isNull()
+*/
+QPointF QwtPointPolar::toPoint() const
+{
+    if ( d_radius <= 0.0 )
+        return QPointF( 0.0, 0.0 );
+
+    const double x = d_radius * qCos( d_azimuth );
+    const double y = d_radius * qSin( d_azimuth );
+
+    return QPointF( x, y );
+}
+
+/*!
+    \brief Compare 2 points
+
+    Two points are equal to each other if radius and
+    azimuth-coordinates are the same. Points are not equal, when
+    the azimuth differs, but other.azimuth() == azimuth() % (2 * PI).
+
+    \return True if the point is equal to other; otherwise return false.
+
+    \sa normalized()
+*/
+bool QwtPointPolar::operator==( const QwtPointPolar &other ) const
+{
+    return d_radius == other.d_radius && d_azimuth == other.d_azimuth;
+}
+
+/*!
+    Compare 2 points
+
+    Two points are equal to each other if radius and
+    azimuth-coordinates are the same. Points are not equal, when
+    the azimuth differs, but other.azimuth() == azimuth() % (2 * PI).
+
+    \return True if the point is not equal to other; otherwise return false.
+    \sa normalized()
+*/
+bool QwtPointPolar::operator!=( const QwtPointPolar &other ) const
+{
+    return d_radius != other.d_radius || d_azimuth != other.d_azimuth;
+}
+
+/*!
+   Normalize radius and azimuth
+
+   When the radius is < 0.0 it is set to 0.0. The azimuth is
+   a value >= 0.0 and < 2 * M_PI.
+
+   \return Normalized point
+*/
+QwtPointPolar QwtPointPolar::normalized() const
+{
+    const double radius = qMax( d_radius, 0.0 );
+
+    double azimuth = d_azimuth;
+    if ( azimuth < -2.0 * M_PI || azimuth >= 2 * M_PI )
+        azimuth = ::fmod( d_azimuth, 2 * M_PI );
+
+    if ( azimuth < 0.0 )
+        azimuth += 2 * M_PI;
+
+    return QwtPointPolar( azimuth, radius );
+}
+
+#ifndef QT_NO_DEBUG_STREAM
+
+QDebug operator<<( QDebug debug, const QwtPointPolar &point )
+{
+    debug.nospace() << "QwtPointPolar(" 
+        << point.azimuth() << "," << point.radius() << ")";
+
+    return debug.space();
+}
+
+#endif
+