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//=========================================================
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// $Id: sclif.cpp,v 1.1 2002/01/30 14:54:03 muse Exp $
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// Copyright (C) 1997 Josef Wilgen
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License, version 2,
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// as published by the Free Software Foundation.
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// (C) Copyright 2000 Werner Schweer (ws@seh.de)
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//=========================================================
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// ScaleIf - An interface class for widgets containing a scale
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// This interface class is used to provide classes
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// with a protected ScaleDraw member and a public
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// interface to access that scale.
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// The primary purpose of this class is to define
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// a common interface for classes which are supposed to
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// contain a ScaleDraw class. It provides a protected
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// called d_scale and a couple of public member functions
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// which allow direct but restricted access
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// to this scale by the user.
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// Widgets derived from this class have
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// to implement the member function scaleChange(),
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// which is called to notify changes of the
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// scale parameters and usually requires repainting or
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// resizing respectively.
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// In general, a class derived from ScaleIf is
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// expected to manage the division and the position of its scale internally
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// when no user-defined scale is set. It should take the d_maxMinor
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// and d_maxMajor members into account, which can be set by the user.
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// An implementation can check if a user-defined scale is set by calling the
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// @ScaleIf::hasUserScale@ member.
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//------------------------------------------------------------
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// Construct a ScaleIf instance
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//------------------------------------------------------------
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d_scale.setScale(0.0,100.0,d_maxMajor, d_maxMinor);
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//------------------------------------------------------------
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// ScaleIf::setScale (1)
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// Specify a user-defined scale.
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// void ScaleIf::setScale(double vmin, double vmax, int logarithmic)
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// double vmin, double vmax -- boundary values
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// int logarithmic -- If != 0, Build a logarithmic scale
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// By default, the widget is supposed to control the range of its scale
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// automatically, but sometimes it is desirable to have a user-defined
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// scale which is not in sync with
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// the widget's range, e.g. if a logarithmic scale is needed
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// (sliders don't support that) or if the scale is required
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// to have a fixed range (say 0...100%), independent of the
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// @ScaleIf::autoScale@
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//------------------------------------------------------------
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void ScaleIf::setScale(double vmin, double vmax, int logarithmic)
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setScale(vmin,vmax,0.0,logarithmic);
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//------------------------------------------------------------
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// ScaleIf::setScale (2)
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// Specify a user-defined scale.
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// void ScaleIf::setScale(double vmin, double vmax, int logarithmic)
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// double vmin, double vmax -- interval boundaries
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// int step -- major step size
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// int logarithmic -- If != 0, build a logarithmic scale
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// By default, the widget is supposed to control the range of its scale
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// automatically, but sometimes it is desirable to have a user-defined
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// scale which is not in sync with
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// the widget's range, e.g. if a logarithmic scale is needed
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// (sliders don't support that) or if the scale is required
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// to have a fixed range (say 0...100%), independent of the
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//------------------------------------------------------------
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void ScaleIf::setScale(double vmin, double vmax, double step, int logarithmic)
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ScaleDiv oldscl(d_scale.scaleDiv());
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d_scale.setScale(vmin, vmax, d_maxMajor, d_maxMinor, step, logarithmic);
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if (oldscl != d_scale.scaleDiv())
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//------------------------------------------------------------
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// Assign a user-defined scale division
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// void Scale::setScale(const ScaleDiv &s)
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// const ScaleDiv &s -- scale division
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//------------------------------------------------------------
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void ScaleIf::setScale(const ScaleDiv &s)
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//------------------------------------------------------------
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// ScaleIf::autoScale
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// Advise the widget to control the scale range
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// void ScaleIf::autoScale
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// Autoscaling is on by default.
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//------------------------------------------------------------
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void ScaleIf::autoScale()
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//------------------------------------------------------------
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// ScaleIf::setScaleMaxMajor
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// Set the maximum number of major tick intervals.
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// void ScaleIf::setScaleMaxMajor(int ticks)
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// int ticks -- maximal number of major ticks.
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// The scale's major ticks are calculated automatically such that
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// the number of major intervals does not exceed <ticks>.
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// The default value is 5.
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//------------------------------------------------------------
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void ScaleIf::setScaleMaxMajor(int ticks)
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if (ticks != d_maxMajor) {
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d_scale.setScale(d_scale.scaleDiv().lBound(), d_scale.scaleDiv().hBound(),
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d_maxMajor, d_maxMinor, 0.0,d_scale.scaleDiv().logScale());
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//------------------------------------------------------------
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// ScaleIf::setScaleMaxMinor
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// Set the maximum number of minor tick intervals
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// void ScaleIf::setScaleMaxMinor(int ticks)
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// The scale's minor ticks are calculated automatically such that
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// the number of minor intervals does not exceed <ticks>.
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// The default value is 3.
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//------------------------------------------------------------
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void ScaleIf::setScaleMaxMinor(int ticks)
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if ( ticks != d_maxMinor) {
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d_scale.setScale(d_scale.scaleDiv().lBound(), d_scale.scaleDiv().hBound(),
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d_maxMajor, d_maxMinor, 0.0, d_scale.scaleDiv().logScale());
added
removed
widgets/sclif.cpp
