qwtautoscale.3

linux下qt的第三方的一个类

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\fBQwtAutoScale::setMaxMinor()\fP 
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Definition at line 81 of file qwt_autoscl.cpp.
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Referenced by QwtPlot::axisMaxMinor().
.SS "bool QwtAutoScale::option (int opt) const"
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Returns TRUE if the specified option is set. 
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\fBParameters:\fP
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\fIopt\fP Option 
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\fBQwtAutoScale::setOptions()\fP 
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Definition at line 697 of file qwt_autoscl.cpp.
.SS "int QwtAutoScale::options () const"
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options 
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\fBQwtAutoScale::setOptions()\fP, \fBQwtAutoScale::option()\fP 
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Definition at line 707 of file qwt_autoscl.cpp.
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Referenced by QwtPlot::axisOptions().
.SS "double QwtAutoScale::reference () const"
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the reference value 
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\fBQwtAutoScale::setOptions()\fP, \fBQwtAutoScale::option()\fP 
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Definition at line 686 of file qwt_autoscl.cpp.
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Referenced by QwtPlot::axisReference().
.SS "void QwtAutoScale::reset ()"
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Set the interval boundaries to zero and clear the scale division. 
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This member function resets an AutoScale object to its initial state. It is needed to clean up the scale before or after subsequent \fBadjust()\fP calls. The boundaries of the scale are set to zero and the scale division is cleared.
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A reset doesn't affect the margins. 
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Definition at line 413 of file qwt_autoscl.cpp.
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References QwtScaleDiv::reset().
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Referenced by QwtPlot::updateAxes().
.SS "const \fBQwtScaleDiv\fP & QwtAutoScale::scaleDiv () const"
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The scale division consists of two boundary values, an array of major tickmarks and an array of minor tickmarks. 
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a const reference to the scale division 
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\fBQwtScaleDiv\fP 
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Definition at line 720 of file qwt_autoscl.cpp.
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Referenced by QwtPlot::axisScale(), QwtPlot::canvasMap(), and QwtPlot::print().
.SS "void QwtAutoScale::setAutoRebuild (bool tf)"
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If true, rebuild scale automatically with call to 'adjust' 
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\fBQwtAutoScale::autoRebuild()\fP 
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Definition at line 730 of file qwt_autoscl.cpp.
.SS "void QwtAutoScale::setAutoScale ()"
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Enable auto-scaling. 
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This function is used to switch back to auto-scaling mode if the scale has been frozen temporarily (see \fBsetScale()\fP).
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When auto-scaling is reactivated, the scale will be rebuild, which means that .PD 0

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if adjust or setMaxIntv have been called in between, the scale will be adjusted to the new conditions. 
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if none of these functions and no reset has been called, the old state will be restored. 
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if only reset has been called in between, nothing will happen.
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\fBQwtAutoScale::setScale()\fP 
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Definition at line 439 of file qwt_autoscl.cpp.
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References build().
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Referenced by QwtPlot::setAxisAutoScale().
.SS "void QwtAutoScale::setMargins (double mlo, double mhi)"
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Specify margins at the scale's endpoints. 
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\fBParameters:\fP
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\fImlo\fP minimum distance between the scale's lower boundary and the smallest enclosed value 
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\fImhi\fP minimum distance between the scale's upper boundary and the greatest enclosed value
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Margins can be used to leave a minimum amount of space between the enclosed intervals and the boundaries of the scale.
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With logarithmic scales, the margins are measured in decades. 
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The margins will not be changed by any other member function. You should remember this when you call \fBreset()\fP or change from a linear to a logarithmic scale. 
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Definition at line 461 of file qwt_autoscl.cpp.
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References build().
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Referenced by QwtPlot::setAxisMargins().
.SS "void QwtAutoScale::setMaxMajor (int mx)"
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Specify the maximum number of major intervals. 
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\fBParameters:\fP
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\fImx\fP maximum number of subintervals
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The auto-scaler places the major ticks at reasonable points, such that the number of major tick intervals does not exceed the specified maximum number. Definition at line 477 of file qwt_autoscl.cpp.
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References build().
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Referenced by QwtPlot::setAxisMaxMajor().
.SS "void QwtAutoScale::setMaxMinor (int mx)"
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Specify the maximum number of minor subdivisions within major scale intervals. 
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\fBParameters:\fP
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\fImx\fP maximum number of minor ticks 
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Definition at line 489 of file qwt_autoscl.cpp.
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References build().
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Referenced by QwtPlot::setAxisMaxMinor().
.SS "void QwtAutoScale::setOptions (int opt)"
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Reset scale options and set specified options. 
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\fBParameters:\fP
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\fIopt\fP Combined set of options
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The behaviour of the auto-scaling algorithm can be changed with the following options: 
.IP "\fBQwtAutoScale::None \fP" 1c
Switch all options off. 
.IP "\fBQwtAutoscale::IncludeRef \fP" 1c
Build a scale which includes the reference value. 
.IP "\fBQwtAutoScale::Symmetric \fP" 1c
Build a scale which is symmetric to the reference value. 
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Build a logarithmic scale. 
.IP "\fBQwtAutoScale::Floating \fP" 1c
The endpoints of the scale are supposed to be equal the outmost included values plus the specified margins (see \fBsetMargins()\fP). If this option is not* set, the endpoints of the scale will be integer multiples of the step size. 
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Turn the scale upside down. 
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\fBWarning:\fP
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If the type of scale division is changed from logarithmic to linear or vice versa, the margins will not be transformed. Note that the margins count in decades if the scale is logarithmic. 
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If a linear scale contains negative values, switching to a logarithmic scale will cut them off and set the lower scale boundary to its lowest possible value of 1.0E-100. This effect is reversible if you switch back to a linear scale. 
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The options have no effect while auto-scaling is turned off (see \fBsetScale()\fP)
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Example:
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#include '../include/qwt_autoscl.h>

void main() 
{
    QwtAutoScale as;

    // build linear scale with default settings
    as.adjust(17.45, 87344.0);

    //...

    // change to logarithmic scale with floating ends
    as.setOptions(QwtAutoScale::Floating | QwtAutoscale::Logarithmic);

    //...

    // change to linear, zero-symmetric scale
    as.setOptions(QwtAutoScale::ZeroSymmetric);

    //...
}

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\fBQwtAutoScale::changeOptions()\fP for a description of the possible \fBoptions\fP. 
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Definition at line 649 of file qwt_autoscl.cpp.
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References build().
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Referenced by QwtPlot::setAxisOptions().
.SS "void QwtAutoScale::setRange (double x1, double x2)\fC [protected]\fP"
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Specify a user-defined range. 
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\fBParameters:\fP
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\fIx1\fP user-defined lower boundary 
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\fIx2\fP user-defined upper boundary
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if x1 > x2, the lower boundary will be set to x2 and the upper boundary to x1. 
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if x1 == x2, the auto-scaler sets the boundaries to (-0.5, 0.5) for linear scales and to (LOG_MIN, LOG_MAX) for logarithmic scales.
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\fBQwtAutoScale::setScale()\fP, \fBLOG_MIN\fP, \fBLOG_MAX\fP. 
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Definition at line 510 of file qwt_autoscl.cpp.
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References LOG_MAX, and LOG_MIN.
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Referenced by buildLinScale(), buildLogScale(), and setScale().
.SS "void QwtAutoScale::setReference (double r)"
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Specify a reference point. 
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\fBParameters:\fP
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\fIr\fP new reference value
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The reference point is needed if the auto-scaler options IncludeRef or Symmetric are active. Its default value is 0 for linear scales and 1 for logarithmic scales.
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The reference value for logarithmic scales is limited to ( LOG_MIN / 2 <= reference <= LOG_MAX /2 ). If the specified value is less than LOG_MIN, it will be set to 1.0 for logarithmic scales.
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\fBLOG_MIN\fP, \fBLOG_MAX\fP. 
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Definition at line 670 of file qwt_autoscl.cpp.
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References build(), LOG_MAX, and LOG_MIN.
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Referenced by QwtPlot::setAxisReference().
.SS "void QwtAutoScale::setScale (double xmin, double xmax, double step = \fC0.0\fP)"
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Specify a user-defined scale and switch off auto-scaling. 
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\fBParameters:\fP
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\fIxmin\fP user-defined lower boundary 
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\fIxmax\fP user-defined upper boundary 
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\fIstep\fP user-defined fixed major step size
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A fixed scale may be used for different purposes, e.g. zooming. If the step argument is left out or less or equal to zero, the auto-scaler will calculate the major step size size according to the maxMajor setting.
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The fixed-scale mode can switched off using \fBsetAutoScale()\fP, which restores the previous values.
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if xmin > xmax, the lower boundary will be set to xmax and the upper boundary to xmin. 
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if xmin == xmax, the auto-scaler sets the boundaries to (-0.5, 0.5) for linear scales and to (LOG_MIN, LOG_MAX) for logarithmic scales. 
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Options and margins have no effect while auto-scaling is switched off.
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\fBQwtAutoScale::setMaxMajor()\fP, \fBQwtAutoScale::setAutoScale()\fP, \fBLOG_MIN\fP, \fBLOG_MAX\fP. 
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Definition at line 576 of file qwt_autoscl.cpp.
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References build(), and setRange().
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Referenced by QwtPlot::setAxisScale().

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