void ScaleEngine::autoScale (int maxNumSteps, double &x1, double &x2, double &stepSize) const
{
if (!hasBreak() || testAttribute(QwtScaleEngine::Inverted)){
QwtScaleEngine *engine;
if (d_type == QwtScaleTransformation::Log10)
engine = new QwtLog10ScaleEngine();
else
engine = new QwtLinearScaleEngine();
engine->setAttributes(attributes());
engine->setReference(reference());
engine->setMargins(loMargin(), hiMargin());
engine->autoScale(maxNumSteps, x1, x2, stepSize);
delete engine;
} else {
QwtScaleEngine *engine;
if (d_type == QwtScaleTransformation::Log10)
engine = new QwtLog10ScaleEngine();
else
engine = new QwtLinearScaleEngine();
engine->setAttributes(attributes());
double breakLeft = d_break_left;
engine->autoScale(maxNumSteps, x1, breakLeft, stepSize);
delete engine;
engine = new QwtLinearScaleEngine();
engine->setAttributes(attributes());
double breakRight = d_break_right;
engine->autoScale(maxNumSteps, breakRight, x2, stepSize);
delete engine;
}
}
void ScaleEngine::autoScale (int maxNumSteps, double &x1, double &x2, double &stepSize) const
{
if (!hasBreak() || testAttribute(QwtScaleEngine::Inverted)){
QwtScaleEngine *engine = newScaleEngine();
engine->setAttributes(attributes());
engine->setReference(reference());
engine->setMargins(lowerMargin(), upperMargin());
if (type() == ScaleTransformation::Log10 || type() == ScaleTransformation::Ln || type() == ScaleTransformation::Log2){
if (x1 <= 0.0)
x1 = LOG_MIN;
if (x2 <= 0.0)
x2 = LOG_MIN;
}
engine->autoScale(maxNumSteps, x1, x2, stepSize);
delete engine;
} else {
QwtScaleEngine *engine = newScaleEngine();
engine->setAttributes(attributes());
double breakLeft = d_break_left;
engine->autoScale(maxNumSteps, x1, breakLeft, stepSize);
delete engine;
engine = new QwtLinearScaleEngine();
engine->setAttributes(attributes());
double breakRight = d_break_right;
engine->autoScale(maxNumSteps, breakRight, x2, stepSize);
delete engine;
}
}