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;
}
}
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;
}
}
QwtScaleDiv ScaleEngine::divideScale(double x1, double x2, int maxMajSteps,
int maxMinSteps, double stepSize) const
{
QwtScaleEngine *engine;
if (!hasBreak()){
engine = newScaleEngine();
QwtScaleDiv div = engine->divideScale(x1, x2, maxMajSteps, maxMinSteps, stepSize);
delete engine;
return div;
}
double lb = d_break_left;
double rb = d_break_right;
double step1 = d_step_before;
double step2 = d_step_after;
if (x1 > x2){
lb = d_break_right;
rb = d_break_left;
step1 = d_step_after;
step2 = d_step_before;
if (d_log10_scale_after)
engine = new QwtLog10ScaleEngine();
else
engine = new QwtLinearScaleEngine();
} else
engine = newScaleEngine();
int max_min_intervals = d_minor_ticks_before;
if (d_minor_ticks_before == 1)
max_min_intervals = 3;
if (d_minor_ticks_before > 1)
max_min_intervals = d_minor_ticks_before + 1;
QwtScaleDiv div1 = engine->divideScale(x1, lb, maxMajSteps/2, max_min_intervals, step1);
max_min_intervals = d_minor_ticks_after;
if (d_minor_ticks_after == 1)
max_min_intervals = 3;
if (d_minor_ticks_after > 1)
max_min_intervals = d_minor_ticks_after + 1;
delete engine;
if (testAttribute(QwtScaleEngine::Inverted))
engine = newScaleEngine();
else if (d_log10_scale_after)
engine = new QwtLog10ScaleEngine();
else
engine = new QwtLinearScaleEngine();
QwtScaleDiv div2 = engine->divideScale(rb, x2, maxMajSteps/2, max_min_intervals, step2);
QwtValueList ticks[QwtScaleDiv::NTickTypes];
ticks[QwtScaleDiv::MinorTick] = div1.ticks(QwtScaleDiv::MinorTick) + div2.ticks(QwtScaleDiv::MinorTick);
ticks[QwtScaleDiv::MediumTick] = div1.ticks(QwtScaleDiv::MediumTick) + div2.ticks(QwtScaleDiv::MediumTick);
ticks[QwtScaleDiv::MajorTick] = div1.ticks(QwtScaleDiv::MajorTick) + div2.ticks(QwtScaleDiv::MajorTick);
delete engine;
return QwtScaleDiv(x1, x2, ticks);
}
