C++ (Cpp) QwtScaleEngine::autoScale Examples

Example #1

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;
	}
}

Example #2

File: ScaleEngine.cpp Project: kuzavas/qtiplot

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;
	}
}