void GraphController::initCursorParameters() {
double x = std::round((interactiveCurveViewRange()->xMin()+interactiveCurveViewRange()->xMax())/2.0);
selectFunctionWithCursor(0);
TextFieldDelegateApp * myApp = (TextFieldDelegateApp *)app();
int functionIndex = 0;
double y = 0;
do {
Sequence * firstFunction = m_sequenceStore->activeFunctionAtIndex(functionIndex++);
y = firstFunction->evaluateAtAbscissa(x, myApp->localContext());
} while (std::isnan(y) && functionIndex < m_sequenceStore->numberOfActiveFunctions());
m_cursor->moveTo(x, y);
m_graphRange->panToMakePointVisible(x, y, k_cursorTopMarginRatio, k_cursorRightMarginRatio, k_cursorBottomMarginRatio, k_cursorLeftMarginRatio);
}
bool GraphController::moveCursorHorizontally(int direction) {
double xCursorPosition = std::round(m_cursor->x());
if (direction < 0 && xCursorPosition <= 0) {
return false;
}
/* The cursor moves by step of at minimum 1. If the windowRange is to large
* compared to the resolution, the cursor takes bigger round step to cross
* the window in approximatively resolution steps. */
double step = std::ceil((interactiveCurveViewRange()->xMax()-interactiveCurveViewRange()->xMin())/m_view.resolution());
step = step < 1.0 ? 1.0 : step;
double x = direction > 0 ? xCursorPosition + step:
xCursorPosition - step;
if (x < 0.0) {
return false;
}
Sequence * s = m_sequenceStore->activeFunctionAtIndex(indexFunctionSelectedByCursor());
TextFieldDelegateApp * myApp = (TextFieldDelegateApp *)app();
double y = s->evaluateAtAbscissa(x, myApp->localContext());
m_cursor->moveTo(x, y);
m_graphRange->panToMakePointVisible(x, y, k_cursorTopMarginRatio, k_cursorRightMarginRatio, k_cursorBottomMarginRatio, k_cursorLeftMarginRatio);
return true;
}
double ValuesController::evaluationOfAbscissaAtColumn(double abscissa, int columnIndex) {
Function * function = functionAtColumn(columnIndex);
TextFieldDelegateApp * myApp = (TextFieldDelegateApp *)app();
return function->evaluateAtAbscissa(abscissa, myApp->localContext());
}
