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[graph] Change cursor initial position

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The cursor now initially aligns with the grid, and tries to avoid points
where the function is not defined.

Change-Id: Ie3b304281f5848102c2f3c0aa5c031b351418186
This commit is contained in:
Gabriel Ozouf
2020-11-16 12:18:13 +01:00
committed by EmilieNumworks
parent 3ac3fba468
commit 5e679b7bc8
1 changed files with 14 additions and 2 deletions
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16
apps/shared/function_graph_controller.cpp
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@@ -68,9 +68,21 @@ void FunctionGraphController::reloadBannerView() {
reloadBannerViewForCursorOnFunction(m_cursor, record, functionStore(), AppsContainer::sharedAppsContainer()->globalContext());
}
double FunctionGraphController::defaultCursorT(Ion::Storage::Record record) {
return (interactiveCurveViewRange()->xMin()+interactiveCurveViewRange()->xMax())/2.0f;
Poincare::Context * context = textFieldDelegateApp()->localContext();
ExpiringPointer<Function> function = functionStore()->modelForRecord(record);
float gridUnit = 2 * interactiveCurveViewRange()->xGridUnit();
float yMin = interactiveCurveViewRange()->yMin(), yMax = interactiveCurveViewRange()->yMax();
float middle = (interactiveCurveViewRange()->xMin()+interactiveCurveViewRange()->xMax())/2.0f;
float resLeft = gridUnit * std::floor(middle / gridUnit);
float yLeft = function->evaluateXYAtParameter(resLeft, context).x2();
float resRight = resLeft + gridUnit;
float yRight = function->evaluateXYAtParameter(resRight, context).x2();
if ((yMin < yLeft && yLeft < yMax) || !(yMin < yRight && yRight < yMax)) {
return resLeft;
}
return resRight;
}
FunctionStore * FunctionGraphController::functionStore() const {