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39 lines
1.9 KiB
C++
39 lines
1.9 KiB
C++
#include "graph_controller_helper.h"
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#include "../../shared/function_banner_delegate.h"
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#include "../app.h"
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#include "../../shared/poincare_helpers.h"
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#include <poincare/preferences.h>
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using namespace Shared;
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using namespace Poincare;
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namespace Graph {
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bool GraphControllerHelper::privateMoveCursorHorizontally(Shared::CurveViewCursor * cursor, int direction, Shared::InteractiveCurveViewRange * range, int numberOfStepsInGradUnit, Ion::Storage::Record record) {
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ExpiringPointer<CartesianFunction> function = App::app()->functionStore()->modelForRecord(record);
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double xCursorPosition = cursor->x();
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double x = xCursorPosition + (direction > 0 ? 1.0 : -1.0) * range->xGridUnit()/numberOfStepsInGradUnit;
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double y = function->evaluateAtAbscissa(x, App::app()->localContext());
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cursor->moveTo(x, y);
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return true;
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}
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void GraphControllerHelper::reloadDerivativeInBannerViewForCursorOnFunction(Shared::CurveViewCursor * cursor, Ion::Storage::Record record) {
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ExpiringPointer<CartesianFunction> function = App::app()->functionStore()->modelForRecord(record);
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constexpr size_t bufferSize = FunctionBannerDelegate::k_maxNumberOfCharacters+PrintFloat::bufferSizeForFloatsWithPrecision(Preferences::LargeNumberOfSignificantDigits);
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char buffer[bufferSize];
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const char * space = " ";
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int numberOfChar = function->derivativeNameWithArgument(buffer, bufferSize, CartesianFunction::Symbol());
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const char * legend = "=";
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assert(numberOfChar <= bufferSize);
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numberOfChar += strlcpy(buffer+numberOfChar, legend, bufferSize-numberOfChar);
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double y = function->approximateDerivative(cursor->x(), App::app()->localContext());
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numberOfChar += PoincareHelpers::ConvertFloatToText<double>(y, buffer + numberOfChar, bufferSize-numberOfChar, Preferences::ShortNumberOfSignificantDigits);
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assert(numberOfChar <= bufferSize);
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strlcpy(buffer+numberOfChar, space, bufferSize-numberOfChar);
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bannerView()->derivativeView()->setText(buffer);
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bannerView()->reload();
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}
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}
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