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29 lines
1.1 KiB
C++
29 lines
1.1 KiB
C++
#ifndef SHARED_FUNCTION_BANNER_DELEGATE_H
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#define SHARED_FUNCTION_BANNER_DELEGATE_H
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#include "function_store.h"
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#include "xy_banner_view.h"
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#include "curve_view_cursor.h"
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namespace Shared {
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class FunctionBannerDelegate {
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public:
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constexpr static int k_maxNumberOfCharacters = 50;
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/* getValueDisplayedOnBanner returns the value of t as displayed in the
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* banner, unless the difference from t exceeds deltaThreshold. If so,
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* return t. For instance, when a function is plotted between 1.000001 and
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* 1.000003, and the user goes to x = 1.000002, a small deltaThreshold
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* prevents him from being sent to x = 1
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* Note : Due to double encoding, not all values of t can be properly rounded.
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* For instance, x displayed as 0.01 can at best be encoded to x=0.010...02 */
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static double getValueDisplayedOnBanner(double t, Poincare::Context * context, double deltaThreshold, bool roundToZero = false);
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protected:
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void reloadBannerViewForCursorOnFunction(CurveViewCursor * cursor, Ion::Storage::Record record, FunctionStore * functionStore, Poincare::Context * context);
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virtual XYBannerView * bannerView() = 0;
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};
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}
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#endif
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