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[apps] Graph: create an IntersectionGraphController

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This commit is contained in:
Émilie Feral
2018-01-22 14:26:56 +01:00
committed by EmilieNumworks
parent 7d69e59562
commit 89c201a7f7
10 changed files with 92 additions and 13 deletions
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54
apps/graph/graph/intersection_graph_controller.cpp Normal file
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#include "intersection_graph_controller.h"
#include "../app.h"
using namespace Shared;
using namespace Poincare;
namespace Graph {
IntersectionGraphController::IntersectionGraphController(Responder * parentResponder, GraphView * graphView, BannerView * bannerView, Shared::InteractiveCurveViewRange * curveViewRange, CurveViewCursor * cursor, CartesianFunctionStore * store) :
CalculationGraphController(parentResponder, graphView, bannerView, curveViewRange, cursor, I18n::Message::NoIntersectionFound),
m_intersectedFunction(nullptr),
m_functionStore(store)
{
}
const char * IntersectionGraphController::title() {
return I18n::translate(I18n::Message::Intersection);
}
void IntersectionGraphController::reloadBannerView() {
m_bannerView->setNumberOfSubviews(2);
reloadBannerViewForCursorOnFunction(m_cursor, m_function, 'x');
char buffer[FunctionBannerDelegate::k_maxNumberOfCharacters+PrintFloat::bufferSizeForFloatsWithPrecision(Constant::LargeNumberOfSignificantDigits)];
const char * space = " ";
int spaceLength = strlen(space);
const char * legend = "0(x)=0(x)=";
int legendLength = strlen(legend);
int numberOfChar = 0;
strlcpy(buffer, legend, legendLength+1);
numberOfChar += legendLength;
buffer[0] = m_function->name()[0];
buffer[5] = m_intersectedFunction->name()[0];
numberOfChar += Complex<float>::convertFloatToText(m_cursor->y(), buffer+legendLength, PrintFloat::bufferSizeForFloatsWithPrecision(Constant::MediumNumberOfSignificantDigits), Constant::MediumNumberOfSignificantDigits);
strlcpy(buffer+numberOfChar, space, spaceLength+1);
buffer[FunctionBannerDelegate::k_maxDigitLegendLength+5] = 0;
bannerView()->setLegendAtIndex(buffer, 1);
}
CartesianFunction::Point IntersectionGraphController::computeNewPointOfInterest(double start, double step, double max, Context * context) {
CartesianFunction::Point result = {.abscissa = NAN, .value = NAN};
for (int i = 0; i < m_functionStore->numberOfActiveFunctions(); i++) {
Function * f = m_functionStore->activeFunctionAtIndex(i);
if (f != m_function) {
CartesianFunction::Point intersection = m_function->nextIntersectionFrom(start, step, max, context, f);
if ((std::isnan(result.abscissa) || std::fabs(intersection.abscissa-start) < std::fabs(result.abscissa-start)) && !std::isnan(intersection.abscissa)) {
m_intersectedFunction = f;
result = (std::isnan(result.abscissa) || std::fabs(intersection.abscissa-start) < std::fabs(result.abscissa-start)) ? intersection : result;
}
}
}
return result;
}
}