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ad6edffc07
The ability to perform a range search without changing the X range was only there to accomodate the Yauto feature. Change-Id: I8c2b61b447fbd3dc1f4e303dff06d1a8d6e7a4f2
100 lines
3.5 KiB
C++
100 lines
3.5 KiB
C++
#include "function.h"
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#include "range_1D.h"
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#include "poincare_helpers.h"
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#include "poincare/src/parsing/parser.h"
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#include <poincare/zoom.h>
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#include <ion/display.h>
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#include <ion/unicode/utf8_decoder.h>
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#include <algorithm>
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#include <assert.h>
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#include <cmath>
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#include <float.h>
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#include <string.h>
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using namespace Poincare;
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namespace Shared {
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Function::NameNotCompliantError Function::BaseNameCompliant(const char * baseName) {
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assert(baseName[0] != 0);
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UTF8Decoder decoder(baseName);
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CodePoint c = decoder.nextCodePoint();
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if (c.isDecimalDigit()) {
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return NameNotCompliantError::NameCannotStartWithNumber;
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}
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while (c != UCodePointNull) {
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// FIXME '_' should be accepted but not as first character
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// TODO Factor this piece of code with similar one in the Parser
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if (!(c.isDecimalDigit() || c.isLatinLetter()) || c == '_') {
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return NameNotCompliantError::CharacterNotAllowed;
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}
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c = decoder.nextCodePoint();
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}
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if (Parser::IsReservedName(baseName, strlen(baseName))) {
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return NameNotCompliantError::ReservedName;
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}
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return NameNotCompliantError::None;
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}
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bool Function::isActive() const {
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return recordData()->isActive();
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}
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KDColor Function::color() const {
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return recordData()->color();
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}
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void Function::setActive(bool active) {
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recordData()->setActive(active);
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}
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int Function::printValue(double cursorT, double cursorX, double cursorY, char * buffer, int bufferSize, int precision, Poincare::Context * context) {
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return PoincareHelpers::ConvertFloatToText<double>(cursorY, buffer, bufferSize, precision);
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}
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int Function::name(char * buffer, size_t bufferSize) {
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return SymbolAbstract::TruncateExtension(buffer, fullName(), bufferSize);
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}
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int Function::nameWithArgument(char * buffer, size_t bufferSize) {
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int funcNameSize = name(buffer, bufferSize);
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assert(funcNameSize > 0);
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size_t result = funcNameSize;
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assert(result <= bufferSize);
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buffer[result++] = '(';
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assert(result <= bufferSize);
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assert(UTF8Decoder::CharSizeOfCodePoint(symbol()) <= 2);
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result += UTF8Decoder::CodePointToChars(symbol(), buffer+result, bufferSize-result);
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assert(result <= bufferSize);
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result += strlcpy(buffer+result, ")", bufferSize-result);
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return result;
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}
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Function::RecordDataBuffer * Function::recordData() const {
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assert(!isNull());
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Ion::Storage::Record::Data d = value();
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return reinterpret_cast<RecordDataBuffer *>(const_cast<void *>(d.buffer));
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}
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void Function::protectedRangeForDisplay(float * xMin, float * xMax, float * yMin, float * yMax, Poincare::Context * context, bool boundByMagnitude) const {
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Zoom::ValueAtAbscissa evaluation = [](float x, Context * context, const void * auxiliary) {
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/* When evaluating sin(x)/x close to zero using the standard sine function,
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* one can detect small variations, while the cardinal sine is supposed to be
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* locally monotonous. To smooth our such variations, we round the result of
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* the evaluations. As we are not interested in precise results but only in
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* ordering, this approximation is sufficient. */
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constexpr float precision = 1e-5;
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return precision * std::round(static_cast<const Function *>(auxiliary)->evaluateXYAtParameter(x, context).x2() / precision);
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};
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Zoom::InterestingRangesForDisplay(evaluation, xMin, xMax, yMin, yMax, tMin(), tMax(), context, this);
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evaluation = [](float x, Context * context, const void * auxiliary) {
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return static_cast<const Function *>(auxiliary)->evaluateXYAtParameter(x, context).x2();
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};
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Zoom::RefinedYRangeForDisplay(evaluation, *xMin, *xMax, yMin, yMax, context, this, boundByMagnitude);
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}
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}
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