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ImHex/plugins/builtin/source/content/tools/graphing_calc.cpp

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#include <hex/helpers/http_requests.hpp>
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#include <wolv/math_eval/math_evaluator.hpp>
#include <imgui.h>
#include <implot.h>
#include <hex/ui/imgui_imhex_extensions.h>
#include <fonts/codicons_font.h>
namespace hex::plugin::builtin {
void drawGraphingCalculator() {
static std::array<long double, 1000> x, y;
static std::string mathInput;
static ImPlotRect limits;
static double prevPos = 0;
static long double stepSize = 0.1;
if (ImPlot::BeginPlot("Function", ImVec2(-1, 0), ImPlotFlags_NoTitle | ImPlotFlags_NoMenus | ImPlotFlags_NoBoxSelect | ImPlotFlags_NoMouseText | ImPlotFlags_NoFrame)) {
ImPlot::SetupAxesLimits(-10, 10, -5, 5, ImPlotCond_Once);
limits = ImPlot::GetPlotLimits(ImAxis_X1, ImAxis_Y1);
ImPlot::PlotLine("f(x)", x.data(), y.data(), x.size());
ImPlot::EndPlot();
}
ImGui::PushItemWidth(-1);
ImGuiExt::InputTextIcon("##graphing_math_input", ICON_VS_SYMBOL_OPERATOR, mathInput, ImGuiInputTextFlags_EnterReturnsTrue | ImGuiInputTextFlags_AutoSelectAll);
ImGui::PopItemWidth();
if ((prevPos != limits.X.Min && (ImGui::IsMouseReleased(ImGuiMouseButton_Left) || ImGui::GetIO().MouseWheel != 0)) || (ImGui::IsItemFocused() && ImGui::IsKeyPressed(ImGuiKey_Enter))) {
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wolv::math_eval::MathEvaluator<long double> evaluator;
y = {};
u32 i = 0;
evaluator.setFunction("y", [&](auto args) -> std::optional<long double> {
i32 index = i + args[0];
if (index < 0 || u32(index) >= y.size())
return 0;
else
return y[index];
}, 1, 1);
evaluator.registerStandardVariables();
evaluator.registerStandardFunctions();
stepSize = (limits.X.Size()) / x.size();
for (i = 0; i < x.size(); i++) {
evaluator.setVariable("x", limits.X.Min + i * stepSize);
x[i] = limits.X.Min + i * stepSize;
y[i] = evaluator.evaluate(mathInput).value_or(0);
if (y[i] < limits.Y.Min)
limits.Y.Min = y[i];
if (y[i] > limits.Y.Max)
limits.X.Max = y[i];
}
limits.X.Max = limits.X.Min + x.size() * stepSize;
prevPos = limits.X.Min;
}
}
}