egutierrez
3e0d3d612a
- toast.cpp: TI_BELL en lugar de \xf0\x9f\x94\x94 (fuera del rango cargado por icon_font, renderizaba como ?) - candlestick.cpp: SetupAxes/SetupAxisScale/SetupAxisLimits movidos dentro de BeginPlot/EndPlot — antes el plot desaparecia al entrar - pie_chart.cpp: SetupLegend(East, Outside, NoButtons), eliminado NoLegend - kpi_card.cpp: layout 2 cols con sparkline a la derecha centrado verticalmente
101 lines
3.7 KiB
C++
101 lines
3.7 KiB
C++
#include "viz/pie_chart.h"
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#include "viz/plot_static.h"
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#include "imgui.h"
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#include "implot.h"
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#include <cmath>
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namespace {
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// Localiza que slice del pie esta bajo el cursor.
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// Devuelve -1 si el cursor esta fuera del radio del pie.
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//
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// ImPlot dibuja slices en sentido ANTIHORARIO (matematico) desde angle0=90
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// grados (arriba). atan2(dy, dx) en ejes Y-up devuelve radianes CCW desde +x,
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// asi que en coords de datos: +x=0, +y=90 (arriba), -x=180, -y=-90 (abajo).
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// El offset desde "arriba" en sentido CCW es angle_deg - 90, normalizado.
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template <typename T>
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int slice_at(const T* values, int count, double total, double mouse_x,
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double mouse_y, double cx, double cy, double radius) {
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double dx = mouse_x - cx;
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double dy = mouse_y - cy;
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double r = std::sqrt(dx * dx + dy * dy);
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if (r > radius) return -1;
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constexpr double kPI = 3.14159265358979323846;
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double angle_deg = std::atan2(dy, dx) * 180.0 / kPI;
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double offset = angle_deg - 90.0; // desde arriba, sentido CCW
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while (offset < 0.0) offset += 360.0;
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while (offset >= 360.0) offset -= 360.0;
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double acc = 0.0;
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for (int i = 0; i < count; i++) {
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double sweep = (static_cast<double>(values[i]) / total) * 360.0;
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if (offset >= acc && offset < acc + sweep) return i;
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acc += sweep;
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}
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return count - 1;
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}
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template <typename T>
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void draw_pie(const char* title, const char* const* labels, const T* values,
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int count, double radius, float height) {
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if (count <= 0) return;
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double total = 0.0;
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for (int i = 0; i < count; i++) total += static_cast<double>(values[i]);
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if (total <= 0.0) return;
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double outer;
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if (radius < 0.0) outer = -radius;
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else outer = (radius > 0.0) ? radius : 0.4;
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const ImVec2 plot_size(-1.0f, height > 0.0f ? height : 200.0f);
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// Legend SIEMPRE visible para que se distingan las slices por color (los
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// pies suelen tener muchas categorias).
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const ImPlotFlags plot_flags = plot_static::kPlotFlags
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| ImPlotFlags_Equal;
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if (ImPlot::BeginPlot(title, plot_size, plot_flags)) {
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ImPlot::SetupAxes(nullptr, nullptr,
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plot_static::kAxisFlagsHidden,
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plot_static::kAxisFlagsHidden);
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ImPlot::SetupAxisLimits(ImAxis_X1, 0.0, 1.0, ImPlotCond_Always);
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ImPlot::SetupAxisLimits(ImAxis_Y1, 0.0, 1.0, ImPlotCond_Always);
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ImPlot::SetupLegend(ImPlotLocation_East,
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ImPlotLegendFlags_Outside | ImPlotLegendFlags_NoButtons);
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ImPlot::PlotPieChart(labels, values, count, 0.5, 0.5, outer, "%.0f", 90.0);
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if (ImPlot::IsPlotHovered()) {
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ImPlotPoint mp = ImPlot::GetPlotMousePos();
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int idx = slice_at<T>(values, count, total, mp.x, mp.y,
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0.5, 0.5, outer);
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if (idx >= 0) {
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double v = static_cast<double>(values[idx]);
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double pct = 100.0 * v / total;
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ImGui::BeginTooltip();
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ImGui::TextUnformatted(labels[idx]);
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ImGui::Separator();
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ImGui::Text("%.0f (%.1f%%)", v, pct);
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ImGui::EndTooltip();
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}
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}
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ImPlot::EndPlot();
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}
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}
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} // namespace
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void pie_chart(const char* title, const char* const* labels, const float* values,
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int count, float radius, float height) {
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draw_pie<float>(title, labels, values, count, static_cast<double>(radius), height);
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}
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void pie_chart(const char* title, const char* const* labels, const double* values,
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int count, double radius, float height) {
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draw_pie<double>(title, labels, values, count, radius, height);
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}
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