egutierrez
0bdf35a461
Funciones C++/ImGui para dashboards (grid, panel, docking, sidebar, tabs), visualizaciones (candlestick, gauge, histogram, pie, sparkline, heatmap, scatter, line, bar, surface3d, kpi, table), grafos (force layout, renderer, viewport, spatial hash, types) y utilidades (time series buffer, tracy zones, memory/fps overlay, plot theme). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
95 lines
3.5 KiB
C++
95 lines
3.5 KiB
C++
#include "viz/gauge.h"
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#include "imgui.h"
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#include <cmath>
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#include <cstdio>
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#ifndef M_PI
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#define M_PI 3.14159265358979323846f
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#endif
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void gauge(const char* label, float value, float min_val, float max_val, float radius) {
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ImDrawList* draw_list = ImGui::GetWindowDrawList();
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ImVec2 pos = ImGui::GetCursorScreenPos();
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// Reserve space: diameter + label line
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float diameter = radius * 2.0f;
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ImGui::Dummy(ImVec2(diameter, diameter + ImGui::GetTextLineHeightWithSpacing()));
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ImVec2 center = ImVec2(pos.x + radius, pos.y + radius);
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// Arc spans 240 degrees: from 150deg to 390deg (i.e. 150 to 30 going clockwise)
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// In screen space Y is down, so angles go clockwise.
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// Start angle: 150 degrees = bottom-left, End angle: 390 = 30 degrees = bottom-right
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const float angle_start = (150.0f * (float)M_PI) / 180.0f;
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const float angle_end = (390.0f * (float)M_PI) / 180.0f;
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const int num_segments = 64;
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// Background arc (dark gray)
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ImU32 bg_color = IM_COL32(60, 60, 60, 220);
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for (int i = 0; i < num_segments; i++) {
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float a0 = angle_start + (angle_end - angle_start) * ((float)i / num_segments);
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float a1 = angle_start + (angle_end - angle_start) * ((float)(i + 1) / num_segments);
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draw_list->AddLine(
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ImVec2(center.x + cosf(a0) * radius, center.y + sinf(a0) * radius),
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ImVec2(center.x + cosf(a1) * radius, center.y + sinf(a1) * radius),
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bg_color, 6.0f);
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}
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// Normalize value to [0, 1]
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float t = 0.0f;
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if (max_val > min_val) {
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t = (value - min_val) / (max_val - min_val);
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if (t < 0.0f) t = 0.0f;
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if (t > 1.0f) t = 1.0f;
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}
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// Color: green (t=0) -> yellow (t=0.5) -> red (t=1)
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float r, g, b;
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if (t < 0.5f) {
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float s = t * 2.0f;
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r = (unsigned char)(s * 255);
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g = 200;
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b = 0;
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} else {
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float s = (t - 0.5f) * 2.0f;
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r = 220;
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g = (unsigned char)((1.0f - s) * 200);
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b = 0;
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}
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ImU32 value_color = IM_COL32((int)r, (int)g, (int)b, 255);
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// Value arc
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float angle_value = angle_start + (angle_end - angle_start) * t;
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int value_segments = (int)(num_segments * t);
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for (int i = 0; i < value_segments; i++) {
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float a0 = angle_start + (angle_end - angle_start) * ((float)i / num_segments);
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float a1 = angle_start + (angle_end - angle_start) * ((float)(i + 1) / num_segments);
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draw_list->AddLine(
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ImVec2(center.x + cosf(a0) * radius, center.y + sinf(a0) * radius),
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ImVec2(center.x + cosf(a1) * radius, center.y + sinf(a1) * radius),
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value_color, 6.0f);
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}
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// Needle: line from center to arc at current angle
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float needle_len = radius * 0.75f;
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ImVec2 needle_tip = ImVec2(
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center.x + cosf(angle_value) * needle_len,
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center.y + sinf(angle_value) * needle_len);
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draw_list->AddLine(center, needle_tip, IM_COL32(255, 255, 255, 240), 2.0f);
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draw_list->AddCircleFilled(center, 4.0f, IM_COL32(255, 255, 255, 200));
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// Value text centered
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char val_buf[32];
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snprintf(val_buf, sizeof(val_buf), "%.1f", value);
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ImVec2 val_size = ImGui::CalcTextSize(val_buf);
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draw_list->AddText(
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ImVec2(center.x - val_size.x * 0.5f, center.y + radius * 0.35f),
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IM_COL32(230, 230, 230, 255), val_buf);
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// Label below value
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ImVec2 label_size = ImGui::CalcTextSize(label);
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draw_list->AddText(
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ImVec2(center.x - label_size.x * 0.5f, center.y + radius * 0.35f + val_size.y + 2.0f),
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IM_COL32(180, 180, 180, 200), label);
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}
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