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Destroyed plot_var_example (markdown)

omar 2022-05-16 17:39:58 +02:00
parent 55e3511ff7
commit 134b33c974
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plot_var_example.md

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Helper to store values so they can be plotted over time.
Usage
```cpp
// Call once a frame with current value
ImGui::PlotVar("Speed", current_speed);
```
![capture](https://cloud.githubusercontent.com/assets/8225057/13555359/e73f840c-e3be-11e5-8362-2b390e496513.PNG)
.h
```cpp
// Plot value over time
// Pass FLT_MAX value to draw without adding a new value
void PlotVar(const char* label, float value, float scale_min = FLT_MAX, float scale_max = FLT_MAX, size_t buffer_size = 120);
// Call this periodically to discard old/unused data
void PlotVarFlushOldEntries();
```
.cpp
```cpp
#include <map>
struct PlotVarData
{
ImGuiID ID;
Vector<float> Data;
int DataInsertIdx;
int LastFrame;
PlotVarData() : ID(0), DataInsertIdx(0), LastFrame(-1) {}
};
typedef std::map<ImGuiID, PlotVarData> PlotVarsMap;
static PlotVarsMap g_PlotVarsMap;
// Plot value over time
// Call with 'value == FLT_MAX' to draw without adding new value to the buffer
void ImGui::PlotVar(const char* label, float value, float scale_min, float scale_max, size_t buffer_size)
{
ASSERT(label);
if (buffer_size == 0)
buffer_size = 120;
ImGui::PushID(label);
ImGuiID id = ImGui::GetID("");
// Lookup O(log N)
PlotVarData& pvd = g_PlotVarsMap[id];
// Setup
if (pvd.Data.capacity() != buffer_size)
{
pvd.Data.resize(buffer_size);
memset(&pvd.Data[0], 0, sizeof(float) * buffer_size);
pvd.DataInsertIdx = 0;
pvd.LastFrame = -1;
}
// Insert (avoid unnecessary modulo operator)
if (pvd.DataInsertIdx == buffer_size)
pvd.DataInsertIdx = 0;
int display_idx = pvd.DataInsertIdx;
if (value != FLT_MAX)
pvd.Data[pvd.DataInsertIdx++] = value;
// Draw
int current_frame = ImGui::GetFrameCount();
if (pvd.LastFrame != current_frame)
{
ImGui::PlotLines("##plot", &pvd.Data[0], buffer_size, pvd.DataInsertIdx, NULL, scale_min, scale_max, ImVec2(0, 40));
ImGui::SameLine();
ImGui::Text("%s\n%-3.4f", label, pvd.Data[display_idx]); // Display last value in buffer
pvd.LastFrame = current_frame;
}
ImGui::PopID();
}
void ImGui::PlotVarFlushOldEntries()
{
int current_frame = ImGui::GetFrameCount();
for (PlotVarsMap::iterator it = g_PlotVarsMap.begin(); it != g_PlotVarsMap.end(); )
{
PlotVarData& pvd = it->second;
if (pvd.LastFrame < current_frame - MAX(400,(int)pvd.Data.size()))
it = g_PlotVarsMap.erase(it);
else
++it;
}
}
```