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Demo: plot code doesn't use ImVector to avoid heap allocation + comment (#538)

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ocornut 2016-02-29 12:53:05 +01:00
parent 1881cbe860
commit ba80a457b9
1 changed files with 5 additions and 3 deletions
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8
imgui_demo.cpp
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@ -713,7 +713,9 @@ void ImGui::ShowTestWindow(bool* p_opened)
static float arr[] = { 0.6f, 0.1f, 1.0f, 0.5f, 0.92f, 0.1f, 0.2f }; static float arr[] = { 0.6f, 0.1f, 1.0f, 0.5f, 0.92f, 0.1f, 0.2f };
ImGui::PlotLines("Frame Times", arr, IM_ARRAYSIZE(arr)); ImGui::PlotLines("Frame Times", arr, IM_ARRAYSIZE(arr));
static ImVector<float> values; if (values.empty()) { values.resize(90); memset(values.Data, 0, values.Size*sizeof(float)); } // Create a dummy array of contiguous float values to plot
// Tip: If your float aren't contiguous but part of a structure, you can pass a pointer to your first float and the sizeof() of your structure in the Stride parameter.
static float values[90] = { 0 };
static int values_offset = 0; static int values_offset = 0;
if (animate) if (animate)
{ {
@ -722,11 +724,11 @@ void ImGui::ShowTestWindow(bool* p_opened)
{ {
static float phase = 0.0f; static float phase = 0.0f;
values[values_offset] = cosf(phase); values[values_offset] = cosf(phase);
values_offset = (values_offset+1)%values.Size; values_offset = (values_offset+1) % IM_ARRAYSIZE(values);
phase += 0.10f*values_offset; phase += 0.10f*values_offset;
} }
} }
ImGui::PlotLines("Lines", values.Data, values.Size, values_offset, "avg 0.0", -1.0f, 1.0f, ImVec2(0,80)); ImGui::PlotLines("Lines", values, IM_ARRAYSIZE(values), values_offset, "avg 0.0", -1.0f, 1.0f, ImVec2(0,80));
ImGui::PlotHistogram("Histogram", arr, IM_ARRAYSIZE(arr), 0, NULL, 0.0f, 1.0f, ImVec2(0,80)); ImGui::PlotHistogram("Histogram", arr, IM_ARRAYSIZE(arr), 0, NULL, 0.0f, 1.0f, ImVec2(0,80));
// Use functions to generate output // Use functions to generate output