Method PlotEx

KBotExt/imgui/imgui_widgets.cpp:6721–6834

//-------------------------------------------------------------------------

int ImGui::PlotEx(ImGuiPlotType plot_type, const char* label, float (*values_getter)(void* data, int idx), void* data, int values_count, int values_offset, const char* overlay_text, float scale_min, float scale_max, const ImVec2& size_arg)
{
	ImGuiContext& g = *GImGui;
	ImGuiWindow* window = GetCurrentWindow();
	if (window->SkipItems)
		return -1;

	const ImGuiStyle& style = g.Style;
	const ImGuiID id = window->GetID(label);

	const ImVec2 label_size = CalcTextSize(label, NULL, true);
	const ImVec2 frame_size = CalcItemSize(size_arg, CalcItemWidth(), label_size.y + style.FramePadding.y * 2.0f);

	const ImRect frame_bb(window->DC.CursorPos, window->DC.CursorPos + frame_size);
	const ImRect inner_bb(frame_bb.Min + style.FramePadding, frame_bb.Max - style.FramePadding);
	const ImRect total_bb(frame_bb.Min, frame_bb.Max + ImVec2(label_size.x > 0.0f ? style.ItemInnerSpacing.x + label_size.x : 0.0f, 0));
	ItemSize(total_bb, style.FramePadding.y);
	if (!ItemAdd(total_bb, 0, &frame_bb))
		return -1;
	const bool hovered = ItemHoverable(frame_bb, id, g.LastItemData.InFlags);

	// Determine scale from values if not specified
	if (scale_min == FLT_MAX || scale_max == FLT_MAX)
	{
		float v_min = FLT_MAX;
		float v_max = -FLT_MAX;
		for (int i = 0; i < values_count; i++)
		{
			const float v = values_getter(data, i);
			if (v != v) // Ignore NaN values
				continue;
			v_min = ImMin(v_min, v);
			v_max = ImMax(v_max, v);
		}
		if (scale_min == FLT_MAX)
			scale_min = v_min;
		if (scale_max == FLT_MAX)
			scale_max = v_max;
	}

	RenderFrame(frame_bb.Min, frame_bb.Max, GetColorU32(ImGuiCol_FrameBg), true, style.FrameRounding);

	const int values_count_min = (plot_type == ImGuiPlotType_Lines) ? 2 : 1;
	int idx_hovered = -1;
	if (values_count >= values_count_min)
	{
		int res_w = ImMin((int)frame_size.x, values_count) + ((plot_type == ImGuiPlotType_Lines) ? -1 : 0);
		int item_count = values_count + ((plot_type == ImGuiPlotType_Lines) ? -1 : 0);

		// Tooltip on hover
		if (hovered && inner_bb.Contains(g.IO.MousePos))
		{
			const float t = ImClamp((g.IO.MousePos.x - inner_bb.Min.x) / (inner_bb.Max.x - inner_bb.Min.x), 0.0f, 0.9999f);
			const int v_idx = (int)(t * item_count);
			IM_ASSERT(v_idx >= 0 && v_idx < values_count);

			const float v0 = values_getter(data, (v_idx + values_offset) % values_count);
			const float v1 = values_getter(data, (v_idx + 1 + values_offset) % values_count);