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Plot: plot a flat line if scale_min==scale_max (#1621)

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This commit is contained in:
omar 2018-02-16 14:34:49 +01:00
parent ff5f56dd21
commit 1cbfe0700c
1 changed files with 4 additions and 3 deletions
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7
imgui.cpp
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@ -9287,11 +9287,12 @@ void ImGui::PlotEx(ImGuiPlotType plot_type, const char* label, float (*values_ge
}
const float t_step = 1.0f / (float)res_w;
const float inv_scale = (scale_min == scale_max) ? 0.0f : (1.0f / (scale_max - scale_min));
float v0 = values_getter(data, (0 + values_offset) % values_count);
float t0 = 0.0f;
ImVec2 tp0 = ImVec2( t0, 1.0f - ImSaturate((v0 - scale_min) / (scale_max - scale_min)) ); // Point in the normalized space of our target rectangle
float histogram_zero_line_t = (scale_min * scale_max < 0.0f) ? (-scale_min / (scale_max - scale_min)) : (scale_min < 0.0f ? 0.0f : 1.0f); // Where does the zero line stands
ImVec2 tp0 = ImVec2( t0, 1.0f - ImSaturate((v0 - scale_min) * inv_scale) ); // Point in the normalized space of our target rectangle
float histogram_zero_line_t = (scale_min * scale_max < 0.0f) ? (-scale_min * inv_scale) : (scale_min < 0.0f ? 0.0f : 1.0f); // Where does the zero line stands
const ImU32 col_base = GetColorU32((plot_type == ImGuiPlotType_Lines) ? ImGuiCol_PlotLines : ImGuiCol_PlotHistogram);
const ImU32 col_hovered = GetColorU32((plot_type == ImGuiPlotType_Lines) ? ImGuiCol_PlotLinesHovered : ImGuiCol_PlotHistogramHovered);
@ -9302,7 +9303,7 @@ void ImGui::PlotEx(ImGuiPlotType plot_type, const char* label, float (*values_ge
const int v1_idx = (int)(t0 * item_count + 0.5f);
IM_ASSERT(v1_idx >= 0 && v1_idx < values_count);
const float v1 = values_getter(data, (v1_idx + values_offset + 1) % values_count);
const ImVec2 tp1 = ImVec2( t1, 1.0f - ImSaturate((v1 - scale_min) / (scale_max - scale_min)) );
const ImVec2 tp1 = ImVec2( t1, 1.0f - ImSaturate((v1 - scale_min) * inv_scale) );
// NB: Draw calls are merged together by the DrawList system. Still, we should render our batch are lower level to save a bit of CPU.
ImVec2 pos0 = ImLerp(inner_bb.Min, inner_bb.Max, tp0);