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Add world axis lines with brighter styling for origin grid lines #137

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Add world axis lines with brighter styling for origin grid lines #137

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c93f963
Initial plan
Copilot Jul 19, 2025
bf5336f
feat: add world axis lines with brighter styling for origin grid lines
Copilot Jul 19, 2025
19cc070
fix: simplify grid line styling to match ImPlot - unified color for a…
Copilot Jul 19, 2025
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14 changes: 8 additions & 6 deletions implot3d.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -618,8 +618,8 @@ void RenderPlotBorder(ImDrawList* draw_list, const ImPlot3DPlot& plot, const ImV

void RenderGrid(ImDrawList* draw_list, const ImPlot3DPlot& plot, const ImPlot3DPoint* corners, const bool* active_faces, const int plane_2d) {
ImVec4 col_grid = GetStyleColorVec4(ImPlot3DCol_AxisGrid);
ImU32 col_grid_minor = ImGui::GetColorU32(col_grid * ImVec4(1, 1, 1, 0.3f));
ImU32 col_grid_major = ImGui::GetColorU32(col_grid * ImVec4(1, 1, 1, 0.6f));
ImU32 col_grid_regular = ImGui::GetColorU32(col_grid * ImVec4(1, 1, 1, 0.6f)); // All regular grid lines
ImU32 col_grid_world = ImGui::GetColorU32(col_grid * ImVec4(1, 1, 1, 0.9f)); // World axis lines (through origin)
for (int face = 0; face < 3; face++) {
if (plane_2d != -1 && face != plane_2d)
continue;
Expand Down Expand Up @@ -660,8 +660,9 @@ void RenderGrid(ImDrawList* draw_list, const ImPlot3DPlot& plot, const ImPlot3DP
ImVec2 p_start_pix = PlotToPixels(p_start);
ImVec2 p_end_pix = PlotToPixels(p_end);

// Get color
ImU32 col_line = tick.Major ? col_grid_major : col_grid_minor;
// Get color - special case for world axis lines (through origin)
bool is_world_axis = ImAbs(tick.PlotPos) < 1e-8f; // Very close to zero
ImU32 col_line = is_world_axis ? col_grid_world : col_grid_regular;

// Draw the grid line
draw_list->AddLine(p_start_pix, p_end_pix, col_line);
Expand All @@ -686,8 +687,9 @@ void RenderGrid(ImDrawList* draw_list, const ImPlot3DPlot& plot, const ImPlot3DP
ImVec2 p_start_pix = PlotToPixels(p_start);
ImVec2 p_end_pix = PlotToPixels(p_end);

// Get color
ImU32 col_line = tick.Major ? col_grid_major : col_grid_minor;
// Get color - special case for world axis lines (through origin)
bool is_world_axis = ImAbs(tick.PlotPos) < 1e-8f; // Very close to zero
ImU32 col_line = is_world_axis ? col_grid_world : col_grid_regular;

// Draw the grid line
draw_list->AddLine(p_start_pix, p_end_pix, col_line);
Expand Down