Function RenderGrid

implot3d.cpp:809–886

}

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));
    for (int face = 0; face < 3; face++) {
        if (plane_2d != -1 && face != plane_2d)
            continue;
        int face_idx = face + 3 * active_faces[face];
        const ImPlot3DAxis& axis_u = plot.Axes[(face + 1) % 3];
        const ImPlot3DAxis& axis_v = plot.Axes[(face + 2) % 3];

        // Get the two axes (u and v) that define the face plane
        int idx0 = faces[face_idx][0];
        int idx1 = faces[face_idx][1];
        int idx3 = faces[face_idx][3];

        // Corners of the face in plot space
        ImPlot3DPoint p0 = corners[idx0];
        ImPlot3DPoint p1 = corners[idx1];
        ImPlot3DPoint p3 = corners[idx3];

        // Vectors along the edges
        ImPlot3DPoint u_vec = p1 - p0;
        ImPlot3DPoint v_vec = p3 - p0;

        // Render grid lines along u axis (axis_u)
        if (!ImPlot3D::ImHasFlag(axis_u.Flags, ImPlot3DAxisFlags_NoGridLines))
            for (int t = 0; t < axis_u.Ticker.TickCount(); ++t) {
                const ImPlot3DTick& tick = axis_u.Ticker.Ticks[t];

                // Compute position along u
                double t_u = (tick.PlotPos - axis_u.Range.Min) / (axis_u.Range.Max - axis_u.Range.Min);

                // Skip ticks that are out of range
                if (t_u < 0.0 || t_u > 1.0)
                    continue;

                ImPlot3DPoint p_start = p0 + u_vec * t_u;
                ImPlot3DPoint p_end = p3 + u_vec * t_u;

                // Convert to pixel coordinates
                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;

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

        // Render grid lines along v axis (axis_v)
        if (!ImPlot3D::ImHasFlag(axis_v.Flags, ImPlot3DAxisFlags_NoGridLines))
            for (int t = 0; t < axis_v.Ticker.TickCount(); ++t) {
                const ImPlot3DTick& tick = axis_v.Ticker.Ticks[t];

                // Compute position along v
                double t_v = (tick.PlotPos - axis_v.Range.Min) / (axis_v.Range.Max - axis_v.Range.Min);