Add warning on to large and to small font which are not used in emboss text input

src/slic3r/GUI/Gizmos/GLGizmoEmboss.cpp

@@ -776,21 +776,44 @@ void GLGizmoEmboss::draw_text_input()
     if (exist_font) ImGui::PopFont();
 
     // show warning about incorrectness view of font
-    // TODO: add char gap and line gap
     std::string warning;
+    std::string tool_tip;
     const FontProp& prop = m_font_manager.get_font_prop();
     if (!exist_font) {
         warning = _u8L("Can't write text by selected font.");
+        tool_tip = _u8L("Try to choose another font.");
     } else {
         std::string who;
-        if (prop.skew.has_value()) who = _u8L("Italic");
+        auto append_warning = [&who, &tool_tip](std::string& w, std::string& t) {
+            if (!w.empty()) {
+                if (!who.empty()) who += " & ";
+                who += w;
+            }
+            if (!t.empty()) {
+                if (!tool_tip.empty()) tool_tip += "\n";
+                tool_tip += t;            
+            }
+        };
+        if (prop.skew.has_value()) {
+            append_warning(_u8L("Skew"), 
+                _u8L("Unsupported visualization of font skew for text input."));
+        }
         if (prop.boldness.has_value()) {
-            if (!who.empty()) who += " & ";
+            append_warning(_u8L("Boldness"),
-            who += _u8L("Boldness");
+                _u8L("Unsupported visualization of font boldness for text input."));
         }
         if (prop.line_gap.has_value()) {
-            if (!who.empty()) who += " & ";
+            append_warning(_u8L("Line gap"),
-            who += _u8L("Line gap");
+                _u8L("Unsupported visualization of gap between lines inside text input."));
+        }
+        float imgui_size = FontManager::get_imgui_font_size(prop, *m_font_manager.get_font_file());
+        if (imgui_size > FontManager::max_imgui_font_size) {            
+            append_warning(_u8L("Tall"),
+                _u8L("Diminished font height inside text input."));
+        }
+        if (imgui_size < FontManager::min_imgui_font_size) {            
+            append_warning(_u8L("Tiny"),
+                _u8L("Enlarged font height inside text input."));
         }
         if (!who.empty()) { 
             warning = GUI::format(_u8L("%1% is NOT shown."), who);
@@ -805,6 +828,8 @@ void GLGizmoEmboss::draw_text_input()
         ImGui::SetCursorPos(ImVec2(width - size.x + padding.x,
                                    cursor.y - size.y - padding.y));
         m_imgui->text_colored(ImGuiWrapper::COL_ORANGE_LIGHT, warning);
+        if (ImGui::IsItemHovered() && !tool_tip.empty())
+            ImGui::SetTooltip("%s", tool_tip.c_str());
         ImGui::SetCursorPos(cursor);
     }
 
@@ -1616,7 +1641,7 @@ void GLGizmoEmboss::draw_advanced()
     auto def_distance = m_stored_font_item.has_value() ?
         &m_stored_font_item->prop.distance : nullptr;
     if (rev_slider(tr.surface_distance, distance, def_distance, _u8L("Undo translation"), 
-        min_distance, max_distance, "%.2f mm", _L("Distance from model surface")) &&
+        min_distance, max_distance, "%.2f mm", _L("Distance center of text from model surface")) &&
         m_volume != nullptr && m_volume->text_configuration.has_value()){
         m_volume->text_configuration->font_item.prop.distance = font_prop.distance;        
         float act_distance = font_prop.distance.has_value() ? *font_prop.distance : .0f;

src/slic3r/Utils/FontManager.cpp

@@ -541,6 +541,19 @@ void FontManager::free_imgui_fonts()
     m_imgui_font_atlas.Clear();
 }
 
+float FontManager::min_imgui_font_size = 18.f;
+float FontManager::max_imgui_font_size = 60.f;
+float FontManager::get_imgui_font_size(const FontProp         &prop,
+                                       const Emboss::FontFile &file)
+{
+    // coeficient for convert line height to font size
+    float c1 = (file.ascent - file.descent + file.linegap) / (float) file.unit_per_em;
+
+    // The point size is defined as 1/72 of the Anglo-Saxon inch (25.4 mm):
+    // It is approximately 0.0139 inch or 352.8 um.
+    return c1 * std::abs(prop.size_in_mm) / 0.3528f;
+}
+
 ImFont * FontManager::load_imgui_font(size_t index, const std::string &text)
 {
     free_imgui_fonts(); // TODO: remove it after correct initialization
@@ -563,18 +576,11 @@ ImFont * FontManager::load_imgui_font(size_t index, const std::string &text)
                                 ImFontAtlasFlags_NoPowerOfTwoHeight;
 
     const FontProp &font_prop = item.font_item.prop;
-
+    float font_size = get_imgui_font_size(font_prop, font_file);
-    // coeficient for convert line height to font size
+    if (font_size < min_imgui_font_size)
-    float c1 = (font_file.ascent - font_file.descent + font_file.linegap) / (float) font_file.unit_per_em;
+        font_size = min_imgui_font_size;
-
+    if (font_size > max_imgui_font_size)
-    // The point size is defined as 1/72 of the Anglo-Saxon inch (25.4 mm): 
+        font_size = max_imgui_font_size;
-    // it is approximately 0.0139 inch or 352.8 um.
-    // But it is too small, so I decide use point size as mm for emboss
-    float font_size = c1 * std::abs(font_prop.size_in_mm) / 0.3528f;
-    if (font_size < m_cfg.min_imgui_font_size)
-        font_size = m_cfg.min_imgui_font_size;
-    if (font_size > m_cfg.max_imgui_font_size)
-        font_size = m_cfg.max_imgui_font_size;
 
     ImFontConfig font_config;
     // TODO: start using merge mode

src/slic3r/Utils/FontManager.hpp

@@ -154,6 +154,11 @@ public:
     // check if exist selected font style in manager
     bool is_activ_font();
 
+    // Limits for imgui loaded font size
+    // Value out of limits is crop
+    static float min_imgui_font_size;
+    static float max_imgui_font_size;
+    static float get_imgui_font_size(const FontProp& prop, const Emboss::FontFile& file);
 private:
     ImFontAtlas m_imgui_font_atlas;
 
@@ -182,14 +187,6 @@ private:
     bool check_imgui_font_range(ImFont *font, const std::string &text);
     void free_imgui_fonts();
 
-    struct Configuration
-    {
-        // limits for imgui loaded font
-        // Value out of limits is crop
-        float min_imgui_font_size = 18.f;
-        float max_imgui_font_size = 60.f;
-    } m_cfg;
-
     bool set_up_font_file(size_t item_index);
 
     void make_unique_name(std::string &name);