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An empty scene says how to start (add, draw, search, pies, import)

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Nexoniarz 2026-10-21 07:44:20 +02:00
commit e6b3ffeda9
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20
src/app.cpp
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@ -5555,10 +5555,30 @@ private:
// (the Print tab's: the printer's plate and overhangs)
// On top of the scene: outlines and wires, points, the gizmo, the selection shapes.
// An empty scene: how to start, in the middle of the view (gone once there's anything).
void emptyHints(ImDrawList* dl) {
if (!scene_.objects.empty() || capturing() || tab_ != Tab::Model) return;
const char* lines[] = {touch() ? "Nothing here yet: tap + to add a shape" : "Nothing here yet: Add (menu) for a shape, or draw one (D)",
touch() ? "Hold a finger on the view for more" : "F3 or Ctrl+Space: find any command by name",
touch() ? "" : "Space: tools round the mouse Shift+Space: views",
touch() ? "" : "File > Import: STL, OBJ, 3MF, glTF from elsewhere"};
const float lh = ImGui::GetTextLineHeightWithSpacing() * 1.25f;
float y = (viewMin_.y + viewMax_.y) * 0.5f - lh * 2, widest = 0;
int shown = 0;
for (const char* l : lines) widest = std::max(widest, ImGui::CalcTextSize(l).x), shown += *l != 0;
const float cx = (viewMin_.x + viewMax_.x) * 0.5f;
dl->AddRectFilled(ImVec2(cx - widest * 0.5f - 18, y - 12), ImVec2(cx + widest * 0.5f + 18, y + lh * float(shown) + 6), IM_COL32(28, 28, 32, 200), 8.0f);
for (int i = 0; i < 4; ++i, y += lh) {
if (!*lines[i]) continue;
const ImVec2 size = ImGui::CalcTextSize(lines[i]);
dl->AddText(ImVec2((viewMin_.x + viewMax_.x - size.x) * 0.5f, y), i == 0 ? IM_COL32(230, 230, 235, 200) : IM_COL32(200, 200, 205, 130), lines[i]);
}
}
void overlays() {
ImDrawList* dl = ImGui::GetBackgroundDrawList();
dl->PushClipRect(viewMin_, viewMax_);
const ImGuiIO& io = ImGui::GetIO();
emptyHints(dl);
// Every edge of a mesh (X-ray, wireframe), or just the edges the eye can see.
auto lines = [&](const Object& o, const Mesh& mesh, ImU32 col, float width, bool seenOnly) {
const glm::mat4 m = objectMatrix(o);