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feat: Add AABB/hit testing foundation (#138)

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C++ additions:
- get_global_bounds(): returns bounds in screen coordinates
- contains_point(x, y): hit test using global bounds

Python properties (on all UIDrawable types):
- bounds: (x, y, w, h) tuple in local coordinates
- global_bounds: (x, y, w, h) tuple in screen coordinates

These enable the mouse event system (#140, #141, #142) by providing
a way to determine which drawable is under the mouse cursor.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
John McCardle 2025-11-27 22:36:08 -05:00
commit 6d5a5e9e16
4 changed files with 236 additions and 0 deletions
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87
src/UIDrawable.cpp
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@ -733,6 +733,21 @@ sf::Vector2f UIDrawable::get_global_position() const {
return global_pos;
}
// #138 - Global bounds (bounds in screen coordinates)
sf::FloatRect UIDrawable::get_global_bounds() const {
sf::FloatRect local_bounds = get_bounds();
sf::Vector2f global_pos = get_global_position();
// Return bounds offset to global position
return sf::FloatRect(global_pos.x, global_pos.y, local_bounds.width, local_bounds.height);
}
// #138 - Hit testing
bool UIDrawable::contains_point(float x, float y) const {
sf::FloatRect global_bounds = get_global_bounds();
return global_bounds.contains(x, y);
}
// #116 - Dirty flag propagation up parent chain
void UIDrawable::markDirty() {
if (render_dirty) return; // Already dirty, no need to propagate
@ -978,3 +993,75 @@ PyObject* UIDrawable::get_global_pos(PyObject* self, void* closure) {
return result;
}
// #138 - Python API for bounds property
PyObject* UIDrawable::get_bounds_py(PyObject* self, void* closure) {
PyObjectsEnum objtype = static_cast<PyObjectsEnum>(reinterpret_cast<long>(closure));
UIDrawable* drawable = nullptr;
switch (objtype) {
case PyObjectsEnum::UIFRAME:
drawable = ((PyUIFrameObject*)self)->data.get();
break;
case PyObjectsEnum::UICAPTION:
drawable = ((PyUICaptionObject*)self)->data.get();
break;
case PyObjectsEnum::UISPRITE:
drawable = ((PyUISpriteObject*)self)->data.get();
break;
case PyObjectsEnum::UIGRID:
drawable = ((PyUIGridObject*)self)->data.get();
break;
case PyObjectsEnum::UILINE:
drawable = ((PyUILineObject*)self)->data.get();
break;
case PyObjectsEnum::UICIRCLE:
drawable = ((PyUICircleObject*)self)->data.get();
break;
case PyObjectsEnum::UIARC:
drawable = ((PyUIArcObject*)self)->data.get();
break;
default:
PyErr_SetString(PyExc_TypeError, "Invalid UIDrawable derived instance");
return NULL;
}
sf::FloatRect bounds = drawable->get_bounds();
return Py_BuildValue("(ffff)", bounds.left, bounds.top, bounds.width, bounds.height);
}
// #138 - Python API for global_bounds property
PyObject* UIDrawable::get_global_bounds_py(PyObject* self, void* closure) {
PyObjectsEnum objtype = static_cast<PyObjectsEnum>(reinterpret_cast<long>(closure));
UIDrawable* drawable = nullptr;
switch (objtype) {
case PyObjectsEnum::UIFRAME:
drawable = ((PyUIFrameObject*)self)->data.get();
break;
case PyObjectsEnum::UICAPTION:
drawable = ((PyUICaptionObject*)self)->data.get();
break;
case PyObjectsEnum::UISPRITE:
drawable = ((PyUISpriteObject*)self)->data.get();
break;
case PyObjectsEnum::UIGRID:
drawable = ((PyUIGridObject*)self)->data.get();
break;
case PyObjectsEnum::UILINE:
drawable = ((PyUILineObject*)self)->data.get();
break;
case PyObjectsEnum::UICIRCLE:
drawable = ((PyUICircleObject*)self)->data.get();
break;
case PyObjectsEnum::UIARC:
drawable = ((PyUIArcObject*)self)->data.get();
break;
default:
PyErr_SetString(PyExc_TypeError, "Invalid UIDrawable derived instance");
return NULL;
}
sf::FloatRect bounds = drawable->get_global_bounds();
return Py_BuildValue("(ffff)", bounds.left, bounds.top, bounds.width, bounds.height);
}