public static void PollEvents(GameWindow window, Camera camera, MouseState mouseState, KeyboardState keyboardState, FrameEventArgs e)
{
// update cursor position in NDC space
CursorPositionNDC = MouseToNDC(window, mouseState); // TODO: consider creating an extension method CursorPositionNDC() for MouseState
// perform a raycast and store the result for later use
RaycastResult = Ray.Cast(ref camera.ViewMatrix, ref camera.ProjectionMatrix);
// attach widgets to or detach from the selected objects
AttachWidgets(camera);
// scale all axes so that their size on screen remains fixed
TranslationalWidget.Scale(camera);
if (MainWindow.Mode == InteractionMode.Design && !ImGui.IsWindowHovered(
ImGuiHoveredFlags.AnyWindow |
ImGuiHoveredFlags.AllowWhenBlockedByPopup)) // TODO: perhaps use some other way of obtaining current mode?
{
// check whether any physical object is being selected
PollSelection(window, mouseState, keyboardState);
// poll widget for interaction
TranslationalWidget.Poll(camera, RaycastResult, mouseState, _lastState);
}
// poll the mouse for events
PollMouse(window, camera, mouseState);
// poll the keyboard for events
PollKeyboard(window, camera, keyboardState, e);
// poll the screen for events
PollScreen(window, keyboardState);
}
public static void AttachWidgets(Camera camera)
{
if (SelectedObjects.Count == 1)
{
var selected = SelectedObjects[0].UserObject as ISelectable;
if (selected != CurrentSelectedObject)
{
CurrentSelectedObject = selected;
// fire an event of selected object being changed
SelectedObjectChanged?.Invoke(selected, EventArgs.Empty);
}
// attach the widget
TranslationalWidget.Attach(CurrentSelectedObject as ITranslatable, camera);
}
else
{
if (SelectedObjects.Count == 0 || !(CurrentSelectedObject is Manipulator))
{
CurrentSelectedObject = null;
}
// detach the widget
TranslationalWidget.Detach();
}
}
public static void Dispose()
{
// dispose of the widgets
TranslationalWidget.Dispose();
}