ActorTouchController

Class

Source: ActorTouchController.h

Description

Handles touch-based dragging of game actors

This controller manages a pool of actors that can be dragged via touch input. It implements:

• Drag threshold (5 pixels) to ignore jitter
• Offset preservation (actor moves relative to initial touch position)
• Single drag (only one actor dragged at a time)
• Fixed pool (no dynamic memory allocation)

Usage:

ActorTouchController controller;
controller.registerActor(&myActor);
// In game loop:
TouchEvent events[16];
uint8_t count = dispatcher.getEvents(events, 16);
for (uint8_t i = 0; i < count; i++) {
    controller.handleTouch(events[i]);
}

Methods

void reset()

Description:

Clear registered actors and drag state (e.g. scene reset / arena recycle).

bool registerActor(pixelroot32::core::Actor* actor)

Description:

Register an actor to the drag pool

Parameters:

• actor: Pointer to the actor to register

Returns: true if registration succeeded, false if pool is full

Note: Does not check for duplicates - caller should ensure the actor is not already registered.

void setTouchHitSlop(int16_t expandPixels)

Description:

Expand hit-test rectangles by this many pixels on each side (0 = exact hitbox only). Useful when calibrated screen coords lag the visual sprite on resistive panels.

int16_t getTouchHitSlop() const

Description:

Current hit slop in pixels (per side).

bool unregisterActor(pixelroot32::core::Actor* actor)

Description:

Unregister an actor from the drag pool

Parameters:

• actor: Pointer to the actor to unregister

Returns: true if actor was found and removed, false if not found

void handleTouch(const TouchEvent& event)

Description:

Handle a touch event

Parameters:

• event: The touch event to process

Routes events based on type:

• TouchDown: Check for hit, begin drag if threshold exceeded
• DragMove: Update dragged actor position
• TouchUp: End drag

bool isDragging() const

Description:

Check if currently dragging an actor

Returns: true if a drag operation is in progress

pixelroot32::core::Actor* getDraggedActor() const

Description:

Get the currently dragged actor

Returns: Pointer to the dragged actor, nullptr if not dragging

pixelroot32::core::Actor* hitTest(int16_t x, int16_t y)

Description:

Perform hit test to find actor at touch position

Parameters:

• x: X coordinate
• y: Y coordinate

Returns: Pointer to hit actor, nullptr if none hit

bool pointInRect(int16_t px, int16_t py, const pixelroot32::core::Rect& rect, int16_t slop = 0)

Description:

Check if a point is inside a rectangle, optionally expanded by @a slop pixels per side.

void onTouchDown(const TouchEvent& event)

Description:

Handle touch down event

Parameters:

• event: The touch down event

void onTouchMove(const TouchEvent& event)

Description:

Handle drag move event

Parameters:

• event: The drag move event

void onTouchUp(const TouchEvent& event)

Description:

Handle touch up event

Parameters:

• event: The touch up event

void onDragStart(const TouchEvent& event)

Description:

Handle drag start (movement exceeded threshold after TouchDown). If TouchDown missed the actor but the finger is now on one, start dragging.