TouchManager

Class

Source: TouchManager.h

Description

Touch event aggregation layer

This class is COMPLETELY INDEPENDENT of the touch adapter. It receives normalized TouchPoints and provides:

• Circular buffer of recent touch points
• Active touch count query
• Coordinate mapping integration point for InputManager

The pipeline is: [XPT2046/GT911 Adapter] → [TouchManager] → [UI System]

Properties

Name	Type	Description
constexpr	static	Fixed-size circular buffer

Methods

bool init()

Description:

Initialize touch system

Returns: true if initialization successful

void update(unsigned long dt)

Description:

Update touch state - call this every frame

Parameters:

• dt: Delta time in milliseconds

uint8_t getTouchPoints(TouchPoint* points) const

Description:

Get all active touch points

Parameters:

• points: Output buffer

Returns: Number of active touch points

uint8_t getActiveCount() const

Description:

Get number of active touch points

Returns: Count of currently pressed touches

bool isTouchActive() const

Description:

Check if any touch is active

Returns: true if any touch is pressed

const TouchPoint& getTouchPoint(uint8_t index) const

Description:

Get touch point at specific index

Parameters:

• index: Index (0 to getActiveCount() - 1)

Returns: TouchPoint reference

bool isTouchedInArea(int16_t x, int16_t y, int16_t radius) const

Description:

Check if specific area is touched

Parameters:

• x: X coordinate
• y: Y coordinate
• radius: Touch hit radius

Returns: true if touch detected in area

void setCalibration(const TouchCalibration& calib)

Description:

Set calibration parameters

Parameters:

• calib: Calibration data

bool isConnected() const

Description:

Check if touch controller is connected

Returns: true if responding

void addTouchPoint(const TouchPoint& point)

Description:

Add touch point to circular buffer

Parameters:

• point: Touch point to add

void clearBuffer()

Description:

Clear all touch points

static int16_t distance(int16_t x1, int16_t y1, int16_t x2, int16_t y2)

Description:

Calculate distance between two points

Returns: Distance in pixels