567 lines
22 KiB
C
567 lines
22 KiB
C
/**********************************************************************************************
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*
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* rgestures - Gestures system, gestures processing based on input events (touch/mouse)
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*
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* NOTE: Memory footprint of this library is aproximately 128 bytes (global variables)
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*
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* CONFIGURATION:
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*
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* #define GESTURES_IMPLEMENTATION
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* Generates the implementation of the library into the included file.
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* If not defined, the library is in header only mode and can be included in other headers
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* or source files without problems. But only ONE file should hold the implementation.
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*
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* #define GESTURES_STANDALONE
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* If defined, the library can be used as standalone to process gesture events with
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* no external dependencies.
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*
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* CONTRIBUTORS:
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* Marc Palau: Initial implementation (2014)
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* Albert Martos: Complete redesign and testing (2015)
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* Ian Eito: Complete redesign and testing (2015)
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* Ramon Santamaria: Supervision, review, update and maintenance
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*
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*
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* LICENSE: zlib/libpng
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*
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* Copyright (c) 2014-2022 Ramon Santamaria (@raysan5)
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*
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* This software is provided "as-is", without any express or implied warranty. In no event
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* will the authors be held liable for any damages arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose, including commercial
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* applications, and to alter it and redistribute it freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not claim that you
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* wrote the original software. If you use this software in a product, an acknowledgment
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* in the product documentation would be appreciated but is not required.
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*
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* 2. Altered source versions must be plainly marked as such, and must not be misrepresented
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* as being the original software.
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*
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* 3. This notice may not be removed or altered from any source distribution.
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*
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**********************************************************************************************/
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#ifndef RGESTURES_H
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#define RGESTURES_H
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#ifndef PI
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#define PI 3.14159265358979323846
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#endif
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//----------------------------------------------------------------------------------
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// Defines and Macros
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//----------------------------------------------------------------------------------
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#ifndef MAX_TOUCH_POINTS
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#define MAX_TOUCH_POINTS 8 // Maximum number of touch points supported
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#endif
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//----------------------------------------------------------------------------------
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// Types and Structures Definition
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// NOTE: Below types are required for GESTURES_STANDALONE usage
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//----------------------------------------------------------------------------------
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// Boolean type
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#if defined(__STDC__) && __STDC_VERSION__ >= 199901L
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#include <stdbool.h>
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#elif !defined(__cplusplus) && !defined(bool) && !defined(RL_BOOL_TYPE)
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typedef enum bool { false, true } bool;
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#endif
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#if !defined(RL_VECTOR2_TYPE)
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// Vector2 type
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typedef struct Vector2 {
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float x;
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float y;
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} Vector2;
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#endif
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#if defined(GESTURES_STANDALONE)
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// Gestures type
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// NOTE: It could be used as flags to enable only some gestures
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typedef enum {
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GESTURE_NONE = 0,
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GESTURE_TAP = 1,
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GESTURE_DOUBLETAP = 2,
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GESTURE_HOLD = 4,
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GESTURE_DRAG = 8,
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GESTURE_SWIPE_RIGHT = 16,
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GESTURE_SWIPE_LEFT = 32,
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GESTURE_SWIPE_UP = 64,
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GESTURE_SWIPE_DOWN = 128,
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GESTURE_PINCH_IN = 256,
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GESTURE_PINCH_OUT = 512
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} Gesture;
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#endif
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typedef enum {
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TOUCH_ACTION_UP = 0,
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TOUCH_ACTION_DOWN,
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TOUCH_ACTION_MOVE,
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TOUCH_ACTION_CANCEL
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} TouchAction;
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// Gesture event
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typedef struct {
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int touchAction;
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int pointCount;
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int pointId[MAX_TOUCH_POINTS];
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Vector2 position[MAX_TOUCH_POINTS];
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} GestureEvent;
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//----------------------------------------------------------------------------------
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// Global Variables Definition
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//----------------------------------------------------------------------------------
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//...
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//----------------------------------------------------------------------------------
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// Module Functions Declaration
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//----------------------------------------------------------------------------------
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#ifdef __cplusplus
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extern "C" { // Prevents name mangling of functions
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#endif
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void ProcessGestureEvent(GestureEvent event); // Process gesture event and translate it into gestures
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void UpdateGestures(void); // Update gestures detected (must be called every frame)
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#if defined(GESTURES_STANDALONE)
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void SetGesturesEnabled(unsigned int flags); // Enable a set of gestures using flags
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bool IsGestureDetected(int gesture); // Check if a gesture have been detected
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int GetGestureDetected(void); // Get latest detected gesture
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float GetGestureHoldDuration(void); // Get gesture hold time in milliseconds
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Vector2 GetGestureDragVector(void); // Get gesture drag vector
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float GetGestureDragAngle(void); // Get gesture drag angle
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Vector2 GetGesturePinchVector(void); // Get gesture pinch delta
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float GetGesturePinchAngle(void); // Get gesture pinch angle
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif // GESTURES_H
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/***********************************************************************************
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*
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* GESTURES IMPLEMENTATION
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*
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************************************************************************************/
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#if defined(GESTURES_IMPLEMENTATION)
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#if defined(_WIN32)
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#if defined(__cplusplus)
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extern "C" { // Prevents name mangling of functions
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#endif
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// Functions required to query time on Windows
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int __stdcall QueryPerformanceCounter(unsigned long long int *lpPerformanceCount);
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int __stdcall QueryPerformanceFrequency(unsigned long long int *lpFrequency);
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#if defined(__cplusplus)
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}
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#endif
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#elif defined(__linux__)
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#if _POSIX_C_SOURCE < 199309L
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#undef _POSIX_C_SOURCE
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#define _POSIX_C_SOURCE 199309L // Required for CLOCK_MONOTONIC if compiled with c99 without gnu ext.
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#endif
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#include <sys/time.h> // Required for: timespec
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#include <time.h> // Required for: clock_gettime()
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#include <math.h> // Required for: sqrtf(), atan2f()
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#endif
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#if defined(__APPLE__) // macOS also defines __MACH__
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#include <mach/clock.h> // Required for: clock_get_time()
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#include <mach/mach.h> // Required for: mach_timespec_t
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#endif
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//----------------------------------------------------------------------------------
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// Defines and Macros
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//----------------------------------------------------------------------------------
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#define FORCE_TO_SWIPE 0.0005f // Swipe force, measured in normalized screen units/time
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#define MINIMUM_DRAG 0.015f // Drag minimum force, measured in normalized screen units (0.0f to 1.0f)
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#define MINIMUM_PINCH 0.005f // Pinch minimum force, measured in normalized screen units (0.0f to 1.0f)
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#define TAP_TIMEOUT 300 // Tap minimum time, measured in milliseconds
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#define PINCH_TIMEOUT 300 // Pinch minimum time, measured in milliseconds
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#define DOUBLETAP_RANGE 0.03f // DoubleTap range, measured in normalized screen units (0.0f to 1.0f)
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//----------------------------------------------------------------------------------
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// Types and Structures Definition
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//----------------------------------------------------------------------------------
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// Gestures module state context [136 bytes]
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typedef struct {
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unsigned int current; // Current detected gesture
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unsigned int enabledFlags; // Enabled gestures flags
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struct {
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int firstId; // Touch id for first touch point
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int pointCount; // Touch points counter
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double eventTime; // Time stamp when an event happened
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Vector2 upPosition; // Touch up position
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Vector2 downPositionA; // First touch down position
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Vector2 downPositionB; // Second touch down position
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Vector2 downDragPosition; // Touch drag position
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Vector2 moveDownPositionA; // First touch down position on move
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Vector2 moveDownPositionB; // Second touch down position on move
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int tapCounter; // TAP counter (one tap implies TOUCH_ACTION_DOWN and TOUCH_ACTION_UP actions)
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} Touch;
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struct {
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bool resetRequired; // HOLD reset to get first touch point again
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double timeDuration; // HOLD duration in milliseconds
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} Hold;
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struct {
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Vector2 vector; // DRAG vector (between initial and current position)
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float angle; // DRAG angle (relative to x-axis)
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float distance; // DRAG distance (from initial touch point to final) (normalized [0..1])
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float intensity; // DRAG intensity, how far why did the DRAG (pixels per frame)
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} Drag;
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struct {
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bool start; // SWIPE used to define when start measuring GESTURES.Swipe.timeDuration
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double timeDuration; // SWIPE time to calculate drag intensity
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} Swipe;
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struct {
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Vector2 vector; // PINCH vector (between first and second touch points)
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float angle; // PINCH angle (relative to x-axis)
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float distance; // PINCH displacement distance (normalized [0..1])
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} Pinch;
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} GesturesData;
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//----------------------------------------------------------------------------------
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// Global Variables Definition
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//----------------------------------------------------------------------------------
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static GesturesData GESTURES = {
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.Touch.firstId = -1,
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.current = GESTURE_NONE, // No current gesture detected
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.enabledFlags = 0b0000001111111111 // All gestures supported by default
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};
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//----------------------------------------------------------------------------------
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// Module specific Functions Declaration
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//----------------------------------------------------------------------------------
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static float rgVector2Angle(Vector2 initialPosition, Vector2 finalPosition);
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static float rgVector2Distance(Vector2 v1, Vector2 v2);
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static double rgGetCurrentTime(void);
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//----------------------------------------------------------------------------------
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// Module Functions Definition
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//----------------------------------------------------------------------------------
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// Enable only desired getures to be detected
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void SetGesturesEnabled(unsigned int flags)
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{
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GESTURES.enabledFlags = flags;
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}
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// Check if a gesture have been detected
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bool IsGestureDetected(int gesture)
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{
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if ((GESTURES.enabledFlags & GESTURES.current) == gesture) return true;
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else return false;
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}
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// Process gesture event and translate it into gestures
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void ProcessGestureEvent(GestureEvent event)
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{
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// Reset required variables
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GESTURES.Touch.pointCount = event.pointCount; // Required on UpdateGestures()
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if (GESTURES.Touch.pointCount == 1) // One touch point
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{
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if (event.touchAction == TOUCH_ACTION_DOWN)
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{
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GESTURES.Touch.tapCounter++; // Tap counter
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// Detect GESTURE_DOUBLE_TAP
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if ((GESTURES.current == GESTURE_NONE) && (GESTURES.Touch.tapCounter >= 2) && ((rgGetCurrentTime() - GESTURES.Touch.eventTime) < TAP_TIMEOUT) && (rgVector2Distance(GESTURES.Touch.downPositionA, event.position[0]) < DOUBLETAP_RANGE))
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{
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GESTURES.current = GESTURE_DOUBLETAP;
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GESTURES.Touch.tapCounter = 0;
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}
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else // Detect GESTURE_TAP
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{
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GESTURES.Touch.tapCounter = 1;
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GESTURES.current = GESTURE_TAP;
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}
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GESTURES.Touch.downPositionA = event.position[0];
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GESTURES.Touch.downDragPosition = event.position[0];
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GESTURES.Touch.upPosition = GESTURES.Touch.downPositionA;
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GESTURES.Touch.eventTime = rgGetCurrentTime();
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GESTURES.Touch.firstId = event.pointId[0];
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GESTURES.Drag.vector = (Vector2){ 0.0f, 0.0f };
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}
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else if (event.touchAction == TOUCH_ACTION_UP)
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{
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if (GESTURES.current == GESTURE_DRAG) GESTURES.Touch.upPosition = event.position[0];
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// NOTE: GESTURES.Drag.intensity dependend on the resolution of the screen
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GESTURES.Drag.distance = rgVector2Distance(GESTURES.Touch.downPositionA, GESTURES.Touch.upPosition);
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GESTURES.Drag.intensity = GESTURES.Drag.distance/(float)((rgGetCurrentTime() - GESTURES.Swipe.timeDuration));
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GESTURES.Swipe.start = false;
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// Detect GESTURE_SWIPE
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if ((GESTURES.Drag.intensity > FORCE_TO_SWIPE) && (GESTURES.Touch.firstId == event.pointId[0]))
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{
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// NOTE: Angle should be inverted in Y
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GESTURES.Drag.angle = 360.0f - rgVector2Angle(GESTURES.Touch.downPositionA, GESTURES.Touch.upPosition);
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if ((GESTURES.Drag.angle < 30) || (GESTURES.Drag.angle > 330)) GESTURES.current = GESTURE_SWIPE_RIGHT; // Right
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else if ((GESTURES.Drag.angle > 30) && (GESTURES.Drag.angle < 120)) GESTURES.current = GESTURE_SWIPE_UP; // Up
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else if ((GESTURES.Drag.angle > 120) && (GESTURES.Drag.angle < 210)) GESTURES.current = GESTURE_SWIPE_LEFT; // Left
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else if ((GESTURES.Drag.angle > 210) && (GESTURES.Drag.angle < 300)) GESTURES.current = GESTURE_SWIPE_DOWN; // Down
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else GESTURES.current = GESTURE_NONE;
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}
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else
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{
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GESTURES.Drag.distance = 0.0f;
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GESTURES.Drag.intensity = 0.0f;
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GESTURES.Drag.angle = 0.0f;
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GESTURES.current = GESTURE_NONE;
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}
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GESTURES.Touch.downDragPosition = (Vector2){ 0.0f, 0.0f };
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GESTURES.Touch.pointCount = 0;
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}
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else if (event.touchAction == TOUCH_ACTION_MOVE)
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{
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if (GESTURES.current == GESTURE_DRAG) GESTURES.Touch.eventTime = rgGetCurrentTime();
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if (!GESTURES.Swipe.start)
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{
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GESTURES.Swipe.timeDuration = rgGetCurrentTime();
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GESTURES.Swipe.start = true;
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}
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GESTURES.Touch.moveDownPositionA = event.position[0];
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if (GESTURES.current == GESTURE_HOLD)
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{
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if (GESTURES.Hold.resetRequired) GESTURES.Touch.downPositionA = event.position[0];
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GESTURES.Hold.resetRequired = false;
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// Detect GESTURE_DRAG
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if (rgVector2Distance(GESTURES.Touch.downPositionA, GESTURES.Touch.moveDownPositionA) >= MINIMUM_DRAG)
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{
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GESTURES.Touch.eventTime = rgGetCurrentTime();
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GESTURES.current = GESTURE_DRAG;
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}
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}
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GESTURES.Drag.vector.x = GESTURES.Touch.moveDownPositionA.x - GESTURES.Touch.downDragPosition.x;
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GESTURES.Drag.vector.y = GESTURES.Touch.moveDownPositionA.y - GESTURES.Touch.downDragPosition.y;
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}
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}
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else if (GESTURES.Touch.pointCount == 2) // Two touch points
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{
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if (event.touchAction == TOUCH_ACTION_DOWN)
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{
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GESTURES.Touch.downPositionA = event.position[0];
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GESTURES.Touch.downPositionB = event.position[1];
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//GESTURES.Pinch.distance = rgVector2Distance(GESTURES.Touch.downPositionA, GESTURES.Touch.downPositionB);
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GESTURES.Pinch.vector.x = GESTURES.Touch.downPositionB.x - GESTURES.Touch.downPositionA.x;
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GESTURES.Pinch.vector.y = GESTURES.Touch.downPositionB.y - GESTURES.Touch.downPositionA.y;
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GESTURES.current = GESTURE_HOLD;
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GESTURES.Hold.timeDuration = rgGetCurrentTime();
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}
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else if (event.touchAction == TOUCH_ACTION_MOVE)
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{
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GESTURES.Pinch.distance = rgVector2Distance(GESTURES.Touch.moveDownPositionA, GESTURES.Touch.moveDownPositionB);
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GESTURES.Touch.downPositionA = GESTURES.Touch.moveDownPositionA;
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GESTURES.Touch.downPositionB = GESTURES.Touch.moveDownPositionB;
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GESTURES.Touch.moveDownPositionA = event.position[0];
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GESTURES.Touch.moveDownPositionB = event.position[1];
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GESTURES.Pinch.vector.x = GESTURES.Touch.moveDownPositionB.x - GESTURES.Touch.moveDownPositionA.x;
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GESTURES.Pinch.vector.y = GESTURES.Touch.moveDownPositionB.y - GESTURES.Touch.moveDownPositionA.y;
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if ((rgVector2Distance(GESTURES.Touch.downPositionA, GESTURES.Touch.moveDownPositionA) >= MINIMUM_PINCH) || (rgVector2Distance(GESTURES.Touch.downPositionB, GESTURES.Touch.moveDownPositionB) >= MINIMUM_PINCH))
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{
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if ((rgVector2Distance(GESTURES.Touch.moveDownPositionA, GESTURES.Touch.moveDownPositionB) - GESTURES.Pinch.distance) < 0) GESTURES.current = GESTURE_PINCH_IN;
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else GESTURES.current = GESTURE_PINCH_OUT;
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}
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else
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{
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GESTURES.current = GESTURE_HOLD;
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GESTURES.Hold.timeDuration = rgGetCurrentTime();
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}
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// NOTE: Angle should be inverted in Y
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GESTURES.Pinch.angle = 360.0f - rgVector2Angle(GESTURES.Touch.moveDownPositionA, GESTURES.Touch.moveDownPositionB);
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}
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else if (event.touchAction == TOUCH_ACTION_UP)
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{
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GESTURES.Pinch.distance = 0.0f;
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GESTURES.Pinch.angle = 0.0f;
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GESTURES.Pinch.vector = (Vector2){ 0.0f, 0.0f };
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GESTURES.Touch.pointCount = 0;
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GESTURES.current = GESTURE_NONE;
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}
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}
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else if (GESTURES.Touch.pointCount > 2) // More than two touch points
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{
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// TODO: Process gesture events for more than two points
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}
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}
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// Update gestures detected (must be called every frame)
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void UpdateGestures(void)
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{
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// NOTE: Gestures are processed through system callbacks on touch events
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// Detect GESTURE_HOLD
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if (((GESTURES.current == GESTURE_TAP) || (GESTURES.current == GESTURE_DOUBLETAP)) && (GESTURES.Touch.pointCount < 2))
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{
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GESTURES.current = GESTURE_HOLD;
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GESTURES.Hold.timeDuration = rgGetCurrentTime();
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}
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if (((rgGetCurrentTime() - GESTURES.Touch.eventTime) > TAP_TIMEOUT) && (GESTURES.current == GESTURE_DRAG) && (GESTURES.Touch.pointCount < 2))
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{
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GESTURES.current = GESTURE_HOLD;
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GESTURES.Hold.timeDuration = rgGetCurrentTime();
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GESTURES.Hold.resetRequired = true;
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}
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// Detect GESTURE_NONE
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if ((GESTURES.current == GESTURE_SWIPE_RIGHT) || (GESTURES.current == GESTURE_SWIPE_UP) || (GESTURES.current == GESTURE_SWIPE_LEFT) || (GESTURES.current == GESTURE_SWIPE_DOWN))
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{
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GESTURES.current = GESTURE_NONE;
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}
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}
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// Get latest detected gesture
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int GetGestureDetected(void)
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{
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// Get current gesture only if enabled
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return (GESTURES.enabledFlags & GESTURES.current);
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}
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// Hold time measured in ms
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float GetGestureHoldDuration(void)
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{
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// NOTE: time is calculated on current gesture HOLD
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double time = 0.0;
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if (GESTURES.current == GESTURE_HOLD) time = rgGetCurrentTime() - GESTURES.Hold.timeDuration;
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return (float)time;
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}
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// Get drag vector (between initial touch point to current)
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Vector2 GetGestureDragVector(void)
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{
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// NOTE: drag vector is calculated on one touch points TOUCH_ACTION_MOVE
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return GESTURES.Drag.vector;
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}
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// Get drag angle
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// NOTE: Angle in degrees, horizontal-right is 0, counterclock-wise
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float GetGestureDragAngle(void)
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|
{
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|
// NOTE: drag angle is calculated on one touch points TOUCH_ACTION_UP
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|
|
|
return GESTURES.Drag.angle;
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|
}
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|
|
|
// Get distance between two pinch points
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|
Vector2 GetGesturePinchVector(void)
|
|
{
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|
// NOTE: Pinch distance is calculated on two touch points TOUCH_ACTION_MOVE
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|
|
|
return GESTURES.Pinch.vector;
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|
}
|
|
|
|
// Get angle beween two pinch points
|
|
// NOTE: Angle in degrees, horizontal-right is 0, counterclock-wise
|
|
float GetGesturePinchAngle(void)
|
|
{
|
|
// NOTE: pinch angle is calculated on two touch points TOUCH_ACTION_MOVE
|
|
|
|
return GESTURES.Pinch.angle;
|
|
}
|
|
|
|
//----------------------------------------------------------------------------------
|
|
// Module specific Functions Definition
|
|
//----------------------------------------------------------------------------------
|
|
// Get angle from two-points vector with X-axis
|
|
static float rgVector2Angle(Vector2 v1, Vector2 v2)
|
|
{
|
|
float angle = atan2f(v2.y - v1.y, v2.x - v1.x)*(180.0f/PI);
|
|
|
|
if (angle < 0) angle += 360.0f;
|
|
|
|
return angle;
|
|
}
|
|
|
|
// Calculate distance between two Vector2
|
|
static float rgVector2Distance(Vector2 v1, Vector2 v2)
|
|
{
|
|
float result;
|
|
|
|
float dx = v2.x - v1.x;
|
|
float dy = v2.y - v1.y;
|
|
|
|
result = (float)sqrt(dx*dx + dy*dy);
|
|
|
|
return result;
|
|
}
|
|
|
|
// Time measure returned are milliseconds
|
|
static double rgGetCurrentTime(void)
|
|
{
|
|
double time = 0;
|
|
|
|
#if defined(_WIN32)
|
|
unsigned long long int clockFrequency, currentTime;
|
|
|
|
QueryPerformanceFrequency(&clockFrequency); // BE CAREFUL: Costly operation!
|
|
QueryPerformanceCounter(¤tTime);
|
|
|
|
time = (double)currentTime/clockFrequency*1000.0f; // Time in miliseconds
|
|
#endif
|
|
|
|
#if defined(__linux__)
|
|
// NOTE: Only for Linux-based systems
|
|
struct timespec now;
|
|
clock_gettime(CLOCK_MONOTONIC, &now);
|
|
unsigned long long int nowTime = (unsigned long long int)now.tv_sec*1000000000LLU + (unsigned long long int)now.tv_nsec; // Time in nanoseconds
|
|
|
|
time = ((double)nowTime/1000000.0); // Time in miliseconds
|
|
#endif
|
|
|
|
#if defined(__APPLE__)
|
|
//#define CLOCK_REALTIME CALENDAR_CLOCK // returns UTC time since 1970-01-01
|
|
//#define CLOCK_MONOTONIC SYSTEM_CLOCK // returns the time since boot time
|
|
|
|
clock_serv_t cclock;
|
|
mach_timespec_t now;
|
|
host_get_clock_service(mach_host_self(), SYSTEM_CLOCK, &cclock);
|
|
|
|
// NOTE: OS X does not have clock_gettime(), using clock_get_time()
|
|
clock_get_time(cclock, &now);
|
|
mach_port_deallocate(mach_task_self(), cclock);
|
|
unsigned long long int nowTime = (unsigned long long int)now.tv_sec*1000000000LLU + (unsigned long long int)now.tv_nsec; // Time in nanoseconds
|
|
|
|
time = ((double)nowTime/1000000.0); // Time in miliseconds
|
|
#endif
|
|
|
|
return time;
|
|
}
|
|
|
|
#endif // GESTURES_IMPLEMENTATION
|