/********************************************************************************************** * * rgestures - Gestures system, gestures processing based on input events (touch/mouse) * * NOTE: Memory footprint of this library is aproximately 128 bytes (global variables) * * CONFIGURATION: * * #define GESTURES_IMPLEMENTATION * Generates the implementation of the library into the included file. * If not defined, the library is in header only mode and can be included in other headers * or source files without problems. But only ONE file should hold the implementation. * * #define GESTURES_STANDALONE * If defined, the library can be used as standalone to process gesture events with * no external dependencies. * * CONTRIBUTORS: * Marc Palau: Initial implementation (2014) * Albert Martos: Complete redesign and testing (2015) * Ian Eito: Complete redesign and testing (2015) * Ramon Santamaria: Supervision, review, update and maintenance * * * LICENSE: zlib/libpng * * Copyright (c) 2014-2022 Ramon Santamaria (@raysan5) * * This software is provided "as-is", without any express or implied warranty. In no event * will the authors be held liable for any damages arising from the use of this software. * * Permission is granted to anyone to use this software for any purpose, including commercial * applications, and to alter it and redistribute it freely, subject to the following restrictions: * * 1. The origin of this software must not be misrepresented; you must not claim that you * wrote the original software. If you use this software in a product, an acknowledgment * in the product documentation would be appreciated but is not required. * * 2. Altered source versions must be plainly marked as such, and must not be misrepresented * as being the original software. * * 3. This notice may not be removed or altered from any source distribution. * **********************************************************************************************/ #ifndef RGESTURES_H #define RGESTURES_H #ifndef PI #define PI 3.14159265358979323846 #endif //---------------------------------------------------------------------------------- // Defines and Macros //---------------------------------------------------------------------------------- #ifndef MAX_TOUCH_POINTS #define MAX_TOUCH_POINTS 8 // Maximum number of touch points supported #endif //---------------------------------------------------------------------------------- // Types and Structures Definition // NOTE: Below types are required for GESTURES_STANDALONE usage //---------------------------------------------------------------------------------- // Boolean type #if (defined(__STDC__) && __STDC_VERSION__ >= 199901L) || (defined(_MSC_VER) && _MSC_VER >= 1800) #include #elif !defined(__cplusplus) && !defined(bool) && !defined(RL_BOOL_TYPE) typedef enum bool { false = 0, true = !false } bool; #endif #if !defined(RL_VECTOR2_TYPE) // Vector2 type typedef struct Vector2 { float x; float y; } Vector2; #endif #if defined(GESTURES_STANDALONE) // Gestures type // NOTE: It could be used as flags to enable only some gestures typedef enum { GESTURE_NONE = 0, GESTURE_TAP = 1, GESTURE_DOUBLETAP = 2, GESTURE_HOLD = 4, GESTURE_DRAG = 8, GESTURE_SWIPE_RIGHT = 16, GESTURE_SWIPE_LEFT = 32, GESTURE_SWIPE_UP = 64, GESTURE_SWIPE_DOWN = 128, GESTURE_PINCH_IN = 256, GESTURE_PINCH_OUT = 512 } Gesture; #endif typedef enum { TOUCH_ACTION_UP = 0, TOUCH_ACTION_DOWN, TOUCH_ACTION_MOVE, TOUCH_ACTION_CANCEL } TouchAction; // Gesture event typedef struct { int touchAction; int pointCount; int pointId[MAX_TOUCH_POINTS]; Vector2 position[MAX_TOUCH_POINTS]; } GestureEvent; //---------------------------------------------------------------------------------- // Global Variables Definition //---------------------------------------------------------------------------------- //... //---------------------------------------------------------------------------------- // Module Functions Declaration //---------------------------------------------------------------------------------- #if defined(__cplusplus) extern "C" { // Prevents name mangling of functions #endif void ProcessGestureEvent(GestureEvent event); // Process gesture event and translate it into gestures void UpdateGestures(void); // Update gestures detected (must be called every frame) #if defined(GESTURES_STANDALONE) void SetGesturesEnabled(unsigned int flags); // Enable a set of gestures using flags bool IsGestureDetected(int gesture); // Check if a gesture have been detected int GetGestureDetected(void); // Get latest detected gesture float GetGestureHoldDuration(void); // Get gesture hold time in milliseconds Vector2 GetGestureDragVector(void); // Get gesture drag vector float GetGestureDragAngle(void); // Get gesture drag angle Vector2 GetGesturePinchVector(void); // Get gesture pinch delta float GetGesturePinchAngle(void); // Get gesture pinch angle #endif #if defined(__cplusplus) } #endif #endif // GESTURES_H /*********************************************************************************** * * GESTURES IMPLEMENTATION * ************************************************************************************/ #if defined(GESTURES_IMPLEMENTATION) #if defined(GESTURES_STANDALONE) #if defined(_WIN32) #if defined(__cplusplus) extern "C" { // Prevents name mangling of functions #endif // Functions required to query time on Windows int __stdcall QueryPerformanceCounter(unsigned long long int *lpPerformanceCount); int __stdcall QueryPerformanceFrequency(unsigned long long int *lpFrequency); #if defined(__cplusplus) } #endif #elif defined(__linux__) #if _POSIX_C_SOURCE < 199309L #undef _POSIX_C_SOURCE #define _POSIX_C_SOURCE 199309L // Required for CLOCK_MONOTONIC if compiled with c99 without gnu ext. #endif #include // Required for: timespec #include // Required for: clock_gettime() #include // Required for: sqrtf(), atan2f() #endif #if defined(__APPLE__) // macOS also defines __MACH__ #include // Required for: clock_get_time() #include // Required for: mach_timespec_t #endif #endif //---------------------------------------------------------------------------------- // Defines and Macros //---------------------------------------------------------------------------------- #define FORCE_TO_SWIPE 0.0005f // Swipe force, measured in normalized screen units/time #define MINIMUM_DRAG 0.015f // Drag minimum force, measured in normalized screen units (0.0f to 1.0f) #define MINIMUM_PINCH 0.005f // Pinch minimum force, measured in normalized screen units (0.0f to 1.0f) #define TAP_TIMEOUT 300 // Tap minimum time, measured in milliseconds #define PINCH_TIMEOUT 300 // Pinch minimum time, measured in milliseconds #define DOUBLETAP_RANGE 0.03f // DoubleTap range, measured in normalized screen units (0.0f to 1.0f) //---------------------------------------------------------------------------------- // Types and Structures Definition //---------------------------------------------------------------------------------- // Gestures module state context [136 bytes] typedef struct { unsigned int current; // Current detected gesture unsigned int enabledFlags; // Enabled gestures flags struct { int firstId; // Touch id for first touch point int pointCount; // Touch points counter double eventTime; // Time stamp when an event happened Vector2 upPosition; // Touch up position Vector2 downPositionA; // First touch down position Vector2 downPositionB; // Second touch down position Vector2 downDragPosition; // Touch drag position Vector2 moveDownPositionA; // First touch down position on move Vector2 moveDownPositionB; // Second touch down position on move int tapCounter; // TAP counter (one tap implies TOUCH_ACTION_DOWN and TOUCH_ACTION_UP actions) } Touch; struct { bool resetRequired; // HOLD reset to get first touch point again double timeDuration; // HOLD duration in milliseconds } Hold; struct { Vector2 vector; // DRAG vector (between initial and current position) float angle; // DRAG angle (relative to x-axis) float distance; // DRAG distance (from initial touch point to final) (normalized [0..1]) float intensity; // DRAG intensity, how far why did the DRAG (pixels per frame) } Drag; struct { bool start; // SWIPE used to define when start measuring GESTURES.Swipe.timeDuration double timeDuration; // SWIPE time to calculate drag intensity } Swipe; struct { Vector2 vector; // PINCH vector (between first and second touch points) float angle; // PINCH angle (relative to x-axis) float distance; // PINCH displacement distance (normalized [0..1]) } Pinch; } GesturesData; //---------------------------------------------------------------------------------- // Global Variables Definition //---------------------------------------------------------------------------------- static GesturesData GESTURES = { .Touch.firstId = -1, .current = GESTURE_NONE, // No current gesture detected .enabledFlags = 0b0000001111111111 // All gestures supported by default }; //---------------------------------------------------------------------------------- // Module specific Functions Declaration //---------------------------------------------------------------------------------- static float rgVector2Angle(Vector2 initialPosition, Vector2 finalPosition); static float rgVector2Distance(Vector2 v1, Vector2 v2); static double rgGetCurrentTime(void); //---------------------------------------------------------------------------------- // Module Functions Definition //---------------------------------------------------------------------------------- // Enable only desired getures to be detected void SetGesturesEnabled(unsigned int flags) { GESTURES.enabledFlags = flags; } // Check if a gesture have been detected bool IsGestureDetected(int gesture) { if ((GESTURES.enabledFlags & GESTURES.current) == gesture) return true; else return false; } // Process gesture event and translate it into gestures void ProcessGestureEvent(GestureEvent event) { // Reset required variables GESTURES.Touch.pointCount = event.pointCount; // Required on UpdateGestures() if (GESTURES.Touch.pointCount == 1) // One touch point { if (event.touchAction == TOUCH_ACTION_DOWN) { GESTURES.Touch.tapCounter++; // Tap counter // Detect GESTURE_DOUBLE_TAP if ((GESTURES.current == GESTURE_NONE) && (GESTURES.Touch.tapCounter >= 2) && ((rgGetCurrentTime() - GESTURES.Touch.eventTime) < TAP_TIMEOUT) && (rgVector2Distance(GESTURES.Touch.downPositionA, event.position[0]) < DOUBLETAP_RANGE)) { GESTURES.current = GESTURE_DOUBLETAP; GESTURES.Touch.tapCounter = 0; } else // Detect GESTURE_TAP { GESTURES.Touch.tapCounter = 1; GESTURES.current = GESTURE_TAP; } GESTURES.Touch.downPositionA = event.position[0]; GESTURES.Touch.downDragPosition = event.position[0]; GESTURES.Touch.upPosition = GESTURES.Touch.downPositionA; GESTURES.Touch.eventTime = rgGetCurrentTime(); GESTURES.Touch.firstId = event.pointId[0]; GESTURES.Drag.vector = (Vector2){ 0.0f, 0.0f }; } else if (event.touchAction == TOUCH_ACTION_UP) { if (GESTURES.current == GESTURE_DRAG) GESTURES.Touch.upPosition = event.position[0]; // NOTE: GESTURES.Drag.intensity dependend on the resolution of the screen GESTURES.Drag.distance = rgVector2Distance(GESTURES.Touch.downPositionA, GESTURES.Touch.upPosition); GESTURES.Drag.intensity = GESTURES.Drag.distance/(float)((rgGetCurrentTime() - GESTURES.Swipe.timeDuration)); GESTURES.Swipe.start = false; // Detect GESTURE_SWIPE if ((GESTURES.Drag.intensity > FORCE_TO_SWIPE) && (GESTURES.Touch.firstId == event.pointId[0])) { // NOTE: Angle should be inverted in Y GESTURES.Drag.angle = 360.0f - rgVector2Angle(GESTURES.Touch.downPositionA, GESTURES.Touch.upPosition); if ((GESTURES.Drag.angle < 30) || (GESTURES.Drag.angle > 330)) GESTURES.current = GESTURE_SWIPE_RIGHT; // Right else if ((GESTURES.Drag.angle > 30) && (GESTURES.Drag.angle < 120)) GESTURES.current = GESTURE_SWIPE_UP; // Up else if ((GESTURES.Drag.angle > 120) && (GESTURES.Drag.angle < 210)) GESTURES.current = GESTURE_SWIPE_LEFT; // Left else if ((GESTURES.Drag.angle > 210) && (GESTURES.Drag.angle < 300)) GESTURES.current = GESTURE_SWIPE_DOWN; // Down else GESTURES.current = GESTURE_NONE; } else { GESTURES.Drag.distance = 0.0f; GESTURES.Drag.intensity = 0.0f; GESTURES.Drag.angle = 0.0f; GESTURES.current = GESTURE_NONE; } GESTURES.Touch.downDragPosition = (Vector2){ 0.0f, 0.0f }; GESTURES.Touch.pointCount = 0; } else if (event.touchAction == TOUCH_ACTION_MOVE) { if (GESTURES.current == GESTURE_DRAG) GESTURES.Touch.eventTime = rgGetCurrentTime(); if (!GESTURES.Swipe.start) { GESTURES.Swipe.timeDuration = rgGetCurrentTime(); GESTURES.Swipe.start = true; } GESTURES.Touch.moveDownPositionA = event.position[0]; if (GESTURES.current == GESTURE_HOLD) { if (GESTURES.Hold.resetRequired) GESTURES.Touch.downPositionA = event.position[0]; GESTURES.Hold.resetRequired = false; // Detect GESTURE_DRAG if (rgVector2Distance(GESTURES.Touch.downPositionA, GESTURES.Touch.moveDownPositionA) >= MINIMUM_DRAG) { GESTURES.Touch.eventTime = rgGetCurrentTime(); GESTURES.current = GESTURE_DRAG; } } GESTURES.Drag.vector.x = GESTURES.Touch.moveDownPositionA.x - GESTURES.Touch.downDragPosition.x; GESTURES.Drag.vector.y = GESTURES.Touch.moveDownPositionA.y - GESTURES.Touch.downDragPosition.y; } } else if (GESTURES.Touch.pointCount == 2) // Two touch points { if (event.touchAction == TOUCH_ACTION_DOWN) { GESTURES.Touch.downPositionA = event.position[0]; GESTURES.Touch.downPositionB = event.position[1]; //GESTURES.Pinch.distance = rgVector2Distance(GESTURES.Touch.downPositionA, GESTURES.Touch.downPositionB); GESTURES.Pinch.vector.x = GESTURES.Touch.downPositionB.x - GESTURES.Touch.downPositionA.x; GESTURES.Pinch.vector.y = GESTURES.Touch.downPositionB.y - GESTURES.Touch.downPositionA.y; GESTURES.current = GESTURE_HOLD; GESTURES.Hold.timeDuration = rgGetCurrentTime(); } else if (event.touchAction == TOUCH_ACTION_MOVE) { GESTURES.Pinch.distance = rgVector2Distance(GESTURES.Touch.moveDownPositionA, GESTURES.Touch.moveDownPositionB); GESTURES.Touch.downPositionA = GESTURES.Touch.moveDownPositionA; GESTURES.Touch.downPositionB = GESTURES.Touch.moveDownPositionB; GESTURES.Touch.moveDownPositionA = event.position[0]; GESTURES.Touch.moveDownPositionB = event.position[1]; GESTURES.Pinch.vector.x = GESTURES.Touch.moveDownPositionB.x - GESTURES.Touch.moveDownPositionA.x; GESTURES.Pinch.vector.y = GESTURES.Touch.moveDownPositionB.y - GESTURES.Touch.moveDownPositionA.y; if ((rgVector2Distance(GESTURES.Touch.downPositionA, GESTURES.Touch.moveDownPositionA) >= MINIMUM_PINCH) || (rgVector2Distance(GESTURES.Touch.downPositionB, GESTURES.Touch.moveDownPositionB) >= MINIMUM_PINCH)) { if ((rgVector2Distance(GESTURES.Touch.moveDownPositionA, GESTURES.Touch.moveDownPositionB) - GESTURES.Pinch.distance) < 0) GESTURES.current = GESTURE_PINCH_IN; else GESTURES.current = GESTURE_PINCH_OUT; } else { GESTURES.current = GESTURE_HOLD; GESTURES.Hold.timeDuration = rgGetCurrentTime(); } // NOTE: Angle should be inverted in Y GESTURES.Pinch.angle = 360.0f - rgVector2Angle(GESTURES.Touch.moveDownPositionA, GESTURES.Touch.moveDownPositionB); } else if (event.touchAction == TOUCH_ACTION_UP) { GESTURES.Pinch.distance = 0.0f; GESTURES.Pinch.angle = 0.0f; GESTURES.Pinch.vector = (Vector2){ 0.0f, 0.0f }; GESTURES.Touch.pointCount = 0; GESTURES.current = GESTURE_NONE; } } else if (GESTURES.Touch.pointCount > 2) // More than two touch points { // TODO: Process gesture events for more than two points } } // Update gestures detected (must be called every frame) void UpdateGestures(void) { // NOTE: Gestures are processed through system callbacks on touch events // Detect GESTURE_HOLD if (((GESTURES.current == GESTURE_TAP) || (GESTURES.current == GESTURE_DOUBLETAP)) && (GESTURES.Touch.pointCount < 2)) { GESTURES.current = GESTURE_HOLD; GESTURES.Hold.timeDuration = rgGetCurrentTime(); } if (((rgGetCurrentTime() - GESTURES.Touch.eventTime) > TAP_TIMEOUT) && (GESTURES.current == GESTURE_DRAG) && (GESTURES.Touch.pointCount < 2)) { GESTURES.current = GESTURE_HOLD; GESTURES.Hold.timeDuration = rgGetCurrentTime(); GESTURES.Hold.resetRequired = true; } // Detect GESTURE_NONE if ((GESTURES.current == GESTURE_SWIPE_RIGHT) || (GESTURES.current == GESTURE_SWIPE_UP) || (GESTURES.current == GESTURE_SWIPE_LEFT) || (GESTURES.current == GESTURE_SWIPE_DOWN)) { GESTURES.current = GESTURE_NONE; } } // Get latest detected gesture int GetGestureDetected(void) { // Get current gesture only if enabled return (GESTURES.enabledFlags & GESTURES.current); } // Hold time measured in ms float GetGestureHoldDuration(void) { // NOTE: time is calculated on current gesture HOLD double time = 0.0; if (GESTURES.current == GESTURE_HOLD) time = rgGetCurrentTime() - GESTURES.Hold.timeDuration; return (float)time; } // Get drag vector (between initial touch point to current) Vector2 GetGestureDragVector(void) { // NOTE: drag vector is calculated on one touch points TOUCH_ACTION_MOVE return GESTURES.Drag.vector; } // Get drag angle // NOTE: Angle in degrees, horizontal-right is 0, counterclock-wise float GetGestureDragAngle(void) { // NOTE: drag angle is calculated on one touch points TOUCH_ACTION_UP return GESTURES.Drag.angle; } // Get distance between two pinch points Vector2 GetGesturePinchVector(void) { // NOTE: Pinch distance is calculated on two touch points TOUCH_ACTION_MOVE return GESTURES.Pinch.vector; } // 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(GESTURES_STANDALONE) time = GetTime(); #else #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 #endif return time; } #endif // GESTURES_IMPLEMENTATION