Added Gestures System for Android and Web

src/core.c

@@ -158,22 +158,6 @@ static struct android_poll_source *source;      // Android events polling source
 static int ident, events;
 static bool windowReady = false;                // Used to detect display initialization
 
-// Gestures detection variables
-static float tapTouchX, tapTouchY;
-static int64_t lastTapTime = 0;
-static float lastTapX = 0, lastTapY = 0;
-static bool touchTap = false;
-static bool doubleTap = false;
-static bool drag = false;
-static int stdVector[MAX_TOUCH_POINTS];
-static int indexPosition = 0;
-const AInputEvent* eventDrag;
-static int32_t touchId;
-const int32_t DOUBLE_TAP_TIMEOUT = 300*1000000;
-const int32_t DOUBLE_TAP_SLOP = 100;
-const int32_t TAP_TIMEOUT = 180*1000000;
-const int32_t TOUCH_SLOP = 8;
-
 #elif defined(PLATFORM_RPI)
 static EGL_DISPMANX_WINDOW_T nativeWindow;      // Native window (graphic device)
 
@@ -241,11 +225,6 @@ static int exitKey = KEY_ESCAPE;            // Default exit key (ESC)
 static int lastKeyPressed = -1;
 #endif
 
-#if defined(PLATFORM_ANDROID)
-static float touchX;                        // Touch position X
-static float touchY;                        // Touch position Y
-#endif
-
 static double currentTime, previousTime;    // Used to track timmings
 static double updateTime, drawTime;         // Time measures for update and draw
 static double frameTime;                    // Time measure for one frame
@@ -276,6 +255,17 @@ extern void UnloadDefaultFont(void);            // [Module: text] Unloads defaul
 
 extern void UpdateMusicStream(void);            // [Module: audio] Updates buffers for music streaming
 
+extern Vector2 GetRawPosition(void);
+extern void ResetGestures(void);
+
+#if defined(PLATFORM_ANDROID)
+extern void InitAndroidGestures(struct android_app *app);
+#endif
+
+#if defined(PLATFORM_WEB)
+extern void InitWebGestures(void);
+#endif
+
 //----------------------------------------------------------------------------------
 // Module specific Functions Declaration
 //----------------------------------------------------------------------------------
@@ -313,8 +303,7 @@ static void TakeScreenshot(void);
 #endif
 
 #if defined(PLATFORM_ANDROID)
-static int32_t InputCallback(struct android_app *app, AInputEvent *event);   // Process Android activity input events
+static void AndroidCommandCallback(struct android_app *app, int32_t cmd);                  // Process Android activity lifecycle commands
-static void CommandCallback(struct android_app *app, int32_t cmd);           // Process Android activity lifecycle commands
 #endif
 
 static void ProcessCamera(Camera *camera, Vector3 *playerPosition);
@@ -350,6 +339,11 @@ void InitWindow(int width, int height, const char *title)
     InitKeyboard();     // Keyboard init
     InitGamepad();      // Gamepad init
 #endif
+
+#if defined(PLATFORM_WEB)
+    InitWebGestures();  // Init touch input events for web
+#endif
+
     mousePosition.x = screenWidth/2;
     mousePosition.y = screenHeight/2;
 
@@ -401,8 +395,9 @@ void InitWindow(int width, int height, struct android_app *state)
     //AConfiguration_getScreenLong(app->config);
 
     //state->userData = &engine;
-    app->onAppCmd = CommandCallback;
+    app->onAppCmd = AndroidCommandCallback;
-    app->onInputEvent = InputCallback;
+    
+    InitAndroidGestures(app);
 
     InitAssetManager(app->activity->assetManager);
 
@@ -557,6 +552,11 @@ void EndDrawing(void)
     if (enabledPostpro) rlglDrawPostpro(); // Draw postprocessing effect (shader)
 
     SwapBuffers();                  // Copy back buffer to front buffer
+
+#if defined(PLATFORM_ANDROID) || defined(PLATFORM_WEB)
+    ResetGestures();
+#endif
+
     PollInputEvents();              // Poll user events
 
     UpdateMusicStream();            // NOTE: Function checks if music is enabled
@@ -1053,63 +1053,37 @@ bool IsGamepadButtonUp(int gamepad, int button)
 #endif
 
 #if defined(PLATFORM_ANDROID)
-bool IsScreenTouched(void)
-{
-    return touchTap;
-}
-
-bool IsDoubleTap(void)
-{
-    if (doubleTap) TraceLog(INFO, "DOUBLE TAP gesture detected");
-
-    return doubleTap;
-}
-
-bool IsDragGesture(void)
-{
-    return drag;
-}
-
 // Returns touch position X
 int GetTouchX(void)
 {
-    return (int)touchX;
+    return (int)GetRawPosition().x;
 }
 
 // Returns touch position Y
 int GetTouchY(void)
 {
-    return (int)touchY;
+    return (int)GetRawPosition().y;
 }
 
 // Returns touch position XY
 Vector2 GetTouchPosition(void)
 {
-    Vector2 position = { touchX, touchY };
+    Vector2 position = GetRawPosition();
+    
+    if ((screenWidth > displayWidth) || (screenHeight > displayHeight))
+    {
+        // TODO: Seems to work ok but... review!
+        position.x = position.x*((float)screenWidth / (float)(displayWidth - renderOffsetX)) - renderOffsetX/2;
+        position.y = position.y*((float)screenHeight / (float)(displayHeight - renderOffsetY)) - renderOffsetY/2;
+    }
+    else
+    {
+        position.x = position.x*((float)renderWidth / (float)displayWidth) - renderOffsetX/2;
+        position.y = position.y*((float)renderHeight / (float)displayHeight) - renderOffsetY/2;
+    }
 
     return position;
 }
-
-/*bool GetPointer(Vector2 *dragPositions)
-{
-    //static int stdVector[MAX_TOUCH_POINTS];
-    //static int indexPosition = 0;
-    //if (indexPosition == 0) return false;
-    Vector2 vec_pointers_[];
-
-    //eventDrag
-    int32_t iIndex = FindIndex( eventDrag, vec_pointers_[0] );
-
-    if (iIndex == -1) return false;
-
-    float x = AMotionEvent_getX(eventDrag, iIndex);
-    float y = AMotionEvent_getY(eventDrag, iIndex);
-
-    *dragPositions = Vector2( x, y );
-
-
-    return true;
-}*/
 #endif
 
 // Set postprocessing shader
@@ -1499,209 +1473,8 @@ static void WindowIconifyCallback(GLFWwindow* window, int iconified)
 #endif
 
 #if defined(PLATFORM_ANDROID)
-// Android: Process activity input events
-static int32_t InputCallback(struct android_app *app, AInputEvent *event)
-{
-    int type = AInputEvent_getType(event);
-    //int32_t key = 0;
-
-    if (type == AINPUT_EVENT_TYPE_MOTION)
-    {
-        // Detect TOUCH position
-        if ((screenWidth > displayWidth) || (screenHeight > displayHeight))
-        {
-            // TODO: Seems to work ok but... review!
-            touchX = AMotionEvent_getX(event, 0) * ((float)screenWidth / (float)(displayWidth - renderOffsetX)) - renderOffsetX/2;
-            touchY = AMotionEvent_getY(event, 0) * ((float)screenHeight / (float)(displayHeight - renderOffsetY)) - renderOffsetY/2;
-        }
-        else
-        {
-            touchX = AMotionEvent_getX(event, 0) * ((float)renderWidth / (float)displayWidth) - renderOffsetX/2;
-            touchY = AMotionEvent_getY(event, 0) * ((float)renderHeight / (float)displayHeight) - renderOffsetY/2;
-        }
-
-        // Detect TAP event
-/*
-        if (AMotionEvent_getPointerCount(event) > 1 )
-        {
-            // Only support single touch
-            return false;
-        }
-*/
-        int32_t action = AMotionEvent_getAction(event);
-        unsigned int flags = action & AMOTION_EVENT_ACTION_MASK;
-
-        switch (flags)
-        {
-            case AMOTION_EVENT_ACTION_DOWN:
-            {
-                touchId = AMotionEvent_getPointerId(event, 0);
-                tapTouchX = AMotionEvent_getX(event, 0);
-                tapTouchY = AMotionEvent_getY(event, 0);
-
-            } break;
-            case AMOTION_EVENT_ACTION_UP:
-            {
-                int64_t eventTime = AMotionEvent_getEventTime(event);
-                int64_t downTime = AMotionEvent_getDownTime(event);
-
-                if (eventTime - downTime <= TAP_TIMEOUT)
-                {
-                    if (touchId == AMotionEvent_getPointerId(event, 0))
-                    {
-                        float x = AMotionEvent_getX(event, 0) - tapTouchX;
-                        float y = AMotionEvent_getY(event, 0) - tapTouchY;
-
-                        float densityFactor = 1.0f;
-
-                        if ( x*x + y*y < TOUCH_SLOP*TOUCH_SLOP * densityFactor)
-                        {
-                            // TAP Detected
-                            touchTap = true;
-                        }
-                    }
-                }
-                break;
-            }
-        }
-
-        //float AMotionEvent_getX(event, size_t pointer_index);
-        //int32_t AMotionEvent_getButtonState(event); // Pressed buttons
-        //int32_t AMotionEvent_getPointerId(event, size_t pointer_index);
-        //size_t pointerCount =  AMotionEvent_getPointerCount(event);
-        //float AMotionEvent_getPressure(const AInputEvent *motion_event, size_t pointer_index); // 0 to 1
-        //float AMotionEvent_getSize(const AInputEvent *motion_event, size_t pointer_index); // Pressed area
-
-        // Detect DOUBLE TAP event
-        bool tapDetected = touchTap;
-
-        switch (flags)
-        {
-            case AMOTION_EVENT_ACTION_DOWN:
-            {
-                int64_t eventTime = AMotionEvent_getEventTime(event);
-
-                if (eventTime - lastTapTime <= DOUBLE_TAP_TIMEOUT)
-                {
-                    float x = AMotionEvent_getX(event, 0) - lastTapX;
-                    float y = AMotionEvent_getY(event, 0) - lastTapY;
-
-                    float densityFactor = 1.0f;
-
-                    if ((x*x + y*y) < (DOUBLE_TAP_SLOP*DOUBLE_TAP_SLOP*densityFactor))
-                    {
-                        // Doubletap detected
-                        doubleTap = true;
-
-                    }
-                }
-            } break;
-            case AMOTION_EVENT_ACTION_UP:
-            {
-                if (tapDetected)
-                {
-                    lastTapTime = AMotionEvent_getEventTime(event);
-                    lastTapX = AMotionEvent_getX(event, 0);
-                    lastTapY = AMotionEvent_getY(event, 0);
-
-                }
-            } break;
-        }
-
-
-        // Detect DRAG event
-        //int32_t action = AMotionEvent_getAction(event);
-
-        int32_t index = (action & AMOTION_EVENT_ACTION_POINTER_INDEX_MASK) >> AMOTION_EVENT_ACTION_POINTER_INDEX_SHIFT;
-        //uint32_t flags = action & AMOTION_EVENT_ACTION_MASK;
-        //event_ = event;
-
-        int32_t count = AMotionEvent_getPointerCount(event);
-
-        switch (flags)
-        {
-            case AMOTION_EVENT_ACTION_DOWN:
-            {
-                stdVector[indexPosition] = AMotionEvent_getPointerId(event, 0);
-                indexPosition++;
-                TraceLog(INFO, "ACTION_DOWN");
-
-                //ret = GESTURE_STATE_START;
-            } break;
-            case AMOTION_EVENT_ACTION_POINTER_DOWN:
-            {
-                stdVector[indexPosition] = AMotionEvent_getPointerId(event, index);
-                indexPosition++;
-                TraceLog(INFO, "ACTION_POINTER_DOWN");
-
-            } break;
-            case AMOTION_EVENT_ACTION_UP:
-            {
-                //int value = stdVector[indexPosition];
-                indexPosition--;
-                //ret = GESTURE_STATE_END;
-                TraceLog(INFO, "ACTION_UP");
-
-            } break;
-            case AMOTION_EVENT_ACTION_POINTER_UP:
-            {
-                int32_t releasedPointerId = AMotionEvent_getPointerId(event, index);
-
-                int i = 0;
-                for (i = 0; i < MAX_TOUCH_POINTS; i++)
-                {
-                    if (stdVector[i] == releasedPointerId)
-                    {
-                        for (int k = i; k < indexPosition - 1; k++)
-                        {
-                            stdVector[k] = stdVector[k + 1];
-                        }
-
-                        //indexPosition--;
-                        indexPosition = 0;
-                        break;
-                    }
-                }
-
-                if (i <= 1)
-                {
-                    // Reset pinch or drag
-                    //if (count == 2) //ret = GESTURE_STATE_START;
-                }
-                TraceLog(INFO, "ACTION_POINTER_UP");
-
-            } break;
-            case AMOTION_EVENT_ACTION_MOVE:
-            {
-                if (count == 1)
-                {
-                    //TraceLog(INFO, "DRAG gesture detected");
-
-                    drag = true; //ret = GESTURE_STATE_MOVE;
-                }
-                else break;
-                TraceLog(INFO, "ACTION_MOVE");
-
-            } break;
-            case AMOTION_EVENT_ACTION_CANCEL: break;
-            default: break;
-        }
-
-        //--------------------------------------------------------------------
-
-        return 1;
-    }
-    else if (type == AINPUT_EVENT_TYPE_KEY)
-    {
-        //key = AKeyEvent_getKeyCode(event);
-        //int32_t AKeyEvent_getMetaState(event);
-    }
-
-    return 0;
-}
-
 // Android: Process activity lifecycle commands
-static void CommandCallback(struct android_app *app, int32_t cmd)
+static void AndroidCommandCallback(struct android_app *app, int32_t cmd)
 {
     switch (cmd)
     {
@@ -1905,11 +1678,6 @@ static void PollInputEvents(void)
 
     // TODO: Check virtual keyboard (?)
 
-    // Reset touch events
-    touchTap = false;
-    doubleTap = false;
-    drag = false;
-
     // Poll Events (registered events)
     // TODO: Enable/disable activityMinimized to block activity if minimized
     //while ((ident = ALooper_pollAll(activityMinimized ? 0 : -1, NULL, &events,(void**)&source)) >= 0)
@@ -2397,6 +2165,7 @@ static void LogoAnimation(void)
 // Process desired camera mode and controls
 static void ProcessCamera(Camera *camera, Vector3 *playerPosition)
 {
+#if defined(PLATFORM_DESKTOP) || defined(PLATFORM_WEB) || defined(PLATFORM_RPI)
     // Mouse movement detection
     if (cameraMode != CAMERA_FREE)
     {
@@ -2647,4 +2416,5 @@ static void ProcessCamera(Camera *camera, Vector3 *playerPosition)
         } break;
         default: break;
     }
+#endif
 }

src/gestures.c

@@ -0,0 +1,636 @@
+/**********************************************************************************************
+*
+*   raylib.gestures
+*
+*   Gestures Detection and Usage Functions Definitions
+*
+*   Copyright (c) 2015 Marc Palau and Ramon Santamaria
+*
+*   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.
+*
+**********************************************************************************************/
+
+#include "raylib.h"
+#include "raymath.h"
+#include "utils.h"
+
+#include <stdlib.h>             // malloc(), free()
+#include <stdio.h>              // printf(), fprintf()
+#include <math.h>               // Used for ...
+#include <time.h>
+
+#if defined(PLATFORM_ANDROID)
+    #include <jni.h>                        // Java native interface
+    #include <android/sensor.h>             // Android sensors functions
+    #include <android/window.h>             // Defines AWINDOW_FLAG_FULLSCREEN and others
+#endif
+
+#if defined(PLATFORM_WEB)
+    #include <emscripten/emscripten.h>
+    #include <emscripten/emscripten/html5.h>
+#endif
+
+//----------------------------------------------------------------------------------
+// Defines and Macros
+//----------------------------------------------------------------------------------
+#define FORCE_TO_SWIPE          20
+#define TAP_TIMEOUT             300
+
+#define MAX_TOUCH_POINTS        4
+
+typedef enum {
+    TYPE_MOTIONLESS,
+    TYPE_DRAG,
+    TYPE_DUAL_INPUT
+} GestureType;
+
+typedef enum {
+    UP,
+    DOWN,
+    MOVE
+} ActionType;
+
+typedef struct {
+    ActionType action;
+    int pointCount;
+    int pointerId[MAX_TOUCH_POINTS];
+    Vector2 position[MAX_TOUCH_POINTS];
+} GestureEvent;
+
+//----------------------------------------------------------------------------------
+// Global Variables Definition
+//----------------------------------------------------------------------------------
+
+// typedef
+static GestureType gestureType = TYPE_MOTIONLESS;
+
+// Gestures detection variables
+static int32_t touchId;
+
+// Event
+static int64_t eventTime = 0;
+
+// Tap
+// Our initial press position on tap
+static Vector2 initialTapPosition = { 0, 0 };
+
+// Double tap
+// If we are double tapping or not
+static bool doubleTapping = false;
+// If we recently made a tap
+static bool untap = false;
+
+// Drag
+// Our initial press position on drag
+static Vector2 initialDragPosition = { 0, 0 };
+// Position that will compare itself with the mouse one
+static Vector2 endDragPosition = { 0, 0 };
+// Position of the last event detection
+static Vector2 lastDragPosition = { 0, 0 };
+// The total drag vector
+static Vector2 dragVector = { 0, 0 };
+// The distance traveled dragging
+static float magnitude = 0;
+// The angle direction of the drag
+static float angle = 0;
+// A magnitude to calculate how fast we did the drag ( pixels per frame )
+static float intensity = 0;
+// Time that have passed while dragging
+static int draggingTimeCounter = 0;
+
+// Pinch
+// First initial pinch position
+static Vector2 firstInitialPinchPosition = { 0, 0 };
+// Second initial pinch position
+static Vector2 secondInitialPinchPosition = { 0, 0 };
+// First end pinch position
+static Vector2 firstEndPinchPosition = { 0, 0 };
+// Second end pinch position
+static Vector2 secondEndPinchPosition = { 0, 0 };
+// Delta Displacement
+static float pinchDelta = 0;
+
+// Detected gesture
+static int currentGesture = GESTURE_NONE;
+
+static float touchX, touchY;
+
+//----------------------------------------------------------------------------------
+// Module specific Functions Declaration
+//----------------------------------------------------------------------------------
+extern void ProcessMotionEvent(GestureEvent event);
+extern void ResetGestures(void);
+extern Vector2 GetRawPosition(void);
+
+static float CalculateAngle(Vector2 initialPosition, Vector2 actualPosition, float magnitude);
+static float OnPinch();
+static void SetDualInput(GestureEvent event);
+static float Distance(Vector2 v1, Vector2 v2);
+static float DotProduct(Vector2 v1, Vector2 v2);
+static int GetCurrentTime();
+
+#if defined(PLATFORM_WEB)
+static EM_BOOL EmscriptenInputCallback(int eventType, const EmscriptenTouchEvent *touchEvent, void *userData);
+#endif
+
+#if defined(PLATFORM_ANDROID)
+static int32_t AndroidInputCallback(struct android_app *app, AInputEvent *event);
+#endif
+
+//----------------------------------------------------------------------------------
+// Module Functions Definition
+//----------------------------------------------------------------------------------
+
+// Returns tap position XY
+extern Vector2 GetRawPosition(void)
+{
+    Vector2 position = { touchX, touchY };
+
+    return position;
+}
+
+// Check if a gesture have been detected
+bool IsGestureDetected(void)
+{
+    if (currentGesture == GESTURE_DRAG)                 TraceLog(INFO, "DRAG");
+    else if (currentGesture == GESTURE_TAP)             TraceLog(INFO, "TAP");
+    else if (currentGesture == GESTURE_DOUBLETAP)       TraceLog(INFO, "DOUBLE");
+    else if (currentGesture == GESTURE_HOLD)            TraceLog(INFO, "HOLD");
+    else if (currentGesture == GESTURE_SWIPE_RIGHT)     TraceLog(INFO, "RIGHT");
+    else if (currentGesture == GESTURE_SWIPE_UP)        TraceLog(INFO, "UP");
+    else if (currentGesture == GESTURE_SWIPE_LEFT)      TraceLog(INFO, "LEFT");
+    else if (currentGesture == GESTURE_SWIPE_DOWN)      TraceLog(INFO, "DOWN");
+    else if (currentGesture == GESTURE_PINCH_IN)        TraceLog(INFO, "PINCH IN");
+    else if (currentGesture == GESTURE_PINCH_OUT)       TraceLog(INFO, "PINCH OUT");
+
+    if (currentGesture != GESTURE_NONE) return false;
+    else return true;
+}
+
+// Check gesture type
+int GetGestureType(void)
+{
+    return currentGesture;
+}
+
+// Get drag intensity (pixels per frame)
+float GetDragIntensity(void)
+{
+    return intensity;
+}
+
+// Get drag angle
+// NOTE: Angle in degrees, horizontal-right is 0, counterclock-wise
+float GetDragAngle(void)
+{
+    return angle;
+}
+
+// Get drag vector (between initial and final position)
+Vector2 GetDragVector(void)
+{
+    return dragVector;
+}
+
+// Hold time measured in frames
+int GetHoldDuration(void)
+{
+    return 0;
+}
+
+// Get magnitude between two pinch points
+float GetPinchDelta(void)
+{
+    return pinchDelta;
+}
+
+// Get angle beween two  pinch points
+// NOTE: Angle in degrees, horizontal-right is 0, counterclock-wise
+float GetPinchAngle(void)
+{
+    return 0;
+}
+
+extern void ResetGestures(void)
+{
+    if (currentGesture != GESTURE_HOLD) currentGesture = GESTURE_NONE;
+}
+
+#if defined(PLATFORM_WEB)
+extern void InitWebGestures(void)
+{
+    /*
+    emscripten_set_touchstart_callback("#canvas", data, 0, Emscripten_HandleTouch);
+    emscripten_set_touchend_callback("#canvas", data, 0, Emscripten_HandleTouch);
+    emscripten_set_touchmove_callback("#canvas", data, 0, Emscripten_HandleTouch);
+    emscripten_set_touchcancel_callback("#canvas", data, 0, Emscripten_HandleTouch);
+    */
+
+    //emscripten_set_touchstart_callback(0, NULL, 1, Emscripten_HandleTouch);
+    
+    emscripten_set_touchstart_callback("#canvas", NULL, 1, EmscriptenInputCallback);
+    emscripten_set_touchend_callback("#canvas", NULL, 1, EmscriptenInputCallback);
+    emscripten_set_touchmove_callback("#canvas", NULL, 1, EmscriptenInputCallback);
+    emscripten_set_touchcancel_callback("#canvas", NULL, 1, EmscriptenInputCallback);
+}
+#endif
+
+#if defined(PLATFORM_ANDROID)
+extern void InitAndroidGestures(struct android_app *app)
+{
+    app->onInputEvent = AndroidInputCallback;
+    
+    // TODO: Receive frameBuffer data: displayWidth/displayHeight, renderWidth/renderHeight, screenWidth/screenHeight
+}
+#endif
+
+//----------------------------------------------------------------------------------
+// Module specific Functions Definition
+//----------------------------------------------------------------------------------
+extern void ProcessMotionEvent(GestureEvent event)
+{
+    // Resets
+    dragVector = (Vector2){ 0, 0 };
+    pinchDelta = 0;
+    
+    switch (gestureType)
+    {
+        case TYPE_MOTIONLESS: // Detect TAP, DOUBLE_TAP and HOLD events
+        {
+            if (event.action == DOWN)
+            {
+                if (event.pointCount > 1) SetDualInput(event);
+                else
+                {
+                    // Set the press position
+                    initialTapPosition = event.position[0];
+                    
+                    // If too much time have passed, we reset the double tap
+                    if (GetCurrentTime() - eventTime > TAP_TIMEOUT) untap = false;
+                    
+                    // If we are in time, we detect the double tap
+                    if (untap) doubleTapping = true;
+                    
+                    // Update our event time
+                    eventTime = GetCurrentTime();
+                    
+                    // Set hold
+                    currentGesture = GESTURE_HOLD;
+                }
+            }
+            else if (event.action == UP)
+            {
+                // Detect that we are tapping instead of holding
+                if (GetCurrentTime() - eventTime < TAP_TIMEOUT)
+                {
+                    if (doubleTapping)
+                    {
+                        // If we tapped before we define it as double tap
+                        currentGesture = GESTURE_DOUBLETAP;
+                        untap = false;
+                    }
+                    else 
+                    {
+                        // Simple tap
+                        currentGesture = GESTURE_TAP;
+                        untap = true;
+                    }
+                }
+                else currentGesture = GESTURE_NONE;
+                
+                // Tap finished
+                doubleTapping = false;
+                // Update our event time
+                eventTime = GetCurrentTime();
+            }
+            // Begin dragging
+            else if (event.action == MOVE)
+            {
+                if (event.pointCount > 1) SetDualInput(event);
+                else
+                {
+                    // Set the drag starting position
+                    initialDragPosition = initialTapPosition;
+                    endDragPosition = initialDragPosition;
+                    
+                    // Initialize drag
+                    draggingTimeCounter = 0;
+                    gestureType = TYPE_DRAG;
+                    currentGesture = GESTURE_NONE;
+                }
+            }
+        } break;
+        case TYPE_DRAG: // Detect DRAG and SWIPE events 
+        {
+            // end of the drag
+            if (event.action == UP)
+            {
+                // Return Swipe if we have enough sensitivity
+                if (intensity > FORCE_TO_SWIPE)
+                {
+                    if (angle < 30 || angle > 330) currentGesture = GESTURE_SWIPE_RIGHT; // Right
+                    else if (angle > 60 && angle < 120) currentGesture = GESTURE_SWIPE_UP; // Up
+                    else if (angle > 150 && angle < 210) currentGesture = GESTURE_SWIPE_LEFT; // Left
+                    else if (angle > 240 && angle < 300) currentGesture = GESTURE_SWIPE_DOWN; // Down
+                }
+                
+                magnitude = 0;
+                angle = 0;
+                intensity = 0;
+                
+                gestureType = TYPE_MOTIONLESS;
+            }
+            // Update while we are dragging
+            else if (event.action == MOVE)
+            {
+                if (event.pointCount > 1) SetDualInput(event);
+                else
+                {
+                    lastDragPosition = endDragPosition;
+                    
+                    endDragPosition = GetRawPosition();
+                    
+                    //endDragPosition.x = AMotionEvent_getX(event, 0);
+                    //endDragPosition.y = AMotionEvent_getY(event, 0);
+                    
+                    // Calculate attributes
+                    dragVector = (Vector2){ endDragPosition.x - lastDragPosition.x, endDragPosition.y - lastDragPosition.y };
+                    magnitude = sqrt(pow(endDragPosition.x - initialDragPosition.x, 2) + pow(endDragPosition.y - initialDragPosition.y, 2));
+                    angle = CalculateAngle(initialDragPosition, endDragPosition, magnitude);
+                    intensity = magnitude / (float)draggingTimeCounter;
+                    
+                    currentGesture = GESTURE_DRAG;
+                    draggingTimeCounter++;
+                }
+            }
+        } break;
+        case TYPE_DUAL_INPUT:
+        {
+            if (event.action == UP)
+            {
+                if (event.pointCount == 1)
+                {
+                    // Set the drag starting position
+                    initialTapPosition = event.position[0];
+                }
+                gestureType = TYPE_MOTIONLESS;
+            }
+            else if (event.action == MOVE)
+            {
+                // Adapt the ending position of the inputs
+                firstEndPinchPosition = event.position[0];
+                secondEndPinchPosition = event.position[1];
+                
+                // If there is no more than two inputs
+                if (event.pointCount == 2)
+                {
+                    // Detect pinch delta
+                    pinchDelta = OnPinch();
+                    
+                    // Pinch gesture resolution
+                    if (pinchDelta != 0)
+                    {
+                        if (pinchDelta > 0) currentGesture = GESTURE_PINCH_IN;
+                        else currentGesture = GESTURE_PINCH_OUT;
+                    }
+                }
+                else
+                {
+                    // Set the drag starting position
+                    initialTapPosition = event.position[0];
+                    
+                    gestureType = TYPE_MOTIONLESS;
+                }
+                
+                // Readapt the initial position of the inputs
+                firstInitialPinchPosition = firstEndPinchPosition;
+                secondInitialPinchPosition = secondEndPinchPosition;
+            }
+        } break;
+    }
+    //--------------------------------------------------------------------
+}
+
+
+static float CalculateAngle(Vector2 initialPosition, Vector2 actualPosition, float magnitude)
+{
+    float angle;
+    
+    // Calculate arcsinus of the movement ( Our sinus is (actualPosition.y - initialPosition.y) / magnitude)
+    angle = asin((actualPosition.y - initialPosition.y) / magnitude);
+    angle *= RAD2DEG;
+    
+    // Calculate angle depending on the sector
+    if (actualPosition.x - initialPosition.x >= 0)
+    {
+        // Sector 4
+        if (actualPosition.y - initialPosition.y >= 0)
+        {
+            angle *= -1;
+            angle += 360;
+        }
+        // Sector 1
+        else
+        {
+            angle *= -1;
+        }
+    }
+    else
+    {
+        // Sector 3
+        if (actualPosition.y - initialPosition.y >= 0)
+        {
+            angle += 180;
+        }
+        // Sector 2
+        else
+        {
+            angle *= -1;
+            angle = 180 - angle;
+        }
+    }
+    
+    return angle;
+}
+
+static float OnPinch()
+{
+    // Calculate distances
+    float initialDistance = Distance(firstInitialPinchPosition, secondInitialPinchPosition);
+    float endDistance = Distance(firstEndPinchPosition, secondEndPinchPosition);
+    
+    // Calculate Vectors
+    Vector2 firstTouchVector = { firstEndPinchPosition.x - firstInitialPinchPosition.x, firstEndPinchPosition.y - firstInitialPinchPosition.y };
+    Vector2 secondTouchVector = { secondEndPinchPosition.x - secondInitialPinchPosition.x, secondEndPinchPosition.y - secondInitialPinchPosition.y };
+    
+    // Detect the pinch gesture
+    // Calculate Distances
+    if (DotProduct(firstTouchVector, secondTouchVector) < -0.5) return initialDistance - endDistance;
+    else return 0;
+}
+
+static void SetDualInput(GestureEvent event)
+{
+    initialDragPosition = (Vector2){ 0, 0 };
+    endDragPosition = (Vector2){ 0, 0 };
+    lastDragPosition = (Vector2){ 0, 0 };
+
+    // Initialize positions
+    firstInitialPinchPosition = event.position[0];
+    secondInitialPinchPosition = event.position[1];
+    
+    firstEndPinchPosition = firstInitialPinchPosition;
+    secondEndPinchPosition = secondInitialPinchPosition;
+    
+    // Resets
+    magnitude = 0;
+    angle = 0;
+    intensity = 0;
+
+    gestureType = TYPE_DUAL_INPUT;
+}
+
+static float Distance(Vector2 v1, Vector2 v2)
+{
+    float result;
+
+    float dx = v2.x - v1.x;
+    float dy = v2.y - v1.y;
+
+    result = sqrt(dx*dx + dy*dy);
+
+    return result;
+}
+
+static float DotProduct(Vector2 v1, Vector2 v2)
+{
+    float result;
+
+    float v1Module = sqrt(v1.x*v1.x + v1.y*v1.y);
+    float v2Module = sqrt(v2.x*v2.x + v2.y*v2.y);
+    
+    Vector2 v1Normalized = { v1.x / v1Module, v1.y / v1Module };
+    Vector2 v2Normalized = { v2.x / v2Module, v2.y / v2Module };
+    
+    result = v1Normalized.x*v2Normalized.x + v1Normalized.y*v2Normalized.y;
+
+    return result;
+}
+
+static int GetCurrentTime()
+{
+    struct timespec now;
+    clock_gettime(CLOCK_MONOTONIC, &now);
+    uint64_t nowTime = (uint64_t)now.tv_sec*1000000000LLU + (uint64_t)now.tv_nsec;     // Time provided in nanoseconds
+    
+    return nowTime / 1000000; // Return time in miliseconds
+}
+
+#if defined(PLATFORM_ANDROID)
+// Android: Process activity input events
+static int32_t AndroidInputCallback(struct android_app *app, AInputEvent *event)
+{
+    int type = AInputEvent_getType(event);
+    //int32_t key = 0;
+
+    if (type == AINPUT_EVENT_TYPE_MOTION)
+    {
+        touchX = AMotionEvent_getX(event, 0);
+        touchY = AMotionEvent_getY(event, 0);
+    }
+    else if (type == AINPUT_EVENT_TYPE_KEY)
+    {
+        //key = AKeyEvent_getKeyCode(event);
+        //int32_t AKeyEvent_getMetaState(event);
+    }
+    
+    int32_t action = AMotionEvent_getAction(event);
+    unsigned int flags = action & AMOTION_EVENT_ACTION_MASK;
+    
+  
+    GestureEvent gestureEvent;
+    
+    // Action
+    if (flags == AMOTION_EVENT_ACTION_DOWN) gestureEvent.action = DOWN;
+    else if (flags == AMOTION_EVENT_ACTION_UP) gestureEvent.action = UP;
+    else if (flags == AMOTION_EVENT_ACTION_MOVE) gestureEvent.action = MOVE;
+    
+    // Points
+    gestureEvent.pointCount = AMotionEvent_getPointerCount(event);
+    
+    // Position
+    gestureEvent.position[0] = (Vector2){ AMotionEvent_getX(event, 0), AMotionEvent_getY(event, 0) };
+    gestureEvent.position[1] = (Vector2){ AMotionEvent_getX(event, 1), AMotionEvent_getY(event, 1) };
+    
+    ProcessMotionEvent(gestureEvent);
+
+    return 0;
+}
+#endif
+
+#if defined(PLATFORM_WEB)
+static EM_BOOL EmscriptenInputCallback(int eventType, const EmscriptenTouchEvent *touchEvent, void *userData)
+{
+    /*
+    for (int i = 0; i < touchEvent->numTouches; i++)
+    {
+        long x, y, id;
+
+        if (!touchEvent->touches[i].isChanged) continue;
+
+        id = touchEvent->touches[i].identifier;
+        x = touchEvent->touches[i].canvasX;
+        y = touchEvent->touches[i].canvasY;
+    }
+    
+    printf("%s, numTouches: %d %s%s%s%s\n", emscripten_event_type_to_string(eventType), event->numTouches,
+           event->ctrlKey ? " CTRL" : "", event->shiftKey ? " SHIFT" : "", event->altKey ? " ALT" : "", event->metaKey ? " META" : "");
+
+    for(int i = 0; i < event->numTouches; ++i)
+    {
+        const EmscriptenTouchPoint *t = &event->touches[i];
+        
+        printf("  %ld: screen: (%ld,%ld), client: (%ld,%ld), page: (%ld,%ld), isChanged: %d, onTarget: %d, canvas: (%ld, %ld)\n",
+          t->identifier, t->screenX, t->screenY, t->clientX, t->clientY, t->pageX, t->pageY, t->isChanged, t->onTarget, t->canvasX, t->canvasY);
+    }
+    */
+    
+    GestureEvent gestureEvent;
+    
+    // Action
+    if (eventType == EMSCRIPTEN_EVENT_TOUCHSTART) gestureEvent.action = DOWN;
+    else if (eventType == EMSCRIPTEN_EVENT_TOUCHEND) gestureEvent.action = UP;
+    else if (eventType == EMSCRIPTEN_EVENT_TOUCHMOVE) gestureEvent.action = MOVE;
+    
+    // Points
+    gestureEvent.pointCount = event->numTouches;
+    
+    // Position
+    gestureEvent.position[0] = (Vector2){ touchEvent->touches[0].canvasX, touchEvent->touches[0].canvasY };
+    gestureEvent.position[1] = (Vector2){ touchEvent->touches[1].canvasX, touchEvent->touches[1].canvasY };
+    
+    
+    ProcessMotionEvent(gestureEvent);
+
+    return 1;
+}
+#endif
+
+
+
+
+
+

src/raylib.h

@@ -183,6 +183,20 @@
 typedef enum { false, true } bool;
 #endif
 
+typedef enum {
+    GESTURE_NONE = 0,
+    GESTURE_TAP,
+    GESTURE_DOUBLETAP,
+    GESTURE_HOLD,
+    GESTURE_DRAG,
+    GESTURE_SWIPE_RIGHT,
+    GESTURE_SWIPE_LEFT,
+    GESTURE_SWIPE_UP,
+    GESTURE_SWIPE_DOWN,
+    GESTURE_PINCH_IN,
+    GESTURE_PINCH_OUT
+} Gestures;
+
 // byte type
 typedef unsigned char byte;
 
@@ -433,10 +447,18 @@ bool IsGamepadButtonUp(int gamepad, int button);        // Detect if a gamepad b
 #endif
 
 #if defined(PLATFORM_ANDROID)
-bool IsScreenTouched(void);                             // Detect screen touch event
 int GetTouchX(void);                                    // Returns touch position X
 int GetTouchY(void);                                    // Returns touch position Y
 Vector2 GetTouchPosition(void);                         // Returns touch position XY
+
+bool IsGestureDetected(void);
+int GetGestureType(void);
+float GetDragIntensity(void);
+float GetDragAngle(void);
+Vector2 GetDragVector(void);
+int GetHoldDuration(void);                              // Hold time in frames
+float GetPinchDelta(void);
+float GetPinchAngle(void);
 #endif
 
 //------------------------------------------------------------------------------------