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Redesigned gestures module to header-only

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raysan5 2016-08-06 16:32:46 +02:00
parent d5f5f0a930
commit 3b80e2c1e0
6 changed files with 458 additions and 494 deletions
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6
src/Makefile
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@ -168,7 +168,7 @@ endif
# compile all modules with their prerequisites
# compile core module
core.o : core.c raylib.h rlgl.h utils.h raymath.h
core.o : core.c raylib.h rlgl.h utils.h raymath.h gestures.h
$(CC) -c $< $(CFLAGS) $(INCLUDES) -D$(PLATFORM)
# compile rlgl module
@ -207,10 +207,6 @@ utils.o : utils.c utils.h
camera.o : camera.c raylib.h
$(CC) -c $< $(CFLAGS) $(INCLUDES)
#compile gestures module
gestures.o : gestures.c raylib.h
$(CC) -c $< $(CFLAGS) $(INCLUDES)
# It installs generated and needed files to compile projects using raylib.
# The installation works manually.
# TODO: add other platforms.

16
src/core.c
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@ -39,13 +39,15 @@
#include "raylib.h" // raylib main header
#include "rlgl.h" // raylib OpenGL abstraction layer to OpenGL 1.1, 3.3+ or ES2
#include "utils.h" // TraceLog() function
// NOTE: Includes Android fopen map, InitAssetManager()
#include "utils.h" // Includes Android fopen map, InitAssetManager(), TraceLog()
#define RAYMATH_IMPLEMENTATION // Use raymath as a header-only library (includes implementation)
#define RAYMATH_EXTERN_INLINE // Compile raymath functions as static inline (remember, it's a compiler hint)
#include "raymath.h" // Required for Vector3 and Matrix functions
#define GESTURES_IMPLEMENTATION
#include "gestures.h" // Gestures detection functionality
#include <stdio.h> // Standard input / output lib
#include <stdlib.h> // Declares malloc() and free() for memory management, rand(), atexit()
#include <stdint.h> // Required for typedef unsigned long long int uint64_t, used by hi-res timer
@ -234,6 +236,9 @@ static bool showLogo = false; // Track if showing logo at init is
extern void LoadDefaultFont(void); // [Module: text] Loads default font on InitWindow()
extern void UnloadDefaultFont(void); // [Module: text] Unloads default font from GPU memory
extern void ProcessGestureEvent(GestureEvent event); // [Module: gestures] Process gesture event and translate it into gestures
extern void UpdateGestures(void); // [Module: gestures] Update gestures detected (called in PollInputEvents())
//----------------------------------------------------------------------------------
// Module specific Functions Declaration
//----------------------------------------------------------------------------------
@ -2052,10 +2057,7 @@ static void KeyCallback(GLFWwindow *window, int key, int scancode, int action, i
// NOTE: Before closing window, while loop must be left!
}
#if defined(PLATFORM_DESKTOP)
else if (key == GLFW_KEY_F12 && action == GLFW_PRESS)
{
TakeScreenshot();
}
else if (key == GLFW_KEY_F12 && action == GLFW_PRESS) TakeScreenshot();
#endif
else
{

423
src/gestures.c
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@ -1,423 +0,0 @@
/**********************************************************************************************
*
* raylib Gestures System - Gestures Processing based on input gesture events (touch/mouse)
*
* Initial design by Marc Palau
* Redesigned by Albert Martos and Ian Eito
* Reviewed by 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.
*
**********************************************************************************************/
//#define GESTURES_STANDALONE // NOTE: To use the gestures module as standalone lib, just uncomment this line
#if defined(GESTURES_STANDALONE)
#include "gestures.h"
#else
#include "raylib.h" // Required for: Vector2, Gestures
#endif
#include <math.h> // Required for: atan2(), sqrt()
#include <stdint.h> // Required for: uint64_t
#if defined(_WIN32)
// Functions required to query time on Windows
int __stdcall QueryPerformanceCounter(unsigned long long int *lpPerformanceCount);
int __stdcall QueryPerformanceFrequency(unsigned long long int *lpFrequency);
#elif defined(__linux)
#include <sys/time.h> // Required for: timespec
#include <time.h> // Required for: clock_gettime()
#endif
//----------------------------------------------------------------------------------
// Defines and Macros
//----------------------------------------------------------------------------------
#define FORCE_TO_SWIPE 0.0005f // Measured in normalized screen units/time
#define MINIMUM_DRAG 0.015f // Measured in normalized screen units (0.0f to 1.0f)
#define MINIMUM_PINCH 0.005f // Measured in normalized screen units (0.0f to 1.0f)
#define TAP_TIMEOUT 300 // Time in milliseconds
#define PINCH_TIMEOUT 300 // Time in milliseconds
#define DOUBLETAP_RANGE 0.03f // Measured in normalized screen units (0.0f to 1.0f)
//----------------------------------------------------------------------------------
// Types and Structures Definition
//----------------------------------------------------------------------------------
// ...
//----------------------------------------------------------------------------------
// Global Variables Definition
//----------------------------------------------------------------------------------
// Touch gesture variables
static Vector2 touchDownPosition = { 0.0f, 0.0f };
static Vector2 touchDownPosition2 = { 0.0f, 0.0f };
static Vector2 touchDownDragPosition = { 0.0f, 0.0f };
static Vector2 touchUpPosition = { 0.0f, 0.0f };
static Vector2 moveDownPosition = { 0.0f, 0.0f };
static Vector2 moveDownPosition2 = { 0.0f, 0.0f };
static int numTap = 0;
static int pointCount = 0;
static int firstTouchId = -1;
static double eventTime = 0.0;
static double swipeTime = 0.0;
// Hold gesture variables
static int numHold = 0;
static float timeHold = 0.0f;
// Drag gesture variables
static Vector2 dragVector = { 0.0f , 0.0f }; // DRAG vector (between initial and current position)
static float dragAngle = 0.0f; // DRAG angle (relative to x-axis)
static float dragDistance = 0.0f; // DRAG distance (from initial touch point to final) (normalized [0..1])
static float dragIntensity = 0.0f; // DRAG intensity, how far why did the DRAG (pixels per frame)
static bool startMoving = false; // SWIPE used to define when start measuring swipeTime
// Pinch gesture variables
static Vector2 pinchVector = { 0.0f , 0.0f }; // PINCH vector (between first and second touch points)
static float pinchAngle = 0.0f; // PINCH angle (relative to x-axis)
static float pinchDistance = 0.0f; // PINCH displacement distance (normalized [0..1])
// Detected gestures
static int previousGesture = GESTURE_NONE;
static int currentGesture = GESTURE_NONE;
// Enabled gestures flags, all gestures enabled by default
static unsigned int enabledGestures = 0b0000001111111111;
//----------------------------------------------------------------------------------
// Module specific Functions Declaration
//----------------------------------------------------------------------------------
static float Vector2Angle(Vector2 initialPosition, Vector2 finalPosition);
static float Vector2Distance(Vector2 v1, Vector2 v2);
static double GetCurrentTime(void);
//----------------------------------------------------------------------------------
// Module Functions Definition
//----------------------------------------------------------------------------------
// Enable only desired getures to be detected
void SetGesturesEnabled(unsigned int gestureFlags)
{
enabledGestures = gestureFlags;
}
// Check if a gesture have been detected
bool IsGestureDetected(int gesture)
{
if ((enabledGestures & currentGesture) == gesture) return true;
else return false;
}
// Process gesture event and translate it into gestures
void ProcessGestureEvent(GestureEvent event)
{
// Reset required variables
previousGesture = currentGesture;
pointCount = event.pointCount; // Required on UpdateGestures()
if (pointCount < 2)
{
if (event.touchAction == TOUCH_DOWN)
{
numTap++; // Tap counter
// Detect GESTURE_DOUBLE_TAP
if ((currentGesture == GESTURE_NONE) && (numTap >= 2) && ((GetCurrentTime() - eventTime) < TAP_TIMEOUT) && (Vector2Distance(touchDownPosition, event.position[0]) < DOUBLETAP_RANGE))
{
currentGesture = GESTURE_DOUBLETAP;
numTap = 0;
}
else // Detect GESTURE_TAP
{
numTap = 1;
currentGesture = GESTURE_TAP;
}
touchDownPosition = event.position[0];
touchDownDragPosition = event.position[0];
touchUpPosition = touchDownPosition;
eventTime = GetCurrentTime();
firstTouchId = event.pointerId[0];
dragVector = (Vector2){ 0.0f, 0.0f };
}
else if (event.touchAction == TOUCH_UP)
{
if (currentGesture == GESTURE_DRAG) touchUpPosition = event.position[0];
// NOTE: dragIntensity dependend on the resolution of the screen
dragDistance = Vector2Distance(touchDownPosition, touchUpPosition);
dragIntensity = dragDistance/(float)((GetCurrentTime() - swipeTime));
startMoving = false;
// Detect GESTURE_SWIPE
if ((dragIntensity > FORCE_TO_SWIPE) && firstTouchId == event.pointerId[0])
{
// NOTE: Angle should be inverted in Y
dragAngle = 360.0f - Vector2Angle(touchDownPosition, touchUpPosition);
if ((dragAngle < 30) || (dragAngle > 330)) currentGesture = GESTURE_SWIPE_RIGHT; // Right
else if ((dragAngle > 30) && (dragAngle < 120)) currentGesture = GESTURE_SWIPE_UP; // Up
else if ((dragAngle > 120) && (dragAngle < 210)) currentGesture = GESTURE_SWIPE_LEFT; // Left
else if ((dragAngle > 210) && (dragAngle < 300)) currentGesture = GESTURE_SWIPE_DOWN; // Down
else currentGesture = GESTURE_NONE;
}
else
{
dragDistance = 0.0f;
dragIntensity = 0.0f;
dragAngle = 0.0f;
currentGesture = GESTURE_NONE;
}
touchDownDragPosition = (Vector2){ 0.0f, 0.0f };
pointCount = 0;
}
else if (event.touchAction == TOUCH_MOVE)
{
if (currentGesture == GESTURE_DRAG) eventTime = GetCurrentTime();
if (!startMoving)
{
swipeTime = GetCurrentTime();
startMoving = true;
}
moveDownPosition = event.position[0];
if (currentGesture == GESTURE_HOLD)
{
if (numHold == 1) touchDownPosition = event.position[0];
numHold = 2;
// Detect GESTURE_DRAG
if (Vector2Distance(touchDownPosition, moveDownPosition) >= MINIMUM_DRAG)
{
eventTime = GetCurrentTime();
currentGesture = GESTURE_DRAG;
}
}
dragVector.x = moveDownPosition.x - touchDownDragPosition.x;
dragVector.y = moveDownPosition.y - touchDownDragPosition.y;
}
}
else // Two touch points
{
if (event.touchAction == TOUCH_DOWN)
{
touchDownPosition = event.position[0];
touchDownPosition2 = event.position[1];
//pinchDistance = Vector2Distance(touchDownPosition, touchDownPosition2);
pinchVector.x = touchDownPosition2.x - touchDownPosition.x;
pinchVector.y = touchDownPosition2.y - touchDownPosition.y;
currentGesture = GESTURE_HOLD;
timeHold = GetCurrentTime();
}
else if (event.touchAction == TOUCH_MOVE)
{
pinchDistance = Vector2Distance(moveDownPosition, moveDownPosition2);
touchDownPosition = moveDownPosition;
touchDownPosition2 = moveDownPosition2;
moveDownPosition = event.position[0];
moveDownPosition2 = event.position[1];
pinchVector.x = moveDownPosition2.x - moveDownPosition.x;
pinchVector.y = moveDownPosition2.y - moveDownPosition.y;
if ((Vector2Distance(touchDownPosition, moveDownPosition) >= MINIMUM_PINCH) || (Vector2Distance(touchDownPosition2, moveDownPosition2) >= MINIMUM_PINCH))
{
if ((Vector2Distance(moveDownPosition, moveDownPosition2) - pinchDistance) < 0) currentGesture = GESTURE_PINCH_IN;
else currentGesture = GESTURE_PINCH_OUT;
}
else
{
currentGesture = GESTURE_HOLD;
timeHold = GetCurrentTime();
}
// NOTE: Angle should be inverted in Y
pinchAngle = 360.0f - Vector2Angle(moveDownPosition, moveDownPosition2);
}
else if (event.touchAction == TOUCH_UP)
{
pinchDistance = 0.0f;
pinchAngle = 0.0f;
pinchVector = (Vector2){ 0.0f, 0.0f };
pointCount = 0;
currentGesture = GESTURE_NONE;
}
}
}
// 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 (((currentGesture == GESTURE_TAP) || (currentGesture == GESTURE_DOUBLETAP)) && (pointCount < 2))
{
currentGesture = GESTURE_HOLD;
timeHold = GetCurrentTime();
}
if (((GetCurrentTime() - eventTime) > TAP_TIMEOUT) && (currentGesture == GESTURE_DRAG) && (pointCount < 2))
{
currentGesture = GESTURE_HOLD;
timeHold = GetCurrentTime();
numHold = 1;
}
// Detect GESTURE_NONE
if ((currentGesture == GESTURE_SWIPE_RIGHT) || (currentGesture == GESTURE_SWIPE_UP) || (currentGesture == GESTURE_SWIPE_LEFT) || (currentGesture == GESTURE_SWIPE_DOWN))
{
currentGesture = GESTURE_NONE;
}
}
// Get number of touch points
int GetTouchPointsCount(void)
{
// NOTE: point count is calculated when ProcessGestureEvent(GestureEvent event) is called
return pointCount;
}
// Get latest detected gesture
int GetGestureDetected(void)
{
// Get current gesture only if enabled
return (enabledGestures & currentGesture);
}
// Hold time measured in ms
float GetGestureHoldDuration(void)
{
// NOTE: time is calculated on current gesture HOLD
float time = 0.0f;
if (currentGesture == GESTURE_HOLD) time = (float)GetCurrentTime() - timeHold;
return time;
}
// Get drag vector (between initial touch point to current)
Vector2 GetGestureDragVector(void)
{
// NOTE: drag vector is calculated on one touch points TOUCH_MOVE
return dragVector;
}
// 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_UP
return dragAngle;
}
// Get distance between two pinch points
Vector2 GetGesturePinchVector(void)
{
// NOTE: The position values used for pinchDistance are not modified like the position values of [core.c]-->GetTouchPosition(int index)
// NOTE: pinch distance is calculated on two touch points TOUCH_MOVE
return pinchVector;
}
// 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_MOVE
return pinchAngle;
}
//----------------------------------------------------------------------------------
// Module specific Functions Definition
//----------------------------------------------------------------------------------
// Returns angle from two-points vector with X-axis
static float Vector2Angle(Vector2 initialPosition, Vector2 finalPosition)
{
float angle;
angle = atan2(finalPosition.y - initialPosition.y, finalPosition.x - initialPosition.x);
angle *= RAD2DEG;
if (angle < 0) angle += 360.0f;
return angle;
}
// Calculate distance between two Vector2
static float Vector2Distance(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;
}
// Time measure returned are milliseconds
static double GetCurrentTime(void)
{
double time = 0;
#if defined(_WIN32)
unsigned long long int clockFrequency, currentTime;
QueryPerformanceFrequency(&clockFrequency);
QueryPerformanceCounter(&currentTime);
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);
uint64_t nowTime = (uint64_t)now.tv_sec*1000000000LLU + (uint64_t)now.tv_nsec; // Time in nanoseconds
time = ((double)nowTime/1000000.0); // Time in miliseconds
#endif
return time;
}

480
src/gestures.h
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@ -1,8 +1,21 @@
/**********************************************************************************************
*
* raylib Gestures System - Gestures Detection and Usage Functions (Android and HTML5)
* raylib Gestures System - Gestures Processing based on input gesture events (touch/mouse)
*
* Copyright (c) 2015 Marc Palau and Ramon Santamaria
* #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.
*
* NOTE: Memory footprint of this library is aproximately 128 bytes
*
* Initial design by Marc Palau
* Redesigned by Albert Martos and Ian Eito
* Reviewed by 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.
@ -28,9 +41,6 @@
#define PI 3.14159265358979323846
#endif
#define DEG2RAD (PI / 180.0f)
#define RAD2DEG (180.0f / PI)
//----------------------------------------------------------------------------------
// Defines and Macros
//----------------------------------------------------------------------------------
@ -40,33 +50,35 @@
// Types and Structures Definition
// NOTE: Below types are required for GESTURES_STANDALONE usage
//----------------------------------------------------------------------------------
#ifndef __cplusplus
// Boolean type
typedef enum { false, true } bool;
#if defined(GESTURES_STANDALONE)
#ifndef __cplusplus
// Boolean type
typedef enum { false, true } bool;
#endif
// Vector2 type
typedef struct Vector2 {
float x;
float y;
} Vector2;
// Gestures type
// NOTE: It could be used as flags to enable only some gestures
typedef enum {
GESTURE_NONE = 1,
GESTURE_TAP = 2,
GESTURE_DOUBLETAP = 4,
GESTURE_HOLD = 8,
GESTURE_DRAG = 16,
GESTURE_SWIPE_RIGHT = 32,
GESTURE_SWIPE_LEFT = 64,
GESTURE_SWIPE_UP = 128,
GESTURE_SWIPE_DOWN = 256,
GESTURE_PINCH_IN = 512,
GESTURE_PINCH_OUT = 1024
} Gestures;
#endif
// Vector2 type
typedef struct Vector2 {
float x;
float y;
} Vector2;
// Gestures type
// NOTE: It could be used as flags to enable only some gestures
typedef enum {
GESTURE_NONE = 1,
GESTURE_TAP = 2,
GESTURE_DOUBLETAP = 4,
GESTURE_HOLD = 8,
GESTURE_DRAG = 16,
GESTURE_SWIPE_RIGHT = 32,
GESTURE_SWIPE_LEFT = 64,
GESTURE_SWIPE_UP = 128,
GESTURE_SWIPE_DOWN = 256,
GESTURE_PINCH_IN = 512,
GESTURE_PINCH_OUT = 1024
} Gestures;
typedef enum { TOUCH_UP, TOUCH_DOWN, TOUCH_MOVE } TouchAction;
// Gesture events
@ -90,22 +102,422 @@ extern "C" { // Prevents name mangling of functions
//----------------------------------------------------------------------------------
// Module Functions Declaration
//----------------------------------------------------------------------------------
void SetGesturesEnabled(unsigned int gestureFlags); // Enable a set of gestures using flags
bool IsGestureDetected(int gesture); // Check if a gesture have been detected
void ProcessGestureEvent(GestureEvent event); // Process gesture event and translate it into gestures
void UpdateGestures(void); // Update gestures detected (must be called every frame)
int GetTouchPointsCount(void); // Get touch points count
#if defined(GESTURES_STANDALONE)
void SetGesturesEnabled(unsigned int gestureFlags); // 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
int GetTouchPointsCount(void); // Get touch points count
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
#ifdef __cplusplus
}
#endif
#endif // GESTURES_H
/***********************************************************************************
*
* GESTURES IMPLEMENTATION
*
************************************************************************************/
#if defined(GESTURES_IMPLEMENTATION)
#include <math.h> // Required for: atan2(), sqrt()
#include <stdint.h> // Required for: uint64_t
#if defined(_WIN32)
// Functions required to query time on Windows
int __stdcall QueryPerformanceCounter(unsigned long long int *lpPerformanceCount);
int __stdcall QueryPerformanceFrequency(unsigned long long int *lpFrequency);
#elif defined(__linux)
#include <sys/time.h> // Required for: timespec
#include <time.h> // Required for: clock_gettime()
#endif
//----------------------------------------------------------------------------------
// Defines and Macros
//----------------------------------------------------------------------------------
#define FORCE_TO_SWIPE 0.0005f // Measured in normalized screen units/time
#define MINIMUM_DRAG 0.015f // Measured in normalized screen units (0.0f to 1.0f)
#define MINIMUM_PINCH 0.005f // Measured in normalized screen units (0.0f to 1.0f)
#define TAP_TIMEOUT 300 // Time in milliseconds
#define PINCH_TIMEOUT 300 // Time in milliseconds
#define DOUBLETAP_RANGE 0.03f // Measured in normalized screen units (0.0f to 1.0f)
//----------------------------------------------------------------------------------
// Types and Structures Definition
//----------------------------------------------------------------------------------
// ...
//----------------------------------------------------------------------------------
// Global Variables Definition
//----------------------------------------------------------------------------------
// Touch gesture variables
static Vector2 touchDownPosition = { 0.0f, 0.0f };
static Vector2 touchDownPosition2 = { 0.0f, 0.0f };
static Vector2 touchDownDragPosition = { 0.0f, 0.0f };
static Vector2 touchUpPosition = { 0.0f, 0.0f };
static Vector2 moveDownPosition = { 0.0f, 0.0f };
static Vector2 moveDownPosition2 = { 0.0f, 0.0f };
static int pointCount = 0; // Touch points counter
static int firstTouchId = -1; // Touch id for first touch point
static double eventTime = 0.0; // Time stamp when an event happened
// Tap gesture variables
static int tapCounter = 0; // TAP counter (one tap implies TOUCH_DOWN and TOUCH_UP actions)
// Hold gesture variables
static bool resetHold = false; // HOLD reset to get first touch point again
static float timeHold = 0.0f; // HOLD duration in milliseconds
// Drag gesture variables
static Vector2 dragVector = { 0.0f , 0.0f }; // DRAG vector (between initial and current position)
static float dragAngle = 0.0f; // DRAG angle (relative to x-axis)
static float dragDistance = 0.0f; // DRAG distance (from initial touch point to final) (normalized [0..1])
static float dragIntensity = 0.0f; // DRAG intensity, how far why did the DRAG (pixels per frame)
// Swipe gestures variables
static bool startMoving = false; // SWIPE used to define when start measuring swipeTime
static double swipeTime = 0.0; // SWIPE time to calculate drag intensity
// Pinch gesture variables
static Vector2 pinchVector = { 0.0f , 0.0f }; // PINCH vector (between first and second touch points)
static float pinchAngle = 0.0f; // PINCH angle (relative to x-axis)
static float pinchDistance = 0.0f; // PINCH displacement distance (normalized [0..1])
static int currentGesture = GESTURE_NONE; // Current detected gesture
// Enabled gestures flags, all gestures enabled by default
static unsigned int enabledGestures = 0b0000001111111111;
//----------------------------------------------------------------------------------
// Module specific Functions Declaration
//----------------------------------------------------------------------------------
static float Vector2Angle(Vector2 initialPosition, Vector2 finalPosition);
static float Vector2Distance(Vector2 v1, Vector2 v2);
static double GetCurrentTime(void);
//----------------------------------------------------------------------------------
// Module Functions Definition
//----------------------------------------------------------------------------------
// Enable only desired getures to be detected
void SetGesturesEnabled(unsigned int gestureFlags)
{
enabledGestures = gestureFlags;
}
// Check if a gesture have been detected
bool IsGestureDetected(int gesture)
{
if ((enabledGestures & currentGesture) == gesture) return true;
else return false;
}
// Process gesture event and translate it into gestures
void ProcessGestureEvent(GestureEvent event)
{
// Reset required variables
pointCount = event.pointCount; // Required on UpdateGestures()
if (pointCount < 2)
{
if (event.touchAction == TOUCH_DOWN)
{
tapCounter++; // Tap counter
// Detect GESTURE_DOUBLE_TAP
if ((currentGesture == GESTURE_NONE) && (tapCounter >= 2) && ((GetCurrentTime() - eventTime) < TAP_TIMEOUT) && (Vector2Distance(touchDownPosition, event.position[0]) < DOUBLETAP_RANGE))
{
currentGesture = GESTURE_DOUBLETAP;
tapCounter = 0;
}
else // Detect GESTURE_TAP
{
tapCounter = 1;
currentGesture = GESTURE_TAP;
}
touchDownPosition = event.position[0];
touchDownDragPosition = event.position[0];
touchUpPosition = touchDownPosition;
eventTime = GetCurrentTime();
firstTouchId = event.pointerId[0];
dragVector = (Vector2){ 0.0f, 0.0f };
}
else if (event.touchAction == TOUCH_UP)
{
if (currentGesture == GESTURE_DRAG) touchUpPosition = event.position[0];
// NOTE: dragIntensity dependend on the resolution of the screen
dragDistance = Vector2Distance(touchDownPosition, touchUpPosition);
dragIntensity = dragDistance/(float)((GetCurrentTime() - swipeTime));
startMoving = false;
// Detect GESTURE_SWIPE
if ((dragIntensity > FORCE_TO_SWIPE) && (firstTouchId == event.pointerId[0]))
{
// NOTE: Angle should be inverted in Y
dragAngle = 360.0f - Vector2Angle(touchDownPosition, touchUpPosition);
if ((dragAngle < 30) || (dragAngle > 330)) currentGesture = GESTURE_SWIPE_RIGHT; // Right
else if ((dragAngle > 30) && (dragAngle < 120)) currentGesture = GESTURE_SWIPE_UP; // Up
else if ((dragAngle > 120) && (dragAngle < 210)) currentGesture = GESTURE_SWIPE_LEFT; // Left
else if ((dragAngle > 210) && (dragAngle < 300)) currentGesture = GESTURE_SWIPE_DOWN; // Down
else currentGesture = GESTURE_NONE;
}
else
{
dragDistance = 0.0f;
dragIntensity = 0.0f;
dragAngle = 0.0f;
currentGesture = GESTURE_NONE;
}
touchDownDragPosition = (Vector2){ 0.0f, 0.0f };
pointCount = 0;
}
else if (event.touchAction == TOUCH_MOVE)
{
if (currentGesture == GESTURE_DRAG) eventTime = GetCurrentTime();
if (!startMoving)
{
swipeTime = GetCurrentTime();
startMoving = true;
}
moveDownPosition = event.position[0];
if (currentGesture == GESTURE_HOLD)
{
if (resetHold) touchDownPosition = event.position[0];
resetHold = false;
// Detect GESTURE_DRAG
if (Vector2Distance(touchDownPosition, moveDownPosition) >= MINIMUM_DRAG)
{
eventTime = GetCurrentTime();
currentGesture = GESTURE_DRAG;
}
}
dragVector.x = moveDownPosition.x - touchDownDragPosition.x;
dragVector.y = moveDownPosition.y - touchDownDragPosition.y;
}
}
else // Two touch points
{
if (event.touchAction == TOUCH_DOWN)
{
touchDownPosition = event.position[0];
touchDownPosition2 = event.position[1];
//pinchDistance = Vector2Distance(touchDownPosition, touchDownPosition2);
pinchVector.x = touchDownPosition2.x - touchDownPosition.x;
pinchVector.y = touchDownPosition2.y - touchDownPosition.y;
currentGesture = GESTURE_HOLD;
timeHold = GetCurrentTime();
}
else if (event.touchAction == TOUCH_MOVE)
{
pinchDistance = Vector2Distance(moveDownPosition, moveDownPosition2);
touchDownPosition = moveDownPosition;
touchDownPosition2 = moveDownPosition2;
moveDownPosition = event.position[0];
moveDownPosition2 = event.position[1];
pinchVector.x = moveDownPosition2.x - moveDownPosition.x;
pinchVector.y = moveDownPosition2.y - moveDownPosition.y;
if ((Vector2Distance(touchDownPosition, moveDownPosition) >= MINIMUM_PINCH) || (Vector2Distance(touchDownPosition2, moveDownPosition2) >= MINIMUM_PINCH))
{
if ((Vector2Distance(moveDownPosition, moveDownPosition2) - pinchDistance) < 0) currentGesture = GESTURE_PINCH_IN;
else currentGesture = GESTURE_PINCH_OUT;
}
else
{
currentGesture = GESTURE_HOLD;
timeHold = GetCurrentTime();
}
// NOTE: Angle should be inverted in Y
pinchAngle = 360.0f - Vector2Angle(moveDownPosition, moveDownPosition2);
}
else if (event.touchAction == TOUCH_UP)
{
pinchDistance = 0.0f;
pinchAngle = 0.0f;
pinchVector = (Vector2){ 0.0f, 0.0f };
pointCount = 0;
currentGesture = GESTURE_NONE;
}
}
}
// 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 (((currentGesture == GESTURE_TAP) || (currentGesture == GESTURE_DOUBLETAP)) && (pointCount < 2))
{
currentGesture = GESTURE_HOLD;
timeHold = GetCurrentTime();
}
if (((GetCurrentTime() - eventTime) > TAP_TIMEOUT) && (currentGesture == GESTURE_DRAG) && (pointCount < 2))
{
currentGesture = GESTURE_HOLD;
timeHold = GetCurrentTime();
resetHold = true;
}
// Detect GESTURE_NONE
if ((currentGesture == GESTURE_SWIPE_RIGHT) || (currentGesture == GESTURE_SWIPE_UP) || (currentGesture == GESTURE_SWIPE_LEFT) || (currentGesture == GESTURE_SWIPE_DOWN))
{
currentGesture = GESTURE_NONE;
}
}
// Get number of touch points
int GetTouchPointsCount(void)
{
// NOTE: point count is calculated when ProcessGestureEvent(GestureEvent event) is called
return pointCount;
}
// Get latest detected gesture
int GetGestureDetected(void)
{
// Get current gesture only if enabled
return (enabledGestures & currentGesture);
}
// Hold time measured in ms
float GetGestureHoldDuration(void)
{
// NOTE: time is calculated on current gesture HOLD
float time = 0.0f;
if (currentGesture == GESTURE_HOLD) time = (float)GetCurrentTime() - timeHold;
return time;
}
// Get drag vector (between initial touch point to current)
Vector2 GetGestureDragVector(void)
{
// NOTE: drag vector is calculated on one touch points TOUCH_MOVE
return dragVector;
}
// 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_UP
return dragAngle;
}
// Get distance between two pinch points
Vector2 GetGesturePinchVector(void)
{
// NOTE: The position values used for pinchDistance are not modified like the position values of [core.c]-->GetTouchPosition(int index)
// NOTE: pinch distance is calculated on two touch points TOUCH_MOVE
return pinchVector;
}
// 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_MOVE
return pinchAngle;
}
//----------------------------------------------------------------------------------
// Module specific Functions Definition
//----------------------------------------------------------------------------------
// Returns angle from two-points vector with X-axis
static float Vector2Angle(Vector2 initialPosition, Vector2 finalPosition)
{
float angle;
angle = atan2(finalPosition.y - initialPosition.y, finalPosition.x - initialPosition.x)*(180.0f/PI);
if (angle < 0) angle += 360.0f;
return angle;
}
// Calculate distance between two Vector2
static float Vector2Distance(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;
}
// Time measure returned are milliseconds
static double GetCurrentTime(void)
{
double time = 0;
#if defined(_WIN32)
unsigned long long int clockFrequency, currentTime;
QueryPerformanceFrequency(&clockFrequency);
QueryPerformanceCounter(&currentTime);
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);
uint64_t nowTime = (uint64_t)now.tv_sec*1000000000LLU + (uint64_t)now.tv_nsec; // Time in nanoseconds
time = ((double)nowTime/1000000.0); // Time in miliseconds
#endif
return time;
}
#endif // GESTURES_IMPLEMENTATION

17
src/raylib.h
View File

@ -570,18 +570,6 @@ typedef enum {
GESTURE_PINCH_OUT = 512
} Gestures;
// Touch action (fingers or mouse)
typedef enum { TOUCH_UP, TOUCH_DOWN, TOUCH_MOVE } TouchAction;
// Gesture events
// NOTE: MAX_TOUCH_POINTS fixed to 2
typedef struct GestureEvent {
int touchAction;
int pointCount;
int pointerId[MAX_TOUCH_POINTS];
Vector2 position[MAX_TOUCH_POINTS];
} GestureEvent;
// Camera system modes
typedef enum { CAMERA_CUSTOM = 0, CAMERA_FREE, CAMERA_ORBITAL, CAMERA_FIRST_PERSON, CAMERA_THIRD_PERSON } CameraMode;
@ -711,11 +699,8 @@ bool IsButtonReleased(int button); // Detect if an android
//------------------------------------------------------------------------------------
void SetGesturesEnabled(unsigned int gestureFlags); // Enable a set of gestures using flags
bool IsGestureDetected(int gesture); // Check if a gesture have been detected
void ProcessGestureEvent(GestureEvent event); // Process gesture event and translate it into gestures
void UpdateGestures(void); // Update gestures detected (called automatically in PollInputEvents())
int GetTouchPointsCount(void); // Get touch points count
int GetGestureDetected(void); // Get latest detected gesture
int GetTouchPointsCount(void); // Get touch points count
float GetGestureHoldDuration(void); // Get gesture hold time in milliseconds
Vector2 GetGestureDragVector(void); // Get gesture drag vector
float GetGestureDragAngle(void); // Get gesture drag angle

10
src/rlua.h
View File

@ -1313,12 +1313,6 @@ int lua_IsGestureDetected(lua_State* L)
return 1;
}
int lua_UpdateGestures(lua_State* L)
{
UpdateGestures();
return 0;
}
int lua_GetTouchPointsCount(lua_State* L)
{
int result = GetTouchPointsCount();
@ -3576,10 +3570,8 @@ static luaL_Reg raylib_functions[] = {
REG(SetGesturesEnabled)
REG(IsGestureDetected)
//REG(ProcessGestureEvent)
REG(UpdateGestures)
REG(GetTouchPointsCount)
REG(GetGestureDetected)
REG(GetTouchPointsCount)
REG(GetGestureHoldDuration)
REG(GetGestureDragVector)
REG(GetGestureDragAngle)