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Reviewing gestures module (IN PROGRESS)

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Ray 2016-02-03 19:29:59 +01:00
parent 2ef9552454
commit e98ea900cf
1 changed files with 58 additions and 41 deletions
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src/gestures.c
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@ -1,8 +1,10 @@
/********************************************************************************************** /**********************************************************************************************
* *
* 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 * Reviewed by Ramon Santamaria
* Redesigned by Albert Martos and Ian Eito
* Initial design by Marc Palau
* *
* This software is provided "as-is", without any express or implied warranty. In no event * 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. * will the authors be held liable for any damages arising from the use of this software.
@ -56,18 +58,14 @@
//---------------------------------------------------------------------------------- //----------------------------------------------------------------------------------
// Types and Structures Definition // Types and Structures Definition
//---------------------------------------------------------------------------------- //----------------------------------------------------------------------------------
typedef enum { // ...
TYPE_MOTIONLESS,
TYPE_DRAG,
TYPE_DUAL_INPUT
} GestureType;
//---------------------------------------------------------------------------------- //----------------------------------------------------------------------------------
// Global Variables Definition // Global Variables Definition
//---------------------------------------------------------------------------------- //----------------------------------------------------------------------------------
// Drag gesture variables // Drag gesture variables
static Vector2 dragVector = { 0, 0 }; static Vector2 dragVector = { 0.0f , 0.0f };
// Touch gesture variables // Touch gesture variables
static Vector2 touchDownPosition = { 0, 0 }; static Vector2 touchDownPosition = { 0, 0 };
@ -81,15 +79,15 @@ static int numHold = 0;
static int pointCount = 0; static int pointCount = 0;
static int touchId = -1; static int touchId = -1;
static double eventTime = 0; static double eventTime = 0.0;
static float magnitude = 0; // Distance traveled dragging static float dragDistance = 0.0f; // DRAG distance (from initial touch point to current)
static float angle = 0; // Angle direction of the drag static float dragAngle = 0; // DRAG angle direction
static float intensity = 0; // How fast we did the drag (pixels per frame) static float dragIntensity = 0; // DRAG intensity, how far why did the DRAG (pixels per frame)
static int draggingTimeCounter = 0; // Time that have passed while dragging static int draggingTimeCounter = 0; // DRAG time // RAY: WTF!!! Counting... frames???
// Pinch gesture variables // Pinch gesture variables
static float pinchDelta = 0; // Pinch delta displacement static float pinchDistance = 0.0f; // Pinch displacement distance // RAY: Not used! o__O
// Detected gestures // Detected gestures
static int previousGesture = GESTURE_NONE; static int previousGesture = GESTURE_NONE;
@ -112,9 +110,9 @@ static double GetCurrentTime();
// Process gesture event and translate it into gestures // Process gesture event and translate it into gestures
void ProcessGestureEvent(GestureEvent event) void ProcessGestureEvent(GestureEvent event)
{ {
// Resets // Reset required variables
dragVector = (Vector2){ 0, 0 }; dragVector = (Vector2){ 0.0f, 0.0f }; // RAY: Not used???
pinchDelta = 0; pinchDistance = 0.0f;
previousGesture = currentGesture; previousGesture = currentGesture;
@ -150,25 +148,25 @@ void ProcessGestureEvent(GestureEvent event)
if (currentGesture == GESTURE_DRAG) touchUpPosition = event.position[0]; if (currentGesture == GESTURE_DRAG) touchUpPosition = event.position[0];
// Calculate for swipe // Calculate for swipe
magnitude = Vector2Distance(touchDownPosition, touchUpPosition); dragDistance = Vector2Distance(touchDownPosition, touchUpPosition);
intensity = magnitude / (float)draggingTimeCounter; dragIntensity = dragDistance/(float)draggingTimeCounter; // RAY: WTF!!! Counting frames???
// Detect GESTURE_SWIPE // Detect GESTURE_SWIPE
if ((intensity > FORCE_TO_SWIPE) && (touchId == 0)) if ((dragIntensity > FORCE_TO_SWIPE) && (touchId == 0)) // RAY: why check (touchId == 0)???
{ {
angle = CalculateAngle(touchDownPosition, touchUpPosition, magnitude); dragAngle = CalculateAngle(touchDownPosition, touchUpPosition, dragDistance);
if ((angle < 30) || (angle > 330)) currentGesture = GESTURE_SWIPE_RIGHT; // Right if ((dragAngle < 30) || (dragAngle > 330)) currentGesture = GESTURE_SWIPE_RIGHT; // Right
else if ((angle > 30) && (angle < 120)) currentGesture = GESTURE_SWIPE_UP; // Up else if ((dragAngle > 30) && (dragAngle < 120)) currentGesture = GESTURE_SWIPE_UP; // Up
else if ((angle > 120) && (angle < 210)) currentGesture = GESTURE_SWIPE_LEFT; // Left else if ((dragAngle > 120) && (dragAngle < 210)) currentGesture = GESTURE_SWIPE_LEFT; // Left
else if ((angle > 210) && (angle < 300)) currentGesture = GESTURE_SWIPE_DOWN; // Down else if ((dragAngle > 210) && (dragAngle < 300)) currentGesture = GESTURE_SWIPE_DOWN; // Down
else currentGesture = GESTURE_NONE; else currentGesture = GESTURE_NONE;
} }
else else
{ {
magnitude = 0; dragDistance = 0.0f;
angle = 0; dragIntensity = 0.0f;
intensity = 0; dragAngle = 0.0f;
currentGesture = GESTURE_NONE; currentGesture = GESTURE_NONE;
} }
@ -187,13 +185,13 @@ void ProcessGestureEvent(GestureEvent event)
numHold = 2; numHold = 2;
magnitude = Vector2Distance(touchDownPosition, moveDownPosition); dragDistance = Vector2Distance(touchDownPosition, moveDownPosition);
// Detect GESTURE_DRAG // Detect GESTURE_DRAG
if (magnitude >= FORCE_TO_DRAG) currentGesture = GESTURE_DRAG; if (dragDistance >= FORCE_TO_DRAG) currentGesture = GESTURE_DRAG;
} }
draggingTimeCounter++; draggingTimeCounter++; // RAY: What do you count??? Move event actions?
} }
} }
else // Two touch points else // Two touch points
@ -207,7 +205,7 @@ void ProcessGestureEvent(GestureEvent event)
} }
else if (event.touchAction == TOUCH_MOVE) else if (event.touchAction == TOUCH_MOVE)
{ {
magnitude = Vector2Distance(moveDownPosition, moveDownPosition2); pinchDistance = Vector2Distance(moveDownPosition, moveDownPosition2);
touchDownPosition = moveDownPosition; touchDownPosition = moveDownPosition;
touchDownPosition2 = moveDownPosition2; touchDownPosition2 = moveDownPosition2;
@ -217,7 +215,7 @@ void ProcessGestureEvent(GestureEvent event)
if ((Vector2Distance(touchDownPosition, moveDownPosition) > FORCE_TO_PINCH) || (Vector2Distance(touchDownPosition2, moveDownPosition2) > FORCE_TO_PINCH)) if ((Vector2Distance(touchDownPosition, moveDownPosition) > FORCE_TO_PINCH) || (Vector2Distance(touchDownPosition2, moveDownPosition2) > FORCE_TO_PINCH))
{ {
if ((Vector2Distance(moveDownPosition, moveDownPosition2) - magnitude) < 0) currentGesture = GESTURE_PINCH_IN; if ((Vector2Distance(moveDownPosition, moveDownPosition2) - pinchDistance) < 0) currentGesture = GESTURE_PINCH_IN;
else currentGesture = GESTURE_PINCH_OUT; else currentGesture = GESTURE_PINCH_OUT;
} }
else else
@ -227,6 +225,8 @@ void ProcessGestureEvent(GestureEvent event)
} }
else if (event.touchAction == TOUCH_UP) else if (event.touchAction == TOUCH_UP)
{ {
pinchDistance = 0.0f;
currentGesture = GESTURE_NONE; currentGesture = GESTURE_NONE;
} }
} }
@ -272,41 +272,47 @@ void SetGesturesEnabled(unsigned int gestureFlags)
enabledGestures = gestureFlags; enabledGestures = gestureFlags;
} }
// Get drag intensity (pixels per frame) // Get drag dragIntensity (pixels per frame)
float GetGestureDragIntensity(void) float GetGestureDragdragIntensity(void)
{ {
return intensity; return dragIntensity;
} }
// Get drag angle // Get drag angle
// NOTE: Angle in degrees, horizontal-right is 0, counterclock-wise // NOTE: Angle in degrees, horizontal-right is 0, counterclock-wise
float GetGestureDragAngle(void) float GetGestureDragAngle(void)
{ {
return angle; return dragAngle;
} }
// Get drag vector (between initial and final position) // Get drag vector (between initial and final position)
Vector2 GetGestureDragVector(void) Vector2 GetGestureDragVector(void)
{ {
// TODO: Calculate DRAG vector
return dragVector; return dragVector;
} }
// Hold time measured in frames // Hold time measured in ms
int GetGestureHoldDuration(void) int GetGestureHoldDuration(void)
{ {
// TODO: Return last hold time in ms
return 0; return 0;
} }
// Get magnitude between two pinch points // Get distance between two pinch points
float GetGesturePinchDelta(void) float GetGesturePinchDelta(void)
{ {
return pinchDelta; return pinchDistance;
} }
// Get angle beween two pinch points // Get angle beween two pinch points
// NOTE: Angle in degrees, horizontal-right is 0, counterclock-wise // NOTE: Angle in degrees, horizontal-right is 0, counterclock-wise
float GetGesturePinchAngle(void) float GetGesturePinchAngle(void)
{ {
// TODO: Calculate pinch angle
return 0; return 0;
} }
@ -314,13 +320,23 @@ float GetGesturePinchAngle(void)
// Module specific Functions Definition // Module specific Functions Definition
//---------------------------------------------------------------------------------- //----------------------------------------------------------------------------------
// RAY: Do we really need magnitude??? why???
// TODO: Remove magnitude dependency...
static float CalculateAngle(Vector2 initialPosition, Vector2 finalPosition, float magnitude) static float CalculateAngle(Vector2 initialPosition, Vector2 finalPosition, float magnitude)
{ {
float angle; float angle;
// Calculate arcsinus of the movement // Calculate arcsinus of the movement // RAY: o__O
angle = asin((finalPosition.y - initialPosition.y)/magnitude); angle = asin((finalPosition.y - initialPosition.y)/magnitude);
angle *= RAD2DEG; angle *= RAD2DEG;
// RAY: review this (better) solution
//angle = atan2(p1.y - p2.y, p1.x - p2.x);
//angle *= RAD2DEG;
// http://stackoverflow.com/questions/21483999/using-atan2-to-find-angle-between-two-vectors
// TODO: Remove sector dependency (self-note: check moving eyes exercise)
// Calculate angle depending on the sector // Calculate angle depending on the sector
if ((finalPosition.x - initialPosition.x) >= 0) if ((finalPosition.x - initialPosition.x) >= 0)
@ -349,6 +365,7 @@ static float CalculateAngle(Vector2 initialPosition, Vector2 finalPosition, floa
return angle; return angle;
} }
// Calculate distance between two Vector2
static float Vector2Distance(Vector2 v1, Vector2 v2) static float Vector2Distance(Vector2 v1, Vector2 v2)
{ {
float result; float result;