Hugging Face's logo

kimjunhan
/
vkgs-sim

Model card Files
xet
 Community
vkgs-sim / third_party /ktx-src /tests /loadtests /common /SwipeDetector.cpp
kimjunhan's picture
kimjunhan
Add files using upload-large-folder tool
dec7e7d verified
Raw History Blame Contribute Delete
5.98 kB
/* -*- tab-width: 4; -*- */
/* vi: set sw=2 ts=4 expandtab: */
/*
* Copyright 2017-2020 Mark Callow.
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @internal
* @class SwipeDetector
* @~English
*
* @brief Definition of a class for detecting swipes.
*
* @author Mark Callow, github.com/MarkCallow.
*/
#include <assert.h>
#include "SwipeDetector.h"
#include <SDL3/SDL_log.h>
#if !defined(SWIPEDETECTOR_LOG_GESTURE_EVENTS)
#define SWIPEDETECTOR_LOG_GESTURE_EVENTS 0
#endif
#if !defined(SWIPEDETECTOR_LOG_GESTURE_DETECTION)
#define SWIPEDETECTOR_LOG_GESTURE_DETECTION 0
#endif
bool
SwipeDetector::doEvent(SDL_Event* event)
{
bool result = false;
switch (event->type) {
case SDL_EVENT_FINGER_UP: {
int numFingers;
SDL_Finger** fingers = SDL_GetTouchFingers(event->tfinger.touchID, &numFingers);
if (SWIPEDETECTOR_LOG_GESTURE_EVENTS) {
SDL_Log("SD: Finger: %" SDL_PRIx64 " UP - fingers: %i, x: %f, y: %f",
event->tfinger.fingerID, numFingers, event->tfinger.x, event->tfinger.y);
}
// SDL_GetTouchFingers appears to return the number of fingers
// down *before* the event was generated, so 1 means the last finger
// just lifted.
if (numFingers == 1 && gestureStart.time != 0) {
gestureStart.time = 0;
gestureSwipe = false;
if (SWIPEDETECTOR_LOG_GESTURE_DETECTION) {
SDL_Log("***************** SD: FINGER_UP, %smultigesture done *****************",
gestureSwipe ? "Swipe complete & " : "");
}
} else {
result = true;
}
SDL_free(fingers);
break;
}
case GESTURE_MULTIGESTURE: {
Gesture_MultiGestureEvent& mgesture = *(Gesture_MultiGestureEvent *)event;
if (SWIPEDETECTOR_LOG_GESTURE_EVENTS) {
SDL_Log("SD: MG Event: x = %f, y = %f, dAng = %f (%f), dR = %f, numFingers = %i, time = %" SDL_PRIu64,
mgesture.x,
mgesture.y,
mgesture.dTheta * 180.0 / M_PI,
mgesture.dTheta,
mgesture.dDist,
mgesture.numFingers,
mgesture.timestamp);
}
if (SWIPEDETECTOR_LOG_GESTURE_DETECTION) {
SDL_Log("SD: mgestureSwipe = %i, time = %" SDL_PRIu64,
gestureSwipe,
(mgesture.timestamp - gestureStart.time) / 1000000);
}
if (gestureStart.time == 0) {
if (SWIPEDETECTOR_LOG_GESTURE_DETECTION) {
SDL_Log("************ SD: Multigesture detection start **************");
}
gestureStart.time = mgesture.timestamp;
gestureStart.point.x = mgesture.x;
gestureStart.point.y = mgesture.y;
lastVector.reset();
gestureSwipe = false;
} else {
if (!gestureSwipe) {
vector sv; // Vector from start point to current position
float velocity;
float theta; // Angle between current vector and previous vector.
float duration;
sv.w = mgesture.x - gestureStart.point.x;
sv.h = mgesture.y - gestureStart.point.y;
float distance = sv.length();
if (lastVector.has_value()) {
// SDL2 timestamps were in milliseconds, SDL3 are nanoseconds. Given the
// normalized distances reported, using nanoseconds leads to 0 velocitySq.
duration = static_cast<float>(
(mgesture.timestamp - gestureStart.time) / 1000000.0);
velocity = distance / duration;
assert(!std::isinf(velocity));
theta = static_cast<float>(lastVector->getAngle(sv));
if (SWIPEDETECTOR_LOG_GESTURE_DETECTION) {
SDL_Log("SD: Detection: distance = %f, velocity = %f, theta = %f, sv angle = %f, sv angle normalized = %f, lastv angle = %f",
distance, velocity, theta,
sv.getAngle(),
sv.getAngleNormalized(),
lastVector->getAngle());
}
lastVector = sv;
// Multiple events with the same timestamp is a possibility
// hence the isinf() check.
if (std::abs(theta) < 3.0 && std::abs(mgesture.dDist) > 0.01 && !std::isinf(velocity) && velocity > 0.0007) {
if (SWIPEDETECTOR_LOG_GESTURE_DETECTION)
SDL_Log("----------------- SD: Swipe %s detected -----------------",
toString(sv.getDirection()).c_str());
gestureSwipe = true;
if (SDL_EventEnabled(SDL_EVENT_USER)) {
SDL_Event user_event;
// SDL will copy this entire struct! Initialize to keep memory
// checkers happy.
SDL_zero(user_event);
user_event.type = SDL_EVENT_USER;
user_event.user.code = swipeGesture;
user_event.user.data1 = SwipeDetector::directionToPointer(sv.getDirection());
user_event.user.data2 = NULL;
SDL_PushEvent(&user_event);
}
} else {
if (SWIPEDETECTOR_LOG_GESTURE_DETECTION) SDL_Log("SD: No swipe detected.");
result = true;
}
} else {
lastVector = sv;
result = true;
}
}
}
break;
}
default:
result = true;
}
return result;
}