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[example] Core Input Gestures for Web (#3172)

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* [example] Core Input Gestures for Web

* Fix Doubletap for web

* Changes TAP_TIMEOUT and rgGetCurrentTime to seconds
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ubkp 2023-07-16 08:07:29 -03:00 • committed by GitHub
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examples/core/core_input_gestures_web.c Normal file
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/*******************************************************************************************
*
* raylib [core] example - Input Gestures for Web
*
* Example originally created with raylib 4.6-dev, last time updated with raylib 4.6-dev
*
* Example contributed by ubkp (@ubkp) and reviewed by Ramon Santamaria (@raysan5)
*
* Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
* BSD-like license that allows static linking with closed source software
*
* Copyright (c) 2023 ubkp (@ubkp)
*
********************************************************************************************/
#include "raylib.h"
#include "math.h" // Required for the protractor angle graphic drawing
#if defined(PLATFORM_WEB)
#include <emscripten/emscripten.h> // Required for the Web/HTML5
#endif
//--------------------------------------------------------------------------------------
// Global definitions and declarations
//--------------------------------------------------------------------------------------
// Common variables definitions
//--------------------------------------------------------------------------------------
int screenWidth = 800;
const int screenHeight = 450;
Vector2 messagePosition = {160, 7};
// Last gesture variables definitions
//--------------------------------------------------------------------------------------
int lastGesture = 0;
Vector2 lastGesturePosition = {165, 130};
// Gesture log variables definitions and functions declarations
//--------------------------------------------------------------------------------------
#define GESTURE_LOG_SIZE 20
char gestureLog[GESTURE_LOG_SIZE][12] = { "" }; // The gesture log uses an array (as an inverted circular queue) to store the performed gestures
int gestureLogIndex = GESTURE_LOG_SIZE; // The index for the inverted circular queue (moving from last to first direction, then looping around)
int previousGesture = 0;
char const *GetGestureName(int i)
{
switch (i) {
case 0: return "None"; break;
case 1: return "Tap"; break;
case 2: return "Double Tap"; break;
case 4: return "Hold"; break;
case 8: return "Drag"; break;
case 16: return "Swipe Right"; break;
case 32: return "Swipe Left"; break;
case 64: return "Swipe Up"; break;
case 128: return "Swipe Down"; break;
case 256: return "Pinch In"; break;
case 512: return "Pinch Out"; break;
default: return "Unknown"; break;
}
}
Color GetGestureColor(int i)
{
switch (i) {
case 0: return BLACK; break;
case 1: return BLUE; break;
case 2: return SKYBLUE; break;
case 4: return BLACK; break;
case 8: return LIME; break;
case 16: return RED; break;
case 32: return RED; break;
case 64: return RED; break;
case 128: return RED; break;
case 256: return VIOLET; break;
case 512: return ORANGE; break;
default: return BLACK; break;
}
}
Color gestureColor = BLACK;
int logMode = 1; // Log mode values: 0 shows repeated events; 1 hides repeated events; 2 shows repeated events but hide hold events; 3 hides repeated events and hide hold events
Rectangle logButton1 = {53, 7, 48, 26};
Rectangle logButton2 = {108, 7, 36, 26};
Vector2 gestureLogPosition = {10, 10};
// Protractor variables definitions
//--------------------------------------------------------------------------------------
float angleLength = 90.0f;
float currentAngleDegrees = 0.0f;
Vector2 finalVector = {0.0f, 0.0f};
char currentAngleStr[7] = "";
Vector2 protractorPosition = {266.0f, 315.0f};
// Update
//--------------------------------------------------------------------------------------
void Update(void)
{
// Handle common
//--------------------------------------------------------------------------------------
int i, ii; // Iterators that will be reused by all for loops
const int currentGesture = GetGestureDetected();
const float currentDragDegrees = GetGestureDragAngle();
const float currentPitchDegrees = GetGesturePinchAngle();
const int touchCount = GetTouchPointCount();
// Handle last gesture
//--------------------------------------------------------------------------------------
if ( currentGesture != 0 && currentGesture != 4 && currentGesture != previousGesture ) lastGesture = currentGesture; // Filter the meaningful gestures (1, 2, 8 to 512) for the display
// Handle gesture log
//--------------------------------------------------------------------------------------
if ( IsMouseButtonReleased(MOUSE_BUTTON_LEFT) )
{
if ( CheckCollisionPointRec(GetMousePosition(), logButton1 ) )
{
switch (logMode)
{
case 3: logMode=2; break;
case 2: logMode=3; break;
case 1: logMode=0; break;
default: logMode=1; break;
}
}
else if ( CheckCollisionPointRec(GetMousePosition(), logButton2) )
{
switch (logMode)
{
case 3: logMode=1; break;
case 2: logMode=0; break;
case 1: logMode=3; break;
default: logMode=2; break;
}
}
}
int fillLog = 0; // Gate variable to be used to allow or not the gesture log to be filled
if (currentGesture !=0)
{
if (logMode == 3) // 3 hides repeated events and hide hold events
{
if ( ( currentGesture != 4 && currentGesture != previousGesture ) || currentGesture < 3 ) fillLog = 1;
}
else if (logMode == 2) // 2 shows repeated events but hide hold events
{
if (currentGesture != 4) fillLog = 1;
}
else if (logMode == 1) // 1 hides repeated events
{
if (currentGesture != previousGesture) fillLog = 1;
}
else // 0 shows repeated events
{
fillLog = 1;
}
}
if (fillLog) // If one of the conditions from logMode was met, fill the gesture log
{
previousGesture = currentGesture;
gestureColor = GetGestureColor(currentGesture);
if (gestureLogIndex <= 0) gestureLogIndex = GESTURE_LOG_SIZE;
gestureLogIndex--;
TextCopy( gestureLog[gestureLogIndex], GetGestureName(currentGesture) ); // Copy the gesture respective name to the gesture log array
}
// Handle protractor
//--------------------------------------------------------------------------------------
if (currentGesture > 255) // aka Pinch In and Pinch Out
{
currentAngleDegrees = currentPitchDegrees;
}
else if (currentGesture > 15) // aka Swipe Right, Swipe Left, Swipe Up and Swipe Down
{
currentAngleDegrees = currentDragDegrees;
}
else if (currentGesture > 0) // aka Tap, Doubletap, Hold and Grab
{
currentAngleDegrees = 0.0f;
}
float currentAngleRadians = ( (currentAngleDegrees +90.0f)*PI/180 ); // Convert the current angle to Radians
finalVector = (Vector2){ ( angleLength*sinf(currentAngleRadians) ) + protractorPosition.x, ( angleLength*cosf(currentAngleRadians) ) + protractorPosition.y }; // Calculate the final vector for display
// Handle touch and mouse pointer points
//--------------------------------------------------------------------------------------
Vector2 touchPosition[touchCount];
Vector2 mousePosition = {0, 0};
if (currentGesture != GESTURE_NONE)
{
if (touchCount != 0)
{
for (i = 0; i < touchCount; i++) touchPosition[i] = GetTouchPosition(i); // Fill the touch positions
}
else
{
mousePosition = GetMousePosition();
}
}
// Draw
//--------------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(RAYWHITE);
// Draw common
//--------------------------------------------------------------------------------------
DrawText("*", messagePosition.x + 5, messagePosition.y + 5, 10, BLACK);
DrawText("Example optimized for Web/HTML5\non Smartphones with Touch Screen.", messagePosition.x + 15, messagePosition.y + 5, 10, BLACK);
DrawText("*", messagePosition.x + 5, messagePosition.y + 35, 10, BLACK);
DrawText("While running on Desktop Web Browsers,\ninspect and turn on Touch Emulation.", messagePosition.x + 15, messagePosition.y + 35, 10, BLACK);
// Draw last gesture
//--------------------------------------------------------------------------------------
DrawText("Last gesture", lastGesturePosition.x + 33, lastGesturePosition.y - 47, 20, BLACK);
DrawText("Swipe Tap Pinch Touch", lastGesturePosition.x + 17, lastGesturePosition.y - 18, 10, BLACK);
DrawRectangle(lastGesturePosition.x + 20, lastGesturePosition.y, 20, 20, lastGesture == GESTURE_SWIPE_UP ? RED : LIGHTGRAY);
DrawRectangle(lastGesturePosition.x, lastGesturePosition.y + 20, 20, 20, lastGesture == GESTURE_SWIPE_LEFT ? RED : LIGHTGRAY);
DrawRectangle(lastGesturePosition.x + 40, lastGesturePosition.y + 20, 20, 20, lastGesture == GESTURE_SWIPE_RIGHT ? RED : LIGHTGRAY);
DrawRectangle(lastGesturePosition.x + 20, lastGesturePosition.y + 40, 20, 20, lastGesture == GESTURE_SWIPE_DOWN ? RED : LIGHTGRAY);
DrawCircle(lastGesturePosition.x + 80, lastGesturePosition.y + 16, 10, lastGesture == GESTURE_TAP ? BLUE : LIGHTGRAY);
DrawRing( (Vector2){lastGesturePosition.x + 103, lastGesturePosition.y + 16}, 6.0f, 11.0f, 0.0f, 360.0f, 0, lastGesture == GESTURE_DRAG ? LIME : LIGHTGRAY);
DrawCircle(lastGesturePosition.x + 80, lastGesturePosition.y + 43, 10, lastGesture == GESTURE_DOUBLETAP ? SKYBLUE : LIGHTGRAY);
DrawCircle(lastGesturePosition.x + 103, lastGesturePosition.y + 43, 10, lastGesture == GESTURE_DOUBLETAP ? SKYBLUE : LIGHTGRAY);
DrawTriangle( (Vector2){lastGesturePosition.x + 122, lastGesturePosition.y + 16}, (Vector2){lastGesturePosition.x + 137, lastGesturePosition.y + 26}, (Vector2){lastGesturePosition.x + 137, lastGesturePosition.y + 6}, lastGesture == GESTURE_PINCH_OUT ? ORANGE : LIGHTGRAY);
DrawTriangle( (Vector2){lastGesturePosition.x + 147, lastGesturePosition.y + 6}, (Vector2){lastGesturePosition.x + 147, lastGesturePosition.y + 26}, (Vector2){lastGesturePosition.x + 162, lastGesturePosition.y + 16}, lastGesture == GESTURE_PINCH_OUT ? ORANGE : LIGHTGRAY);
DrawTriangle( (Vector2){lastGesturePosition.x + 125, lastGesturePosition.y + 33}, (Vector2){lastGesturePosition.x + 125, lastGesturePosition.y + 53}, (Vector2){lastGesturePosition.x + 140, lastGesturePosition.y + 43}, lastGesture == GESTURE_PINCH_IN ? VIOLET : LIGHTGRAY);
DrawTriangle( (Vector2){lastGesturePosition.x + 144, lastGesturePosition.y + 43}, (Vector2){lastGesturePosition.x + 159, lastGesturePosition.y + 53}, (Vector2){lastGesturePosition.x + 159, lastGesturePosition.y + 33}, lastGesture == GESTURE_PINCH_IN ? VIOLET : LIGHTGRAY);
for ( i = 0; i < 4; i++ ) DrawCircle(lastGesturePosition.x + 180, lastGesturePosition.y + 7 + i*15, 5, touchCount <= i ? LIGHTGRAY : gestureColor);
// Draw gesture log
//--------------------------------------------------------------------------------------
DrawText("Log", gestureLogPosition.x, gestureLogPosition.y, 20, BLACK);
// Loop in both directions to print the gesture log array in the inverted order (and looping around if the index started somewhere in the middle)
for (i = 0, ii = gestureLogIndex; i < GESTURE_LOG_SIZE; i++, ii = (ii + 1) % GESTURE_LOG_SIZE) DrawText(gestureLog[ii], gestureLogPosition.x, gestureLogPosition.y + 410 - i*20, 20, (i == 0 ? gestureColor : LIGHTGRAY));
Color logButton1Color, logButton2Color;
switch (logMode)
{
case 3: logButton1Color=MAROON; logButton2Color=MAROON; break;
case 2: logButton1Color=GRAY; logButton2Color=MAROON; break;
case 1: logButton1Color=MAROON; logButton2Color=GRAY; break;
default: logButton1Color=GRAY; logButton2Color=GRAY; break;
}
DrawRectangleRec( logButton1, logButton1Color);
DrawText("Hide", logButton1.x + 7, logButton1.y + 3, 10, WHITE);
DrawText("Repeat", logButton1.x + 7, logButton1.y + 13, 10, WHITE);
DrawRectangleRec( logButton2, logButton2Color);
DrawText("Hide", logButton1.x + 62, logButton1.y + 3, 10, WHITE);
DrawText("Hold", logButton1.x + 62, logButton1.y + 13, 10, WHITE);
// Draw protractor
//--------------------------------------------------------------------------------------
DrawText("Angle", protractorPosition.x + 55, protractorPosition.y + 76, 10, BLACK);
const char *angleString = TextFormat("%f", currentAngleDegrees);
const int angleStringDot = TextFindIndex(angleString, ".");
const char *angleStringTrim = TextSubtext(angleString, 0, angleStringDot + 3);
DrawText( angleStringTrim, protractorPosition.x + 55, protractorPosition.y + 92, 20, gestureColor);
DrawCircle(protractorPosition.x, protractorPosition.y, 80.0f, WHITE);
DrawLineEx( (Vector2){protractorPosition.x - 90, protractorPosition.y}, (Vector2){protractorPosition.x + 90, protractorPosition.y}, 3.0f, LIGHTGRAY);
DrawLineEx( (Vector2){protractorPosition.x, protractorPosition.y - 90}, (Vector2){protractorPosition.x, protractorPosition.y + 90}, 3.0f, LIGHTGRAY);
DrawLineEx( (Vector2){protractorPosition.x - 80, protractorPosition.y - 45}, (Vector2){protractorPosition.x + 80, protractorPosition.y + 45}, 3.0f, GREEN);
DrawLineEx( (Vector2){protractorPosition.x - 80, protractorPosition.y + 45}, (Vector2){protractorPosition.x + 80, protractorPosition.y - 45}, 3.0f, GREEN);
DrawText("0", protractorPosition.x + 96, protractorPosition.y - 9, 20, BLACK);
DrawText("30", protractorPosition.x + 74, protractorPosition.y - 68, 20, BLACK);
DrawText("90", protractorPosition.x - 11, protractorPosition.y - 110, 20, BLACK);
DrawText("150", protractorPosition.x - 100, protractorPosition.y - 68, 20, BLACK);
DrawText("180", protractorPosition.x - 124, protractorPosition.y - 9, 20, BLACK);
DrawText("210", protractorPosition.x - 100, protractorPosition.y + 50, 20, BLACK);
DrawText("270", protractorPosition.x - 18, protractorPosition.y + 92, 20, BLACK);
DrawText("330", protractorPosition.x + 72, protractorPosition.y + 50, 20, BLACK);
if ( currentAngleDegrees != 0.0f ) DrawLineEx( protractorPosition, finalVector, 3.0f, gestureColor);
// Draw touch and mouse pointer points
//--------------------------------------------------------------------------------------
if (currentGesture != GESTURE_NONE)
{
if ( touchCount != 0 )
{
for (i = 0; i < touchCount; i++)
{
DrawCircleV(touchPosition[i], 50.0f, Fade(gestureColor, 0.5f));
DrawCircleV(touchPosition[i], 5.0f, gestureColor);
}
if (touchCount == 2) DrawLineEx( touchPosition[0], touchPosition[1], (currentGesture == 512 ? 8 : 12), gestureColor);
}
else
{
DrawCircleV(mousePosition, 35.0f, Fade(gestureColor, 0.5f));
DrawCircleV(mousePosition, 5.0f, gestureColor);
}
}
EndDrawing();
//--------------------------------------------------------------------------------------
}
//------------------------------------------------------------------------------------
// Program main entry point
//------------------------------------------------------------------------------------
int main(void)
{
// Initialization
//--------------------------------------------------------------------------------------
#if defined( PLATFORM_WEB )
const int canvasWidth = EM_ASM_INT( return document.getElementById('canvas').getBoundingClientRect().width; ); // Using Emscripten EM_ASM_INT macro, get the page canvas width
if (canvasWidth > 400)
{
screenWidth = canvasWidth;
}
else
{
screenWidth = 400; // Set a minimum width for the screen
}
#endif
InitWindow(screenWidth, screenHeight, "raylib [core] example - input gestures web");
//--------------------------------------------------------------------------------------
// Main game loop
//--------------------------------------------------------------------------------------
#if defined(PLATFORM_WEB)
emscripten_set_main_loop(Update, 0, 1);
#else
SetTargetFPS(60);
while (!WindowShouldClose()) Update(); // Detect window close button or ESC key
#endif
//--------------------------------------------------------------------------------------
// De-Initialization
//--------------------------------------------------------------------------------------
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
return 0;
}

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