raylib/examples/core_gestures_detection.c

/*******************************************************************************************
*
*   raylib [core] example - Gestures Detection
*
*   This example has been created using raylib 1.4 (www.raylib.com)
*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
*
*   Copyright (c) 2016 Ramon Santamaria (@raysan5)
*
********************************************************************************************/

#include "raylib.h"
#include <string.h>

#define MAX_GESTURE_STRINGS   20

int main()
{
    // Initialization
    //--------------------------------------------------------------------------------------
    int screenWidth = 800;
    int screenHeight = 450;
    
    InitWindow(screenWidth, screenHeight, "raylib [core] example - gestures detection");
    
    Vector2 touchPosition = { 0, 0 };
    Rectangle touchArea = { 220, 10, screenWidth - 230, screenHeight - 20 };
    
    int gesturesCount = 0;
    char gestureStrings[MAX_GESTURE_STRINGS][32];

    int currentGesture = GESTURE_NONE;
    int lastGesture = GESTURE_NONE;
    
    //SetGesturesEnabled(0b0000000000001001);   // Enable only some gestures to be detected
    
    SetTargetFPS(30);
    //--------------------------------------------------------------------------------------

    // Main game loop
    while (!WindowShouldClose())    // Detect window close button or ESC key
    {
        // Update
        //----------------------------------------------------------------------------------
        lastGesture = currentGesture;
        touchPosition = GetTouchPosition(0);
        
        if (CheckCollisionPointRec(touchPosition, touchArea) &&  IsGestureDetected())
        {
            currentGesture = GetGestureType();
            
            if (currentGesture != lastGesture)
            {
                // Store gesture string
                switch (currentGesture)
                {
                    case GESTURE_TAP: strcpy(gestureStrings[gesturesCount], "GESTURE TAP"); break;
                    case GESTURE_DOUBLETAP: strcpy(gestureStrings[gesturesCount], "GESTURE DOUBLETAP"); break;
                    case GESTURE_HOLD: strcpy(gestureStrings[gesturesCount], "GESTURE HOLD"); break;
                    case GESTURE_DRAG: strcpy(gestureStrings[gesturesCount], "GESTURE DRAG"); break;
                    case GESTURE_SWIPE_RIGHT: strcpy(gestureStrings[gesturesCount], "GESTURE SWIPE RIGHT"); break;
                    case GESTURE_SWIPE_LEFT: strcpy(gestureStrings[gesturesCount], "GESTURE SWIPE LEFT"); break;
                    case GESTURE_SWIPE_UP: strcpy(gestureStrings[gesturesCount], "GESTURE SWIPE UP"); break;
                    case GESTURE_SWIPE_DOWN: strcpy(gestureStrings[gesturesCount], "GESTURE SWIPE DOWN"); break;
                    default: break;
                }
                
                gesturesCount++;
                
                // Reset gestures strings
                if (gesturesCount >= MAX_GESTURE_STRINGS)
                {
                    for (int i = 0; i < MAX_GESTURE_STRINGS; i++) strcpy(gestureStrings[i], "\0");
                    
                    gesturesCount = 0;
                }
            }
        }
        else currentGesture = GESTURE_NONE;
        //----------------------------------------------------------------------------------

        // Draw
        //----------------------------------------------------------------------------------
        BeginDrawing();

            ClearBackground(RAYWHITE);
            
            DrawRectangleRec(touchArea, GRAY);
            DrawRectangle(225, 15, screenWidth - 240, screenHeight - 30, RAYWHITE);
            
            DrawText("GESTURES TEST AREA", screenWidth - 270, screenHeight - 40, 20, Fade(GRAY, 0.5f));
            
            for (int i = 0; i < gesturesCount; i++)
            {
                if (i%2 == 0) DrawRectangle(10, 30 + 20*i, 200, 20, Fade(LIGHTGRAY, 0.5f));
                else DrawRectangle(10, 30 + 20*i, 200, 20, Fade(LIGHTGRAY, 0.3f));
                
                if (i < gesturesCount - 1) DrawText(gestureStrings[i], 35, 36 + 20*i, 10, DARKGRAY);
                else DrawText(gestureStrings[i], 35, 36 + 20*i, 10, MAROON);
            }
            
            DrawRectangleLines(10, 29, 200, screenHeight - 50, GRAY);
            DrawText("DETECTED GESTURES", 50, 15, 10, GRAY);
            
            if (currentGesture != GESTURE_NONE) DrawCircleV(touchPosition, 30, MAROON);
            
        EndDrawing();
        //----------------------------------------------------------------------------------
    }

    // De-Initialization
    //--------------------------------------------------------------------------------------   
    CloseWindow();        // Close window and OpenGL context
    //--------------------------------------------------------------------------------------
}