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+/*******************************************************************************************
+*
+*   raylib [easings] example - Easings Testbed
+*
+*   Example originally created with raylib 2.5, last time updated with raylib 2.5
+*
+*   Example contributed by Juan Miguel López (@flashback-fx) 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) 2019-2024 Juan Miguel López (@flashback-fx ) and Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+#include "raylib.h"
+
+#include "reasings.h"       // Required for easing functions
+
+#define FONT_SIZE         20
+
+#define D_STEP         20.0f
+#define D_STEP_FINE     2.0f
+#define D_MIN           1.0f
+#define D_MAX       10000.0f
+
+// Easing types
+enum EasingTypes {
+    EASE_LINEAR_NONE = 0,
+    EASE_LINEAR_IN,
+    EASE_LINEAR_OUT,
+    EASE_LINEAR_IN_OUT,
+    EASE_SINE_IN,
+    EASE_SINE_OUT,
+    EASE_SINE_IN_OUT,
+    EASE_CIRC_IN,
+    EASE_CIRC_OUT,
+    EASE_CIRC_IN_OUT,
+    EASE_CUBIC_IN,
+    EASE_CUBIC_OUT,
+    EASE_CUBIC_IN_OUT,
+    EASE_QUAD_IN,
+    EASE_QUAD_OUT,
+    EASE_QUAD_IN_OUT,
+    EASE_EXPO_IN,
+    EASE_EXPO_OUT,
+    EASE_EXPO_IN_OUT,
+    EASE_BACK_IN,
+    EASE_BACK_OUT,
+    EASE_BACK_IN_OUT,
+    EASE_BOUNCE_OUT,
+    EASE_BOUNCE_IN,
+    EASE_BOUNCE_IN_OUT,
+    EASE_ELASTIC_IN,
+    EASE_ELASTIC_OUT,
+    EASE_ELASTIC_IN_OUT,
+    NUM_EASING_TYPES,
+    EASING_NONE = NUM_EASING_TYPES
+};
+
+static float NoEase(float t, float b, float c, float d);  // NoEase function declaration, function used when "no easing" is selected for any axis
+
+// Easing functions reference data
+static const struct {
+    const char *name;
+    float (*func)(float, float, float, float);
+} Easings[] = {
+    [EASE_LINEAR_NONE] = { .name = "EaseLinearNone", .func = EaseLinearNone },
+    [EASE_LINEAR_IN] = { .name = "EaseLinearIn", .func = EaseLinearIn },
+    [EASE_LINEAR_OUT] = { .name = "EaseLinearOut", .func = EaseLinearOut },
+    [EASE_LINEAR_IN_OUT] = { .name = "EaseLinearInOut", .func = EaseLinearInOut },
+    [EASE_SINE_IN] = { .name = "EaseSineIn", .func = EaseSineIn },
+    [EASE_SINE_OUT] = { .name = "EaseSineOut", .func = EaseSineOut },
+    [EASE_SINE_IN_OUT] = { .name = "EaseSineInOut", .func = EaseSineInOut },
+    [EASE_CIRC_IN] = { .name = "EaseCircIn", .func = EaseCircIn },
+    [EASE_CIRC_OUT] = { .name = "EaseCircOut", .func = EaseCircOut },
+    [EASE_CIRC_IN_OUT] = { .name = "EaseCircInOut", .func = EaseCircInOut },
+    [EASE_CUBIC_IN] = { .name = "EaseCubicIn", .func = EaseCubicIn },
+    [EASE_CUBIC_OUT] = { .name = "EaseCubicOut", .func = EaseCubicOut },
+    [EASE_CUBIC_IN_OUT] = { .name = "EaseCubicInOut", .func = EaseCubicInOut },
+    [EASE_QUAD_IN] = { .name = "EaseQuadIn", .func = EaseQuadIn },
+    [EASE_QUAD_OUT] = { .name = "EaseQuadOut", .func = EaseQuadOut },
+    [EASE_QUAD_IN_OUT] = { .name = "EaseQuadInOut", .func = EaseQuadInOut },
+    [EASE_EXPO_IN] = { .name = "EaseExpoIn", .func = EaseExpoIn },
+    [EASE_EXPO_OUT] = { .name = "EaseExpoOut", .func = EaseExpoOut },
+    [EASE_EXPO_IN_OUT] = { .name = "EaseExpoInOut", .func = EaseExpoInOut },
+    [EASE_BACK_IN] = { .name = "EaseBackIn", .func = EaseBackIn },
+    [EASE_BACK_OUT] = { .name = "EaseBackOut", .func = EaseBackOut },
+    [EASE_BACK_IN_OUT] = { .name = "EaseBackInOut", .func = EaseBackInOut },
+    [EASE_BOUNCE_OUT] = { .name = "EaseBounceOut", .func = EaseBounceOut },
+    [EASE_BOUNCE_IN] = { .name = "EaseBounceIn", .func = EaseBounceIn },
+    [EASE_BOUNCE_IN_OUT] = { .name = "EaseBounceInOut", .func = EaseBounceInOut },
+    [EASE_ELASTIC_IN] = { .name = "EaseElasticIn", .func = EaseElasticIn },
+    [EASE_ELASTIC_OUT] = { .name = "EaseElasticOut", .func = EaseElasticOut },
+    [EASE_ELASTIC_IN_OUT] = { .name = "EaseElasticInOut", .func = EaseElasticInOut },
+    [EASING_NONE] = { .name = "None", .func = NoEase },
+};
+
+//------------------------------------------------------------------------------------
+// Program main entry point
+//------------------------------------------------------------------------------------
+int main(void)
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    const int screenWidth = 800;
+    const int screenHeight = 450;
+
+    InitWindow(screenWidth, screenHeight, "raylib [easings] example - easings testbed");
+
+    Vector2 ballPosition = { 100.0f, 100.0f };
+
+    float t = 0.0f;             // Current time (in any unit measure, but same unit as duration)
+    float d = 300.0f;           // Total time it should take to complete (duration)
+    bool paused = true;
+    bool boundedT = true;       // If true, t will stop when d >= td, otherwise t will keep adding td to its value every loop
+
+    int easingX = EASING_NONE;  // Easing selected for x axis
+    int easingY = EASING_NONE;  // Easing selected for y axis
+
+    SetTargetFPS(60);
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!WindowShouldClose())    // Detect window close button or ESC key
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        if (IsKeyPressed(KEY_T)) boundedT = !boundedT;
+
+        // Choose easing for the X axis
+        if (IsKeyPressed(KEY_RIGHT))
+        {
+            easingX++;
+
+            if (easingX > EASING_NONE) easingX = 0;
+        }
+        else if (IsKeyPressed(KEY_LEFT))
+        {
+            if (easingX == 0) easingX = EASING_NONE;
+            else easingX--;
+        }
+
+        // Choose easing for the Y axis
+        if (IsKeyPressed(KEY_DOWN))
+        {
+            easingY++;
+
+            if (easingY > EASING_NONE) easingY = 0;
+        }
+        else if (IsKeyPressed(KEY_UP))
+        {
+            if (easingY == 0) easingY = EASING_NONE;
+            else easingY--;
+        }
+
+        // Change d (duration) value
+        if (IsKeyPressed(KEY_W) && d < D_MAX - D_STEP) d += D_STEP;
+        else if (IsKeyPressed(KEY_Q) && d > D_MIN + D_STEP) d -= D_STEP;
+
+        if (IsKeyDown(KEY_S) && d < D_MAX - D_STEP_FINE) d += D_STEP_FINE;
+        else if (IsKeyDown(KEY_A) && d > D_MIN + D_STEP_FINE) d -= D_STEP_FINE;
+
+        // Play, pause and restart controls
+        if (IsKeyPressed(KEY_SPACE) || IsKeyPressed(KEY_T) ||
+            IsKeyPressed(KEY_RIGHT) || IsKeyPressed(KEY_LEFT) ||
+            IsKeyPressed(KEY_DOWN) || IsKeyPressed(KEY_UP) ||
+            IsKeyPressed(KEY_W) || IsKeyPressed(KEY_Q) ||
+            IsKeyDown(KEY_S)  || IsKeyDown(KEY_A) ||
+            (IsKeyPressed(KEY_ENTER) && (boundedT == true) && (t >= d)))
+        {
+            t = 0.0f;
+            ballPosition.x = 100.0f;
+            ballPosition.y = 100.0f;
+            paused = true;
+        }
+
+        if (IsKeyPressed(KEY_ENTER)) paused = !paused;
+
+        // Movement computation
+        if (!paused && ((boundedT && t < d) || !boundedT))
+        {
+            ballPosition.x = Easings[easingX].func(t, 100.0f, 700.0f - 170.0f, d);
+            ballPosition.y = Easings[easingY].func(t, 100.0f, 400.0f - 170.0f, d);
+            t += 1.0f;
+        }
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+            ClearBackground(RAYWHITE);
+
+            // Draw information text
+            DrawText(TextFormat("Easing x: %s", Easings[easingX].name), 20, FONT_SIZE, FONT_SIZE, LIGHTGRAY);
+            DrawText(TextFormat("Easing y: %s", Easings[easingY].name), 20, FONT_SIZE*2, FONT_SIZE, LIGHTGRAY);
+            DrawText(TextFormat("t (%c) = %.2f d = %.2f", (boundedT == true)? 'b' : 'u', t, d), 20, FONT_SIZE*3, FONT_SIZE, LIGHTGRAY);
+
+            // Draw instructions text
+            DrawText("Use ENTER to play or pause movement, use SPACE to restart", 20, GetScreenHeight() - FONT_SIZE*2, FONT_SIZE, LIGHTGRAY);
+            DrawText("Use Q and W or A and S keys to change duration", 20, GetScreenHeight() - FONT_SIZE*3, FONT_SIZE, LIGHTGRAY);
+            DrawText("Use LEFT or RIGHT keys to choose easing for the x axis", 20, GetScreenHeight() - FONT_SIZE*4, FONT_SIZE, LIGHTGRAY);
+            DrawText("Use UP or DOWN keys to choose easing for the y axis", 20, GetScreenHeight() - FONT_SIZE*5, FONT_SIZE, LIGHTGRAY);
+
+            // Draw ball
+            DrawCircleV(ballPosition, 16.0f, MAROON);
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+    CloseWindow();
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}
+
+
+// NoEase function, used when "no easing" is selected for any axis. It just ignores all parameters besides b.
+static float NoEase(float t, float b, float c, float d)
+{
+    float burn = t + b + c + d;  // Hack to avoid compiler warning (about unused variables)
+    d += burn;
+
+    return b;
+}