feat: backporting existing raylib-cs examples and new official raylib examples to WASM, adopting raylib's original code style
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Examples/Shapes/EasingsTestbed.cs
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Examples/Shapes/EasingsTestbed.cs
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/*******************************************************************************************
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*
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* raylib [shapes] example - easings testbed
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*
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* Example complexity rating: [★★★☆] 3/4
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*
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* Example originally created with raylib 2.5, last time updated with raylib 2.5
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*
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* Example contributed by Juan Miguel López (@flashback-fx) and reviewed by Ramon Santamaria (@raysan5)
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*
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* Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
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* BSD-like license that allows static linking with closed source software
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*
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* Copyright (c) 2019-2025 Juan Miguel López (@flashback-fx) and Ramon Santamaria (@raysan5)
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*
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********************************************************************************************/
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using System;
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using System.Numerics;
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using Examples.Shared;
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using static Raylib_cs.Raylib;
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namespace Examples.Shapes;
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public partial class EasingsTestbed : IExample
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{
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private const int screenWidth = 800;
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private const int screenHeight = 450;
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private const int FONT_SIZE = 20;
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private const float D_STEP = 20.0f;
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private const float D_STEP_FINE = 2.0f;
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private const float D_MIN = 1.0f;
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private const float D_MAX = 10000.0f;
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public string Name => "Shapes / Easings Testbed";
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public string Title => "raylib [shapes] example - easings testbed";
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// Easing types
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private const int EASE_LINEAR_NONE = 0;
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private const int NUM_EASING_TYPES = 27;
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private const int EASING_NONE = NUM_EASING_TYPES;
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// NoEase function, used when "no easing" is selected for any axis
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// It just ignores all parameters besides b
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private static float NoEase(float t, float b, float c, float d)
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{
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// Hack to avoid compiler warning (about unused variables)
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float burn = t + b + c + d;
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d += burn;
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return b;
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}
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// Easing functions reference data
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private string[] easingNames;
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private Func<float, float, float, float, float>[] easingFuncs;
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private Vector2 ballPosition;
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private float t; // Current time (in any unit measure, but same unit as duration)
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private float d; // Total time it should take to complete (duration)
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private bool paused;
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private bool boundedT; // If true, t will stop when d >= td, otherwise t will keep adding td to its value every loop
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private int easingX; // Easing selected for x axis
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private int easingY; // Easing selected for y axis
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public void Init()
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{
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easingNames = new string[]
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{
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"EaseLinearNone", "EaseLinearIn", "EaseLinearOut", "EaseLinearInOut",
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"EaseSineIn", "EaseSineOut", "EaseSineInOut",
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"EaseCircIn", "EaseCircOut", "EaseCircInOut",
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"EaseCubicIn", "EaseCubicOut", "EaseCubicInOut",
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"EaseQuadIn", "EaseQuadOut", "EaseQuadInOut",
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"EaseExpoIn", "EaseExpoOut", "EaseExpoInOut",
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"EaseBackIn", "EaseBackOut", "EaseBackInOut",
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"EaseBounceOut", "EaseBounceIn", "EaseBounceInOut",
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"EaseElasticIn", "EaseElasticOut", "EaseElasticInOut",
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"None",
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};
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easingFuncs = new Func<float, float, float, float, float>[]
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{
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Easings.EaseLinearNone, Easings.EaseLinearIn, Easings.EaseLinearOut, Easings.EaseLinearInOut,
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Easings.EaseSineIn, Easings.EaseSineOut, Easings.EaseSineInOut,
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Easings.EaseCircIn, Easings.EaseCircOut, Easings.EaseCircInOut,
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Easings.EaseCubicIn, Easings.EaseCubicOut, Easings.EaseCubicInOut,
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Easings.EaseQuadIn, Easings.EaseQuadOut, Easings.EaseQuadInOut,
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Easings.EaseExpoIn, Easings.EaseExpoOut, Easings.EaseExpoInOut,
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Easings.EaseBackIn, Easings.EaseBackOut, Easings.EaseBackInOut,
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Easings.EaseBounceOut, Easings.EaseBounceIn, Easings.EaseBounceInOut,
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Easings.EaseElasticIn, Easings.EaseElasticOut, Easings.EaseElasticInOut,
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NoEase,
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};
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ballPosition = new Vector2(100.0f, 100.0f);
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t = 0.0f;
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d = 300.0f;
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paused = true;
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boundedT = true;
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easingX = EASING_NONE;
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easingY = EASING_NONE;
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}
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public void Update()
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{
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// Update
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//----------------------------------------------------------------------------------
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if (IsKeyPressed(KeyboardKey.T)) boundedT = !boundedT;
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// Choose easing for the X axis
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if (IsKeyPressed(KeyboardKey.Right))
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{
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easingX++;
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if (easingX > EASING_NONE) easingX = 0;
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}
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else if (IsKeyPressed(KeyboardKey.Left))
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{
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if (easingX == 0) easingX = EASING_NONE;
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else easingX--;
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}
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// Choose easing for the Y axis
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if (IsKeyPressed(KeyboardKey.Down))
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{
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easingY++;
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if (easingY > EASING_NONE) easingY = 0;
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}
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else if (IsKeyPressed(KeyboardKey.Up))
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{
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if (easingY == 0) easingY = EASING_NONE;
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else easingY--;
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}
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// Change d (duration) value
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if (IsKeyPressed(KeyboardKey.W) && (d < D_MAX - D_STEP)) d += D_STEP;
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else if (IsKeyPressed(KeyboardKey.Q) && (d > D_MIN + D_STEP)) d -= D_STEP;
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if (IsKeyDown(KeyboardKey.S) && (d < D_MAX - D_STEP_FINE)) d += D_STEP_FINE;
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else if (IsKeyDown(KeyboardKey.A) && (d > D_MIN + D_STEP_FINE)) d -= D_STEP_FINE;
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// Play, pause and restart controls
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if (IsKeyPressed(KeyboardKey.Space) || IsKeyPressed(KeyboardKey.T) ||
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IsKeyPressed(KeyboardKey.Right) || IsKeyPressed(KeyboardKey.Left) ||
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IsKeyPressed(KeyboardKey.Down) || IsKeyPressed(KeyboardKey.Up) ||
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IsKeyPressed(KeyboardKey.W) || IsKeyPressed(KeyboardKey.Q) ||
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IsKeyDown(KeyboardKey.S) || IsKeyDown(KeyboardKey.A) ||
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(IsKeyPressed(KeyboardKey.Enter) && (boundedT == true) && (t >= d)))
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{
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t = 0.0f;
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ballPosition.X = 100.0f;
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ballPosition.Y = 100.0f;
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paused = true;
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}
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if (IsKeyPressed(KeyboardKey.Enter)) paused = !paused;
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// Movement computation
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if (!paused && ((boundedT && t < d) || !boundedT))
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{
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ballPosition.X = easingFuncs[easingX](t, 100.0f, 700.0f - 170.0f, d);
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ballPosition.Y = easingFuncs[easingY](t, 100.0f, 400.0f - 170.0f, d);
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t += 1.0f;
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}
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//----------------------------------------------------------------------------------
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// Draw
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//----------------------------------------------------------------------------------
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BeginDrawing();
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ClearBackground(Color.RayWhite);
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// Draw information text
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DrawText($"Easing x: {easingNames[easingX]}", 20, FONT_SIZE, FONT_SIZE, Color.LightGray);
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DrawText($"Easing y: {easingNames[easingY]}", 20, FONT_SIZE * 2, FONT_SIZE, Color.LightGray);
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DrawText($"t ({(boundedT == true ? 'b' : 'u')}) = {t:F2} d = {d:F2}", 20, FONT_SIZE * 3, FONT_SIZE, Color.LightGray);
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// Draw instructions text
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DrawText("Use ENTER to play or pause movement, use SPACE to restart", 20, GetScreenHeight() - FONT_SIZE * 2, FONT_SIZE, Color.LightGray);
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DrawText("Use Q and W or A and S keys to change duration", 20, GetScreenHeight() - FONT_SIZE * 3, FONT_SIZE, Color.LightGray);
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DrawText("Use LEFT or RIGHT keys to choose easing for the x axis", 20, GetScreenHeight() - FONT_SIZE * 4, FONT_SIZE, Color.LightGray);
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DrawText("Use UP or DOWN keys to choose easing for the y axis", 20, GetScreenHeight() - FONT_SIZE * 5, FONT_SIZE, Color.LightGray);
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// Draw ball
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DrawCircleV(ballPosition, 16.0f, Color.Maroon);
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EndDrawing();
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//----------------------------------------------------------------------------------
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}
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public void Unload()
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{
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}
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public static int Main()
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{
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// Initialization
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//--------------------------------------------------------------------------------------
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InitWindow(screenWidth, screenHeight, "raylib [shapes] example - easings testbed");
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SetTargetFPS(60);
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//--------------------------------------------------------------------------------------
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var game = new EasingsTestbed();
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game.Init();
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// Main game loop
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while (!WindowShouldClose()) // Detect window close button or ESC key
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{
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game.Update();
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}
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game.Unload();
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// De-Initialization
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//--------------------------------------------------------------------------------------
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CloseWindow();
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//--------------------------------------------------------------------------------------
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return 0;
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}
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}
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