124 lines
4.3 KiB
C#
124 lines
4.3 KiB
C#
/*******************************************************************************************
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*
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* raylib [shapes] example - Draw a mouse trail (position history)
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*
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* Example complexity rating: [★☆☆☆] 1/4
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*
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* Example originally created with raylib 5.6
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*
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* Example contributed by Balamurugan R (@Bala050814]) 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) 2025 Balamurugan R (@Bala050814)
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*
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********************************************************************************************/
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namespace Examples.Shapes;
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public partial class MouseTrail : 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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// Define the maximum number of positions to store in the trail
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private const int MAX_TRAIL_LENGTH = 30;
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public string Name => "Shapes / Mouse Trail";
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public string Title => "raylib [shapes] example - mouse trail";
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// Array to store the history of mouse positions (our fixed-size queue)
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private Vector2[] trailPositions;
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public void Init()
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{
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// Array to store the history of mouse positions (our fixed-size queue)
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trailPositions = new Vector2[MAX_TRAIL_LENGTH];
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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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Vector2 mousePosition = GetMousePosition();
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// Shift all existing positions backward by one slot in the array
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// The last element (the oldest position) is dropped
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for (int i = MAX_TRAIL_LENGTH - 1; i > 0; i--)
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{
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trailPositions[i] = trailPositions[i - 1];
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}
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// Store the new, current mouse position at the start of the array (Index 0)
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trailPositions[0] = mousePosition;
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//----------------------------------------------------------------------------------
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// Draw
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//----------------------------------------------------------------------------------
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BeginDrawing();
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ClearBackground(Color.Black);
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// Draw the trail by looping through the history array
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for (int i = 0; i < MAX_TRAIL_LENGTH; i++)
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{
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// Ensure we skip drawing if the array hasn't been fully filled on startup
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if ((trailPositions[i].X != 0.0f) || (trailPositions[i].Y != 0.0f))
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{
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// Calculate relative trail strength (ratio is near 1.0 for new, near 0.0 for old)
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float ratio = (float)(MAX_TRAIL_LENGTH - i) / MAX_TRAIL_LENGTH;
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// Fade effect: oldest positions are more transparent
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// Fade (color, alpha) - alpha is 0.5 to 1.0 based on ratio
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Color trailColor = Fade(Color.SkyBlue, ratio * 0.5f + 0.5f);
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// Size effect: oldest positions are smaller
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float trailRadius = 15.0f * ratio;
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DrawCircleV(trailPositions[i], trailRadius, trailColor);
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}
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}
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// Draw a distinct white circle for the current mouse position (Index 0)
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DrawCircleV(mousePosition, 15.0f, Color.White);
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DrawText("Move the mouse to see the trail effect!", 10, screenHeight - 30, 20, Color.LightGray);
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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 - mouse trail");
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SetTargetFPS(60);
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//--------------------------------------------------------------------------------------
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var game = new MouseTrail();
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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(); // Close window and OpenGL context
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//--------------------------------------------------------------------------------------
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return 0;
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}
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}
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