212 lines
9.4 KiB
C#
212 lines
9.4 KiB
C#
/*******************************************************************************************
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*
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* raylib [shapes] example - math sine cosine
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*
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* Example complexity rating: [★★☆☆] 2/4
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*
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* Example originally created with raylib 6.0, last time updated with raylib 6.0
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*
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* Example contributed by Jopestpe (@jopestpe) 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 Jopestpe (@jopestpe)
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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 static Raylib_cs.Raylib;
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using static Raylib_cs.Raymath;
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namespace Examples.Shapes;
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public partial class MathSineCosine : 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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// Wave points for sine/cosine visualization
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private const int WAVE_POINTS = 36;
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public string Name => "Shapes / Math Sine Cosine";
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public string Title => "raylib [shapes] example - math sine cosine";
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public ConfigFlags ConfigFlags => ConfigFlags.Msaa4xHint;
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private Vector2[] sinePoints;
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private Vector2[] cosPoints;
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private Vector2 center;
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private Rectangle start;
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private float radius;
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private float angle;
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private bool pause;
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public void Init()
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{
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sinePoints = new Vector2[WAVE_POINTS];
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cosPoints = new Vector2[WAVE_POINTS];
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center = new((screenWidth / 2.0f) - 30.0f, screenHeight / 2.0f);
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start = new(20.0f, screenHeight - 120.0f, 200.0f, 100.0f);
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radius = 130.0f;
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angle = 0.0f;
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pause = false;
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for (int i = 0; i < WAVE_POINTS; i++)
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{
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float t = i / (float)(WAVE_POINTS - 1);
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float currentAngle = t * 360.0f * DEG2RAD;
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sinePoints[i] = new(start.X + t * start.Width, start.Y + start.Height / 2.0f - MathF.Sin(currentAngle) * (start.Height / 2.0f));
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cosPoints[i] = new(start.X + t * start.Width, start.Y + start.Height / 2.0f - MathF.Cos(currentAngle) * (start.Height / 2.0f));
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}
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}
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public unsafe void Update()
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{
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// Update
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//----------------------------------------------------------------------------------
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float angleRad = angle * DEG2RAD;
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float cosRad = MathF.Cos(angleRad);
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float sinRad = MathF.Sin(angleRad);
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Vector2 point = new(center.X + cosRad * radius, center.Y - sinRad * radius);
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Vector2 limitMin = new(center.X - radius, center.Y - radius);
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Vector2 limitMax = new(center.X + radius, center.Y + radius);
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float complementary = 90.0f - angle;
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float supplementary = 180.0f - angle;
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float explementary = 360.0f - angle;
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float tangent = Clamp(MathF.Tan(angleRad), -10.0f, 10.0f);
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float cotangent = (MathF.Abs(tangent) > 0.001f) ? Clamp(1.0f / tangent, -radius, radius) : 0.0f;
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Vector2 tangentPoint = new(center.X + radius, center.Y - tangent * radius);
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Vector2 cotangentPoint = new(center.X + cotangent * radius, center.Y - radius);
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angle = Wrap(angle + (!pause ? 1.0f : 0.0f), 0.0f, 360.0f);
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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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// Cotangent (orange)
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DrawLineEx(new Vector2(center.X, limitMin.Y), new Vector2(cotangentPoint.X, limitMin.Y), 2.0f, Color.Orange);
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DrawLineDashed(center, cotangentPoint, 10, 4, Color.Orange);
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// Side background
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DrawLine(580, 0, 580, GetScreenHeight(), new Color(218, 218, 218, 255));
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DrawRectangle(580, 0, GetScreenWidth(), GetScreenHeight(), new Color(232, 232, 232, 255));
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// Base circle and axes
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DrawCircleLinesV(center, radius, Color.Gray);
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DrawLineEx(new Vector2(center.X, limitMin.Y), new Vector2(center.X, limitMax.Y), 1.0f, Color.Gray);
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DrawLineEx(new Vector2(limitMin.X, center.Y), new Vector2(limitMax.X, center.Y), 1.0f, Color.Gray);
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// Wave graph axes
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DrawLineEx(new Vector2(start.X, start.Y), new Vector2(start.X, start.Y + start.Height), 2.0f, Color.Gray);
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DrawLineEx(new Vector2(start.X + start.Width, start.Y), new Vector2(start.X + start.Width, start.Y + start.Height), 2.0f, Color.Gray);
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DrawLineEx(new Vector2(start.X, start.Y + start.Height / 2), new Vector2(start.X + start.Width, start.Y + start.Height / 2), 2.0f, Color.Gray);
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// Wave graph axis labels
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DrawText("1", (int)start.X - 8, (int)start.Y, 6, Color.Gray);
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DrawText("0", (int)start.X - 8, (int)start.Y + (int)start.Height / 2 - 6, 6, Color.Gray);
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DrawText("-1", (int)start.X - 12, (int)start.Y + (int)start.Height - 8, 6, Color.Gray);
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DrawText("0", (int)start.X - 2, (int)start.Y + (int)start.Height + 4, 6, Color.Gray);
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DrawText("360", (int)start.X + (int)start.Width - 8, (int)start.Y + (int)start.Height + 4, 6, Color.Gray);
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// Sine (red - vertical)
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DrawLineEx(new Vector2(center.X, center.Y), new Vector2(center.X, point.Y), 2.0f, Color.Red);
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DrawLineDashed(new Vector2(point.X, center.Y), new Vector2(point.X, point.Y), 10, 4, Color.Red);
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DrawText($"Sine {sinRad:0.00}", 640, 190, 6, Color.Red);
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DrawCircleV(new Vector2(start.X + (angle / 360.0f) * start.Width, start.Y + ((-sinRad + 1) * start.Height / 2.0f)), 4.0f, Color.Red);
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fixed (Vector2* p = sinePoints) DrawSplineLinear(p, WAVE_POINTS, 1.0f, Color.Red);
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// Cosine (blue - horizontal)
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DrawLineEx(new Vector2(center.X, center.Y), new Vector2(point.X, center.Y), 2.0f, Color.Blue);
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DrawLineDashed(new Vector2(center.X, point.Y), new Vector2(point.X, point.Y), 10, 4, Color.Blue);
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DrawText($"Cosine {cosRad:0.00}", 640, 210, 6, Color.Blue);
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DrawCircleV(new Vector2(start.X + (angle / 360.0f) * start.Width, start.Y + ((-cosRad + 1) * start.Height / 2.0f)), 4.0f, Color.Blue);
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fixed (Vector2* p = cosPoints) DrawSplineLinear(p, WAVE_POINTS, 1.0f, Color.Blue);
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// Tangent (purple)
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DrawLineEx(new Vector2(limitMax.X, center.Y), new Vector2(limitMax.X, tangentPoint.Y), 2.0f, Color.Purple);
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DrawLineDashed(center, tangentPoint, 10, 4, Color.Purple);
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DrawText($"Tangent {tangent:0.00}", 640, 230, 6, Color.Purple);
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// Cotangent (orange)
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DrawText($"Cotangent {cotangent:0.00}", 640, 250, 6, Color.Orange);
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// Complementary angle (beige)
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DrawCircleSectorLines(center, radius * 0.6f, -angle, -90.0f, 36, Color.Beige);
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DrawText($"Complementary {complementary:0}°", 640, 150, 6, Color.Beige);
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// Supplementary angle (darkblue)
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DrawCircleSectorLines(center, radius * 0.5f, -angle, -180.0f, 36, Color.DarkBlue);
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DrawText($"Supplementary {supplementary:0}°", 640, 130, 6, Color.DarkBlue);
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// Explementary angle (pink)
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DrawCircleSectorLines(center, radius * 0.4f, -angle, -360.0f, 36, Color.Pink);
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DrawText($"Explementary {explementary:0}°", 640, 170, 6, Color.Pink);
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// Current angle - arc (lime), radius (black), endpoint (black)
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DrawCircleSectorLines(center, radius * 0.7f, -angle, 0.0f, 36, Color.Lime);
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DrawLineEx(new Vector2(center.X, center.Y), point, 2.0f, Color.Black);
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DrawCircleV(point, 4.0f, Color.Black);
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// Draw GUI controls
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// NOTE: raygui is not bound in raylib-cs, so the Pause toggle and Angle slider
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// are unavailable; the angle animates continuously.
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//------------------------------------------------------------------------------
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/*
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GuiSetStyle(LABEL, TEXT_COLOR_NORMAL, ColorToInt(GRAY));
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GuiToggle((Rectangle){ 640, 70, 120, 20}, TextFormat("Pause"), &pause);
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GuiSetStyle(LABEL, TEXT_COLOR_NORMAL, ColorToInt(LIME));
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GuiSliderBar((Rectangle){ 640, 40, 120, 20}, "Angle", TextFormat("%.0f°", angle), &angle, 0.0f, 360.0f);
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// Angle values panel
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GuiGroupBox((Rectangle){ 620, 110, 140, 170}, "Angle Values");
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*/
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//------------------------------------------------------------------------------
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DrawFPS(10, 10);
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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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SetConfigFlags(ConfigFlags.Msaa4xHint);
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InitWindow(screenWidth, screenHeight, "raylib [shapes] example - math sine cosine");
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SetTargetFPS(60); // Set our game to run at 60 frames-per-second
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//--------------------------------------------------------------------------------------
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var game = new MathSineCosine();
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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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