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raylib-src
peilaus alkaen https://github.com/raysan5/raylib


								/*******************************************************************************************

								*

								*   raylib [shapes] example - math sine cosine

								*

								*   Example complexity rating: [★☆☆☆] 1/4

								*

								*   Example originally created with raylib 5.6, last time updated with raylib 5.6

								*

								*   Example contributed by Midiphony (@midiphony) 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) 2025-2025 Zero (@zerohorsepower)

								*

								********************************************************************************************/


								#include "raylib.h"

								#include "raymath.h" // Required for: Vector2 operations and Clamp()

								#include <stdlib.h> // Required for: malloc(), free()

								#include <math.h> // Required for: cosf(), sinf()


								//------------------------------------------------------------------------------------

								// Program main entry point

								//------------------------------------------------------------------------------------

								int main(void)

								{

								    // Initialization

								    //--------------------------------------------------------------------------------------

								    const Color cosineColor = RED;

								    const Color sineColor = ORANGE;

								    const int pointsSize = 6;

								    const int lineThickness = 2;


								    const int screenWidth = 800;

								    const int screenHeight = 450;


								    // Circle

								    const int circleX = screenWidth/4 - 20;

								    const int circleY = screenHeight/2;

								    const Vector2 circlePosition = { circleX, circleY };

								    const int circleRadius = 140;

								    const int circleLeft = circleX - circleRadius;

								    const int circleRight = circleX + circleRadius;

								    const int circleTop = circleY - circleRadius;

								    const int circleBottom = circleY + circleRadius;


								    const int circleTextFontSize = 20;


								    // Graph

								    const int graphLeft = screenWidth/2;

								    const int graphRight = 750;

								    const int graphHeight = 200;

								    const int graphHalfHeight = graphHeight/2;

								    const int graphYMiddle = screenHeight/2;

								    const int graphTop = graphYMiddle - graphHalfHeight;

								    const int graphBottom = graphYMiddle + graphHalfHeight;

								    const int graphWidth = graphRight - graphLeft;


								    const int graphTextFontSize = 20;

								    const int graphTextPadding = 10;


								    Vector2* cosineCurvePoints = (Vector2*)malloc(graphWidth*sizeof(Vector2)); // Points array

								    Vector2* sineCurvePoints = (Vector2*)malloc(graphWidth*sizeof(Vector2)); // Points array


								    // Initialize cosine curve

								    for (int x = 0; x < graphWidth; x++)

								    {

								        float y = -cosf(((float)x/graphWidth)*2.0*PI);

								        int yCoord = graphYMiddle + y*graphHalfHeight;

								        cosineCurvePoints[x] = (Vector2){ graphLeft + x, yCoord };

								    }


								    // Initialize sine curve

								    for (int x = 0; x < graphWidth; x++)

								    {

								        float y = sinf(((float)x/graphWidth)*2.0*PI);

								        int yCoord = graphYMiddle - y*graphHalfHeight;

								        sineCurvePoints[x] = (Vector2){ graphLeft + x, yCoord };

								    }


								    const int windowSplitX = ((circleX + circleRadius) + graphLeft)/2;


								    InitWindow(screenWidth, screenHeight, "raylib [shapes] example - math sine cosine");


								    const int circleTextMaxLength = MeasureText("-1.000", circleTextFontSize);

								    const int graphTextMaxLength = MeasureText("-1.000", graphTextFontSize);


								    SetTargetFPS(60);

								    //--------------------------------------------------------------------------------------


								    // Main game loop

								    while (!WindowShouldClose())    // Detect window close button or ESC key

								    {

								        // Update

								        //----------------------------------------------------------------------------------

								        Vector2 mousePosition = GetMousePosition();

								        float angleInDegrees = 0.0f;

								        float angle = 0;


								        if (mousePosition.x <= windowSplitX) // Calculate angle relative to the circle

								        {

								            angle = Vector2Angle(Vector2Subtract(mousePosition, circlePosition), (Vector2) { 1, 0 });

								            if (angle < 0.0f)

								            {

								                angle += 2*PI;

								            }

								        }

								        else // Calculate angle relative to the graph

								        {

								            angle = Clamp((mousePosition.x - graphLeft)*2*PI/graphWidth, 0.0f, 2*PI);

								        }


								        angleInDegrees = angle*RAD2DEG;


								        float cosine = cosf(angle);

								        float sine = sinf(angle);

								        int pointX = circleX + circleRadius*cosine;

								        int pointY = circleY - circleRadius*sine;


								        // Draw

								        //----------------------------------------------------------------------------------

								        BeginDrawing();


								        ClearBackground(RAYWHITE);


								        // Draw top angle label

								        DrawText(TextFormat("Angle:%.1f", angleInDegrees), 20, 20, 30, GRAY);


								        // Trigonometry circle

								        // --------------------

								        DrawRing(circlePosition, circleRadius - lineThickness/2, circleRadius + lineThickness/2, 0, 360, 0, GRAY); // 0 ring segment to let DrawRing choose a number of segments giving a smooth circle

								        DrawLineEx((Vector2) { circleLeft, circleY }, (Vector2) { circleRight, circleY }, lineThickness, GRAY);

								        DrawLineEx((Vector2) { circleX, circleTop }, (Vector2) { circleX, circleBottom }, lineThickness, GRAY);


								        DrawCircleSectorLines(circlePosition, circleRadius/3, 0, -angleInDegrees, 0, BLUE);


								        // Draw line to point

								        DrawLine(circleX, circleY, pointX, pointY, GRAY);


								        // Draw cosine point

								        DrawLineEx((Vector2) { circleX, circleY }, (Vector2) { pointX, circleY }, lineThickness, cosineColor);

								        DrawText(TextFormat("%.3f", cosine), ((pointX + circleX)/2) - circleTextMaxLength/2, circleY + 2, circleTextFontSize, cosineColor);

								        // Draw sine point

								        DrawLineEx((Vector2) { pointX, circleY }, (Vector2) { pointX, pointY }, lineThickness, sineColor);

								        DrawText(TextFormat("%.3f", sine), pointX + 5, (pointY + circleY)/2 - circleTextFontSize/2, circleTextFontSize, sineColor);


								        // Draw point

								        DrawCircle(pointX, pointY, pointsSize, BLACK);

								        // --------------------


								        // Window split

								        DrawLine(windowSplitX, 0, windowSplitX, screenHeight - 1, GRAY);


								        // Graph

								        // --------------------

								        // Draw graph borders

								        DrawLineEx((Vector2) { graphLeft, graphTop }, (Vector2) { graphLeft, graphBottom }, 2, GRAY);

								        DrawLineEx((Vector2) { graphRight, graphTop }, (Vector2) { graphRight, graphBottom }, 2, GRAY);

								        DrawLineEx((Vector2) { graphLeft, graphYMiddle }, (Vector2) { graphRight, graphYMiddle }, 2, GRAY);


								        // Draw graph outer texts

								        DrawText("1", graphLeft - graphTextPadding - MeasureText("1", graphTextFontSize), graphTop - graphTextFontSize/2, graphTextFontSize, GRAY);

								        DrawText("0", graphLeft - graphTextPadding - MeasureText("0", graphTextFontSize), graphYMiddle - graphTextFontSize/2, graphTextFontSize, GRAY);

								        DrawText("-1", graphLeft - graphTextPadding - MeasureText("-1", graphTextFontSize), graphBottom - graphTextFontSize/2, graphTextFontSize, GRAY);

								        DrawText("0", graphLeft - MeasureText("0", graphTextFontSize)/2, graphBottom + graphTextPadding/2, graphTextFontSize, GRAY);

								        DrawText("360", graphRight - MeasureText("360", graphTextFontSize)/2, graphBottom + graphTextPadding/2, graphTextFontSize, GRAY);


								        // Draw cosine curve

								        DrawSplineLinear(cosineCurvePoints, graphWidth, 2, cosineColor);

								        DrawText("cos", graphRight + graphTextPadding, cosineCurvePoints[graphWidth - 1].y - graphTextFontSize/2, graphTextFontSize, cosineColor);


								        // Draw sine curve

								        DrawSplineLinear(sineCurvePoints, graphWidth, 2, sineColor);

								        DrawText("sin", graphRight + graphTextPadding, sineCurvePoints[graphWidth - 1].y - graphTextFontSize/2, graphTextFontSize, sineColor);


								        // Draw graph progress line

								        int x = graphLeft + graphWidth*angleInDegrees/360.0f;

								        DrawLine(x, graphBottom, x, graphTop, BLUE);


								        // Draw cosine and sine points on graph

								        int cosineY = graphYMiddle - cosine*graphHalfHeight;

								        int sineY = graphYMiddle - sine*graphHalfHeight;

								        DrawCircle(x, cosineY, pointsSize, cosineColor);

								        DrawText(TextFormat("%.3f", cosine), x - circleTextMaxLength/2, cosineY - circleTextFontSize - 5, circleTextFontSize, cosineColor);

								        DrawCircle(x, sineY, pointsSize, sineColor);

								        DrawText(TextFormat("%.3f", sine), x - circleTextMaxLength/2, sineY + 8, circleTextFontSize, sineColor);

								        // --------------------


								        EndDrawing();

								        //----------------------------------------------------------------------------------

								    }


								    // De-Initialization

								    //--------------------------------------------------------------------------------------


								    free(cosineCurvePoints);

								    free(sineCurvePoints);


								    CloseWindow();        // Close window and OpenGL context

								    //--------------------------------------------------------------------------------------


								    return 0;

								}