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draft: [examples] Added shapes_math_sine_cosine

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Jopestpe 2025-10-10 17:00:11 -03:00 committed by GitHub
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/*******************************************************************************************
*
* raylib [shapes] example - math sine cosine
*
* Example complexity rating: [★★☆☆] 2/4
*
* Example originally created with raylib 5.6-dev, last time updated with raylib 5.6-dev
*
* Example contributed by Jopestpe (@jopestpe)
*
* 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) 2018-2025 Jopestpe (@jopestpe)
*
********************************************************************************************/
#include "raylib.h"
#include <math.h>
#include "raymath.h"
#define RAYGUI_IMPLEMENTATION
#include "raygui.h" // Required for GUI controls
//------------------------------------------------------------------------------------
// Program main entry point
//------------------------------------------------------------------------------------
int main(void)
{
// Initialization
//--------------------------------------------------------------------------------------
const int screenWidth = 800;
const int screenHeight = 450;
SetConfigFlags(FLAG_MSAA_4X_HINT);
InitWindow(screenWidth, screenHeight, "raylib [shapes] example - math sine cosine");
const int wavePoints = 36;
Vector2 sinePoints[wavePoints];
Vector2 cosPoints[wavePoints];
Vector2 center = { (screenWidth/2.0f) - 30.f, screenHeight/2.0f };
Rectangle start = { 20.f, screenHeight - 120.f , 200.0f, 100.0f};
float radius = 130.0f;
float angle = 0.0f;
bool pause = false;
for (int i = 0; i < wavePoints; i++)
{
float t = i/(float)(wavePoints - 1);
float angleDeg = t*360.0f;
float s = sinf(angleDeg*DEG2RAD);
float c = cosf(angleDeg*DEG2RAD);
sinePoints[i] = (Vector2){ start.x + t*start.width, start.y + start.height/2.0f - s*(start.height/2.0f) };
cosPoints[i] = (Vector2){ start.x + t*start.width, start.y + start.height/2.0f - c*(start.height/2.0f) };
}
SetTargetFPS(60); // Set our game to run at 60 frames-per-second
//--------------------------------------------------------------------------------------
// Main game loop
while (!WindowShouldClose()) // Detect window close button or ESC key
{
// Update
//----------------------------------------------------------------------------------
float angleRad = angle*DEG2RAD;
float cosRad = cosf(angleRad);
float sinRad = sinf(angleRad);
Vector2 point = { center.x + cosRad*radius, center.y - sinRad*radius };
Vector2 limitMin = { center.x - radius, center.y - radius };
Vector2 limitMax = { center.x + radius, center.y + radius };
float complementary = 90.0f - angle;
float supplementary = 180.0f - angle;
float replementary = 360.0f - angle;
float tangent = Clamp(tanf(angleRad), -10.0f, 10.0f);
float cotangent = Clamp(fabs(tangent) < 0.001f ? 0.0f : 1.0f/tangent, -radius, radius);
Vector2 tangentPoint = { center.x + radius, center.y - tangent*radius };
Vector2 cotangentPoint = { center.x + cotangent*radius, center.y - radius };
angle = Wrap(angle + (!pause ? 1.0f : 0.0f), 0.0f, 360.0f);
//----------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(RAYWHITE);
DrawCircleLinesV(center, radius, GRAY);
DrawCircleSectorLines(center, radius/2 , -angle, -360.f , 36.0f, PINK);
DrawCircleSectorLines(center, radius/2 , -angle, -180.f , 36.0f, DARKBLUE);
DrawCircleSectorLines(center, radius/2 , -angle, -90.f , 36.0f, BEIGE);
DrawCircleSectorLines(center, radius/2 , -angle, 0.f, 36.0f, LIME);
DrawLineEx((Vector2){ center.x, limitMin.y }, (Vector2){ center.x, limitMax.y }, 1.0f, GRAY);
DrawLineEx((Vector2){ limitMin.x, center.y }, (Vector2){ limitMax.x, center.y }, 1.f, GRAY);
DrawLineEx((Vector2){ center.x, center.y }, (Vector2){ center.x, point.y }, 2.0f, RED);
DrawLineDashed((Vector2){ point.x, center.y }, (Vector2){ point.x, point.y }, 10.0f, 4.0f, RED);
DrawLineEx((Vector2){ center.x, center.y }, (Vector2){ point.x, center.y }, 2.0f, BLUE);
DrawLineDashed((Vector2){ center.x , point.y }, (Vector2){ point.x, point.y }, 10.0f, 4.0f, BLUE);
DrawLineEx((Vector2){ center.x , limitMin.y }, (Vector2){ cotangentPoint.x, limitMin.y }, 2.0f, ORANGE);
DrawLineEx((Vector2){ limitMax.x , center.y }, (Vector2){ limitMax.x, tangentPoint.y }, 2.0f, PURPLE);
DrawLineDashed(center, cotangentPoint, 10.0f, 4.0f, ORANGE);
DrawLineDashed(center, tangentPoint, 10.0f, 4.0f, PURPLE);
DrawLineEx((Vector2){ center.x , center.y }, point, 2.0f, BLACK);
DrawCircleV(point, 4.0f, BLACK);
DrawLineEx((Vector2){ start.x , start.y }, (Vector2){ start.x , start.y + start.height }, 2.0f, GRAY);
DrawLineEx((Vector2){ start.x + start.width, start.y }, (Vector2){ start.x + start.width, start.y + start.height }, 2.0f, GRAY);
DrawLineEx((Vector2){ start.x, start.y + start.height/2 }, (Vector2){ start.x + start.width, start.y + start.height/2 }, 2.0f, GRAY);
DrawCircleV((Vector2){ start.x + (angle/360.0f)*start.width, start.y + ((-sinRad + 1)*start.height / 2.0f) }, 4.0f, RED);
DrawCircleV((Vector2){ start.x + (angle/360.0f)*start.width, start.y + ((-cosRad + 1)*start.height / 2.0f) }, 4.0f, BLUE);
DrawSplineLinear(sinePoints, wavePoints, 1.0f, RED);
DrawSplineLinear(cosPoints, wavePoints, 1.0f, BLUE);
DrawLine(580, 0, 580, GetScreenHeight(), (Color){ 218, 218, 218, 255 });
DrawRectangle(580, 0, GetScreenWidth(), GetScreenHeight(), (Color){ 232, 232, 232, 255 });
// Draw GUI controls
//------------------------------------------------------------------------------
GuiSetStyle(LABEL, TEXT_COLOR_NORMAL, ColorToInt(GRAY));
GuiToggle((Rectangle){ 640, 100, 120, 20}, TextFormat("Pause"), &pause);
GuiSetStyle(LABEL, TEXT_COLOR_NORMAL, ColorToInt(LIME));
GuiSliderBar((Rectangle){ 640, 70, 120, 20}, "Angle", TextFormat("%.0f°", angle), &angle, 0.0f, 360.f);
DrawText(TextFormat("Supplementary %0.f°",supplementary), 640, 130, 6, DARKBLUE);
DrawText(TextFormat("Complementary %0.f°",complementary), 640, 150, 6, BEIGE);
DrawText(TextFormat("Replementary %0.f°",replementary), 640, 170, 6, PINK);
DrawText(TextFormat("Sine %.2f", sinRad), 640, 190, 6, RED);
DrawText(TextFormat("Cosine %.2f", cosRad), 640, 210, 6, BLUE);
DrawText(TextFormat("Tangent %.2f", tangent), 640, 230, 6, PURPLE);
DrawText(TextFormat("Cotangent %.2f", cotangent), 640, 250, 6, ORANGE);
DrawText("1", start.x - 8, start.y, 6, GRAY);
DrawText("0", start.x - 8, start.y + start.height/2 - 6, 6, GRAY);
DrawText("-1", start.x - 12, start.y + start.height - 8, 6, GRAY);
DrawText("0", start.x - 2, start.y + start.height + 4, 6, GRAY);
DrawText("360", start.x + start.width - 8, start.y + start.height + 4, 6, GRAY);
//------------------------------------------------------------------------------
DrawFPS(10, 10);
EndDrawing();
//----------------------------------------------------------------------------------
}
// De-Initialization
//--------------------------------------------------------------------------------------
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
return 0;
}