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/*******************************************************************************************
*
* raylib [shapes] example - following eyes
*
* Example originally created with raylib 2.5, last time updated with raylib 2.5
*
* 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) 2013-2024 Ramon Santamaria (@raysan5)
*
********************************************************************************************/
#include "raylib.h"
#include <math.h> // Required for: atan2f()
//------------------------------------------------------------------------------------
// Program main entry point
//------------------------------------------------------------------------------------
int main(void)
{
// Initialization
//--------------------------------------------------------------------------------------
const int screenWidth = 800;
const int screenHeight = 450;
InitWindow(screenWidth, screenHeight, "raylib [shapes] example - following eyes");
Vector2 scleraLeftPosition = { GetScreenWidth()/2.0f - 100.0f, GetScreenHeight()/2.0f };
Vector2 scleraRightPosition = { GetScreenWidth()/2.0f + 100.0f, GetScreenHeight()/2.0f };
float scleraRadius = 80;
Vector2 irisLeftPosition = { GetScreenWidth()/2.0f - 100.0f, GetScreenHeight()/2.0f };
Vector2 irisRightPosition = { GetScreenWidth()/2.0f + 100.0f, GetScreenHeight()/2.0f };
float irisRadius = 24;
float angle = 0.0f;
float dx = 0.0f, dy = 0.0f, dxx = 0.0f, dyy = 0.0f;
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
//----------------------------------------------------------------------------------
irisLeftPosition = GetMousePosition();
irisRightPosition = GetMousePosition();
// Check not inside the left eye sclera
if (!CheckCollisionPointCircle(irisLeftPosition, scleraLeftPosition, scleraRadius - irisRadius))
{
dx = irisLeftPosition.x - scleraLeftPosition.x;
dy = irisLeftPosition.y - scleraLeftPosition.y;
angle = atan2f(dy, dx);
dxx = (scleraRadius - irisRadius)*cosf(angle);
dyy = (scleraRadius - irisRadius)*sinf(angle);
irisLeftPosition.x = scleraLeftPosition.x + dxx;
irisLeftPosition.y = scleraLeftPosition.y + dyy;
}
// Check not inside the right eye sclera
if (!CheckCollisionPointCircle(irisRightPosition, scleraRightPosition, scleraRadius - irisRadius))
{
dx = irisRightPosition.x - scleraRightPosition.x;
dy = irisRightPosition.y - scleraRightPosition.y;
angle = atan2f(dy, dx);
dxx = (scleraRadius - irisRadius)*cosf(angle);
dyy = (scleraRadius - irisRadius)*sinf(angle);
irisRightPosition.x = scleraRightPosition.x + dxx;
irisRightPosition.y = scleraRightPosition.y + dyy;
}
//----------------------------------------------------------------------------------
// Draw
//----------------------------------------------------------------------------------
BeginDrawing();
ClearBackground(RAYWHITE);
DrawCircleV(scleraLeftPosition, scleraRadius, LIGHTGRAY);
DrawCircleV(irisLeftPosition, irisRadius, BROWN);
DrawCircleV(irisLeftPosition, 10, BLACK);
DrawCircleV(scleraRightPosition, scleraRadius, LIGHTGRAY);
DrawCircleV(irisRightPosition, irisRadius, DARKGREEN);
DrawCircleV(irisRightPosition, 10, BLACK);
DrawFPS(10, 10);
EndDrawing();
//----------------------------------------------------------------------------------
}
// De-Initialization
//--------------------------------------------------------------------------------------
CloseWindow(); // Close window and OpenGL context
//--------------------------------------------------------------------------------------
return 0;
}
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