Bird flip wing

#include <iostream>

#include <cmath>

// GLEW

#define GLEW_STATIC

#include <GL/glew.h>

// GLFW

#include <GLFW/glfw3.h>

// Window dimensions

const GLuint WIDTH = 800, HEIGHT = 600;

// Bird position and speed

float birdX = 0.0f;

float birdY = 0.0f;

float birdSpeed = 1.0f; // Use deltaTime for actual speed

float wingFlapTimer = 0.0f;

float wingFlapSpeed = 5.0f;

bool isMoving = false;

static void Initialize(void);

void processInput(GLFWwindow* window, float deltaTime)

{

    float speed = birdSpeed * deltaTime;

    isMoving = false;

    if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)

        glfwSetWindowShouldClose(window, true);

    if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS && birdY + 0.3f < 1.0f) {

        birdY += speed;

        isMoving = true;

    }

    if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS && birdY - 0.2f > -1.0f) {

        birdY -= speed;

        isMoving = true;

    }

    if (glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS && birdX - 0.4f > -1.0f) {

        birdX -= speed;

        isMoving = true;

    }

    if (glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS && birdX + 0.3f < 1.0f) {

        birdX += speed;

        isMoving = true;

    }

}

void RenderBird()

{

    int numSegments = 100;

    // Head

    float headX = birdX + 0.1f, headY = birdY + 0.05f;

    float headRadius = 0.1f;

    glColor3f(0.0f, 0.0f, 0.0f); // Black

    glBegin(GL_TRIANGLE_FAN);

    glVertex2f(headX, headY);

    for (int i = 0; i <= numSegments; i++) {

        float angle = 2.0f * 3.14159f * i / numSegments;

        float x = headRadius * cos(angle);

        float y = headRadius * sin(angle);

        glVertex2f(headX + x, headY + y);

    }

    glEnd();

    // Eye

    float eyeX = birdX + 0.14f, eyeY = birdY + 0.05f;

    float eyeRadius = 0.02f;

    glColor3f(1.0f, 1.0f, 1.0f); // White

    glBegin(GL_TRIANGLE_FAN);

    glVertex2f(eyeX, eyeY);

    for (int i = 0; i <= numSegments; i++) {

        float angle = 2.0f * 3.14159f * i / numSegments;

        float x = eyeRadius * cos(angle);

        float y = eyeRadius * sin(angle);

        glVertex2f(eyeX + x, eyeY + y);

    }

    glEnd();

    // Body

    glColor3f(0.0f, 0.0f, 0.0f);

    glBegin(GL_TRIANGLES);

    glVertex2f(birdX - 0.2f, birdY - 0.2f); // bottom left

    glVertex2f(birdX + 0.1f, birdY - 0.05f); // bottom right

    glVertex2f(birdX, birdY + 0.08f);        // top

    glEnd();

    // Wing (flaps up/down)

    glBegin(GL_TRIANGLES);

    if (isMoving) 

    {

        wingFlapTimer += 0.05f * wingFlapSpeed;

        if (wingFlapTimer > 2.0f * 3.14159f)

            wingFlapTimer -= 2.0f * 3.14159f;

        float t = (sin(wingFlapTimer) + 1.0f) / 2.0f; // cycles from 0 to 1

        // Position 1: original wing flap 

        float x1[3] = { birdX - 0.15f, birdX + 0.01f, birdX - 0.05f };

        float y1[3] = { birdY + 0.25f, birdY + 0.08f, birdY - 0.1f };

        // Position 2: wing down 

        float x2[3] = { birdX - 0.15f, birdX + 0.01f, birdX - 0.05f };

        float y2[3] = { birdY - 0.25f, birdY - 0.08f, birdY - 0.1f };

        for (int i = 0; i < 3; ++i) 

        {

            float x = x1[i] * (1 - t) + x2[i] * t;

            float y = y1[i] * (1 - t) + y2[i] * t;

            glVertex2f(x, y);

        }

    }

    else 

    {

        // Not moving: wing stays fixed in the original position (up)

        glVertex2f(birdX - 0.15f, birdY + 0.25f);

        glVertex2f(birdX + 0.01f, birdY + 0.08f);

        glVertex2f(birdX - 0.05f, birdY - 0.1f);

    }

    glEnd();

    // Beak

    glBegin(GL_TRIANGLES);

    glVertex2f(birdX + 0.18f, birdY + 0.06f);

    glVertex2f(birdX + 0.3f, birdY + 0.05f);

    glVertex2f(birdX + 0.18f, birdY + 0.02f);

    glEnd();

    // Belly

    glBegin(GL_TRIANGLE_FAN);

    glVertex2f(birdX - 0.02f, birdY - 0.08f); // Center of fan

    float angleOffset = -145.0f * 3.14159f / 180.0f; // rotation offset

    for (int i = 0; i <= 10; ++i)

    {

        float angle = angleOffset + (3.14159f * i / 10);

        float x = 0.15f * cos(angle);  // stretch X

        float y = 0.1f * sin(angle);   // keep Y size

        glVertex2f(birdX - 0.02f + x, birdY - 0.08f + y);

    }

    glEnd();

}

int main()

{

    // Initialize GLFW

    glfwInit();

    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);

    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 1);

    glfwWindowHint(GLFW_OPENGL_ANY_PROFILE, GLFW_OPENGL_ANY_PROFILE);

    GLFWwindow* window = glfwCreateWindow(WIDTH, HEIGHT, "Bird Movement", nullptr, nullptr);

    glfwMakeContextCurrent(window);

    // Set up orthographic projection

    glMatrixMode(GL_PROJECTION);

    glLoadIdentity();

    glOrtho(-1, 1, -1, 1, -1, 1); // Coordinate system from -1 to 1

    glMatrixMode(GL_MODELVIEW);

    glLoadIdentity();

    float lastFrame = glfwGetTime();

    // Game loop

    while (!glfwWindowShouldClose(window))

    {

        float currentFrame = glfwGetTime();

        float deltaTime = currentFrame - lastFrame;

        lastFrame = currentFrame;

        processInput(window, deltaTime);

        Initialize();

        RenderBird();

        glfwSwapBuffers(window);

        glfwPollEvents();

    }

    glfwTerminate();

    return EXIT_SUCCESS;

}

static void Initialize(void)

{

    glClearColor(1.0f, 0.0f, 0.0f, 1.0f); 

    glClear(GL_COLOR_BUFFER_BIT);

}