ccg simple double linked list IMPROVED

// glfw_30.cpp : Defines the entry point for the console application.
//  http://www.glfw.org/docs/latest/quick.html

#include "stdafx.h"
#include <time.h>
#define _USE_MATH_DEFINES
#include <cmath>
#include <stdio.h>
#include <iostream>

#define SCREEN_WIDTH 700
#define SCREEN_HEIGHT 500

#define G_CONST 9.78

using namespace std;

float t;

GLdouble A, B, C, D;

float delta_pos(float velocity, float acceleration);

class system;
class body;
class block;
class cargo;
class pendulum;





class body {
public:
    char *name;
    int type, num, mass;
    body* up;
    body* down;
    body* right;
    body* left;

    void set(int, int, int, float, float);
    void draw();

private:
    float curr_x, curr_y;
    float init_x, init_y;
    float center_x, center_y;
    int h, w;


};

void body::set(int num, int type, int mass, float pos_x, float pos_y) {
    this->init_x = pos_x;
    this->init_y = pos_y;

    this->curr_x = pos_x;
    this->curr_y = pos_y;

    this->type = type;
    this->num = num;
    this->mass = mass;

    this->up = NULL;
    this->down = NULL;
    this->right = NULL;
    this->left = NULL;

    this->h = 20;
    this->w = 30;
}

void body::draw() {
    float pos_x = this->curr_x;
    float pos_y = this->curr_y;
    glBegin(GL_POLYGON);
    glColor3f(0, 0, 1);
    glVertex2i(pos_x, pos_y);
    glVertex2i(pos_x + this->w, pos_y);
    glVertex2i(pos_x + this->w, pos_y + this->h);
    glVertex2i(pos_x, pos_y + this->h);
    glEnd();
}






class system {
public:
    char *name;
    int el_num;
    int c_num, b_num;

    void draw_all();
    void add_elem(body*);

private:


};

void system::draw_all() {
    int i;
    for (i = 0; i < this->el_num; i++) {

    }
}

void system::add_elem(body* elem) {

}

/*

class block {
public:
char *name;
int ord_num;
block* left_block;
block* right_block;
cargo* left_cargo;
cargo* right_cargo;

void init();
void add_right_block(block*);
void add_left_block(block*);
void add_right_cargo(cargo*);
void add_left_cargo(cargo*);

block(int n, float pos_x, float pos_y) {
this->ord_num = n;
this->curr_x = pos_x;
this->curr_y = pos_y;
}

private:
float curr_x, curr_y;

void draw(float, float);
};

void block::draw(float pos_x, float pos_y) {
glBegin(GL_POLYGON);
glColor3f(0, 0, 1);
glVertex2i(pos_x, pos_y);
glVertex2i(pos_x + 20, pos_y);
glVertex2i(pos_x + 20, pos_y + 20);
glVertex2i(pos_x, pos_y + 20);
glEnd();
}

void block::init() {
float pos_x = this->curr_x;
float pos_y = this->curr_y;

this->draw(pos_x, pos_y);
}

void block::add_right_block(block* b) {
this->right_block = b;
b->left_block = this;
}

void block::add_left_block(block* b) {
this->left_block = b;
b->right_block = this;
}


*/

float delta_pos(float velocity, float acceleration);



class block {
public:
    char *name;
    int mass;

    void grav();
    void init();

    block(float pos_x, float pos_y) {
        this->init_x = pos_x;
        this->init_y = pos_y;

        this->curr_x = pos_x;
        this->curr_y = pos_y;

        this->visibility = true;
    }

private:
    float init_x, init_y;
    float curr_x, curr_y;
    bool visibility;

    void draw(float pos_x, float pos_y);
};

void block::draw(float pos_x, float pos_y) {
    glBegin(GL_POLYGON);
    glColor3f(1, 0, 0);
    glVertex2i(pos_x, pos_y);
    glVertex2i(pos_x + 20, pos_y);
    glVertex2i(pos_x + 20, pos_y + 20);
    glVertex2i(pos_x, pos_y + 20);
    glEnd();
}

void block::grav() {
    if (this->curr_y > 0) {

        float pos_x = this->curr_x + delta_pos(0, 0);
        float pos_y = this->curr_y - delta_pos(-2, G_CONST);

        this->curr_x = pos_x;
        this->curr_y = pos_y;

    }
    else {
        this->curr_y = 0;
        this->visibility = false;
    }

    this->draw(this->curr_x, this->curr_y);

    printf("x:%f, y:%f\n", this->curr_x, this->curr_y);
}

void block::init() {
    float pos_x = this->init_x;
    float pos_y = this->init_y;

    this->draw(pos_x, pos_y);
}


float delta_pos(float velocity, float acceleration) {
    //s = s0 + v*t + (a*t^2)/2
    float delta = velocity * t + (acceleration * t * t) / 2;
    printf("delta=%f\n", delta);

    t += 0.0001;

    return delta;
}




class cargo {
public:
    char *name;
    int ord_num;
    int mass;
    int move_direction;
    block* left_block;
    block* right_block;
    cargo* above_cargo;
    cargo* below_cargo;

    void grav(bool);
    void init();
    void add_right_block(block*);
    void add_left_block(block*);
    void add_above_cargo(cargo*);
    void add_below_cargo(cargo*);

    cargo(int n, float pos_x, float pos_y) {
        this->ord_num = n;

        this->init_x = pos_x;
        this->init_y = pos_y;

        this->curr_x = pos_x;
        this->curr_y = pos_y;

        this->velo_x = 0;
        this->velo_y = 0;

        if (this->velo_y == 0) {
            this->move_direction = -1;
        }
    }

private:
    float init_x, init_y;
    float curr_x, curr_y;
    float velo_x, velo_y;

    void draw(float, float);
};

void cargo::draw(float pos_x, float pos_y) {
    glBegin(GL_POLYGON);
    glColor3f(0, 1, 0);
    glVertex2i(pos_x, pos_y);
    glVertex2i(pos_x + 25, pos_y);
    glVertex2i(pos_x + 25, pos_y + 25);
    glVertex2i(pos_x, pos_y + 25);
    glEnd();
}

void cargo::grav(bool fall) {
    if (fall) {

        float pos_y;

        if (this->curr_y <= 0) {

            this->curr_y = 0;

            this->velo_y = sqrt(2 * G_CONST * this->init_y) * 0.8;

            this->move_direction = 1;

        }

        if (this->curr_y >= 0) {

            if (this->move_direction < 0) {

                float pos_y = (G_CONST * t * t) / 2;
                this->curr_y -= pos_y;

            }

            if (this->move_direction > 0) {

                float pos_y = this->velo_y * t - (G_CONST * t * t) / 2;
                this->curr_y += pos_y;

            }

        }
    }

    this->draw(this->curr_x, this->curr_y);

    t += 0.001;

    printf("x:%f, y:%f, v=%f\n", this->curr_x, this->curr_y, this->velo_y);
}

void cargo::init() {
    float pos_x = this->init_x;
    float pos_y = this->init_y;

    this->draw(pos_x, pos_y);
}






/*
typedef struct node {
    int info;
    node* prev_left;
    node* next_right;
    node* above;
    node* below;

    body* body;

};*/



struct Node
{
    int value;
    Node *next_r, *prev_l;
    Node(int y) { value = y; next_r = prev_l = NULL;}
};

class dll {
public:

    void append_front(int);
    void append_back(int);
    void display_forward();
    void display_backward();
    void destroy_list();

    dll() { front = NULL; back = NULL; }
    ~dll(){ destroy_list(); }

private:
    Node *front;
    Node *back;

};

void dll::append_front(int x) {

    Node *n = new Node(x);

    if (front == NULL) {
        front = n;
        back = n;
    } else {
        front->prev_l = n;
        n->next_r = front;
        front = n;
    }
    cout << "appended in fornt" << endl;
}

void dll::append_back(int x) {

    Node *n = new Node(x);

    if (back == NULL) {
        front = n;
        back = n;
    } else {
        back->next_r = n;
        n->prev_l = back;
        back = n;
    }
    cout << "appended to back" << endl;
}

void dll::display_forward() {
    Node *temp = front;

    cout << "\n\nNodes in forward order:" << endl;

    while (temp != NULL) {
        cout << temp->value << "   ";
        temp = temp->next_r;
    }
}

void dll::display_backward() {
    Node *temp = back;

    cout << "\n\nNodes in reverse order :" << endl;

    while (temp != NULL) {
        cout << temp->value << "   ";
        temp = temp->prev_l;
    }
}

void dll::destroy_list() {
    Node *T = back;

    while (T != NULL) {
        Node *T2 = T;
        T = T->prev_l;
        delete T2;
    }

    front = NULL;
    back = NULL;
}



static void cursor_callback(GLFWwindow* window, double x, double y)
{

}

static void mouse_callback(GLFWwindow* window, int button, int action, int mods)
{
    if (button == GLFW_MOUSE_BUTTON_RIGHT)
    {
        if (action == GLFW_PRESS) glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_HIDDEN);
        if (action == GLFW_RELEASE) glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_NORMAL);
    }

    if (button == GLFW_MOUSE_BUTTON_LEFT)
    {

    }
}

static void resize_callback(GLFWwindow* window, int width, int height)
{
    //      windowWidth = width;
    //      windowHeight = height;

    glViewport(0, 0, width, height);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glOrtho(0.0, (GLdouble)width, 0.0, (GLdouble)height, -1, 1);

    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();

    A = width / 4.0;
    B = 0.0;
    C = D = height / 2.0;

    printf("Reshape occured\n");
}

static void keyboard_callback(GLFWwindow* window, int key, int scancode, int action, int mods)
{
    if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
        glfwSetWindowShouldClose(window, GL_TRUE);
    //if (GLFW_KEY_T == key && action == GLFW_PRESS) { gravity(); }
}

static void error_callback(int error, const char* description)
{
    fputs(description, stderr);
}




int main(int argc, _TCHAR* argv[])
{
    if (!glfwInit()) {
        printf("glfwInit failed\n");
        return -1;
    }

    glfwSetErrorCallback(error_callback);

    GLFWwindow* window;

    //      glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 1);
    //      glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 2);
    //glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_COMPAT_PROFILE);
    window = glfwCreateWindow(SCREEN_WIDTH, SCREEN_HEIGHT, "Anthony's Porject", NULL, NULL);
    if (window == NULL) {
        printf("glfwOpenWindow failed.\n");
        glfwTerminate();
        return -2;
    }

    int attrib;
    attrib = glfwGetWindowAttrib(window, GLFW_CONTEXT_VERSION_MAJOR);
    attrib = glfwGetWindowAttrib(window, GLFW_CONTEXT_VERSION_MINOR);
    attrib = glfwGetWindowAttrib(window, GLFW_OPENGL_PROFILE);

    glfwMakeContextCurrent(window);

    glfwSetKeyCallback(window, keyboard_callback);
    glfwSetFramebufferSizeCallback(window, resize_callback);
    glfwSetMouseButtonCallback(window, mouse_callback);
    glfwSetCursorPosCallback(window, cursor_callback);
    resize_callback(window, SCREEN_WIDTH, SCREEN_HEIGHT);

    GLfloat phi = 0, center = 0;
    int i;







    t = 0;


    while (!glfwWindowShouldClose(window))
    {
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

        if (glfwGetKey(window, GLFW_KEY_UP) == GLFW_PRESS) {
            i += 5;
        }
        if (glfwGetKey(window, GLFW_KEY_DOWN) == GLFW_PRESS) {
            i -= 5;
        }
        if (glfwGetKey(window, GLFW_KEY_RIGHT) == GLFW_PRESS) {
            phi += 0.3;
        }
        if (glfwGetKey(window, GLFW_KEY_LEFT) == GLFW_PRESS) {
            phi -= 0.3;
        }






        glfwSwapBuffers(window);
        glfwPollEvents();
        //glfwWaitEvents();
    }

    glfwDestroyWindow(window);
    glfwTerminate();

    return 0;
}