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Falling parachuter

xCaldazar (16)
This is my first time using classes so I am having a bit of trouble. I don't know what these error messages I'm getting are trying to say. I have cleaned up a lot of my earlier errors, these few I'm just unsure about. I have got the program working one way. But we are supposed to use less lines of code in the main() part of the program. So I have tried to give the class more to do. I am really stuck so any little bit would help. I imagine there are still bugs to work out, I just want to figure out these error messages for now.

This is a screen shot of how it should work.
http://i27.photobucket.com/albums/c163/TaylorSanchez/cplusplus/parachuter.png
My errors are:
g++ parachutist_5.cpp -o para5 ccc_x11.cpp ccc_shap.cpp -L /usr/X11R6/lib -lX11
parachutist_5.cpp: In constructor ‘Parachutist::Parachutist(int, int, int)’:
parachutist_5.cpp:46: error: ‘speed’ was not declared in this scope
parachutist_5.cpp:47: error: invalid use of member (did you forget the ‘&’ ?)
parachutist_5.cpp: In member function ‘void Parachutist::move_closed(int, int)’:
parachutist_5.cpp:55: error: ‘speed’ was not declared in this scope
parachutist_5.cpp: In member function ‘void Parachutist::display()’:
parachutist_5.cpp:79: error: invalid use of member (did you forget the ‘&’ ?)
parachutist_5.cpp:82: error: invalid use of member (did you forget the ‘&’ ?)
ccc_x11.cpp: In function ‘int main(int, char**)’:
ccc_x11.cpp:429: warning: deprecated conversion from string constant to ‘char*’
ccc_x11.cpp:498: warning: deprecated conversion from string constant to ‘char*’

I figure a few are interconnected. Like the speed that reappears. I thought it was declared correctly, but I don't understand classes completely. We were given a skeleton to build from, which I trashed most of it since I didn't like the layout.

My code is:
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//Parachutist
//Taylor Sanchez
//This should be a class that you input speed of a plane and how many seconds to wait until pulling
// a parachute, from there it will simulate from there.

//Upon closer inspection of the directions, I think I need to change what type of inputs come from the main program.

#include "ccc_win.h"
using namespace std;
class Parachutist 
{
public:
  Parachutist();
  Parachutist(int, int, int);  
  void pull();      
  void move(int dx, int dy);
  void display();
private:
  Point man;
  int seconds;
  int y;
  int x;
  int dy;
  int dx;
  int r;
  void move_closed(int, int);
  void display_closed();
  void move_open(int,int);
  void display_open();
};
Parachutist::Parachutist()
{
    int pull = 6;           //seconds until parachute pulled
    int speed = 150;        //speed of plane jumped from
    int seconds = 0;  //constant              //seconds falling in program
    int dy = 0;       //constant              //change in y   (acceleration/deceleration to ground)
    int dx = 0;       //constant              //change in x   (drag factor)
    int x = 100;    
    int y = 950;
    man= Point (x,y);
    int r=10;
  
}
Parachutist::Parachutist(int s, int p, int height)
{
    speed = s;  //refer to main() currently is 150 ft/sec
    pull = p;   //refer to main() currently is after 8 sec
    y = height;
}

void Parachutist::move_closed(int dx, int dy)
{
      //p.move(dx,dy);
      dy = 32 * seconds;
      dx = speed;
                //line for if slowing down after jump, we assume he isnt //dx = dx - 5*seconds;
      if(dy > 174) {dy = 174;}
      y = y - dy;
      Message xy(Point (x,y), dx);
      cwin<<xy;   
      x = x + dx;
      seconds = seconds + 1;
}
void Parachutist::move_open(int dx, int dy)
{     
      dy = dy - (100 * seconds);
      dx = dx - 20;
      if(dx <= 0) {dx = 0;}
      if(dy <= 17) {dy = 17;}
      y = y - dy;
      Message xy(Point (x,y), dx);
      cwin<<xy;   
      x = x + dx;
      seconds = seconds + 1;
}

void Parachutist::display()
{
  if (seconds<pull)
    void move_closed(int,int);
    display_closed();
  if (seconds>=pull)
    void move_open(int,int);
    display_open();
}

void Parachutist::display_closed()
  {
  Point h(x,y);       //Center Point  //h for head
  Circle c(h,r);      //circle p
  cwin << c;
  //body 
  Point b1(x,y-r);                  //neck connection
  Point b2(x,y-(4*r));              //end of body  Body and head will be same size?
  cwin << Line(b1,b2);  
  //Legs
  Point l1(x+((0.5)*r),y-(5.5*r)); //trying to make proportional, again may need to do math seperately
  Point l2(x-((0.5)*r),y-(5.5*r)); //
  cwin << Line(b2,l1) << Line(b2,l2);  
  //Arms
  Point c1(x,y-(3*r));              // midpoint to connect arms
  Point a1(x+(r),y-(1.5*r));        //arm
  Point a2(x-(r),y-(1.5*r));        //arm
  cwin << Line (c1,a1) << Line (c1,a2);
  if (y>0){Parachutist::display();}
  }
void Parachutist::display_open()
  {
  Point h(x,y);       //Center Point  //h for head
  Circle c(h,r);      //circle p
  cwin << c;
  //body 
  Point b1(x,y-r);                  //neck connection
  Point b2(x,y-(4*r));              //end of body  Body and head will be same size?
  cwin << Line(b1,b2);
  //Legs
  Point l1(x+((0.5)*r),y-(5.5*r)); //trying to make proportional, again may need to do math seperately
  Point l2(x-((0.5)*r),y-(5.5*r)); //
  cwin << Line(b2,l1) << Line(b2,l2);
  //Arms
  Point c1(x,y-(3*r));              // midpoint to connect arms
  Point a1(x+(r),y-(1.5*r));        //arm
  Point a2(x-(r),y-(1.5*r));        //arm
  cwin << Line (c1,a1) << Line (c1,a2);
  //parachute
  Point c2(x,y-(2*r));                   //connection point for parachute
  Point s1(x-(3*r),y+(3*r));             //string
  Point s2(x+(3*r),y+(3*r));             //string
  Point p3(x+(2*r),y+(4*r));
  Point p2(x,y+(5*r));
  Point p1(x-(2*r),y+(4*r));
  //connect the dots
  cwin << Line(c2,s1) << Line (c2,s2) << Line(s1,s2) << Line(s1,p1) << Line(s2,p3) <<Line(p1,p2) <<Line  (p3,p2);
  if (y>0){Parachutist::display();}
  }


int ccc_win_main(){

    cwin.coord(0,1000,1000,0);
    Parachutist person1(150, 8,1000);  //speed of plane, seconds to pull chute, height of plane
    person1.display();
    
  return 1;
}
ne555 (10692)
You are having scope problems and with functions 
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Parachutist::Parachutist() //this does nothing
{
    int pull = 6; //local variables
    int speed = 150;
    int seconds = 0; 
    int dy = 0; 
    int dx = 0; 
    int x = 100;    
    int y = 950;

}//local variables die
Parachutist::Parachutist(int s, int p, int height)
{
    speed = s;  //what is speed? 
    pull = p;    //the only pull that exists is a function, not an integer
    y = height;
}
void Parachutist::display()
{
  if (seconds<pull) //pull is a function that returns void so I don't understand what do you want
    void move_closed(int,int); //declaring a function?
    display_closed(); //this is actually outside the if 
  if (seconds>=pull)
    void move_open(int,int);
    display_open();
}

xCaldazar (16)
Ya lot of the syntax wasn't explained in my class. They expected us to know a lot of this, problem is last semester my teacher didn't speak English well so I didn't know half of what he said.

The if statements I tried to copy what is going on in this rocket program that we had for an example. I understand more of what I'm doing wrong, I should be able to piece more together. 

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// File: rocket.cpp

#include "ccc_win.h"
using namespace std;
class Rocket
{
public:
  Rocket();  
  Rocket(Point loc);      
  void display() const; 
  void move(int dx, int dy);  
  void set_direction(string newdirection);  
private:
  Point llc; 
  string direction; 
  void displayup() const; 
  void displaydown() const; 
  void displayright()const; 
  void displayleft()const; 
};

Rocket::Rocket()
{
  llc = Point(0,0);
  direction="up";
}

Rocket::Rocket(Point loc)
{
  llc=loc;
  direction="up";
}

void Rocket:: move(int dx, int dy)
{
  llc.move(dx,dy);
}

void Rocket::set_direction(string newdirection)
{
  direction=newdirection;
}

void Rocket::display() const
{

  if (direction == "up")
    displayup();
  if (direction == "down")
    displaydown();
  if (direction == "right")
    displayright();
  if (direction == "left")
    displayleft();
}

void Rocket::displayup() const
{
Point p1(llc.get_x()+0,llc.get_y()+100);
Point p2(llc.get_x()+20,llc.get_y()+150);
Point p3(llc.get_x()+40,llc.get_y()+100);
Point p4(llc.get_x()+40,llc.get_y()+0);
cwin<<Line(llc,p1)<<Line(p1,p2)<<Line(p2,p3)<<Line(p3,p4)<<Line(p4,llc);
}


void Rocket::displaydown() const
{
Point p1(llc.get_x()+0,llc.get_y()-100);
Point p2(llc.get_x()+20,llc.get_y()-150);
Point p3(llc.get_x()+40,llc.get_y()-100);
Point p4(llc.get_x()+40,llc.get_y()+0);
cwin<<Line(llc,p1)<<Line(p1,p2)<<Line(p2,p3)<<Line(p3,p4)<<Line(p4,llc);
}

void Rocket::displayright() const
{
Point p1(llc.get_x()+0,llc.get_y()+40);
Point p2(llc.get_x()+100,llc.get_y()+40);
Point p3(llc.get_x()+150,llc.get_y()+20);
Point p4(llc.get_x()+100,llc.get_y()+0);
cwin<<Line(llc,p1)<<Line(p1,p2)<<Line(p2,p3)<<Line(p3,p4)<<Line(p4,llc);
}

void Rocket::displayleft() const
{
Point p1(llc.get_x()+0,llc.get_y()-40);
Point p2(llc.get_x()-100,llc.get_y()-40);
Point p3(llc.get_x()-150,llc.get_y()-20);
Point p4(llc.get_x()-100,llc.get_y()+0);
cwin<<Line(llc,p1)<<Line(p1,p2)<<Line(p2,p3)<<Line(p3,p4)<<Line(p4,llc);
}


int ccc_win_main()
{
   cwin.coord(0,4000,4000,0);
   Rocket usa1(Point(1000,10));
   usa1.display();
   usa2.display();

  for (int i = 0; i <= 4000; i+=500)
  {
 
      if (i>=1750)
      { 
          usa1.set_direction("left");       //Parachute person1(int speed, int pull)
          usa2.set_direction("right");
          usa1.move(-200,200);
          usa2.move(200,100);
      }
      else {
          usa1.move(0,i);
          usa2.move(0,i);
      }
      usa1.display();
      usa2.display();
  }
      
 

  return 1;
}






Below is the program that works btw. Just I shouldn't have so much under the int ccc_win_main()
I was attempting to integrate more of it into the class itself. I'm not too surprised that I did it way wrong. :) thanks for the tips.
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//Parachutist

#include "ccc_win.h"
using namespace std;
class Parachutist
{
public:
  Parachutist();  
  Parachutist(Point loc);      
  void display() const; 
  void move(int dx, int dy);
  void set_parachute(string newParachute);  
private:
  Point p;
  string parachute; 
  void noParachute() const;
  void Parachute() const;
};

Parachutist::Parachutist()
{
  p = Point(0,0);
  parachute= "no parachute";
}

Parachutist::Parachutist(Point loc)
{
  p=loc;
  parachute= "no parachute";
}

void Parachutist:: move(int dx, int dy)
{
  p.move(dx,dy);
}

void Parachutist::set_parachute(string newParachute)
{
  parachute=newParachute;
}

void Parachutist::display() const
{

  if (parachute == "no parachute")
    noParachute();
  if (parachute == "parachute")
    Parachute();
}

void Parachutist::noParachute() const{
  Point h1(p.get_x()+0,p.get_y()+0);
  Point b1(p.get_x()+0,p.get_y()-10);
  Point b2(p.get_x()+0,p.get_y()-(4*10));
  Point l1(p.get_x()+((0.5)*10),p.get_y()-(5.5*10));
  Point l2(p.get_x()-((0.5)*10),p.get_y()-(5.5*10));
  Point c1(p.get_x()+0,p.get_y()-(3*10));
  Point a1(p.get_x()+(10),p.get_y()-(1.5*10));
  Point a2(p.get_x()-(10),p.get_y()-(1.5*10));

  cwin << Circle(h1,10) << Line(b1,b2) << Line(b2,l1) << Line(b2,l2) << Line (c1,a1) << Line (c1,a2);
}

void Parachutist::Parachute() const{
  Point h1(p.get_x()+0,p.get_y()+0);
  Point b1(p.get_x()+0,p.get_y()-10);
  Point b2(p.get_x()+0,p.get_y()-(4*10));
  Point l1(p.get_x()+((0.5)*10),p.get_y()-(5.5*10));
  Point l2(p.get_x()-((0.5)*10),p.get_y()-(5.5*10));
  Point c1(p.get_x()+0,p.get_y()-(3*10));
  Point a1(p.get_x()+(10),p.get_y()-(1.5*10));
  Point a2(p.get_x()-(10),p.get_y()-(1.5*10));
  Point c2(p.get_x()+0,p.get_y()-(2*10));
  Point s1(p.get_x()-(3*10),p.get_y()+(3*10));
  Point s2(p.get_x()+(3*10),p.get_y()+(3*10));
  Point p3(p.get_x()+(2*10),p.get_y()+(4*10));
  Point p2(p.get_x()+0,p.get_y()+(5*10));
  Point p1(p.get_x()-(2*10),p.get_y()+(4*10));

  cwin << Circle(h1,10) << Line(b1,b2) << Line(b2,l1) << Line(b2,l2) << Line (c1,a1) << Line (c1,a2) << Line(c2,s1) << Line (c2,s2) << Line(s1,s2) << Line(s1,p1) << Line(s2,p3) <<Line(p1,p2) <<Line(p3,p2);
}



int ccc_win_main(){
  cwin.coord(0,1000,1000,0);
  
  
  int velocity = 0;
  int altitude = 950;
  int speed = 100;
  int drag = 0;
  int horizontal = 100;
  int seconds = 0; 
  
  while(altitude >= 0){

    Parachutist fall(Point(horizontal,altitude));
    

    seconds = seconds + 1;

    if(seconds <= 6){
      velocity = 32 * seconds;
      drag = speed;
      if(velocity > 174){
        velocity = 174;}
    }
    else if(seconds >= 7){
          
     fall.set_parachute("parachute");
      velocity = velocity - (100 * seconds);
      drag = drag - 20;
      if(drag <= 0){
        drag = 0;}
      if(velocity <= 17){
        velocity = 17;}
    }   

    altitude = altitude - velocity;
    horizontal = horizontal + drag;
    
    fall.display();
  }
  
  
  return 1;
}



xCaldazar (16)
I wish I could spoiler some of the above, so dang long. Just thought what I'm trying to do might make more sense.

I didn't mean to have a void pull();. I got rid of that.

I don't understand where I am supposed to declare my values for the whole class to be able to use them.

I thought this:
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Parachutist::Parachutist() //this does nothing
{
    int pull = 6; //local variables
Was my default constructor that declared values for rest of the class. Guess I misunderstood that part.

The whole part was supposed to be in the if statement, my bad. Problem with skeleton setups is I forget to add in syntax sometimes. I just declared a function there because the compiler seemed to want that, kept complaining about it, I got rid of the void now. 
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    void move_closed(int,int); //declaring a function?
    display_closed(); //this is actually outside the if


The if statement is supposed to decide when they have pulled the shoot or not.
ne555 (10692)
http://www.cplusplus.com/doc/tutorial/classes/
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class Parachutist 
{
public:
  Parachutist();
  Parachutist(int, int, int);  
  void pull();      
  void move(int dx, int dy);
  void display();
private:
  Point man; //here you declare the members of your class 
  int seconds; //you are saying that every Parachutist has got these variables (they are its state)
  int y;
  int x;
  int dy;
  int dx;
  int r;
  void move_closed(int, int);
  void display_closed();
  void move_open(int,int);
  void display_open();
};
xCaldazar (16)
Cool, that is actually where I moved them to. I don't get where I set the values though. I tried a line like
int seconds (void){return 0;}
Because I saw them do it this tutorial. Under overloading constructors. http://www.cplusplus.com/doc/tutorial/classes/
Would it be in this area that I set them?
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Parachutist::Parachutist()
{
}



Edit{ Figured it out, (int dx, int dy) only needed to be (dx,dy). I don't know exactly why but I found it online. Now just to set my values so something happens. :) }
They did this in the rocket program I have for reference, so I don't understand why this doesn't work:
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void Parachutist::display()
{
  if (seconds<pull)
    {
    void move_closed(int dx,int dy);
    display_closed();
    }
  if (seconds>=pull)
    {
    void move_open(int dx,int dy);
    display_open();
    }
}


It gives me an error of:
84: error: expected primary-expression before 'int'
84: error: expected primary-expression before 'int'
89: error: expected primary-expression before 'int'
89: error: expected primary-expression before 'int'

Those are actually the only errors I have left in my program. Hopefully it will compile if I fix those. Bugs expected and greeted atm, I just want this thing to compile.


... I know I'll look back on this and laugh that I didn't understand this. I'm not one who likes asking for help, I like to try and figure it out on my own. What you have helped with is very appreciated though.
Last edited on
xCaldazar (16)
Finished my code successfully. Probably looks a lot different in the way it functions. I pretty much trashed what I was doing and then just took pieces as I needed them.
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//Parachutist
//Taylor Sanchez
//Homework_1

//The stick figure is contructed from the center point for the head, and scaled off the radius. 
//if the size is changed the while statement must be changed to have him land directly on his feet. It should be radius*5
//default is a radius of 20. Which *6 gets me 120. Make sure to edit both r's under noParachute() and yesParachute()

#include "ccc_win.h"
using namespace std;
class Parachutist
{
public:
  Parachutist();                            //constructors
  Parachutist(Point loc);      
  void move(double pull, double speed);     //mutator
private:
  double changey;// = 0;       //deceleration factor   //change in y each second, due to gravity and parachute
  double changex;// = 0;       //drag factor           //change in x each second, due to drag
  double speed;
  double sec;
  double r;
  double x;
  double y;
  Point llc;
  void noParachute() const;                 //accessors
  void yesParachute() const;
};
Parachutist::Parachutist()
{
  llc = Point(0,0);
}
Parachutist::Parachutist(Point loc)
{
  llc=loc;
}

void Parachutist:: move(double pull, double speed)
{
  while (llc.get_y()>=120)          //it is so high because the scale of the person had to be large to look decent on the display. I wanted his feet to touch the ground, not his head which the point is based off of.
  {
  if(sec <pull)
    {
      sec++;
      noParachute();
      changey = 32*sec;                     //acceleration of falling object
      changex = speed;
      if(changey > 174) {changey = 174;}    //doesn't go over terminal velocity
      llc.move(changex,-changey);                      //change y's position  //change x's position
    }
    else if(sec >= pull)
    {
      sec++;
      yesParachute();
      changey = changey-(100 * sec);
      changex = changex-20;                 
      if(changex <= 0)  {changex = 0;}      //don't want them going backwards
      if(changey <= 17) {changey = 17;}     //Slowest parachute will slow them down.
      llc.move(changex,-changey);                      //change y's position  //change x's position
        
    }   
  } 
}
void Parachutist::noParachute() const{
    double r=20;
    double x=llc.get_x();
    double y=llc.get_y();
    //head
  Point h1(x+0,y+0);
    //body
  Point b1(x+0,y-r);
  Point b2(x+0,y-(4*r));
    //legs
  Point l1(x+((0.5)*r),y-(6*r));
  Point l2(x-((0.5)*r),y-(6*r));
    //arms
  Point c1(x+0,y-(2.0*r));
  Point a1(x+(r),y-(1.5*r));
  Point a2(x-(r),y-(1.5*r));
    //connect the dots
  cwin << Circle(h1,r) << Line(b1,b2) << Line(b2,l1) << Line(b2,l2) << Line (c1,a1) << Line (c1,a2);
}
void Parachutist::yesParachute() const{
    double r=20;
    double x=llc.get_x();
    double y=llc.get_y();
    //head
  Point h1(x+0,y+0);
    //body
  Point b1(x+0,y-r);
  Point b2(x+0,y-(4*r));
    //legs
  Point l1(x+(0.5*r),y-(6*r));
  Point l2(x-(0.5*r),y-(6*r));
    //arms
  Point c1(x+0,y-(3*r));
  Point a1(x+(r),y-(1.5*r));
  Point a2(x-(r),y-(1.5*r));
    //parachute
  Point c2(x+0,y-(2*r));
  Point s1(x-(3*r),y+(3*r));
  Point s2(x+(3*r),y+(3*r));
  Point s3(x+0,y+(3*r));
  Point p3(x+(2*r),y+(4*r));
  Point p2(x+0,y+(5*r));
  Point p1(x-(2*r),y+(4*r));
  
    //connect the dots
  cwin << Circle(h1,r) << Line(b1,b2) << Line(b2,l1) << Line(b2,l2) << Line (c1,a1) << Line (c1,a2) << Line(c2,s1) << Line (c2,s2) << Line(s1,s2) << Line(s1,p1) << Line(s2,p3) <<Line(p1,p2) <<Line(p3,p2) << Line(s3,p3) <<Line(s3,p2) <<Line(s3,p1);
}
int ccc_win_main(){
  double x = 50;            //starting point x coordinate
  double y = 1000;          //starting point y coordinate
  double speed = 100;       //plane speed
  double freefall = 6;      //seconds at which chute pulled (or freefall time)
  cwin.coord(0,1000,1200,-200);  
  {
    Parachutist man(Point(x,y));
    man.move(freefall,speed);
  }  
  Point g1(0,0);            //ground
  Point g2(10000,0);        //ground   
  cwin << Line(g1,g2);      // 
return 1;
}

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