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Homework Statement
What's wrong with code below? I tried all day and night...don't know what's wrong and how to change the code. Help anyone. I have uploaded picture of map which I have to make
http://www.portmain.com/intro/hw/hw05-field.html
Homework Equations
The Attempt at a Solution
//File: orbit.cxx
//Written by Suroj Lamichhane(suroj.lamichhane@colorado.edu)
//This program opens a large graphics window which simulates the
//the map of acceleration field created by 3 stars.
//Directives
#include <iostream>
#include <cstdlib>
#include <cmath>
#include <graphics.h>
using namespace std;
//Named Constants
double const wmax= 2.5*pow(10.0,11.0);
double const G=6.67*pow(10.0, -11.0);
int const S=500;
// Prototypes
//These functions creates stars at a fixed locations and creates
// grids. It also changes world coordinates to pixel coordinate
// and makes vectors in acceleration field.
void draw_star(double wx,double wy,double radius,int color);
void draw_vector(double x, double y,double yellow_x,double
yellow_y,double yellow_m,
double blue_x,double blue_y,double blue_m,double red_x
,double red_y,double red_m);
int pixel(double wx, double w0, double w1, int p0, int p1);
double accx(double x, double y, double sx, double sy, double m);
double accy(double x, double y, double sx, double sy, double m);
int pixel(double wx, double w0, double w1, int p0, int p1);
//Function definitions:
//------------------------------------------------------------------------------
int main()
{
double x, y,yellow_x,yellow_y,yellow_m,
blue_x,blue_y,blue_m,red_x,red_y,red_m,wx,wy,radius,color;
initwindow(S,S,"Field of Dreams");
setfillstyle(SOLID_FILL, WHITE);
for (y=-wmax; y<wmax; y=y+(wmax/6))
{
for(x=-wmax;x<wmax;x=x+(wmax/6))
{
draw_vector(x, y,3.0*pow(10.0,10.0),-7.5*pow(10.0,10.0),2.5*pow(10.0,30.0),
-4.5*pow(10.0,10.0),3.0*pow(10.0,10.0),9.5*pow(10.0,30.0),4.5*pow(10.0,10.0),9.0*pow(10.0,10.0),1.5*pow(10.0,31.0));
//(3.0e10, -7.5e10)
//(-4.5e10, +3.0e10)
//(+4.5e10, +9.0e10)
}
draw_star(3.0*pow(10.0,10.0),-7.5*pow(10.0,10.0),5,14);
draw_star(-4.5*pow(10.0,10.0),3.0*pow(10.0,10.0),7,1);
draw_star(4.5*pow(10.0,10.0),9.0*pow(10.0,10.0),9,4);
}
delay(60000);
}
//------------------------------------------------------------------------------
void draw_star(double wx,double wy,double radius,int color)
{
int px=pixel( wx,-1.5, +1.5,0,S);
int py=pixel( wy,-1.5, +1.5,0,S);
setfillstyle(SOLID_FILL,color);
fillellipse(int(px),int(py), int(radius),int(radius));
setcolor(color);
}
//------------------------------------------------------------------------------
void draw_vector(int x, int y,double yellow_x,
double yellow_y,double yellow_m,
double blue_x,double blue_y,double blue_m,
double red_x,double red_y,double red_m)
{
double sx,sy;
yellow_x=accx(x,y,sx,sy,yellow_m);
blue_x =accx(x,y,sx,sy,blue_m);
red_x =accx(x,y,sx,sy,red_m);
yellow_y=accy(x,y,sx,sy,yellow_m);
blue_y =accy(x,y,sx,sy,blue_m);
red_y =accy(x,y,sx,sy,red_m);
int x1=int (yellow_x+blue_x+red_x);
int y1=int (yellow_y+blue_y+red_y);
double length=sqrt((((5.0*pow(10.0,10.0))*x1)*((5.0*pow(10.0,10.0))*x1))
+(((5.0*pow(10.0,10.0))*y1)*((5.0*pow(10.0,10.0))*y1)));
if (length<wmax/(7.07107))
{
line(x,y,x1,y1);
setfillstyle(SOLID_FILL,15);
fillellipse(x,y,2,2);
}}
//------------------------------------------------------------------------------
int pixel(double wx, double w0, double w1, int p0, int p1)
{
double px;
px=p0+((wx-w0)*(p1-p0)/(w1-w0));
return (int(px));
}
//------------------------------------------------------------------------------
double accx(double x, double y, double sx, double sy, double m)
{
double dx = (sx - x);
double dy = (sy - y);
double denominator = pow(dx*dx + dy*dy, 1.5);
return G*m*dx/denominator;
}
//------------------------------------------------------------------------------
double accy(double x, double y, double sx, double sy, double m)
{
double dx = (sx - x);
double dy = (sy - y);
double denominator = pow(dx*dx + dy*dy, 1.5);
return G*m*dy/denominator;
Homework Statement
Homework Equations
The Attempt at a Solution
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