//This program was originally meant to help me in my Physics for Engineers
//class. Unfortunatly I botched the code or my physics somewhere and thus the code doesn't
//work as advertised.


void AutoExec()
{
SetAppName("Newton's Hello World");
// Give the program a name in the title bar - just to be nice
int x = ImageWidth(screen) / 2; //Initial Hello World Position
int y = ImageHeight(screen) / 2;
int forceX=0; //My Forces on the X and Y axis
int forceY=0;
int accelerationX=0; //My acceleration on the X and Y axis
int accelerationY=0;
int velocityX=0; //My velocity on the X and Y axis
int velocityY=0;
int mass=50; //My mass
int Ptimer=1; //Just a timer to keep track of odd and even times
int xi=x; //Initial and final x position used with my timer
int xf=x;
int yi=y; //Initial and final y position used with my timer
int yf=y;
int friction=1; //Plans for friction, my Hello World slows down.
while (!b3)
{
if(Ptimer=1)
{
xi = x;
yi = y;
Ptimer--;
}
else if(Ptimer=0)
{
xf= x;
yf= y;
Ptimer++;
}
// Now we are going to check the arrow keys (or gamepad directionals) one at a time
// Then move the text around if a button is pressed at the last ShowPage() call
// We check up OR down then separately left OR right
// So the text will move diagonally if two nonconflicting buttons held down together
// We modify the Forcex and Forcey variables according to the button presses, moving the text
if (up) // If up arrow is pressed
{
ForceY -= 1; // Decrease y force
}
else if (down) // If down arrow is pressed
{
ForceY += 1; // Increase y force
}
if (left) // If left arrow is pressed
{
ForceX -= 1; // Decrease x coordinate
}
else if (right) // If right arrow is pressed
{
ForceX += 1; // Increase x coordinate
}
//Makes sure it doesn't fly off the screen, doesn't work yet for some reason
/*if(x>ImageWidth(screen)-100)
forceX -= 1;
if(x<100)
forceX += 1;
if(y>ImageHeight(screen)-100)
forceX -= 1;
if(y<100)
forceX += 1;*/
//All our Xiness, Has all the equations of movements,
//All of them are done on each iteration so time in our equation is 1
accelerationX=forceX/mass;
x=x + velocityx + (1/2)*accelerationX;
velocityX=accelerationX;
//All our Yiness
accelerationY=forceY/mass;
y=y + velocityY + (1/2)*accelerationY;
velocityY=accelerationY;

RectFill(0, 0, ImageWidth(screen), ImageHeight(screen), 0, screen);
// Reset the screen buffer to plain black
PrintCenter(x, y, screen, 0, "Hello World!");
// Prints said text centered from coordinates x, y
ShowPage(); // Displays the buffer on the screen
}
Exit("Bye!");
}