Modify a text file: $/orbit/orbit1.java

$/orbit/orbit1.java

//////// On planet in orbit.  // bam (CST112)

float theta=0;    // Angle from sun to planet.
float sunX=  width/2;
float sunY=  height/2;
float sunR=  80;
float pR=  10;          // Radius of planet.

float r=  100;    // radius of planet's orbit.
float x= sunX, y=sunY-r;    // position of planet in orbit.
float v=  10;     // velocity.

void setup() {
  size(800,800);
  theta=0;    // Angle from sun to planet.
  sunX=  width/2;
  sunY=  height/2;
  sunR=  40;
  pR=  5;          // Radius of planet.

r=  150;              // radius of planet's orbit.
  x=  sunX;
  y=  sunY-r;    // position of planet in orbit.
  v=  2;               // velocity.
}

void draw() {
  background ( 255 );
//  background( 0 );
  sun();
  move();
  show();
}

void sun() {
  //// Draw the sun;
  fill( 255,255,0);
  ellipseMode(RADIUS);
  ellipse( sunX, sunY, sunR, sunR );
}

void move() {
  //// Move in circular orbit
  x += v * cos(theta);
  y += v * sin(theta);
  theta += .01;
}

void show() {
  //// Show the planet at new position (x,y)
  fill( 0, 255, 255 );
  ellipseMode( RADIUS );
  ellipse( x, y, pR, pR );
}