Ballistic - OpenProcessing

mySketch
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// Ballistic.
// bam:9906
​
String title=   "Ballistic";
String author=  "B.A.Martin";
String sub=     "Press space-bar to advance time";
String subsub=  "(or press keys 1, 2, 3, etc.)";
String hint=    "'q' to quit; 'r' to reset\n's' to show answers";
​
​
// Time, distance, velocity, acceleration
int time=0;
float d=0, v=100, a=10, v0=100, vf=0, vavg=0, dlast=0;
float xo=35, xt=150, xv=200, xvavg=250, xd=300, xdrop=350;
//
//--  float xb=20, wide=100, tall=850, roof=60, bottom=roof+tall;
float xb=20, wide=100, tall=850, roof=60, bottom=600;
boolean hide=false, pause=false;
​
color RED=color(255,0,0), GREEN=color(0,255,0), BLUE=color(0,0,255);
color YELLOW=color(255,255,0), CYAN=color(0,255,255), MAGENTA=color(255,0,255);
color BROWN=color(127,0,0);
​
void setup() {
  size( 600, 650 );
}
​
void draw() {
  scene();
  titles();
  action();
  pause=  true;       // Wait for next event.
}
​
void action() {
  dlast=0;
  // Labels above & below
  labels( roof );
  labels( bottom+20 );
  // Show values for each second of rising/falling
  line( xb+wide+5, bottom-d, xb+wide+280, bottom-d );
  for (int t=0; t<=time; t++ ) {
    show( t );
  }
}
void labels( float yy ) {
  fill(BLUE);
  textSize(10);
  text( "time", xt, yy );
  text( "velocity", xv, yy );
  text( "v-avg", xvavg, yy );
  text( "distance=\n  vavg*t", xd, yy );
  text( "drop=\n  d(t)-d(t-1)", xdrop, yy );
} 
   
// Display object and values at time t //
void show( float t ) {
  vf=    v0 - a * t;
  vavg=  (v0+vf) / 2;
  d=     vavg * t;
  //--  float y=  roof + d +12;
  float y=  bottom - d;
  float xx=  vf>0 ? 0 : 12;           // Right shifted after apogee
  float xxx=  vf>0 ? xo+t*3 : xo+t*3 + 10;
  float yy=  vf>0 ? y : y+12;         // above or below line.
  float speed=  -5 * vf/10;           // speed indicator lines
  //
  stroke(BLUE);
  //--  line( xb+wide+25, y, xb+wide+260, y );
  line( xxx+20, y, xxx+260, y );
  if (vf>0) {
    //--  text( ""+(-speed)+" m/s", xo-100, y-6 );
    stroke(RED);
    fill(YELLOW);         // Yellow rocket.
    triangle( xxx-6, y, xxx, y+speed, xxx+6, y  );
    fill(BLUE);
  } else {
    //--  text( ""+(-speed)+" m/s", xo-50, y+6 );
    noStroke(); 
    fill( 200-vf/20,0,0, 200-vf/3);   // Brown (transparent) debris.
    ellipse( xxx,y, 10-vf/5, 10-vf/20  );
    stroke(BROWN);
    fill(RED);
  }
  if (abs(vf) < 0.5) {  text( "APOGEE!", xo, y-12 ); }
  if (vf<0 && y>=bottom) {  text( "SPLASHDOWN.", xo, bottom-6 ); }
​
  // Leading blast or trailing smoke 
  line( xxx, y, xxx-3, y-speed*3/4 );
  line( xxx, y, xxx, y-speed*3/4 );
  line( xxx, y, xxx+3, y-speed*3/4 );
  //
  values( t, xx, yy );
}
void values( float t, float xx, float y ) {
  textSize(12);
  text( ""+(int)t+"s", xx+xt, y );
  if (hide) {
    text( "__ m/s", xx+xv, y );
    text( "__ m/s", xx+xvavg, y );
    text( "___ m", xx+xd, y );
    text( "__  m", xx+xdrop, y );
  } else {
    text( ""+(int)vf, xx+xv, y );
    text( ""+(int)vavg, xx+xvavg, y );
    text( ""+(int)d, xx+xd, y );
    text( ""+(int)(d-dlast), xx+xdrop, y );
  }
  dlast=  d;
}
​
void scene() {
  background( 255, 225, 255 );
  //--  fill(200,100,100);
  //--  rect( xb, roof, wide, tall );        // Building
  //--  stroke(0,150,0);
  //--  line( xb, bottom, width, bottom );
  stroke(0);
  //--  man( xb+wide-20, roof+30 );         // Man on/under roof
}
void titles() {
  fill(0);
  textSize(24);
  text( title, 10, 24 );  
  textSize(12);
  text( sub, xt, 12 );
  fill( 150 );
  text( subsub, xt, 24 );
  text( hint, width*3/4, 12 );
  text( author, 20, height-20 );
  report( width*3/4, roof-12 );
}
void report( float x, float y ) {
  //--  int xr=width*3/4, y=60, n=0, h=16;
  //--  man( xr, roof+30);    // Also show man.
  int n=0, h=16;
  fill(MAGENTA);
  textSize( h );
  text( "time:  "+time, x, y+h*n++ );      // Next line.
  text( "distance:  "+d, x, y+h*n++ );  
  text( "velocity:  "+vf, x, y+h*n++ );
  text( "acceleration:  "+a, x, y+h*n++ );
}
​
void keyPressed() {
  if (key == 'q') exit();
  else if (key == 'r') time=0;          // reset.
  else if (key == 's') hide=  ! hide;   // show/hide.
  else if (key == ' ') ++time;
  else if (key >= '0' && key <= '9') time=  key-'0';
  pause=false;
}