Modify a text file: $/39/p31a.java

$/39/p31a.java

///// Practice Oct. 2
String title="Practice Oct. 2", author="BAM";
float x=400, y=300, w=50, h=80;
float sealevel=100, waveSize=20, waveSpacing=20;
float buttonX, buttonY;
int r=200,g=50,b=200;

color skyColor=color(200,220,255);
color seaColor=color(50,200,250);
color grassColor=color(0,150,50);

boolean debug=false;

void setup() {  
  //// Init.
  size(800,600); 
  buttonX=width-200;
  buttonY=height-100;
}
void draw() {
  //// Next frame
  scene();  
  action();
}
void scene() {
  //// sky, sea, grass, button, etc.
  background( 200,220,255 );
  fill(0);
  textSize(20);
  text( title, 300, 20 );
  textSize(12);
  text( "? for help", 300, 40 );
  if (key == '?') help();
  // Sea
  noStroke();
  fill( seaColor );        // Greenish sea.
  rectMode(CORNERS);
  rect( 0, sealevel, width, height );
  rectMode(CORNER);  
  grass();
  waves();
  // Button
  fill( 255,200,200 );
  stroke(0);
  rectMode( CENTER );
  rect( buttonX, buttonY, 150, 50 );  
  fill(0);
  text( "CLICK", buttonX-50, buttonY-10 );
  text( "to move octopus", buttonX-50, buttonY+10 );
}
void help() {
  //// Instructions
  int n=2;
  fill(100,0,0);
  text( "Click octopus to change color", 500, 12*n++ );
  text( "Click button to move octopus", 500, 12*n++ );
  text( "~ to change waves", 500, 12*n++ );
  text( "@ for debugging", 500, 12*n++ );
  text( "----", 500, 12*n++ );
  text( "@ for debugging", 500, 12*n++ );
}
void grass() {
  ////
  float grassX=10, grassX2=10, grassSkip=20;
  while ( grassX < width) {
    strokeWeight( 4) ;
    stroke( grassColor );
    line( grassX,height-50, grassX2, height-5 );
    grassX=  grassX + grassSkip;
    grassX2=  grassX2 + grassSkip;
  }
}
void waves() {
  //// Waves at sealevel
  float p=10, dp=(waveSpacing+waveSize)/2;
  while (p<width) {
    noStroke();
    fill(skyColor);
    ellipse( p, sealevel, waveSpacing, waveSpacing );
    p += dp;
    fill(seaColor);
    ellipse( p, sealevel, waveSize, waveSize );
    p += dp;
  }
}

void action() {
  //// 
  fill( r,g,b );
  rectMode(CENTER);
  rect( x, y, w, h );
  //// DEBUG
  if (debug) {
    fill(0);
    text( r, x+50, y);
    text( g, x+50, y+20);
    text( b, x+50, y+40);
  }
}

void mousePressed() {
  //// Click event 
  if ( hit(x,y,w,h) ) {
    background(0);
    r=  int( random( 100, 250) );
    g=  int( random( 0,100 ));
    b=  int( random( 100, 250));
   }
   if (hit(buttonX,buttonY, 150,40)) {
     //--  background(0,255,0);
     x=  random(50,width-50);
     y=  random(sealevel,height-50);   
   }
}
boolean hit( float x, float y, float w, float h ) {
  //// True if mouse hit this rect
  return mouseX > x-w/2  && mouseX < x+w/2 
  && mouseY > y-h/2  && mouseY < y+h/2 ;
}
void keyPressed() {
  //// Key handler
  if (key=='q') exit();
  if (key=='@') debug = ! debug;
  if (key=='~') {
    waveSize = random(15,50);
    waveSpacing = random(15,50);
  }
}