Modify a text file: $/project4a.java

$/project4a.java

//// Bouncing ball within a box.

String title="Bouncing ball within a box.";
String news="";
String author="B.A.Martin, CST112, Project 4a";

int counter=0;      
float boxX=50, boxY=50, boxW=500, boxH=300;
float ballX=10, ballY=10, ballDX=5, ballDY=9;
float ballR, ballG, ballB;

void setup() {
  //// Set up frame size, etc.  
  size( 640, 480 );
  reset();
}
void reset() {
    ballDX=  random(10);
    ballDY=  random(4);
    ballR=  random(255);
    ballG=  random(255);
    ballB=  random(255);
    counter=0;              // Zero out the frame count.    
}

void draw() {                                                                             
  // Draw the next frame.
  scene();    // new scene (bg + text )
  //// Dynamic sketches -- change with every frame! ////
  action();
  ball();
}// draw() //

void scene() {
    background( 255, 220, 220 );        // RED, GREEN, BLUE
    text( news, width/4, 40 );
    fill(0);
    text( title, width/4, 20 );
    text( author, 20, height-30 );
}// scene() //

void action() {
  //// 0.7:  Action! ////   
  fill( 255,127,0);
  line(0,310, width,310);
  if ( (counter/30) % 2 == 0 )  {
    textSize(20);
    text( "Move the  mouse!", 150, 350 );    // Flashing message.
    textSize(12);
  }
  counter++;

rectMode(CENTER);
  noStroke();
  rect( mouseX, mouseY, 50, 90 );
  fill( 255,255,255 );
  ellipse( mouseX-12, mouseY-30, 10,10 );
  ellipse( mouseX+12, mouseY-30, 10,10 );
  fill( 0,0,255 );
  ellipse( mouseX-12, mouseY-30, 5,5 );
  ellipse( mouseX+12, mouseY-30, 5,5 );
  fill(255,0,0);
  text( "Mickey", mouseX-20, mouseY+30 );
}

void ball() {
  //// 0.8:  Action! ////   
  fill(0);
  text( "Click inside box,\n for a new ball. ", width-100, 20 );
  text( "Frame number "+counter, width/2, height-20 );

fill( 220,230,255 );
  stroke(0);
  strokeWeight(4);
  rectMode(CORNER);
  rect( boxX, boxY, boxW, boxH );
  ballX += ballDX;
  ballY += ballDY;
  if (ballX < 0 || ballX > boxW) ballDX=  -ballDX;
  if (ballY < 0 || ballY > boxH) ballDY=  -ballDY;

fill( ballR, ballG, ballB );
  noStroke();
  ellipseMode(CENTER);
  ellipse( boxX+10+ballX, boxY+ballY, 15,15 );
}

boolean within( float x, float y, float left, float right, float top, float bottom ) {
  //// True if x,y within boundaries ////
  return x>left && x<right && y>top && y<bottom;
}

//// EVENT HANDLERS ////
void mousePressed() {
  if ( within( mouseX,mouseY, boxX, boxX+boxW, boxY, boxY+boxH ) ) {
    news=  "(Click inside box, for new ball)";
    //// Start new ball here! ////
    ballX=  mouseX - boxX;
    ballY=  mouseY - boxY;
    reset();
  } else {
    // Ignore mouse clicks outside of box.
    background(255,0,0);
    news=  "CLICK MOUSE WITHIN BOX, ONLY!";
  }
}

void keyPressed() {
    //// Event handler for keyboard.
        background(255,0,0);
    if (key=='r') reset();
    if (key=='q') exit();
}