Button+BallBounce - OpenProcessing

mySketch
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int x;
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int y;
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int w;
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int speed;
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int eX;
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int eY;
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int eWidth;
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PFont font;
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int linex;
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int linex2;
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boolean bgChange=false; 
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boolean shiftTyped=false;
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void setup() {
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  size(400, 400);
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  eX=width/2;
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  eY=height/2;
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  eWidth=200;
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  x=150;
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  y= 30;
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  w= 30;
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  speed= -5;
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  linex= width/4;
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  linex2= width*3/4;
}
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void draw() {
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  background(0, 0, 255);
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  ellipse (x, y, w, w);
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  line (linex, 0, linex, height); 
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  line (linex2, 0, linex2, height);
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  x = x+ speed;
  
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if (( x > 400) || (x < 10)) {
  speed = 5;
  
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  // move to the left
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  //speed= -5;
}
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//if (x<linex) {
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  //move right
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  //speed=5;
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if ((x> width) || (x<0)) {
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  speed=speed*-1;
}
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if (bgChange ==true) {
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  background (255, 0, 0); 
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  ellipse (x, y, w, w);
} else {
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  background (0, 255, 255);
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  fill (0, 0, 0); 
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  ellipse (eX, eY, eWidth+100, eWidth+100);
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  font = loadFont("OratorStd-48.vlw");   
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  fill (255, 255, 255); 
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  textFont (font, 20); // draws the font + gives it a size
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  text ("Click or Press:SHIFT", 100, height/2);
}
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if (shiftTyped==true) {
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  background(255, 0, 0);
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  fill (0, 0, 0);
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  ellipse (x, y+120, w+70, w+70);
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  fill (255, 255, 255);
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  ellipse (x, y+120, w+20, w+20);
}
}
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void keyPressed() {
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  if (keyCode==SHIFT) {
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    shiftTyped=true;
  }
}
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  void keyReleased() {
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    if (keyCode==SHIFT) {
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      shiftTyped=false;
    }
  }
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    void mouseClicked () {
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      if (dist (eX, eY, mouseX, mouseY)<eWidth/2) {
      }
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      if (bgChange ==true) {
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        bgChange= false;
      } else {
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        bgChange= true;
      }
    }