Modify a text file: $/button-practice.pde

$/button-practice.pde

//////// Button objects, etc.

Button a, b, c, d, e;
String msg=  "Last click:  ";
String lastClick="?";

void setup() {
  //// Initialize before drawing any frames.
  size(640, 480);
  smooth();
  a=  new Button("A", 10, 100);
  b=  new Button("B", 10, 200, color(127,127,255), 0);
  c=  new Button("C", 10, 300);
  d=  new Button("D", 10, 400, color(127,255,255), 0);
  d.w=  150;
  e=  new Button("E", 210, 400, color(127,255,127), 1);
  e.s=  "EEE";
}

void draw() {
  //// Display the scene, etc.
  background( 255, 255, 63 );
  text( "Last click was:  "+lastClick, 500,10 );
  //
  a.show();
  b.show();
  if (lastClick == "B") b.h= 75;
  c.show();
  d.show();
  if (lastClick == "E") e.w= 150;
  else e.w=75;
  e.show();
}

void mousePressed() {
  //// Which button was clicked?
  lastClick="?";
  if (a.isOver(mouseX,mouseY) ) lastClick=  "A";
  if (b.isOver(mouseX,mouseY) ) lastClick=  "B";
  if (c.isOver(mouseX,mouseY) ) lastClick=  "C";
  if (d.isOver(mouseX,mouseY) ) lastClick=  "D";
  if (e.isOver(mouseX,mouseY) ) lastClick=  "E";
}

void action( String s ) {
  //// Display this letter.
  text (s, 400,400 );
}

class Button {
  //// A button, displayed on screen, and able to detect when mouse is OVER.
  int x= 10;    // Position and size of this button.
  int y= 10;
  int w= 100;
  int h= 50;
  color c;           // Color of this button.
  int type=1;          // Button type (1=rectangle)
  String s;          // Text on this button.
 
  //// CONSTRUCTOR(S) ////
  Button() {
    //// Default constructor.
    c=color(255,127,127);
    s="BUTTON";
  }
  Button( String name) {
    //Button();
    //// Accept x & y coordinates;  use default for the others.
    c=color(255,127,127);
    s=name;
  }
  Button( String name, int xset, int yset) {
    //Button();
    //// Accept x & y coordinates;  use default for the others.
    x=  xset;
    y=  yset;
    c=color(255,127,127);
    s=name;
  }
  Button( String name, int xset, int yset, color cset, int tset) {
    //Button();
    //// Accept x & y coordinates;  use default for the others.
    x=  xset;
    y=  yset;
    c=  cset;
    type=  tset;
    s=name;
  }
  
  //// METHODS() ////
  void show() {
    //// Show the button.
    fill(c);
    if (type<1) {
      ellipseMode(CORNER);
      ellipse(x,y,w,h);
    }else{
      rectMode(CORNER);
      rect(x,y,w,h);
    }
    // Name on button.
    fill(0);
    text( s, x+10, y+h/2 );
  }
  boolean isOver( int xx, int yy ) {
    ////  Return true if xx,yy is over this button!
    if (xx < x) return false;
    else if (xx > x+w) return false;
    else if (yy < y) return false;
    else if (yy > y+h) return false;
    background(0);
    return true;
    //OR:  return ( xx>x && xx<x+w && yy>y && yy<y+h );
 }
}