Modify a text file: $/practice-array3.pde

$/practice-array3.pde

//// practice-array3 // Program to demonstrate arrays and algorithms.    Version3

int[] a= new int[]  { 55, 22, 33, 77, 11, 99, 88, 66, 44 };
int many=  a.length;
int x=10, y=100;

boolean sorted=false;

Button sortButton, fillButton;

void setup() {
  size(500,300);
  sortButton=  new Button("SORT", 300,50);
  fillButton=  new Button("FILL", 300,150, color(127,127,255), 0);
}

void draw() {
  background(191,255,191);
  sortButton.show();
  fillButton.show();
  // Now, show the array (sorted or not).
  if ( ! sorted) {  
    y=30;
      showArray(a,many);
      showBig();
  } else {

fill(0);
    text("SORTED ARRAY:", 10,10);
    y=  50;

//// Display array,
    showArray(a, many);
    showBig();
  }
}

void mousePressed() {
  //// Check which button was clicked.
  if (sortButton.isOver( mouseX, mouseY )) {
    sortArray(a, many);
    sorted=  true;
    sortButton.c=  color(0,255,0);    // Button turns green.
  }
  if (fillButton.isOver( mouseX, mouseY )) {
    fillArray(a, many);
    sorted=  false;
    sortButton.c=  color(255,0,0);    // Button turns green.
  }
}
void keyPressed() {
    //// Sort the array.
    sortArray(a, many);
    sorted=  true;
}

//// ARRAY METHODS ////
void fillArray( int a[], int many) {
  //// Fill the array
  for (int j=0; j<many; j++) {
    a[j]=  (int) random(100);
  }
}
void sortArray( int a[], int many) {
  //// Sort the array
  int n=many;
  while( n>1 ) {
    //// Find biggest and move it to the end.
    int k= whereBig( a, n );
    swap( a, k, n-1 );      // Move biggest to end.
    n--;                    // Now, shrink the array.
  }
}
int whereBig( int a[], int n ) {
  //// Return index of biggest.
  int w=  0;                    //// Start with first element.
  for (int j=1; j<n; j++) 
  {
    if (a[j] > a[w]) w=  j;
  }
  return w;
}  
void swap( int a[], int i, int j ) {
  //// Swap 2 elements of an array.
  int tmp;
  tmp=  a[i];
  a[i]=  a[j];
  a[j]=  tmp;
}

void showArray( int a[], int many) {
  //// Show the array
  
  // Display the array.
  for (int j=1; j<many; j++) {
    println(a[j]);
    text(a[j], x,y);
    // Also make a bar.
    fill(0);
    rectMode(CORNERS);
    rect( x+20, y-6, x+20+2*a[j],y);
    // Prepare for next line.
    y += 12;
  }
}

void showBig() {
  //// Show biggest value in array.
    ////
    int big;

// Find the biggest number.
    big=  a[0];
    for (int j=0; j<many; j++) 
    {
      if (a[j] > big) big=  a[j];
    }

// Output the result.
    println("Biggest:  "+big);
    fill(0,0,0);
    text("Biggest value in array:  ", 200,20);
    text(big, 350,20);
}

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 );
 }
}