class DynamicField/*****************************************************************/
{
  float value;
  PGraphics dField;
  int scaleFactor;   
  
  /************constructor************************************/
  
  DynamicField(int gridColumns, 
               int gridLines
              )
  {
    scaleFactor = 1;
    dField = createGraphics(gridColumns*scaleFactor,gridLines*scaleFactor,JAVA2D);
    dField.beginDraw();
    dField.endDraw();   
  }
  
/********Methods***********************************************************************
  void increaseValue(int x, int y)
  void diffuse(float diffusion)
  void decay(float decay)
  PImage getImage()
  getGridLines()
  getGridColumns()
  float getValue(x,y)
  float getBrightness(int x,int y)
  void printlnValues()
 */
 
 void increaseValue(int x, int y)
 {
    dField.beginDraw();
    dField.noStroke();
    dField.fill(0,0,120, 4);
    dField.rectMode(CENTER);
    dField.ellipse(x*scaleFactor+scaleFactor/2,y*scaleFactor+scaleFactor/2,scaleFactor*2,scaleFactor*2);
    dField.endDraw();
 }
 
 void diffuse(float diffusion)
 {
   dField.beginDraw();
   dField.filter(BLUR, diffusion);
   dField.endDraw();
 }
 
 void decay(float decay)
 {
   dField.beginDraw();
   dField.noStroke();
   dField.fill(0,decay);
   dField.rect(0,0,getGridColumns()*scaleFactor,getGridLines()*scaleFactor);
   dField.endDraw();
 }
 
 PImage getImage()
 {
   return dField;
 }
 
 int getGridColumns()
 {
   return dField.width;
 }
 
 int getGridLines()
 {
   return dField.height;
 }
 
 float getValue(int x,int y)
 {
   color colour = dField.get(x*scaleFactor,y*scaleFactor);
   float valueAlpha = alpha(colour);
   float valueNumber = valueAlpha/25.5;
   return valueNumber;
 }
 
 float getBrightness(int x,int y)
 {
   color colour = dField.get(x,y);
   float valueBright = brightness(colour);
   return valueBright;
 }
 
 void printlnValues()
 {
   NumberFormat nf = NumberFormat.getNumberInstance();
   nf.setMaximumFractionDigits(5);
   nf.setMinimumFractionDigits(5);
   
   for(int i=0; i<gridLines; i++)
   {
     for(int j=0; j<gridColumns; j++)
     {
     print(  nf.format( getValue(j,i) )  +"  ");
     }
     println();
   }
   println();
 }
 
 
}