String fName;
boolean fileChosen=false;
boolean showHelp=false;
int size=600;
int post=1;
int bl=0;
PFont font;
PImage i,b;
float th=0.4;
void setup(){
  size(size+size/3,size);
  font=loadFont("Ang24.vlw");
  textFont(font,24);
  smooth();
  frameRate(20);
}

void draw(){
  if(!fileChosen){
    chooseFile();} 
  if(fileChosen&&showHelp){
    display("I - INVERT\nG - GRAY\nE - ERODE\n D - DILATE\nP - POSTERIZE\nB - BLUR\nT - THRESHOLD\nO - OPAQUE\nR - RESTART\nS - SAVE\nX - EXIT");
  }}

void clearDisplay(){
  fill(255);
  rect(0,0,width/2,height/3);
}


void chooseFile(){
  String loadPath = selectInput("Choose a file to filter");  // Opens file chooser
  if (loadPath == null) {
    println("No file was selected...");
} else {
    i=loadImage(loadPath);
    image(i,0,0,width,height);
    b=get();
    fileChosen=true; 
}}

void display(String s){
  clearDisplay();
  fill(0);
  text(s,2,20);
}

void saveFile(){
String savePath = selectOutput("Choose name and location for filtered file");  // Opens file chooser
if (savePath == null) {
  // If a file was not selected
  println("No output file was selected...");
} else {
  // If a file was selected, save file
  save(savePath);
}}

void doFilter(char c){
  showHelp=false;
  image(b,0,0,width,height);
  switch(c){
  case 'B':
  case 'b':
    bl++;
    if(bl>10)bl=1;
    filter(BLUR,bl);
    break;
  case 'I':
  case 'i':
    filter(INVERT);
    break;
  case 'd':
  case 'D':
    filter(DILATE);
    break;
  case 'e':
  case 'E':
    filter(ERODE);
    break;
  case 'p':
  case 'P':
    post+=1;
    filter(POSTERIZE,post);
    break;
  case 't':
  case 'T':
    th+=.1;
    filter(THRESHOLD,th);
    break;
  case 'o':
  case 'O':
    filter(OPAQUE);
    break;
  case 'G':
  case 'g':
    filter(GRAY);
    break;
  case 'R':
  case 'r':
    fileChosen=false;   
    break;
  case 'S':
  case 's':
  saveFile();  
  break;
  case 'X':
  case 'x':
    exit();
  break;  
  default:
    filter(INVERT);
  }
  b=get();
}

void keyPressed(){
  if(fileChosen){
    if(key=='h'||key=='H'){
      if(showHelp){
        image(b,0,0,width,height);
      }
      if(!showHelp){
        b=get();
      }
      showHelp=!showHelp;
    }
    if(key=='I'||key=='i'||key=='g'||key=='G'||key=='E'||key=='e'||key=='B'||key=='b'
      ||key=='D'||key=='d'||key=='P'||key=='p'||key=='T'||key=='t'||key=='O'||key=='o'
      ||key=='R'||key=='r'||key=='S'||key=='s'||key=='x'||key=='X'){  
      doFilter(key);
    }
  }
}