class MyImage
{
  //image variable
  PImage img;
  
  //pixel arrays
  int[][] pixel = new int[trnWidth][trnHeight];
  int[][] rVal = new int[trnWidth][trnHeight];
  int[][] gVal = new int[trnWidth][trnHeight];
  int[][] bVal = new int[trnWidth][trnHeight];

  float[][] ht = new float[trnWidth][trnHeight];
  
  //constructor
  MyImage(String imgFile,float s)
  {
    img = loadImage(imgFile);                             //load the image
    img.resize(trnWidth,trnHeight);  
    image(img,0,0);
  
    for(int i = 0; i<trnWidth; i=i+1) {                    //read the pixel information
    for(int j = 0; j<trnHeight; j=j+1){
      pixel[i][j] = img.pixels[j*trnWidth + i];
      rVal[i][j] = int(red(pixel[i][j]));
      gVal[i][j] = int(green(pixel[i][j]));
      bVal[i][j] = int(blue(pixel[i][j]));
      ht[i][j] = max(0,bVal[i][j]/s);
    }
  }
}

 void draw()
 {
     for(int i = 0; i<trnWidth; i=i+1) {                    //draw lines of different heights based on the pixel information
     for(int j = 0; j<trnHeight; j=j+1){
      stroke(rVal[i][j],gVal[i][j],bVal[i][j]);
      //line(i + width/2 - trnWidth/2, j + height/2 - trnHeight/2,0,i + width/2 - trnWidth/2,j+ height/2 - trnHeight/2, ht[i][j]);
      line(i, j,0,i ,j, ht[i][j]);
    }
  }
 }
 
 float heightVal(int i, int j)
 {
   i = min(max(0,i),trnWidth-1);
   j = min(max(0,j),trnHeight-1);
   return ht[i][j];
 }
 
 float getRVal(int i, int j)
 {
   i = min(max(0,i),trnWidth-1);
   j = min(max(0,j),trnHeight-1);   
   return rVal[i][j];
 }
 
 float getGVal(int i, int j)
 {
   i = min(max(0,i),trnWidth-1);
   j = min(max(0,j),trnHeight-1);
   return gVal[i][j];
 }
 
 float getBVal(int i, int j)
 {
   i = min(max(0,i),trnWidth-1);
   j = min(max(0,j),trnHeight-1);
   return bVal[i][j];
 }
}