ランダムの風景

/**
* landspace of randomness
*
* @author aa_debdeb
* @date 2016/08/01
*/

void setup(){
  size(500, 500);
  noFill();
  mousePressed();
}

void draw(){}

void mousePressed(){
  float[][] values = new float[width][height];
  for(int x = 0; x < width; x++){
    for(int y = height - 1; y >= 0; y--){
      if(x == 0 && y == height - 1){
        values[x][y] = random(100, 200);
      } else if(y == height - 1){
        float vleft = values[x - 1][y];
        float v = vleft + random(-30, 30);
        v = constrain(v, 0, 255);
        values[x][y] = v;
        if(v < vleft){
          stroke(map(vleft - v, 0, 30, 0, 50));
        } else {
          stroke(v);
        }
      } else if(x == 0){
        float vdown = values[x][y + 1];
        float v = vdown + random(-30, 30);
        v = constrain(v, 0, 255);
        values[x][y] = v;
        if(v < vdown){
          stroke(map(vdown - v, 0, 30, 0, 50));
        } else {
          stroke(v);
        }
      } else {
        float vleft = values[x - 1][y];
        float vdown = values[x][y + 1];
        float v = (vleft + vdown) / 2.0;
        v += random(-30, 30);
        v = constrain(v, 0, 255);
        values[x][y] = v;
        if(v < vleft ||  v < vdown){
          if(vleft < vdown){
            stroke(map(vdown - v, 0, 30, 0, 50));
          } else {
            stroke(map(vleft - v, 0, 30, 0, 50));          
          }
        } else {
          stroke(v);
        }
      }
      point(x, y);
    }
  }
}