//forest prototype
//Nick Ferro     Sept12 2015

float horizon;
float treeStart = random(0,width);
float treeEnd = 600;
float treeSpace = 25;
float shade = 175;
float x = 0;
float len = 60;
int state = 0;
float a50 =70;
float a210 =200;


void setup(){
size(640,480);
smooth();
background( 100,150,200 );
horizon =  height/4;
fill( 100,200,100 );
noStroke();
  rectMode(CORNER);
  rect( 0,horizon+50, width,height*3/4 );
}

void draw(){
  if (state == 1) { 
    x = 0;
    shade = 175;
    len = 60;
    a50 =70;
    a210 =200;
    background( 100,150,200 );
    fill( 100,200,100 );
    noStroke();
    rectMode(CORNER);
    rect( 0,horizon+50, width,height*3/4 );
    while (x <= 40){
      drawTree(treeStart,250, shade, len);
      treeStart = random(0,width);
      a50 =a50-0.5;
      a210 =a210+.5;
      shade = shade -3;
      x=x+1;
      len = len + 1;
    }
   state = 0;
  }
}

void drawTree(float treeX, float treeY, float trans, float lenin){
  rectMode(CORNER);
  noStroke();
  fill(139,69,19);
  rect(treeX-5, treeY-a50, 10, lenin);
  fill(34,139,34);
  quad(treeX-50, treeY-a50, treeX-25, treeY-100, treeX+25, treeY-100, treeX+50, treeY-a50);
  quad(treeX-40, treeY-100, treeX-15, treeY-150, treeX+15, treeY-150, treeX+40, treeY-100);
  triangle(treeX-30, treeY-150, treeX+30, treeY-150, treeX, treeY-a210);
  noStroke();           //MASK
  fill(0,trans);
  rect(treeX-5, treeY-a50, 10, lenin);
  quad(treeX-50, treeY-a50, treeX-25, treeY-100, treeX+25, treeY-100, treeX+50, treeY-a50);
  quad(treeX-40, treeY-100, treeX-15, treeY-150, treeX+15, treeY-150, treeX+40, treeY-100);
  triangle(treeX-30, treeY-150, treeX+30, treeY-150, treeX, treeY-a210);
}

void keyPressed() {
  if (key == 'r'){
  state = 1;
  }
}