// Chris Jernigan 2012
// CSCI 182 hw2 "Fall Scene"


void setup(){

 size(600,600);
 smooth();
}


 void draw(){

 //Sunset Background
 color c1 = color(#34516C);
 color c2 = color(#FA9D12);
 sunSet(0,0,width,height,c1,c2,1);

   //fading sun
   fill(#CE873A,250);
  ellipse(190,350,30,30);

//background mountains
   mountain(50,-150,#504458);
   mountain(270,-100,#504458);
   mountain(200,-50,#504458);
   mountain(-200,-100,#504458);
   mountain(-200,-100,#504458);

   //bg mountains level 2
   mountain(170,-90,#362650);
   mountain(-100,-50,#362650);

  //bg mountains level 3
   mountain(2,2,#191A3E);
   mountain(200,2,#191A3E);
   mountain(150,-50,#191A3E);
   mountain(-200,2,#191A3E);


   //big hill
   pushMatrix();
   translate(37,0);
   fill(0);
   beginShape();
 curveVertex(20,500);
 curveVertex(-50,650);

 curveVertex(190,400);
curveVertex(300,350);
curveVertex(450,420);

 curveVertex(650,650);
 curveVertex(680,500);
  endShape();
  popMatrix();

  tree(); //tree?

  //falling leaves!
  h1.leaves();
  h2.leaves();
  h3.leaves();
  h4.leaves();
  h5.leaves();
  h6.leaves();
  h7.leaves();
  h8.leaves();
 }

//setting variables for leaves
Leaf h1 = new Leaf(300,300, 2.0);
Leaf h2 = new Leaf(325,300, 1.7);
Leaf h3 = new Leaf(233,300, 1.12);
Leaf h4 = new Leaf(307,300, 1.0);
Leaf h5 = new Leaf(275,300, 1.1);
Leaf h6 = new Leaf(248,300, 1.2);
Leaf h7 = new Leaf(292,300, 1.3);
Leaf h8 = new Leaf(250,300, 0.5);

 //creating leaf object
 class Leaf {
   float xpos,ypos,speed;
   Leaf (float xp, float yp, float s){
   xpos = xp;
   ypos = yp;
   speed = s;
   }

//controls falling of leaves
void leaves(){
  pushMatrix();
  translate(290,100);
   ypos += speed;
    if (ypos >= 300) {
      ypos = 200;
      xpos += random(-100,50);
    }
    if (xpos <= 0 || xpos >= 100){
      xpos = random(150);
    }
    fill(#A54E14,255);
    ellipse(xpos, ypos, 5, 3);
    popMatrix();
 }


 }

 //tree
 void tree(){

  pushMatrix();
  translate(120,80);
  rect(200,210,15,55);
  strokeWeight(10);
  stroke(0);
  line(200,210,180,180);
  line(210,210,240,180);
  line(210,210,200,160);
  line(210,230,215,160);

  noStroke();
  beginShape();
  vertex(187,275);
  vertex(207,260);
  vertex(233,275);
  endShape();

  fill(#CE5A3A,200);
  ellipse(200,180,40,40);
  fill(#F7E23C,100);
  ellipse(190,170,40,40);
  fill(#894E16,200);
  ellipse(220,170,40,40);
  fill(#E84200,100);
  ellipse(220,200,40,40);
  fill(#D9FF08,100);
  ellipse(180,200,50,50);
   fill(#B93E0D,100);
  ellipse(240,200,50,50);


  popMatrix();



}


//mountain object used to create background mountains
void mountain(float m1, float m2, color c){
 fill(c);
 noStroke();
 pushMatrix();
 translate(m1,m2);
 beginShape();
 curveVertex(20,500);
 curveVertex(0,600);

 curveVertex(200,500);
 curveVertex(300,470);
 curveVertex(400,500);

 curveVertex(600,600);
 curveVertex(680,500);
 endShape();
 popMatrix();
}


//Gradient creates sunset effect
int Y_AXIS = 1;
int X_AXIS = 2;
void sunSet(int x, int y, float w, float h, color c1, color c2, int axis ){
  // calculate differences between color components
  float deltaR = red(c2)-red(c1);
  float deltaG = green(c2)-green(c1);
  float deltaB = blue(c2)-blue(c1);

  // choose axis
  if(axis == Y_AXIS){
    /*nested for loops set pixels
     in a basic table structure */
    // column
    for (int i=x; i<=(x+w); i++){
      // row
      for (int j = y; j<=(y+h); j++){
        color c = color(
        (red(c1)+(j-y)*(deltaR/h)),
        (green(c1)+(j-y)*(deltaG/h)),
        (blue(c1)+(j-y)*(deltaB/h))
          );
        set(i, j, c);
      }
    }
  }
  else if(axis == X_AXIS){
    // column
    for (int i=y; i<=(y+h); i++){
      // row
      for (int j = x; j<=(x+w); j++){
        color c = color(
        (red(c1)+(j-x)*(deltaR/h)),
        (green(c1)+(j-x)*(deltaG/h)),
        (blue(c1)+(j-x)*(deltaB/h))
          );
        set(j, i, c);
      }
    }
  }
}