//Shipra Gupta
//Feb 1, 2008
//Chapter Shape 1, Processing (B.Fry, C.Ray)
//Excercise 1 --> create composition with one line and one ellipse
//Excercise 2 --> modify above code to change fill, stroke and background
//Excercise 3 --> create a visual knot with bezier curves only

//SET STAGE
size(780, 200);
background(255);

//----------------------------------------
//EX 1
ellipse(110, 150, 200, 50);
line(110, 150, 110, 20);

//----------------------------------------
//EX 2
//SUNLIGHT
noStroke();
colorMode(RGB);
for(float i = 0; i<200; i++){
  stroke(255, 255, 0+i*1.4);
  line(350-i/1.5, 0+i, 550-i/1.5, 0+i);
}  
//quad(325, 0, 525, 0, 425, 200, 225, 200);

//GNOMON AND BASE
fill(50, 255, 200);
stroke(0);
strokeWeight(1);
ellipse(350, 150, 200, 50);

stroke(255, 0, 0, 150);
strokeWeight(10);
strokeCap(ROUND);
line(350, 150, 350, 20);
stroke(0, 50);
line(350, 150, 220, 210);

//----------------------------------------
//EX 3
//BEZIER KNOT
//illustration reference from
//http://www.josleys.com/articles/ams_article/Lorenz3.htm

stroke(200,0,200, 50);
strokeWeight(10);
noFill();
bezier(650, 60, 750, 70, 750, 200, 650, 160);
bezier(650, 60, 550, 70, 550, 200, 650, 160);

bezier(650, 30, 790, 50, 570, 130, 650, 160);
bezier(650, 30, 510, 50, 730, 130, 650, 160);