"Grafic functie " - Processing

ID	Autor	Duplicat din	Ultima modificare
`#29`	Gorea Adriana (GoreaAdrianaMihaela)	Grafic functie	Luni, 13 iun 2016, 10:18
function setup() {
	createCanvas(400, 400);
  	
}

function f(x)
{
	//return x*x*x-3*x+2;
	return x*x-4*x+3;
  	//return sin(x) + cos(x);
  	//return 1/x;
  	//return sqrt(abs(x*x - 1));
    //return x - cos(x);
  	//return tan(x);
}

var scala = 9;

/////////////////////////

var pas = -180;

function draw() 
{
  	var segment = 180 / scala; // lungimea segmentului unitate
  	
  	//fundalul
  	background(300);
  	
  	//axele
	line(200,10,200,390);
  	line(10,200,390,200);
  	
  	//marchez unitatile pe axe
  	push();
  	stroke("red");
  	strokeWeight(3);
  	point(200,200);
  	for(var i = 1 ; i <= scala ; i ++)
    {
      	point(200 + i * segment, 200);
      	point(200 - i * segment, 200);
      	point(200, 200 + i * segment);
      	point(200, 200 - i * segment);
    }
  	pop();
  	
  	//abscisa curenta
  	push();
  	stroke("green");
  	strokeWeight(10);
  	point(200 + pas, 200);
  	pop();
  	i1 = 0, j1 = 0, gasit = false;
  	//desenez graficul pana la abscisa curenta
	for(var i = -190 ; i <= pas ; i ++)
    {
      	x = i / segment;
      	y = f(x);
      	j =  - segment*y;
      	if(gasit == false)
        {
      		point(200 + i, 200 + j);
          	gasit = true;
        }
      	else
          	if(abs(j1-j) < 100)
          		line(200+i1, 200+j1, 200+i, 200+j);
     	i1 = i, j1 = j;
    }
  	
  	//naresc abscisa curenta, pentru pasul urmator
  	pas ++;
  	if(pas > 190)
      pas = -190;
}