Problem of display in a " for" loop

Processing Beginners
2

Hi,
Actually the draw() function is already a loop that renders an image. See https://processing.org/reference/draw_.html

What you can do is update your a variable once at the beginning of the draw function. For example


int a = 1;
int delta = 10;

void setup() {
  size(640, 600);
  background(51);
}
void draw()
{
  //Background fills the canvas
  background(51);
  fill(255, 212, 0);
  //allows to keep a inside the canvas
  if (a > height) delta = -10;
  else if (a < 0) delta = 10;
  a += delta;

  //print hello world
  text("Hello World", a, a);
}
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