Coding Train Tutorial 6.2 while loop question

[Siyue]

float y=0;
float x=0;
void setup() {
  size(800, 800);
}

void draw()
{
  background(200, 20, 90);
 
  y=0;
  while (y<height) {
      if (mouseY<1) {
        y=y+1;
      } else {
        y=mouseY+y;
      }
    }
    //x=x+40;

    fill(200);
    ellipse(x, y, 30, 30);
  }

same as the video did but just change to the y value. what’s the thing that was wrong and how will I improve the thinking structure skill or imaging code?( very beginner question, and I realize the reason I couldn’t make things right is because my "structure of problem solving " is wrong.

[josephh]

Hi @Siyue,

What are you trying to do precisely? Can you link the video / original link that you are talking about?

@Siyue

if (mouseY<1) {

The mouseY value is the y coordinate of the mouse in the canvas. So if your canvas is 800x800 pixels, then mouseY will be between 0 and (800 - 1) pixels. Therefore the above condition will rarely be true since 1 is really small.

[quark]

@Siyue

y=mouseY+y;

Also this will cause y to get very big very quickly

You need to ba able to see the values of x and y as the program runs add the statement
println(x,y); inside the draw() method like this

void draw()
{
  background(200, 20, 90);
 
  y=0;
  while (y<height) {
      if (mouseY<1) {
        y=y+1;
      } else {
        y=mouseY+y;
      }
    }
    println(x,y);  // see what is happening

It should help you find the mistakes in your code logic.

[debxyz]

Hello @Siyue

Linking the video in question to this thread for quick access for anyone with same or similar question in future: