# I'm trying to convert a fractal tree program from processing to p5js

Hello, I’m quite new to both processing and p5.js. I am experimenting with this demo on the processing site `https://processing.org/examples/tree.html`. I got it working in processing and want to publish it on my blog, but to do that I need to convert to p5.js. I have tried to do it but got an error with the mouse event ( I think that it is what it is called), so can someone help steer me in the right direction? Thanks. This is the code

``````var theta;

function setup() {
createCanvas(650, 600);
noStroke();
background(23, 100, 240);

var x = 0;
while(x < width){
var y = 0;
while(y < height){
stroke(4);
stroke(204, 102, 0);
fill(345,random(78, 140), random(100,255),random(4,255));
ellipse(x + 20, y + 20, 38, 38);
y = y + 20;
}
x = x + 20;
}
}

function draw() {
background(204, 102, 153);
frameRate(30);
stroke(255);
var a = (mouseX / (var) width) * 90f;
var x = 0;
while(x < width){
var y = 0;
while(y < height){
stroke(3);
stroke(255, 0, 255, 2);
fill(45,random(78, 34), random(100,25),random(4,30));
ellipse(x + 20, y + 20, 38, 38);
y = y + 20;
}
x = x + 20;
}
translate(width/2,height);
strokeWeight(4);
stroke(random(200,255),random(100,255),random(40,204));
line(0,0,0,-200);
translate(0,-200);
branch(200);

//saveFrame("line-######.png");

}

function branch(h) {

h *= 0.66;

if (h > 2) {
push();
rotate(theta);
stroke(random(200,255),random(100,255),random(40,204));
line(0, 0, 0, -h);
translate(0, -h);

branch(h);
pop();

push();
rotate(-theta);
stroke(random(200,255),random(100,255),random(40,204));
line(0, 0, 0, -h);
translate(0, -h);
branch(h);
pop();
}
}
``````

I get an error on line 29, and I changed float to var, but it says unexpected token var.

1 Like

What exact error do you get? Which line is line 29?

Also you might want to check out Processing.js if you want to deploy your Processing sketch to the web.

2 Likes

changing what you have on line 29 to:

``````	var a = (mouseX / width) * 90.0;
``````

seems to do the trick! it seems like you did a string replacement of ‘float’ -> ‘var’, and this one got left behind!

2 Likes

Thank you so much! I can’t believe I didn’t see that. I guess I was overthinking things. Though, it makes sense now 