Project 09: Portrait

//Nicholas Wong
//Section A
//nwong1@andrew.cmu.edu
//Assignment 09


var size = 10 //Default size of stroke

function preload()
{
	//A profile picture
	img = loadImage("https://i.imgur.com/1XXSpjL.png")
}

function setup()
{
	createCanvas(480,480);
	img.loadPixels(); //Load pixels

	//Set modes
	imageMode(CENTER);
	rectMode(CENTER);
	textAlign(CENTER);
	angleMode(RADIANS);

	//Set custom framerate
	frameRate(120)

}

function draw()
{
	//Offset canvas to fit my face in the middle
	translate(-100,10)

	//Get random x and y coordinates
	let x = floor(random(width));
	let y = floor(random(height));

	//Get color of coordinates
	let pix = img.get(x,y);

	//Create strokes
	drawStrokes(x,y,pix);

	drawInstructions();
}

function drawStrokes(x,y,pix)
{
	push();
	translate(100,0) //Recenter canvas
	translate(x,y);
	rotate(revolveMouse(x,y));//Rotate strokes around mouse

	//Draw stroke
	stroke(pix, 128);
	strokeWeight(0.25*size + random(0,2)); //Stroke size influenced by mouse scroll
	line(0,-size + random(0,2),0,size+ random(0,2)); //Stroke length based on mouse scroll
	pop();
}

function revolveMouse(x,y)
{
	//Generates angle from mouse position and (x,y) coordinate
	let dx = mouseX - x;
	let dy = mouseY - y;
	let angle = atan2(dy,dx)
	return angle; //Returns angle
}

function mouseWheel(event)
{
	//Check if scrolling up
	if (event.deltaY < 0)
	{
		size++; //Increase size
	}
	else //Scrolling down
	{
		size -= 1; //Decrease size
	}
}

function drawInstructions()
{
	//Text box at bottom of canvas
	push();
	translate(100,10);
	noStroke();
	fill(0)
	rect(width/2,height-50,285,35)
	fill(255)
	textSize(10)
	text('SCROLL MOUSEWHEEL TO CHANGE STROKE SIZE',width/2,height-47)
	pop();
}