P-04 String Art

// Bridget Doherty, bpdohert, 104 Section C

// draw at least 3 string art shapes

var dx1;
var dy1;
var dx2;
var dy2;

// line density
var numLines = 40;

// starting line values
var x1 = 0;
var y1 = 0;
var x3 = 0;
var y3 = 300;

// second line values
var x2 = 400;
var y2 = 300;
var x4 = 400;
var y4 = 0;

var mouseClick = 0;

function setup() {
    createCanvas(400, 300);
    background('black');
    blendMode(EXCLUSION);
}

function draw() {
    drawCircles();
    string1();
    string2();
    string3();
    
    noLoop();
}

function drawCircles() {
    for (i = 20; i < width; i+= 40) {
        fill(250);
        noStroke();
        circle(i*1.3, i, 40);
    }
    

}

function string1() {
    for(i = 0; i <= height; i += 10) { 
        stroke('green');
        line(width/2.5, height/2, 0, i);
        line(width/2.5, height/2, width, i);
    }
    for(i = 0; i <= width; i += 10){
        stroke('yellow');
        line(width/3 + width/2, height/2, 0, i);
        line(width/3 + width/2, height/2, width, i);
    }
}

function string2() {
    stroke('blue');
    dx1 = (300-50)/numLines;
    dy1 = (0)/numLines;
    dx2 = (50-300)/numLines;
    dy2 = (300-300)/numLines;
   
    for (var i = 0; i <= numLines; i += 1) {
        line(x1, y1, x2, y2);
        x1 += dx1;
        y1 += dy1;
        x2 += dx2;
        y2 += dy2;
    }   
}

function string3() {
    stroke('cyan');
    dx1 = (300-50)/numLines;
    dy1 = (0)/numLines;
    dx2 = (50-300)/numLines;
    dy2 = (300-300)/numLines;
   
    for (var i = 0; i <= numLines; i += 1) {
        line(x1, y1, x2, y2);
        x1 += dx1;
        y1 += dy1;
        x2 += dx2;
        y2 += dy2;
    }  
}