main.js

let WinSize = {Width : 600,Height: 700};
let Obstacles = JSON.parse('[{"points":[{"x":0.3276250076293945,"y":0.3400073537826538},{"x":0.25762500762939455,"y":0.1940073537826538},{"x":0.17762500762939454,"y":0.2920073537826538}]},{"points":[{"x":0.8036250076293945,"y":0.04600735378265381},{"x":0.6336250076293946,"y":0.1320073537826538},{"x":0.5296250076293946,"y":0.1380073537826538},{"x":0.6676250076293946,"y":0.2560073537826538},{"x":0.6676250076293946,"y":0.2560073537826538}]},{"points":[{"x":0.8216250076293945,"y":0.4400073537826538},{"x":0.7496250076293945,"y":0.4140073537826538},{"x":0.6936250076293945,"y":0.5380073537826539},{"x":0.7816250076293946,"y":0.7260073537826538},{"x":0.9096250076293946,"y":0.4200073537826538},{"x":0.8216250076293945,"y":0.4400073537826538}]},{"points":[{"x":0.25762500762939455,"y":0.7320073537826538},{"x":0.13962500762939453,"y":0.7280073537826538},{"x":0.15562500762939452,"y":0.5000073537826538},{"x":0.2836250076293945,"y":0.45600735378265383},{"x":0.21562500762939454,"y":0.6200073537826538}]},{"points":[{"x":0.15562500762939452,"y":0.1480073537826538},{"x":0.12962500762939452,"y":0.07000735378265381},{"x":0.24362500762939454,"y":0.09800735378265381}]},{"points":[{"x":0.31362500762939455,"y":0.9100073537826538},{"x":0.4076250076293945,"y":0.8140073537826538},{"x":0.43362500762939454,"y":0.9340073537826538}]},{"points":[{"x":0.8456250076293945,"y":0.9220073537826539},{"x":0.6736250076293945,"y":0.8960073537826538},{"x":0.6196250076293945,"y":0.9120073537826539},{"x":0.5996250076293945,"y":0.7880073537826539},{"x":0.7156250076293945,"y":0.7900073537826539}]}]');

function Parse(){
    Paths.length = 0;
    for(let i in Obstacles){
        let p = new Path();
        p.Points = Obstacles[i].points.map(a=>{
            return {x:a.x *  WinSize.Width,
            y:a.y * WinSize.Height};
        });
        Paths.push(p);
    }
    let p = new Path();
    p.Points.push(new Point(0,0));
    p.Points.push(new Point(WinSize.Width,0));
    p.Points.push(new Point(WinSize.Width,WinSize.Height));
    p.Points.push(new Point(0,WinSize.Height));
    Paths.push(p);
}

function windowResized(){
    WinSize = {Width : Math.min(600,windowWidth),Height: Math.min(windowHeight,700)}
    resizeCanvas(WinSize.Width,WinSize.Height);
    Parse();
}



function setup(){
    WinSize = {Width : Math.min(600,windowWidth),Height: Math.min(windowHeight,700)}
    createCanvas(WinSize.Width ,WinSize.Height);
    Parse();
}


function draw(){
    clear();
    background(0,0,0);

    for(let i in Paths){
        Paths[i].Draw();
    }

    let point = {x:Math.min(Math.max(mouseX,1),WinSize.Width-1),y: Math.min(Math.max(mouseY,1),WinSize.Height-1)};
    
    if(Paths.length > 0){
        fill(255,255,255,64);
        stroke(255,255,255,64);
        strokeWeight(0.5);

        for(let i = 0; i < 8; ++i){

            let p = {x:point.x + 10*Math.cos(0.25*Math.PI*i),y:point.y + 10*Math.sin(0.25*Math.PI*i)};

            let LightPath = GetLightPath(p,Paths);
            beginShape();
            for(let i of LightPath){
                vertex(i.x,i.y);
            }
            endShape(CLOSE);

        }
    }

    fill(255,255,255);
    for(let i = 0; i < 8; ++i){
        let p = {x:point.x + 10*Math.cos(0.25*Math.PI*i),y:point.y + 10*Math.sin(0.25*Math.PI*i)};
        circle(p.x,p.y,5);
    }
}