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JS

              
                const frame = new Frame("fit", 1024, 768, darker, dark);
frame.on("ready", ()=>{ // ES6 Arrow Function - similar to function(){}
    zog("ready from ZIM Frame"); // logs in console (F12 - choose console)

    // often need below - so consider it part of the template
    let stage = frame.stage;
    let stageW = frame.width;
    let stageH = frame.height;

    // REFERENCES for ZIM at http://zimjs.com
    // see http://zimjs.com/learn.html for video and code tutorials
    // see http://zimjs.com/docs.html for documentation
    // see https://www.youtube.com/watch?v=pUjHFptXspM for INTRO to ZIM
    // see https://www.youtube.com/watch?v=v7OT0YrDWiY for INTRO to CODE

    // CODE HERE
	
		// This feature uses Box2D for physics 
		// and the ZIM physics.js helper file 
		// As of ZIM 10, physics is integrated into ZIM and the docs
		// see examples here https://zimjs.com/physics
   
		// This app is for the CodePen Challenge on Polygons
    // There is a Box2D polygon shape
    // but this would not let objects inside
    // and ZIM only automatically maps Triangle, Rectangle, Circle
    // You can custom map the polygon with setMap() if desired

    // SO... the plan is to make a Polygon with a Blob
    // setting the controlType to none
    // which makes straight lines from point to point.
    // Then add Rectangle objects along the lines
    // with physics added and join them with a weld joint.
    // This means we can put things inside! (or outside)


    const width = 30; // width of polygon sides
		// we will put all the parts in a Container 
		// so we can easily remove them to change polygons
    let holder = new Container(stageW, stageH).addTo();
    // The number of sides can be set from 3-8 with the tab controls
    let startNum = 5;
    let joints; // for storing joints to remove later

    // Make a physics world
    // requires Box2D and ZIM physics.js helper
    const physics = new Physics(0); // no gravity

    // create a function to make the polygon
    // because we need to change the sides
    // with the tab controls later
    makePoly(startNum);
    function makePoly(points) {

        let poly = new Blob({
            points:points,
            borderWidth:width,
            borderColor:blue,
            controlType:"none",
            interactive:false
        }).transformPoints("scale", 2).center(holder);

        // find the distance between points
        let p0 = poly.pointControls[0];
        let p1 = poly.pointControls[1];
        let length = dist(p0, p1);
        // above is ZIM dist() function - or use
        // let length = Math.sqrt((p0.x-p1.x)**2 + (p0.y-p1.y)**2);
        let angle = 360 / points; // for a regular polygon

        // We will loop through the control points
        // but we need to know the last point
        // so we can make and position lines as we go
        // Controls are inside Blob so get global points
        let firstPoint = p0.localToGlobal(0, 0); // where is the 0,0 globally
        let lastPoint = firstPoint;
        let lastRect = null;
        let firstRect = null;
        joints = [];

        // need two points each time to make a rectangle between
        // so skip the first point...
        // then need to do one more after the loop
        loop(poly.pointControls, (point, i)=>{
            if (i==0) return; // like a continue in a for loop
            let thisPoint = point.localToGlobal(0, 0);
            makeRect(lastPoint, thisPoint, i);
            lastPoint = point.localToGlobal(0, 0);
        });
        makeRect(lastPoint, firstPoint, points); // the one more

        function makeRect(lastPoint, thisPoint, num) {
            // find half way between this point and last point
            let midPoint = new Point(
                thisPoint.x+(lastPoint.x-thisPoint.x)/2, // part way between points
                thisPoint.y+(lastPoint.y-thisPoint.y)/2
            );

            // Adjust for Blob start angle
            // let rectAngle = angle*(num-3);
            // works hard coded for 5 sides
            // but to make it work for any points use this - yum!
            // this will be 2,2,3,3,4,4 for num points from 3-8
            // and then Blob always start with point0 at top
            // and we must subtract half the angle on even numbers - sigh.
            let rectAngle = angle*(num-Math.ceil(points/2))-(points%2==0?angle/2:0);

            let rect = new Rectangle(length, width, faint) // set to color to see
                .centerReg(holder)
                .loc(midPoint) // passing in an object with an x and y works for loc
                .rot(rectAngle)
                .addPhysics();
            if (!lastRect) {
                firstRect = rect;
            } else {
                joints.push(physics.join(rect, lastRect, thisPoint));
            }
            lastRect = rect;
        }
        joints.push(physics.join(firstRect, lastRect, firstPoint));

        // need to make poly follow welded rectangles
        // easiest way is to weld something at registration of poly
        // we don't want the circles inside to interact with this
        // so set the maskBits to another bit setting (2,4,8,16,etc.)
        // default is 1 for all physics shapes - but can set categoryBits to adjust
        let marker = new Circle(1, clear).loc(poly, null, holder).addPhysics({maskBits:2});
        joints.push(physics.join(firstRect, marker, firstPoint));

        // now make poly follow and rotate based on our marker
        physics.Ticker.add(()=>{
            // poly.loc(marker); works until we added controls to remake poly
            // then introduced a bug where when we remove poly,
						// this ticker adds it again to the stage!
            // so make sure the loc does not add polly with the add:false
            poly.loc({x:marker.x, y:marker.y, add:false}).rot(marker.rotation);
        });

        // Add a bunch of circles inside - or whatever...
        let colors = series(pink,green,red,orange,brown,yellow);
        interval(70, obj=>{
            new Circle({min:20, max:30}, colors)
                .center(holder)
                .addPhysics()
                .impulse( // push them in different directions
                    rand(3,5,null,true), // negative too
                    rand(3,5,null,true)
                );
            // normally, the end count == total
            // but when you start right away, the count starts at 0
            // so the end count == total-1
            if (obj.count == obj.total-1) {
                physics.drag();
                holder.cur();
            }
        }, 12, true); // run 12 times and start right away

    } // end make physics

    const controls = new Tabs({
        tabs:[3,4,5,6,7,8],
        width:350,
        selectedBackgroundColor:green,
        selectedColor:darker
    })
        .centerReg()
        .pos(null,30,null,true)
        // make poly hit interface! false is not dynamic (static)
        .addPhysics(false)
        .change(()=>{
						// stop the drag while we add circles
            physics.noDrag();
            holder.cur("default");
						// remove old joints and physics mappings
            loop(joints, joint=>{
                physics.break(joint);
            })
            loop(holder, child=>{
                if (child.physics) { // actual Blob does not get physics
                    child.removePhysics();
                }
            });
            holder.removeAllChildren();
            makePoly(Number(controls.text));
        });
    controls.selectedIndex = startNum-3; // starting tabs at 3 poly lines

    new Label({text:"ZIM - Physics Polygon with Drag", color:white}).alp(.7).pos(30,30).bot();

  
    // DOCS FOR ITEMS USED
		// https://zimjs.com/docs.html?item=Frame
		// https://zimjs.com/docs.html?item=Physics
		// https://zimjs.com/docs.html?item=addPhysics
		// https://zimjs.com/docs.html?item=Container
		// https://zimjs.com/docs.html?item=Circle
		// https://zimjs.com/docs.html?item=Rectangle
		// https://zimjs.com/docs.html?item=Blob
		// https://zimjs.com/docs.html?item=Label
		// https://zimjs.com/docs.html?item=Tabs
		// https://zimjs.com/docs.html?item=change
		// https://zimjs.com/docs.html?item=drag
		// https://zimjs.com/docs.html?item=noDrag
		// https://zimjs.com/docs.html?item=loop
		// https://zimjs.com/docs.html?item=cur
		// https://zimjs.com/docs.html?item=pos
		// https://zimjs.com/docs.html?item=bot
		// https://zimjs.com/docs.html?item=alp
		// https://zimjs.com/docs.html?item=rot
		// https://zimjs.com/docs.html?item=addTo
		// https://zimjs.com/docs.html?item=centerReg
		// https://zimjs.com/docs.html?item=center
		// https://zimjs.com/docs.html?item=rand
		// https://zimjs.com/docs.html?item=loop
		// https://zimjs.com/docs.html?item=interval
		// https://zimjs.com/docs.html?item=dist
		// https://zimjs.com/docs.html?item=Point
		// https://zimjs.com/docs.html?item=series
		// https://zimjs.com/docs.html?item=zog
		// https://zimjs.com/docs.html?item=Ticker
  
    // FOOTER
    // call remote script to make ZIM Foundation for Creative Coding icon
    createIcon(frame); 

}); // end of ready
              
            
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