if(x1<x2){this.pieces.push(new Piece(x1,y1,x2,y2));}},partBelow(y){return this.pieces.reduce((acc,p)=>(acc+p.partBelow(y)),0);},get min(){return this.pieces.reduce((acc,p)=>Math.min(acc,p.min),Infinity);},get max(){return this.pieces.reduce((acc,p)=>Math.max(acc,p.max),-Infinity);},get average(){let weightedSum=0;let totalWeight=0;this.pieces.forEach(function(piece){weightedSum+=piece.width*piece.average;totalWeight+=piece.w...