function Path_Line(from,to,end = null) { this.from = from; this.to = to; this.end = end; this.to_segment = function(prev) { var html = "" if(!prev){ html += "M"+this.from+" "; } else if(prev){ if(prev.end){ if(!prev.end.is_equal(this.from)){ html += "M"+this.from+" "; } } else if(prev.to){ if(!prev.to.is_equal(this.from)){ html += "M"+this.from+" "; } } } html += "L"+this.to+" " if(this.end){ html += "L"+this.end+" " } return html } }