Javascript 线连接动画不适用于ECG

我需要将线与值连接起来，最初工作正常，但在某个点之后动画不工作。它应该类似于ECG图形。图形应该继续，而不停止切片数据

var continueAnimation=true；
$（文档）.ready（函数（）{
sendArray（）；
});
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var constant=351;
        function animate() {

            if (x > data.length - 1) {
                return;
            }

            if (continueAnimation) {
                requestAnimationFrame(animate);
            }

            if (x++ < panAtX) {

                var temp = data[x];
                var final = constant-(temp);
                ctx.fillRect(x, final, 1, 1);
                ctx.lineTo(x, final);
                ctx.stroke();
            } else {

                ctx.clearRect(0, 0, canvas.width, canvas.height);
                ctx.beginPath();  // reset the path


                for (var xx = 0; xx < panAtX; xx++) {
                    var y = data[x - panAtX + xx];
                    var final = constant - (y);
                    ctx.fillRect(xx, final, 1, 1);
                    ctx.lineTo(xx, final);                        
                }
                ctx.stroke();
            }
        }