browser ⟩ canvas ⟩ path ⟩ ctx.polyline()
💾 replit：canvas curves
⬆️ 需要： Vector
// 🔸 ctx.polyline()
CanvasRenderingContext2D.prototype.polyline = function(pts, {
color = 'gray',
lineWidth = 1,
}={}) {
this.save();
this.beginPath();
pts.forEach((p, i) => {
i === 0 ? this.moveTo(...p.coords) : this.lineTo(...p.coords);
});
this.strokeStyle = color;
this.lineWidth = lineWidth;
this.stroke();
this.restore();
};