toolbar opens a toolbar to draw Bézier curves. Bézier curves are defined by a start point and an end point, which are called &quot; anchors &quot; . The curvature of the Bézier curve is defined by control points ( &quot; handles &quot; ). Moving a control point changes the shape of the Bézier curve.
打开一个工具栏用于绘制贝赛尔曲线。贝赛尔曲线由称为“标记”的一个起点和一个终点来定义。贝赛尔曲线的曲率由控制点（“控点”）来定义。移动控制点可以修改贝赛尔曲线的形状。