A canvas, on the other hand, converts the shapes to ( (pixel))s (colored dots on a raster) as soon as they are drawn and does not remember what these pixels represent. The only way to move a shape on ...

核心架构请查阅 canvas-select 组件，一个用于图片标注的 javascript 库，基于 canvas，简单轻量，支持矩形、多边形、点、折线、圆形标注、网格标注。 使用离屏 canvas 绘制静态背景图片 ...