The Canvas API is a low level API for drawing. It lets you create lines, curves, polygons, and circles and fill them in with colors, gradients, and so on.
Canvas API是一个低级画图api，它支持创建直线、曲线、多边形和圆圈，并用彩色、渐变色等填充它们。
The library is feature-rich in functions, including rotation, animation, scaling and drawing curves, rectangles and circles.
功能极其丰富，包括旋转，动画，缩放等。
For example, they divided the design of a fish into head, body and fins, alternating straight lines with curves, triangles and circles.
他们把一条鱼的侧面分割为鱼头、鱼身、鱼鳍几部分，用直线、孤线、三角形和圆圈等来表现。
应用推荐