使用这些像素坐标用于渐变标绘的地图中，随后图像将被加注普通框、图像和直线。

Using these pixel coordinates for the shaded plotted map, the image is then annotated with the usual boxes, images, and lines.

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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 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.

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输入框背景中淡淡的垂直线性渐变。

Light vertical linear fade in each input box background.

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