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。

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You can create a visible grid to aid in page layout using the guidelines feature of your page layout software or by drawing lines or boxes that you place on a non-printing layer of your publication.

你可以创建可见的网格来辅助页面排版：你的页面排版软件有辅助线的功能，或者你可以在非打印层绘制边线或方块。

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By representing a building on an isometric grid, the drawing can present details in the foreground and background on a uniform plane, aligned to the parallel lines of the grid.

用一个正方形格子来表示建筑物，将前景与背景画在统一的平面上，依照格子的平行线排好。

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" The perception of human dignity, Mr. Pinker went on, is no different from how "converging lines in a drawing are a cue for the perception of depth.

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Within the app, you can record your own swing using your device's camera and replay it, including in slow motion and reverse, while drawing lines on the screen to monitor your positions, just like Johnny Miller.

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"You have an agency that comes in and is pretty aggressive on these issues, but isn't really clear on drawing lines, " he said.

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