Some matters needing attention on selection of the scale and the sizeofdrawing sheets in CAD for chemical equipment were presented in this paper.
针对化工设备CAD中的比例和图幅选择，故提出应注意的几个问题。
2
You define the fixed sizeof the canvas in the element itself, and then typically you do the actual drawing from a script that uses the canvas API to create visual objects on the canvas.
首先在元素本身中定义画布的固定大小，然后利用使用 canvas API 在画布上创建可视化对象的脚本来实际绘画。
3
An added benefit to the vector nature of Cairo drawing is that vector images tend to be smaller in size.