A SketchCanvas document is a YAML formatted data with a list on the root node. The list contains one or more drawing objects. A drawing object is an element in a sketch, such as a line, a rectangle or a ellipse. A sketch consists of a collection of drawing objects.

Following is a list of drawing object types. All objects have a property named “type” that defines the type of the drawing object.

This object is always the first entry in the root list of the document.

- type: meta
  size: [550, 450]

Currently, this object contains only one property: size. The size defines the dimensions of the sketch, in pixels.

If a SketchCanvas document lacks this object, a meta object with default size: [934, 590] is automatically created.

A simple line with optional color and width specification.

- type: line
  points: '92,140:159,201'
  color: red
  width: 2

• points: A colon-separated list of point coordinates for the line. Currently only 2 points is allowed.
• color: Color of the line. Can be “black”, “blue”, “red” or “white”. If omitted, black is assumed.
• width: Width of the line. Can be 1, 2 or 3. If omitted, 1 is assumed.

A line with arrowhead on one end.

- type: arrow
  points: '71,265:168,214'
  color: blue
  width: 2

Properties are common with line object, except that an arrowhead is drawn on the second point.