Overview Drawing Area

This feature is very powerful. It helps you not only draw Diagrams/Graphs, but also insert any formula at any position and rotation. In case the supported Latex Layout is not enough, you always have this option as a free-style layout.

Step 1: To insert a Drawing Area into Math Editor, click . A Grid View will appear as shown below:

Step 2: When the Drawing Area appears, the menu bar will change into:

Click (1) to turn on/off the grid view of the drawing area
Drag (2) to the left/right to modify the square size of the grid
Click (3) to snap formulas to the grid when moving them with the mouse
Click (4) to turn on/off the grid only on editing
Click (5) to save any math formula in Math Mode Notice: Zoom mode for objects in Drawing Area is not yet supported.

Tool bar

The Tool bar is a collection of action bars that provides many options for drawing on the Drawing Area. You can find its options shown below.

Text

Display Text in Drawing Area

Step 1: Click on the tool bar to insert a Text Box into the Drawing Area (all text in the Drawing Area is in Math Mode; Text Mode is not supported yet). You will see something like this: Step 2: Click on the Text Box object that has just appeared. The menu bar will change to:

Click (1), (2), (3) to set/remove the Text Box’s border. Border styles include Rectangle, Ellipse, and Circle
Click (4) to adjust border-width ( multiple border sizes included thin, medium, thick…)
Click (5) to set border-color
Click (6) to fill in the Text Box’s background-color
Drag (7) to the left/right to rotate a Text Box
Click (8) to change text-color
Click (9) to change font-size
Click (10) to remove the Text Box object from the Drawing Area

Border

Step 1: Click (1) to turn border-style into a Rectangle:

Drag to the left/right to round the edges of a Text Box’s border by adjusting the corner radius Click to apply frame-stroke-style

Step 2: Click (2) to change border-style into an Ellipse

Step 3: Click (3) to change border-style into a Circle

Connected Arrow

There are various options you can modify for Arrow:

Click (1), (2), (3) to switch between Straight Line, or Curve Line, or Curve Line with 2 control points
Click (4), (5) to change Arrow Tail/Head A common scenario is wanting a hole in the middle of an arrow. Click (6) to achieve that
You will see 2 more options that allow you to change the position and size of the hole. Click and drag to increase/decrease the value, or double-click to change the value directly
Click (7) to change arrow thickness, and (8) to change arrow color
Click (9) to remove the connected arrow object from the Drawing Area

Commutative Diagram

The app supports features to quickly create a Commutative Diagram by following the steps below: Step 1: Insert a Text Box into the Drawing Area. You will see something like this:

Step 2: Insert another Text Box and move it to the right of the first one. Select the first Text Box. You will notice 3 arrows around the textbox. Click on any of them and drag to the position of the second textbox to create a connecting arrow. You can then double-click on a textbox to modify the text inside. Continue with the same steps to create something like the diagram below:

Step 3: By combining Connected Arrow options, you can create a Diagram like the one below:

Line

You can find many types of lines on the toolbar:

Straight Line

There are many options you can use to modify it, as shown below:

Click (1) and (2) to select styles of head/tail of a line
Click (3) adjust line-width
Click (4) to set line-color
Click (5), (6) to add/remove a point (after adding one more point, the line will turn into a three-point shape)
Click (7) to show collisions between two or more shapes
Click (8) to hide collision points
Click (9) to arrange the front/back order of a line object (relative to other objects)
Click (10) to remove a line from the Drawing Area

Curved Line

Click on the curved line to see two points. Each point is connected to an attached point on the tangent of the curve. The attached point can be adjusted to create smooth curves.
Click to bend the curve in reverse
Refer to the Straight Line options for other options

Arrow

Straight Arrow

Straight arrow inherits the basic options of an arrow with a modified head.

Curved Arrow

Curved arrow inherits the basic options of a curved arrow with a modified head.

Shape

You can find many types of shapes on the toolbar:

and

Circle

When you click on the circle, four points at each corner will appear, allowing you to modify the size of the circle. Options for a Circle Shape are shown below:

Click (1) to adjust border-width ( multiple border sizes included thin, medium, thick…)
Click (2) to set the circle’s border-color
Click (3) to fill in the circle’s background-color
Click (4) to apply frame-stroke-style
Drag (5) to the left/right to rotate a circle
Click (6) to show collisions between two or more shapes
Click (7) to hide collision points
Click (8) to arrange the front/back order of a line object (relative to other objects)
Click (9) to remove a line from the Drawing Area

Ellipse

Options for an Ellipse Shape are mostly the same as for a Circle Shape, except that when modifying the size, both width and height can be adjusted independently, whereas for a circle only the radius can be modified

Segment of Ellipse (Arc)

Arc is used to display an angle in geometry. Compared to a circle, when you click on the segment, two yellow points will appear that allow you to adjust the length of the segment. Options for a segment are shown below:

Click to show/hide two radii that start from the center of the ellipse and end at the two endpoints of the arc
Refer to the Circle options for other options Step 1: Insert a line into the Drawing Area, click on [icon] to add one more point to the line, and adjust the shape into an angle Step 2: Insert a segment and rotate it until it fits the angle

Step 3: By combining circle shapes, lines, and segments, you can create a complex shape like the one below:

Rectangle

There are many options for rectangle:

Drag to the left/right to round the edges of a rectangle’s border by adjusting the corner radius
Other options can be found in the Circle options
These are shapes that are related to rectangle

Square

Refer to the Rectangle options for Square options.

Polygon

Options for polygon are shown below:

Click to add/remove a point (after adding one more point, the polygon will gain one more side)
Other options can be found in the Circle options

Regular polygon

Options for Regular polygon:

Click to add/remove a side of a regular polygon
Other options can be found in the Circle options

Polycurve

Click on the tool bar to insert a Polycurve. Options for Polycurve:
Click to bend the curve in reverse
Other options can be found in the Circle options

Axis

Axis and other types of coordinates are shown on the tool bar. Click to see more options. Options for the Cartesian coordinate system are shown below: