interaction_scheme.md

Interaction Scheme

Global interactions

• Scroll to move the viewport around

Tool mode change

Key	Action	Interactions
S	Change to select tool	Click to select one element, Drag a point (that can be moved) to move, Drag on empty spaces to use select rectangle to select elements that intersect with the rectangle
V	Change to viewport drag mode	Drag to move the viewport around
P	Change to draw point mode	Click on empty space to draw a free point, click on a place close to a line or intersection to draw the point on line or on the intersection
L	Change to draw line mode	Based on draw point mode, click once to set the first point of line, click the second time to set the second point, and a line will be drawn. When you want to abort the line creation after placing the first point, press Escape
C	Change to draw circle mode	Based on draw point mode, click once to set the center of circle, click the second time to set a point on the circle.

Hot Keys

Key Stroke	Action	Descriptions
1	(In Line Mode) draw straight line
2	(In Line Mode) draw rays
3	(In Line Mode) draw segments
Cmd - A	Select all elements
Cmd - D	Deselect all elements
Cmd - M	Create a mid-point	you need to select exactly two points in order to create this mid-point
Delete or Backspace	Remove all selected
Cmd - Shift - _	Create parallel lines	you need to select exactly one line and whatever many points to draw a parallel line on every selected point
Cmd - Shift - \	Create perpendicular lines	you need to select exactly one line and whatever many points to draw a perpendicular line on every select point
Cmd - H	Hide selection	Hide the selected elements without deleting them
Cmd - Shift - H	Unhide all	Unhide all the hidden elements
Cmd - Z	Undo
Cmd - Shift - Z	Redo
Cmd - Q	Quit
Cmd - W	Quit