Week 2 Flashcards
What are the differences between input devices?
Input devices can vary in indirect control vs. direct control, hard control vs. soft control, linear or rotary input, position or force input, absolute or relative input.
What does degrees of freedom mean?
The amount of directions the input device interacts in. For example a mouse can move on the x and y axis, therefore it has two degrees of freedom.
What does controller resistance mean?
Indirect-control devices can be classified as isometric (stationary with resistance), isotonic (moving with displacement) or elastic (a combination of both).
What does order of control mean?
The property sensed by an input device can be mapped to control position or velocity. It is found that isometric devices are better for rate (velocity), and isotonic devices are better for position.
What is control-display gain?
Control-display gain is a scale factor in mapping input to movement on the display.
CD_gain = V_display / V_control
What is a transfer function and how is it used?
A transfer function transforms mouse movement into movement on the display. It usually consists of the current cursor position (x, y), screen size (h, w) and mouse movement (dx, dy).
What are some differences between display types?
A display can vary in the technology used (CRT vs. OLED), the size of the display, the pixel density and more.
