From Finger Signal to Gesture

Q1. Tap, stage 1: What physical change does a finger produce on a capacitive touchscreen?
- It changes the local electrical field or capacitance
- It presses a mechanical switch beneath the glass
- It emits a radio signal that the screen receives
- It changes the screen's image directly
Answer: It changes the local electrical field or capacitance
Q2. Tap, stage 2: What does the touchscreen controller do with the electrical change?
- It measures the change and computes a touch coordinate
- It labels the action as a tap without measuring it
- It draws the application's response immediately
- It converts the finger into a physical button press
Answer: It measures the change and computes a touch coordinate
Q3. Tap, stage 3: What makes the interaction a tap rather than merely a detected touch point?
- Software interprets the measured touch event as a brief tap
- The finger creates a second electrical field
- The controller permanently stores the touch coordinate
- The display increases its brightness at the contact point
Answer: Software interprets the measured touch event as a brief tap
Q4. Swipe, stage 2: Which controller data is most important for identifying movement across the screen?
- Touch coordinates measured at successive times
- The color of the pixels under the finger
- The application's chosen animation
- The speaker's audio output
Answer: Touch coordinates measured at successive times
Q5. Swipe, stage 3: How does software identify a swipe?
- It interprets a sequence of changing touch coordinates as directed movement
- It treats any single electrical change as a completed swipe
- It identifies the gesture from screen brightness alone
- It waits for the display to change before measuring touch
Answer: It interprets a sequence of changing touch coordinates as directed movement
Q6. Pinch, stage 3: What pattern in controller measurements can software interpret as a pinch?
- Two touch points whose separation changes over time
- One stationary touch point with no time sequence
- A single touch point with a fixed coordinate
- A display image changing without touch measurements
Answer: Two touch points whose separation changes over time

From Finger Signal to Gesture

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