Predefined Variables

Predefined variables are a set of variables that are always accessible in your prototypes. The values they store update automatically.

For example, the value of $mouseX will always change automatically, depending on wherever the cursor finds itself.

Learn more about using variables.

• $mouseXx-coordinate of the cursor.
• $mouseYy-coordinate of the cursor.
• $touchXx-coordinate of where a touch is registered.
• $touchYy-coordinate of where a touch is registered.
• $touchVelocityVelocity of a touch using a finger or mouse that is in movement.
• $touchVelocityXx-component of the velocity of a touch using a finger or mouse that is in movement.
• $touchVelocityYy-component of the velocity of a touch using a finger or mouse that is in movement.
• $touchPointerCountNumber of fingers touching the screen.
• $keyboardHeightHeight of a native keyboard on a smart device when it is visible. Learn more about the input layer.
• $deviceOSOperating system of the device the prototype is running on.
• $piPi (3.141592).
• $timeTime (seconds) passed since the prototype started. If you want to know the time passed since a certain event, assign the time when the event occurs to a variable and deduct it from $time.
• $voiceTranscriptIncoming speech whenever listening to voice commands is enabled. Learn more about voice prototyping.
• $deviceHeightdisplays the height of the device.
• $deviceWidthdisplays the width of the device.

  The device width and device height of a device represent its screen size (resolution size), not the viewport size. For example, an iPhone 14 Pro has a resolution of 390x844 @3x, so its device width x device height is 1170x2532 (i.e., (390x3)x (844x3)).

  Therefore, the preset size and the device size are not related. If you run a pie that is preset to iPhone 13 on an iPhone 14, the device size of the iPhone 14 will be displayed. Check out this example to learn more.

• $qrValuereturns the value stored in a QR code after it has been scanned using the QR & Barcode Scanner. Learn more about the QR Code Scanner.
• $qrHeightreturns the height stored in a QR code after it has been scanned using the QR & Barcode Scanner. Learn more about the QR Code Scanner.
• $qrWidthreturns the width stored in a QR code after it has been scanned using the QR & Barcode Scanner. Learn more about the QR Code Scanner.
• $qrXreturns the x-coordinate stored in a QR code after it has been scanned using the QR & Barcode Scanner. Learn more about the QR Code Scanner.
• $qrYreturns the y-coordinate stored in a QR code after it has been scanned using the QR & Barcode Scanner. Learn more about the QR Code Scanner.
• $barcodeValuereturns the value stored in a barcode after it has been scanned using the QR & Barcode Scanner.
• $barcodeHeightreturns the height stored in a barcode after it has been scanned using the QR & Barcode Scanner.
• $barcodeWidthreturns the width stored in a barcode after it has been scanned using the QR & Barcode Scanner.
• $barcodeXreturns the x-coordinate stored in a barcode after it has been scanned using the QR & Barcode Scanner.
• $barcodeYreturns the y-coordinate stored in a barcode after it has been scanned using the QR & Barcode Scanner.