PointerEvent.tangentialPressure - Web APIs 编辑

The tangentialPressure read-only property of the PointerEvent interface represents the normalized tangential pressure of the pointer input (also known as barrel pressure or cylinder stress).

Syntax

var tanPressure = pointerEvent.tangentialPressure;

Return value

A float representing the normalized tangential pressure of the pointer input in the range -1 to 1, inclusive, where 0 is the neutral position of the control.

Note that some hardware may only support positive values in the range 0 to 1. For hardware that does not support tangential pressure, the value will be 0.

Example

In this snippet, when a pointerdown event is fired, different functions are called depending on the value of the event's tangentialPressure property.

someElement.addEventListener('pointerdown', function(event) {
  if (event.tangentialPressure == 0) {
    // No pressure
    process_no_tanPressure(event);
  } else if (event.tangentialPressure == 1) {
    // Maximum pressure
    process_max_tanPressure(event);
  } else {
    // Default
    process_tanPressure(event);
  }
}, false);

Specifications

Browser compatibility

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See also

• Touch.force