Structure describing the status of a finger touching the screen.
Devices can track a number of different pieces of data about a touch on a touchscreen, including its phase (ie, whether it has just started, ended or moved), its position and whether the touch was a single contact or several taps. Furthermore, the continuity of a touch between frame updates can be detected by the device, so a consistent ID number can be reported across frames and used to determine how a particular finger is moving.
The Touch struct is used by Unity to store data relating to a single touch instance and is returned by the Input.GetTouch function. Fresh calls to GetTouch will be required on each frame update to obtain the latest touch information from the device but the fingerId property can be used to identify the same touch between frames.
See Also: Input.GetTouch, TouchPhase enum.
| altitudeAngle | Value of 0 radians indicates that the stylus is parallel to the surface, pi/2 indicates that it is perpendicular. |
| azimuthAngle | Value of 0 radians indicates that the stylus is pointed along the x-axis of the device. |
| deltaPosition | The position delta since last change. |
| deltaTime | Amount of time that has passed since the last recorded change in Touch values. |
| fingerId | The unique index for the touch. |
| maximumPossiblePressure | The maximum possible pressure value for a platform. If Input.touchPressureSupported returns false, the value of this property will always be 1.0f. |
| phase | Describes the phase of the touch. |
| position | The position of the touch in pixel coordinates. |
| pressure | The current amount of pressure being applied to a touch. 1.0f is considered to be the pressure of an average touch. If Input.touchPressureSupported returns false, the value of this property will always be 1.0f. |
| radius | An estimated value of the radius of a touch. Add radiusVariance to get the maximum touch size, subtract it to get the minimum touch size. |
| radiusVariance | The amount that the radius varies by for a touch. |
| rawPosition | The raw position used for the touch. |
| tapCount | Number of taps. |
| type | A value that indicates whether a touch was of Direct, Indirect (or remote), or Stylus type. |
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