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Commit e5d6d043 authored by Wenxin Feng's avatar Wenxin Feng
Browse files

Modify touchpad ballistic curves based on the UX study results. 

We ran the second trackpad ballistic user study to test different designs
of the three ballistic phases. The results suggest a later start of the
acceleration phase. The curves and sensitivities are updated accordingly.

Bug: 288354054
Bug: 289270505
Test: manually
Change-Id: I2012302be44c0ad191951b6950140070cd20a2fb
parent dff3962c

services/inputflinger/reader/mapper/TouchpadInputMapper.cpp

+6 −5
Original line number Diff line number Diff line
@@ -58,13 +58,14 @@ struct CurveSegment { 
};



const std::vector<CurveSegment> segments = {

        {10.922, 3.19, 0},

        {31.750, 4.79, -17.526},

        {98.044, 7.28, -96.52},

        {std::numeric_limits<double>::infinity(), 15.04, -857.758},

        {32.002, 3.19, 0},

        {52.83, 4.79, -51.254},

        {119.124, 7.28, -182.737},

        {std::numeric_limits<double>::infinity(), 15.04, -1107.556},

};



const std::vector<double> sensitivityFactors = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 16, 18};

const std::vector<double> sensitivityFactors = {1,  2,  4,  6,  7,  8,  9, 10,

                                                11, 12, 13, 14, 16, 18, 20};



std::vector<double> createAccelerationCurveForSensitivity(int32_t sensitivity,

                                                          size_t propertySize) {