在触屏上实现。。移动轨迹(

public static final int TRACK_POS_BUF_DEPTH = 3;
public int[][] trackPosBuffer = new int[TRACK_POS_BUF_DEPTH][2];
private short trackBufPos = 0;//must be less than the length of the register!

private void resetTrackPosBuffer() {
for (int i = 0; i < trackPosBuffer.length; i++) {
trackPosBuffer[i][0] = trackPosBuffer[i][1] = 0;
}