software copyright
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jiahong
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/*
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* 自然写互动课堂应用开发SDK软件 V1.0
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* StrokePath - 笔迹路径数据模型
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*
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* 描述：封装一条完整笔画的坐标序列、属性和元数据
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*/
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package com.writech.sdk.model;
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import java.io.Serializable;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* 笔迹路径模型
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* 代表从落笔到抬笔的一条完整笔画数据
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*/
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public class StrokePath implements Serializable {
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private static final long serialVersionUID = 1L;
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/* ========== 采样点内部类 ========== */
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/** 单个笔迹采样点 */
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public static class Point implements Serializable {
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private static final long serialVersionUID = 1L;
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/** X坐标（屏幕像素或物理mm，取决于坐标空间） */
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public float x;
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/** Y坐标 */
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public float y;
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/** 压力值（归一化 0.0~1.0） */
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public float pressure;
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/** 时间戳（相对于笔画开始时间的毫秒偏移） */
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public long timeOffset;
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/** 笔尖倾斜角度（度，0-90，0为垂直，部分笔支持） */
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public float tiltAngle;
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/** 笔尖方位角（度，0-360，部分笔支持） */
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public float azimuthAngle;
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public Point() {}
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public Point(float x, float y, float pressure, long timeOffset) {
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this.x = x;
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this.y = y;
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this.pressure = pressure;
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this.timeOffset = timeOffset;
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}
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@Override
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public String toString() {
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return "(" + x + "," + y + ",p=" + pressure + ",t=" + timeOffset + ")";
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}
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}
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/* ========== 笔画属性 ========== */
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/** 笔画唯一ID */
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private String strokeId;
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/** 来源笔设备MAC地址 */
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private String penMac;
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/** 学生ID */
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private String studentId;
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/** 页面ID（标识书写所在页面） */
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private String pageId;
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/** 笔画开始时间（绝对时间戳毫秒） */
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private long startTimestamp;
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/** 笔画结束时间 */
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private long endTimestamp;
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/** 笔画颜色（ARGB） */
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private int color = 0xFF000000;
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/** 笔画基础线宽（像素） */
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private float baseWidth = 3.0f;
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/** 采样点列表 */
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private List<Point> points;
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/* ========== 分析结果（由OCR/AI引擎填充） ========== */
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/** 识别的文字内容 */
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private String recognizedText;
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/** 识别置信度 */
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private float recognitionConfidence;
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/** 笔顺序号（在整个书写序列中的顺序） */
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private int strokeOrder;
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/** 是否为有效笔画（排除误触等） */
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private boolean isValid = true;
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/* ========== 构造函数 ========== */
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public StrokePath() {
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this.points = new ArrayList<>();
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}
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public StrokePath(String strokeId, String penMac) {
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this.strokeId = strokeId;
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this.penMac = penMac;
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this.points = new ArrayList<>();
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this.startTimestamp = System.currentTimeMillis();
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}
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/* ========== 点操作方法 ========== */
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/** 添加采样点 */
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public void addPoint(float x, float y, float pressure, long timeOffset) {
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points.add(new Point(x, y, pressure, timeOffset));
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}
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/** 添加采样点（含倾斜角） */
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public void addPointWithTilt(float x, float y, float pressure,
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long timeOffset, float tilt, float azimuth) {
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Point p = new Point(x, y, pressure, timeOffset);
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p.tiltAngle = tilt;
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p.azimuthAngle = azimuth;
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points.add(p);
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}
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/** 获取采样点数量 */
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public int getPointCount() {
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return points.size();
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}
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/** 获取指定索引的采样点 */
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public Point getPoint(int index) {
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if (index >= 0 && index < points.size()) {
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return points.get(index);
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}
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return null;
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}
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/** 获取所有采样点 */
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public List<Point> getPoints() {
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return points;
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}
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/* ========== 笔画几何计算 ========== */
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/** 计算笔画总长度（像素） */
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public float calculateLength() {
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float length = 0;
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for (int i = 1; i < points.size(); i++) {
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Point p0 = points.get(i - 1);
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Point p1 = points.get(i);
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float dx = p1.x - p0.x;
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float dy = p1.y - p0.y;
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length += (float) Math.sqrt(dx * dx + dy * dy);
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}
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return length;
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}
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/** 计算笔画包围盒 */
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public float[] getBoundingBox() {
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if (points.isEmpty()) return new float[]{0, 0, 0, 0};
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float minX = Float.MAX_VALUE, minY = Float.MAX_VALUE;
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float maxX = Float.MIN_VALUE, maxY = Float.MIN_VALUE;
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for (Point p : points) {
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if (p.x < minX) minX = p.x;
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if (p.y < minY) minY = p.y;
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if (p.x > maxX) maxX = p.x;
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if (p.y > maxY) maxY = p.y;
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}
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return new float[]{minX, minY, maxX, maxY};
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}
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/** 计算平均书写速度（像素/毫秒） */
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public float calculateAverageSpeed() {
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if (points.size() < 2) return 0;
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float totalLength = calculateLength();
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long duration = points.get(points.size() - 1).timeOffset - points.get(0).timeOffset;
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return duration > 0 ? totalLength / duration : 0;
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}
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/** 计算平均压力 */
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public float calculateAveragePressure() {
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if (points.isEmpty()) return 0;
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float sum = 0;
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for (Point p : points) {
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sum += p.pressure;
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}
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return sum / points.size();
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}
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/** 获取书写持续时间（毫秒） */
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public long getDuration() {
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if (points.size() < 2) return 0;
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return points.get(points.size() - 1).timeOffset - points.get(0).timeOffset;
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}
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/* ========== 序列化方法 ========== */
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/**
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* 将笔画数据序列化为紧凑的二进制格式
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* 用于BLE传输和本地缓存
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*
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* 格式：
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* [4字节 点数][每个点: 4字节x + 4字节y + 2字节pressure + 4字节timeOffset]
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*/
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public byte[] toBytes() {
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int pointCount = points.size();
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byte[] data = new byte[4 + pointCount * 14];
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/* 写入点数（大端序） */
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data[0] = (byte) ((pointCount >> 24) & 0xFF);
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data[1] = (byte) ((pointCount >> 16) & 0xFF);
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data[2] = (byte) ((pointCount >> 8) & 0xFF);
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data[3] = (byte) (pointCount & 0xFF);
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int offset = 4;
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for (Point p : points) {
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/* 写入X坐标（float → 4字节） */
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int fx = Float.floatToIntBits(p.x);
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data[offset++] = (byte) ((fx >> 24) & 0xFF);
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data[offset++] = (byte) ((fx >> 16) & 0xFF);
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data[offset++] = (byte) ((fx >> 8) & 0xFF);
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data[offset++] = (byte) (fx & 0xFF);
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/* 写入Y坐标 */
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int fy = Float.floatToIntBits(p.y);
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data[offset++] = (byte) ((fy >> 24) & 0xFF);
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data[offset++] = (byte) ((fy >> 16) & 0xFF);
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data[offset++] = (byte) ((fy >> 8) & 0xFF);
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data[offset++] = (byte) (fy & 0xFF);
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/* 写入压力值（归一化后*65535转uint16） */
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int pressure16 = (int) (p.pressure * 65535);
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data[offset++] = (byte) ((pressure16 >> 8) & 0xFF);
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data[offset++] = (byte) (pressure16 & 0xFF);
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/* 写入时间偏移（uint32） */
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long t = p.timeOffset;
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data[offset++] = (byte) ((t >> 24) & 0xFF);
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data[offset++] = (byte) ((t >> 16) & 0xFF);
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data[offset++] = (byte) ((t >> 8) & 0xFF);
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data[offset++] = (byte) (t & 0xFF);
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}
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return data;
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}
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/* ========== Getter / Setter ========== */
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public String getStrokeId() { return strokeId; }
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public void setStrokeId(String strokeId) { this.strokeId = strokeId; }
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public String getPenMac() { return penMac; }
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public void setPenMac(String penMac) { this.penMac = penMac; }
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public String getStudentId() { return studentId; }
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public void setStudentId(String studentId) { this.studentId = studentId; }
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public String getPageId() { return pageId; }
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public void setPageId(String pageId) { this.pageId = pageId; }
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public long getStartTimestamp() { return startTimestamp; }
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public void setStartTimestamp(long t) { this.startTimestamp = t; }
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public long getEndTimestamp() { return endTimestamp; }
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public void setEndTimestamp(long t) { this.endTimestamp = t; }
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public int getColor() { return color; }
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public void setColor(int color) { this.color = color; }
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public float getBaseWidth() { return baseWidth; }
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public void setBaseWidth(float w) { this.baseWidth = w; }
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public String getRecognizedText() { return recognizedText; }
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public void setRecognizedText(String text) { this.recognizedText = text; }
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public float getRecognitionConfidence() { return recognitionConfidence; }
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public void setRecognitionConfidence(float c) { this.recognitionConfidence = c; }
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public int getStrokeOrder() { return strokeOrder; }
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public void setStrokeOrder(int order) { this.strokeOrder = order; }
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public boolean isValid() { return isValid; }
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public void setValid(boolean valid) { isValid = valid; }
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@Override
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public String toString() {
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return "StrokePath{id='" + strokeId + "', points=" + points.size()
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+ ", duration=" + getDuration() + "ms"
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+ ", text='" + recognizedText + "'}";
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}
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}
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