Android如何实现动态滚动波形图(心电图)功能

  /** 根据网格的单位长宽，获取能绘制网格横线和竖线的数量*/
  gridHorizOntalNum= (int) (mHeight / GRID_WIDTH);
  gridVerticalNum = (int) (mWidth / GRID_WIDTH);

 /**
  * 绘制网格
  *
  * @param canvas
  */
 private void drawGrid(Canvas canvas) {
  /** 设置颜色*/
  mLinePaint.setColor(gridLineColor);
  /** 绘制横线*/
  for (int i = 0; i 

  /** 根据线条长度，最多能绘制多少个数据点*/
  row = (int) (mWidth / WAVE_LINE_WIDTH);
  dataArray = new float[row + 10];

 /**
  * 添加新的数据
  */
 public void showLine(float line) {
  if (draw_index >= row) {
   draw_index = 0;
  }
  switch (drawMode){
   case 0:
    /** 常规模式数据添加至最后一位*/
    dataArray[row - 1] = line;
    break;
   case 1:
    /** 循环模式数据添加至当前绘制的位*/
    dataArray[draw_index] = line;
    break;
  }
  postInvalidate();
 }

 /**
  * 取数组中的指定一段数据来绘制折线
  * @param start 起始数据位
  * @param end 结束数据位
  * */
 private void drawPathFromDatas(Canvas canvas, int start, int end){
  mPath.reset();
  mPath.moveTo(start * WAVE_LINE_WIDTH, mHeight / 2);
  for (int i = start; i  0) {
    if (dataValue > MAX_VALUE) {
     dataValue = MAX_VALUE;
    }
   } else {
    if (dataValue <-MAX_VALUE) {
     dataValue = -MAX_VALUE;
    }
   }
   nowY = mHeight / 2 - dataValue * (mHeight / (MAX_VALUE * 2));
   mPath.lineTo(nowX, nowY);
  }
  canvas.drawPath(mPath, mWavePaint);
 }

allprojects {
  repositories {
   ...
   maven { url 'https://jitpack.io' }
  }
 }

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    data = new Random().nextFloat()*(20f)-10f;
    waveShowView.showLine(data);//取得是-10到10间的浮点数