drawLine method

void drawLine(double? lastPrice, double? curPrice, Canvas canvas, double lastX, double curX, Color color,)

Implementation

void drawLine(double? lastPrice, double? curPrice, Canvas canvas,
    double lastX, double curX, Color color) {
  if (lastPrice == null || curPrice == null) {
    return;
  }
  // 跳过无穷大
  if (!lastPrice.isFinite || !curPrice.isFinite) return;

  //("lasePrice==" + lastPrice.toString() + "==curPrice==" + curPrice.toString());
  double lastY = getY(lastPrice);
  double curY = getY(curPrice);

  // 在这里加一行检查
  if (!(lastX.isFinite && lastY.isFinite && curX.isFinite && curY.isFinite)) {
    // 表示出现了 NaN/Infinity，直接跳过这条线
    return;
  }
  //print("lastX-----==" + lastX.toString() + "==lastY==" + lastY.toString() + "==curX==" + curX.toString() + "==curY==" + curY.toString());
  canvas.drawLine(
      Offset(lastX, lastY), Offset(curX, curY), chartPaint..color = color);
}