drawBg method

@override void drawBg(Canvas canvas, Size size)

draw the background of chart

Implementation

@override
void drawBg(Canvas canvas, Size size) {
  Paint mBgPaint = Paint()..color = chartColors.bgColor;
  Rect mainRect =
      Rect.fromLTRB(0, 0, mMainRect.width, mMainRect.height + mTopPadding);
  canvas.drawRect(mainRect, mBgPaint);

  if (mVolRect != null) {
    Rect volRect = Rect.fromLTRB(
      0,
      mVolRect!.top - mChildPadding,
      mVolRect!.width,
      mVolRect!.bottom,
    );
    canvas.drawRect(volRect, mBgPaint);
  }

  for (int i = 0; i < mSecondaryRectList.length; ++i) {
    Rect? mSecondaryRect = mSecondaryRectList[i].mRect;
    Rect secondaryRect = Rect.fromLTRB(
      0,
      mSecondaryRect.top - mChildPadding,
      mSecondaryRect.width,
      mSecondaryRect.bottom,
    );
    canvas.drawRect(secondaryRect, mBgPaint);
  }
  canvas.drawRect(mDateRect, mBgPaint);
}