drawText method
Implementation
void drawText(Canvas canvas) {
drawGridText(
canvas: canvas,
canvasWidth: canvasWidth,
canvasHeight: canvasHeight,
verticalGrids: 1,
horizontalGrids: 0,
maxValue: maxValue,
minValue: minValue,
paddingTop: 0,
gridTextStyle: textStyle,
lowerStyle: textStyle,
upperStyle: textStyle,
);
}