protected virtual void DrawGrid(CGContext context, IViewPort viewPort, IYAxis yAxis, nfloat axisLineStart, nfloat axisLineEnd, GridStyle gridStyle)
{
var Step = gridStyle.Step;
var visibleSourceRangeStart = yAxis.Min - (yAxis.Min % Step) - Step;
var visibleSourceRangeEnd = yAxis.Max - (yAxis.Max % Step) + Step;
var leftAxisX = viewPort.ViewPortRect.Left + gridStyle.Offset.X;
var rightAxisX = viewPort.ViewPortRect.Right - gridStyle.Offset.X;
for (double i = visibleSourceRangeStart; i <= visibleSourceRangeEnd; i += Step)
{
var y = yAxis.GetContentValue(i);
var viewPortPositionY = viewPort.DisplayPositionY((nfloat)y) + gridStyle.Offset.Y;
if (viewPortPositionY >= axisLineStart && viewPortPositionY <= axisLineEnd)
{
DrawHelper.DrawLines(context, new List <CGPoint> {
new CGPoint(leftAxisX, viewPortPositionY), new CGPoint(rightAxisX, viewPortPositionY)
}, gridStyle);
}
}
}
private void DrawLabels(CGContext context, IViewPort viewPort, IYAxis yAxis, nfloat positionX, nfloat axisLineStart, nfloat axisLineEnd, TextStyle textStyle, List <Tuple <double, string> > labels)
{
foreach (var label in labels)
{
var labelY = yAxis.GetContentValue(label.Item1);
var viewPortPositionY = viewPort.DisplayPositionY((nfloat)labelY);
if (viewPortPositionY >= axisLineStart && viewPortPositionY <= axisLineEnd)
{
DrawLabel(context, label.Item2, new CGPoint(positionX, viewPortPositionY), textStyle);
}
}
}