private void DrawHorizontalLine(IGridState state, IDrawing drawing, Structs.Size canvasSize, IMargin margin, ref SizeF strY, double valueData, double stepData, bool calcWidth, ref double maxTextSize, StringAlignment align, ref int lastTextPos)
{
double y = this.scaleService.ToScreenY(valueData);
if (y >= 0 && y <= canvasSize.Height - margin.Bottom - margin.Top)
{
if (calcWidth)
{
var strValue = state.ItemFormatter.ToString(Axis.Y, new DataItem(0, valueData), stepData);
var strSize = drawing.MeasureText(strValue);
maxTextSize = maxTextSize < strSize.Width ? strSize.Width : maxTextSize;
strY.Height = strSize.Height;
}
else
{
double lineYPos = canvasSize.Height - margin.Bottom - y; // Invert graphic
var color = valueData != 0 ? state.GridColor : state.AxeColor;
drawing.Line(color, margin.Left, lineYPos, canvasSize.Width - margin.Right, lineYPos);
if (CalcAndCheckLabelRectY(state, canvasSize, margin, ref strY, valueData, align, lineYPos, out Rectangle rect, out bool borderValue))
{
var strValue = state.ItemFormatter.ToString(Axis.Y, new DataItem(0, valueData), stepData);
drawing.Text(state.TextYColor, rect, strValue, StringAlignment.Far, align);
lastTextPos = rect.Top;
}
}
}
}
private void MeashureLabelSizes(IDrawing drawing, IMargin margin, IGridState state, Structs.Size canvasSize, out SizeF strX, out SizeF strY, out double stepDataY)
{
// For bottom offset get X string height for 0 value
var strValueX = state.ItemFormatter.ToString(Axis.X, new DataItem(0, 0), this.scaleService.ScaleToDataX(state.MinGridLineDistance));
strX = drawing.MeasureText(strValueX);
strY = new SizeF();
// For left offset find max Y string width
stepDataY = 0;
if (this.scaleService.State.Y1 <= 0 && this.scaleService.State.Y2 > 0)
{
DrawHorizontalLines(state, drawing, canvasSize, margin, ref strY, ref stepDataY, true, false, true);
DrawHorizontalLines(state, drawing, canvasSize, margin, ref strY, ref stepDataY, true, true, true);
}
else if (this.scaleService.State.Y1 != this.scaleService.State.Y2)
{
DrawHorizontalLines(state, drawing, canvasSize, margin, ref strY, ref stepDataY, false, false, true);
}
}