private static void PlotAxes(BoundsF bounds, double scale, Bitmap bmp)
{
double unitsX = UnitSize(bounds.Bounds.Width);
double unitsY = UnitSize(bounds.Bounds.Height);
using Graphics g = Graphics.FromImage(bmp);
for (double v = RoundUp(bounds.Bounds.X, unitsX); v < bounds.Bounds.Right; v += unitsX)
{
List <PointF> rule = new List <PointF>
{
new PointF {
X = (float)v, Y = bounds.Bounds.Y
},
new PointF {
X = (float)v, Y = bounds.Bounds.Bottom
}
};
PlotGraph(rule, g, bounds.Bounds, scale, Color.Gray);
LabelXRule(v, g, bounds, scale);
}
for (double v = RoundUp(bounds.Bounds.Y, unitsY); v < bounds.Bounds.Bottom; v += unitsY)
{
List <PointF> rule = new List <PointF>
{
new PointF {
Y = (float)v, X = bounds.Bounds.X
},
new PointF {
Y = (float)v, X = bounds.Bounds.Right
}
};
PlotGraph(rule, g, bounds.Bounds, scale, Color.Gray);
LabelYRule(v, g, bounds, scale);
}
}
public static Image PlotGraphs(IEnumerable <IEnumerable <PointF> > points, int width, int height, Color?color = null)
{
Color[] colours = { Color.Black, Color.Brown, Color.Red, Color.DarkBlue,
Color.Green, Color.Blue, Color.Purple, Color.Gray };
if (color.HasValue)
{
colours = new Color[] { color.Value }
}
;
Bitmap bmp = new Bitmap(width, height);
BoundsF bounds = new BoundsF();
List <List <PointF> > plots = new List <List <PointF> >();
foreach (IEnumerable <PointF> pl in points)
{
plots.Add(bounds.Track(pl).ToList());
}
double scale = ScaleFactor(bounds.Bounds, width, height);
using Graphics g = Graphics.FromImage(bmp);
g.FillRectangle(Brushes.White, 0, 0, width, height);
g.CompositingQuality = CompositingQuality.HighQuality;
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.SmoothingMode = SmoothingMode.HighQuality;
PlotAxes(bounds, scale, bmp);
int index = 0;
foreach (List <PointF> pl in plots)
{
PlotGraph(pl, g, bounds.Bounds, scale, colours[index++ % colours.Length]);
}
return(bmp);
}
private static void LabelXRule(double v, Graphics g, BoundsF bounds, double scale)
{
// First generate label string
string label = v.ToString("G2");
Font font = new Font("Consolas", 30F);
SizeF txtSize = g.MeasureString(label, font);
// Find the line position
float x = (float)(0.5 + scale * (v - bounds.Bounds.X));
x -= txtSize.Width / 2;
g.FillRectangle(Brushes.White, x, 0, txtSize.Width, txtSize.Height);
g.DrawString(label, font, Brushes.Gray, x, 0);
}