private void FunctionPrinter_Paint(object sender, PaintEventArgs e)
{
if (Function == null)
{
return;
}
var g = new ClientSpaceGraphics(e.Graphics, UserRange, ClientSize);
// Draw axes
using (var penOverride = new ClientSpaceGraphics.PenOverride(g, new Pen(Brushes.DeepSkyBlue)))
{
// X
{
var pi = (float)Math.PI;
g.PrintText(-pi, 0, "-pi ", SystemFonts.DefaultFont);
g.PrintText(-pi / 2, 0, "-pi/2", SystemFonts.DefaultFont);
g.PrintText(pi / 2, 0, "pi/2", SystemFonts.DefaultFont);
g.PrintText(pi, 0, "pi ", SystemFonts.DefaultFont);
g.DrawLine(UserRange.Left, 0.0f, UserRange.Right, 0.0f);
}
// Y
{
float dy = 0.5f;
float y = ((int)UserRange.Y) - 1;
while (y < UserRange.Y + UserRange.Height)
{
g.PrintText(0, y, y.ToString(), SystemFonts.DefaultFont);
y += dy;
}
g.DrawLine(0, UserRange.Bottom, 0.0f, UserRange.Top);
}
}
// Draw function curve
using (var penOverride = new ClientSpaceGraphics.PenOverride(g, new Pen(Color.FromArgb(127, Color.Black))))
{
var cachedArgsArray = new object[1];
float dx = 1.0f / SegmentsCount;
g.DrawFunctionLine(dx, x => Function(x));
}
}
public PenOverride(ClientSpaceGraphics g, Pen pen)
{
Graphics = g;
PrevPen = g.Pen;
g.Pen = pen;
}
