protected void UpdateBitmap()
{
if (m_Bitmap == null)
{
return;
}
using (Graphics G = Graphics.FromImage(m_Bitmap)) {
G.FillRectangle(Brushes.White, 0, 0, Width, Height);
G.DrawLine(Pens.Black, 10, 0, 10, Height);
G.DrawLine(Pens.Black, 0, Height - 10, Width, Height - 10);
FresnelEval Eval = null;
switch (m_Type)
{
case FRESNEL_TYPE.SCHLICK: Eval = Fresnel_Schlick; break;
case FRESNEL_TYPE.PRECISE: Eval = Fresnel_Precise; break;
case FRESNEL_TYPE.TABLE: Eval = Fresnel_Table; break;
}
DrawLine(G, 0, 1, 1, 1, Pens.Gray);
float x = 0.0f;
float yr, yg, yb, yy;
if (!m_PlotAgainstF0)
{
// Plot against IOR
Eval(MIN_IOR, out yr, out yg, out yb, out yy);
for (int X = 10; X <= Width; X++)
{
float px = x;
float pyr = yr;
float pyg = yg;
float pyb = yb;
float pyy = yy;
x = (float)(X - 10.0f) / (Width - 10);
float CurrentIOR = MIN_IOR + x * (m_MaxIOR - MIN_IOR);
Eval(CurrentIOR, out yr, out yg, out yb, out yy);
Clamp(ref yr);
Clamp(ref yg);
Clamp(ref yb);
Clamp(ref yy);
DrawLine(G, px, pyr, x, yr, Pens.Red);
DrawLine(G, px, pyg, x, yg, Pens.LimeGreen);
DrawLine(G, px, pyb, x, yb, Pens.Blue);
DrawLine(G, px, pyy, x, yy, Pens.Gold);
}
// Show current IOR
float x_IOR = (IOR - MIN_IOR) / (m_MaxIOR - MIN_IOR);
DrawLine(G, x_IOR, 0.0f, x_IOR, 1.0f, Pens.Black);
}
else
{
// plot against F0
Eval(Form1.F0_to_IOR(0.0f), out yr, out yg, out yb, out yy);
for (int X = 10; X <= Width; X++)
{
float px = x;
float pyr = yr;
float pyg = yg;
float pyb = yb;
float pyy = yy;
x = (float)(X - 10.0f) / (Width - 10);
float CurrentIOR = Form1.F0_to_IOR(x);
Eval(CurrentIOR, out yr, out yg, out yb, out yy);
Clamp(ref yr);
Clamp(ref yg);
Clamp(ref yb);
Clamp(ref yy);
DrawLine(G, px, pyr, x, yr, Pens.Red);
DrawLine(G, px, pyg, x, yg, Pens.LimeGreen);
DrawLine(G, px, pyb, x, yb, Pens.Blue);
DrawLine(G, px, pyy, x, yy, Pens.Gold);
}
// Show current IOR
float x_IOR = Form1.IOR_to_F0(IOR);
DrawLine(G, x_IOR, 0.0f, x_IOR, 1.0f, Pens.Black);
}
// Draw values at current IOR
Eval(m_IOR, out yr, out yg, out yb, out yy);
string T = "R = " + yr.ToString("G4") + "\r\nG = " + yg.ToString("G4") + "\r\nB = " + yb.ToString("G4") + "\r\nA = " + yy.ToString("G4");
SizeF TextSize = G.MeasureString(T, Font);
G.DrawString(T, Font, Brushes.Black, Width - TextSize.Width - 12.0f, Height - TextSize.Height - 20);
}
Invalidate();
}
protected void UpdateBitmap()
{
if (m_Bitmap == null)
{
return;
}
using (Graphics G = Graphics.FromImage(m_Bitmap))
{
G.FillRectangle(Brushes.White, 0, 0, Width, Height);
G.DrawLine(Pens.Black, 10, 0, 10, Height);
G.DrawLine(Pens.Black, 0, Height - 10, Width, Height - 10);
FresnelEval Eval = null;
if (m_FromData)
{
switch (m_Type)
{
case FRESNEL_TYPE.SCHLICK: Eval = Fresnel_SchlickData; PrepareData(); break;
case FRESNEL_TYPE.PRECISE: Eval = Fresnel_PreciseData; PrepareData(); break;
}
}
else
{
switch (m_Type)
{
case FRESNEL_TYPE.SCHLICK: Eval = Fresnel_Schlick; PrepareSchlick(); break;
case FRESNEL_TYPE.PRECISE: Eval = Fresnel_Precise; PreparePrecise(); break;
}
}
DrawLine(G, 0, 1, 1, 1, Pens.Gray);
float x = 0.0f;
float yr, yg, yb;
Eval(1.0f, out yr, out yg, out yb);
for (int X = 10; X <= Width; X++)
{
float px = x;
float pyr = yr;
float pyg = yg;
float pyb = yb;
x = (float)(X - 10.0f) / (Width - 10);
float CosTheta = (float)Math.Cos(x * 0.5 * Math.PI); // Cos(theta)
Eval(CosTheta, out yr, out yg, out yb);
DrawLine(G, px, pyr, x, yr, Pens.Red);
DrawLine(G, px, pyg, x, yg, Pens.LimeGreen);
DrawLine(G, px, pyb, x, yb, Pens.Blue);
}
if (!m_FromData)
{
Eval(1.0f, out yr, out yg, out yb);
float F0 = Math.Max(Math.Max(yr, yg), yb);
G.DrawString("F0 = " + F0, Font, Brushes.Black, 12.0f, Height - 30 - (Height - 20) * F0);
}
else
{
Eval(1.0f, out yr, out yg, out yb);
float F0 = Math.Max(Math.Max(yr, yg), yb);
float Offset = Height - 30 - 24 - (Height - 20) * F0;
if (Offset < 40)
{
Offset = Height - (Height - 20) * Math.Min(Math.Min(yr, yg), yb);
}
G.DrawString("R (n = " + m_IndicesR.n + " k = " + m_IndicesR.k + ") F0 = " + yr, Font, Brushes.Black, 12.0f, Offset);
G.DrawString("G (n = " + m_IndicesG.n + " k = " + m_IndicesG.k + ") F0 = " + yg, Font, Brushes.Black, 12.0f, Offset + 12);
G.DrawString("B (n = " + m_IndicesB.n + " k = " + m_IndicesB.k + ") F0 = " + yb, Font, Brushes.Black, 12.0f, Offset + 24);
}
}
Invalidate();
}
