public virtual void BeforeRender()
{
if (!this.lerpCacheIsValid)
{
byte startAlpha;
byte endAlpha;
if (this.alphaOnly)
{
ComputeAlphaOnlyValuesFromColors(this.startColor, this.endColor, out startAlpha, out endAlpha);
}
else
{
startAlpha = this.startColor.A;
endAlpha = this.endColor.A;
}
this.lerpAlphas = new byte[256];
this.lerpColors = new ColorBgra[256];
for (int i = 0; i < 256; ++i)
{
byte a = (byte)i;
this.lerpColors[a] = ColorBgra.Blend(this.startColor, this.endColor, a);
this.lerpAlphas[a] = (byte)(startAlpha + ((endAlpha - startAlpha) * a) / 255);
}
this.lerpCacheIsValid = true;
}
}
private void DrawToGraphics(Graphics g)
{
ColorBgra colorSolid = ColorBgra.FromColor(this.ForeColor);
ColorBgra colorGuide = ColorBgra.FromColor(this.ForeColor);
ColorBgra colorGrid = ColorBgra.FromColor(this.ForeColor);
colorGrid.A = 128;
colorGuide.A = 96;
Pen penSolid = new Pen(colorSolid.ToColor(), 1);
Pen penGrid = new Pen(colorGrid.ToColor(), 1);
Pen penGuide = new Pen(colorGuide.ToColor(), 1);
penGrid.DashStyle = DashStyle.Dash;
g.Clear(this.BackColor);
g.SmoothingMode = SmoothingMode.AntiAlias;
Rectangle ourRect = ClientRectangle;
ourRect.Inflate(-1, -1);
if (lastMouseXY.Y >= 0)
{
g.DrawLine(penGuide, 0, lastMouseXY.Y, Width, lastMouseXY.Y);
}
if (lastMouseXY.X >= 0)
{
g.DrawLine(penGuide, lastMouseXY.X, 0, lastMouseXY.X, Height);
}
for (float f = 0.25f; f <= 0.75f; f += 0.25f)
{
float x = Utility.Lerp(ourRect.Left, ourRect.Right, f);
float y = Utility.Lerp(ourRect.Top, ourRect.Bottom, f);
g.DrawLine(penGrid,
Point.Round(new PointF(x, ourRect.Top)),
Point.Round(new PointF(x, ourRect.Bottom)));
g.DrawLine(penGrid,
Point.Round(new PointF(ourRect.Left, y)),
Point.Round(new PointF(ourRect.Right, y)));
}
g.DrawLine(penGrid, ourRect.Left, ourRect.Bottom, ourRect.Right, ourRect.Top);
float width = this.ClientRectangle.Width;
float height = this.ClientRectangle.Height;
for (int c = 0; c < channels; ++c)
{
SortedList <int, int> channelControlPoints = controlPoints[c];
int points = channelControlPoints.Count;
ColorBgra color = GetVisualColor(c);
ColorBgra colorSelected = ColorBgra.Blend(color, ColorBgra.White, 128);
const float penWidthNonSelected = 1;
const float penWidthSelected = 2;
float penWidth = mask[c] ? penWidthSelected : penWidthNonSelected;
Pen penSelected = new Pen(color.ToColor(), penWidth);
color.A = 128;
Pen pen = new Pen(color.ToColor(), penWidth);
Brush brush = new SolidBrush(color.ToColor());
SolidBrush brushSelected = new SolidBrush(Color.White);
SplineInterpolator interpolator = new SplineInterpolator();
IList <int> xa = channelControlPoints.Keys;
IList <int> ya = channelControlPoints.Values;
PointF[] line = new PointF[Entries];
for (int i = 0; i < points; ++i)
{
interpolator.Add(xa[i], ya[i]);
}
for (int i = 0; i < line.Length; ++i)
{
line[i].X = (float)i * (width - 1) / (entries - 1);
line[i].Y = (float)(Utility.Clamp(entries - 1 - interpolator.Interpolate(i), 0, entries - 1)) *
(height - 1) / (entries - 1);
}
pen.LineJoin = LineJoin.Round;
g.DrawLines(pen, line);
for (int i = 0; i < points; ++i)
{
int k = channelControlPoints.Keys[i];
float x = k * (width - 1) / (entries - 1);
float y = (entries - 1 - channelControlPoints.Values[i]) * (height - 1) / (entries - 1);
const float radiusSelected = 4;
const float radiusNotSelected = 3;
const float radiusUnMasked = 2;
bool selected = (mask[c] && pointsNearMousePerChannel[c] == i);
float size = selected ? radiusSelected : (mask[c] ? radiusNotSelected : radiusUnMasked);
RectangleF rect = Utility.RectangleFromCenter(new PointF(x, y), size);
g.FillEllipse(selected ? brushSelected : brush, rect.X, rect.Y, rect.Width, rect.Height);
g.DrawEllipse(selected ? penSelected : pen, rect.X, rect.Y, rect.Width, rect.Height);
}
pen.Dispose();
}
penSolid.Dispose();
penGrid.Dispose();
penGuide.Dispose();
}