/// <summary>
/// Checks whether a color mode and a color match.
/// </summary>
public static XColor EnsureColorMode(PDFColorMode colorMode, XColor color) =>
#if true
colorMode == PDFColorMode.Rgb && color.ColorSpace != XColorSpace.Rgb
? XColor.FromArgb((int)(color.A * 255), color.R, color.G, color.B)
: colorMode == PDFColorMode.Cmyk && color.ColorSpace != XColorSpace.Cmyk
? XColor.FromCmyk(color.A, color.C, color.M, color.Y, color.K)
: color;
public static string InappropriateColorSpace(PDFColorMode colorMode, XColorSpace colorSpace)
{
string mode;
switch (colorMode)
{
case PDFColorMode.Rgb:
mode = "RGB";
break;
case PDFColorMode.Cmyk:
mode = "CMYK";
break;
default:
mode = "(undefined)";
break;
}
string space;
switch (colorSpace)
{
case XColorSpace.Rgb:
space = "RGB";
break;
case XColorSpace.Cmyk:
space = "CMYK";
break;
case XColorSpace.GrayScale:
space = "grayscale";
break;
default:
space = "(undefined)";
break;
}
return(String.Format("The document requires color mode {0}, but a color is defined using {1}. " +
"Use only colors that match the color mode of the PDF document", mode, space));
}
/// <summary>
/// Converts an XColor into a string with up to 3 decimal digits and a decimal point.
/// </summary>
public static string ToString(XColor color, PDFColorMode colorMode)
{
const string format = Config.SignificantFigures3;
// If not defined let color decide
if (colorMode == PDFColorMode.Undefined)
{
colorMode = color.ColorSpace == XColorSpace.Cmyk ? PDFColorMode.Cmyk : PDFColorMode.Rgb;
}
switch (colorMode)
{
case PDFColorMode.Cmyk:
return(String.Format(CultureInfo.InvariantCulture, "{0:" + format + "} {1:" + format + "} {2:" + format + "} {3:" + format + "}",
color.C, color.M, color.Y, color.K));
default:
return(String.Format(CultureInfo.InvariantCulture, "{0:" + format + "} {1:" + format + "} {2:" + format + "}",
color.R / 255.0, color.G / 255.0, color.B / 255.0));
}
}
/// <summary>
/// Setups the shading from the specified brush.
/// </summary>
internal void SetupFromBrush(XLinearGradientBrush brush, XGraphicsPDFRenderer renderer)
{
if (brush == null)
{
throw new ArgumentNullException("brush");
}
PDFColorMode colorMode = _document.Options.ColorMode;
XColor color1 = ColorSpaceHelper.EnsureColorMode(colorMode, brush._color1);
XColor color2 = ColorSpaceHelper.EnsureColorMode(colorMode, brush._color2);
PDFDictionary function = new PDFDictionary();
Elements[Keys.ShadingType] = new PDFInteger(2);
Elements[Keys.ColorSpace] = colorMode != PDFColorMode.Cmyk ? new PDFName("/DeviceRGB") : new PDFName("/DeviceCMYK");
double x1 = 0, y1 = 0, x2 = 0, y2 = 0;
if (brush._useRect)
{
XPoint pt1 = renderer.WorldToView(brush._rect.TopLeft);
XPoint pt2 = renderer.WorldToView(brush._rect.BottomRight);
switch (brush._linearGradientMode)
{
case XLinearGradientMode.Horizontal:
x1 = pt1.X;
y1 = pt1.Y;
x2 = pt2.X;
y2 = pt1.Y;
break;
case XLinearGradientMode.Vertical:
x1 = pt1.X;
y1 = pt1.Y;
x2 = pt1.X;
y2 = pt2.Y;
break;
case XLinearGradientMode.ForwardDiagonal:
x1 = pt1.X;
y1 = pt1.Y;
x2 = pt2.X;
y2 = pt2.Y;
break;
case XLinearGradientMode.BackwardDiagonal:
x1 = pt2.X;
y1 = pt1.Y;
x2 = pt1.X;
y2 = pt2.Y;
break;
}
}
else
{
XPoint pt1 = renderer.WorldToView(brush._point1);
XPoint pt2 = renderer.WorldToView(brush._point2);
x1 = pt1.X;
y1 = pt1.Y;
x2 = pt2.X;
y2 = pt2.Y;
}
const string format = Config.SignificantFigures3;
Elements[Keys.Coords] = new PDFLiteral("[{0:" + format + "} {1:" + format + "} {2:" + format + "} {3:" + format + "}]", x1, y1, x2, y2);
//Elements[Keys.Background] = new PDFRawItem("[0 1 1]");
//Elements[Keys.Domain] =
Elements[Keys.Function] = function;
//Elements[Keys.Extend] = new PDFRawItem("[true true]");
string clr1 = "[" + PDFEncoders.ToString(color1, colorMode) + "]";
string clr2 = "[" + PDFEncoders.ToString(color2, colorMode) + "]";
function.Elements["/FunctionType"] = new PDFInteger(2);
function.Elements["/C0"] = new PDFLiteral(clr1);
function.Elements["/C1"] = new PDFLiteral(clr2);
function.Elements["/Domain"] = new PDFLiteral("[0 1]");
function.Elements["/N"] = new PDFInteger(1);
}
