如何使用 itext 7 设置自定义颜色

Question

I cannot find a solution for a very simple question, how can I set a custom color for a text/line/etc. using iText7 in java code?

I found this reply for iText5 but in version 7 there is no BaseColor class...

Answer 1

I use this code to customize the text color:

com.itextpdf.kernel.color.Color myColor = new DeviceRgb(255, 100, 20);
Paragraph colorPara = new Paragraph("text with color").setFontColor(myColor);

Answer 2

One option is to use the ColorConstants . It is located in the kernel dependency.

PdfCanvas canvas = new PdfCanvas(pdfPage);
canvas.setColor(ColorConstants.DARK_GRAY, true);

Answer 3

I found the following solution after some try-and-fail loop:

        float[] col = new float[]{0,0.5f,0};
        Color szin = Color.makeColor(Color.GREEN.getColorSpace(), col);
        Canvas canvas = new Canvas(pdfCanvas, pdfDoc, page.getPageSize());
        canvas.setProperty(Property.FONT_COLOR, szin);

At first, I had no idea about how can I get/set that color space, what was required as first parameter of the makeColor method. After logging out the following

LOGGER.info(Color.GREEN.getColorSpace().getPdfObject());

I saw, it is an RGB related info, so maybe I should specify the second float[] with 3 elements (not 4, like cmyk).

Info: 2464035 [http-listener-1(3)] INFO fornax.hu.pdf.generate.PdfCreator2 - /DeviceRGB

The other big problem was, how should I set the float values. Logical tip was for a dark green is 62,172,62, but I saw nothing. I had to realize, 0 acting as 0, but any number greater than 1 act as 255 in the result color, so tried to set values between 0 and 1, and I got the JACKPOT!

test color 1 with {1,0.5f,0} test color 2 with {0,0.5f,0}

Special thanks for iText7 documentation writers, who were unable to insert any example for this very very basic stuff for noobs like me.

Answer 4

Cell hcell = new Cell();   
Paragraph paragraph = new Paragraph("Your Text").setTextAlignment(TextAlignment.CENTER).setFontSize(8);
hcell.add(paragraph);
Color color = WebColors.getRGBColor("red"); // Color name to RGB
hcell.setBackgroundColor(color);