Working with Hatch Patterns in PS file | Java

Add Hatch Pattern in PS Document

Hatch pattern is a texture tiling pattern usually represented by small 2-colors (usually black&white) simple image. The main content of these small images is various hatches.

The Java platform doesn’t have a separate class for painting shapes and text with hatches. However, Aspose.Page for Java library offers com.aspose.eps.HatchPaintLibrary class that gives a possibilty to create java.awt.TexturePaint filled with hatches defined by one of 55 styles offered by com.aspose.eps.HatchStyle.

In order to paint graphics objects with a hatch pattern in Aspose.Page for Java library it is necessary to create hatch java.awt.TexturePaint with assigned hatch style, pass it into setPaint() or one of the fillText() or fillAndStrokeText() methods that accept java.awt.Paint as a parameter.
In order to outline graphics objects with a hatch pattern in Aspose.Page for Java library someone should set hatch pattern as current paint in PsDocument, create new java.awt.BasicStroke and pass it to setStroke() or one of the outlineText() or fillAndStrokeText() methods that accept java.awt.Stroke as a parameter.

In the example below we demonstrate, firstly, how to fill a shape with a hatch pattern, then all variety of hatch styles in Java, and, finally, how to fill and outline a text with a hatch pattern.

An algorithm for painting graphics objects with a hatch pattern in a new PS document includes the following steps:

1. Create an output stream for the resulting PS file.
2. Create PsSaveOptions.
3. Create PsDocument with the already created output stream and save options.
4. Create the shape or font in dependence on what object we are going to fill or outline.
5. Create with com.aspose.eps.HatchPaintLibrary an object of java.awt.TexturePaint with wishful style.
6. Set the hatch paint as current paint in PsDocument
7. Fill the shape with current paint or fill a text. If we use one of the methods for filling a text that accepts java.awt.Paint as a parameter, the previous point can be ignored.
8. Close the page.
9. Save the document.

If we need stroking (outlining) graphics objects with a hatch pattern instead of the last 4 points following will be:

     6. Set the hatch paint as a current paint in PsDocument.
     7. Create java.awt.BasicStroke object.
     8. Set this stroke as current stroke in PsDocument.
     9. Outline the shape with current paint and stroke or outline the text. If we use one of the methods for outlining the text that accepts java.awt.Stroke as a parameter, previous point can be ignored.
     10. Close the page.
     11. Save the document.

// The path to the documents directory.
String dataDir = Utils.getDataDir();

//Create output stream for PostScript document
FileOutputStream outPsStream = new FileOutputStream(dataDir + "AddHatchPattern_outPS.ps");
//Create save options with A4 size
PsSaveOptions options = new PsSaveOptions();

//Create new PS Document with the page opened
PsDocument document = new PsDocument(outPsStream, options, false);

int x0 = 20;
int y0 = 100;
int squareSide = 32;
int width = 500;
int sumX = 0;

//Restore graphics state
document.writeGraphicsSave();

//Translate to initial point
document.translate(x0, y0);

//Create a square for every pattern
Rectangle2D.Float square = new Rectangle2D.Float(0, 0, squareSide, squareSide);

//Create pen for outlining pattern square
BasicStroke stroke = new BasicStroke(2);

HatchStyle [] hatchStyles = HatchStyle.values();

//For every hatch pattern style 
for (int i = 0; i < hatchStyles.length; i++) {            
	//Create a hatch texture pattern by hatch style, foreground and background colors
	TexturePaint paint = HatchPaintLibrary.getHatchTexturePaint(hatchStyles[i], Color.BLACK, Color.WHITE);
	//Set paint with the current hatch pattern
    document.setPaint(paint);

    //Calculate a displacement in order to don't go beyond the page bounds
    int x = squareSide;
    int y = 0;
    if (sumX >= width) {
        x = -(sumX - squareSide);
        y += squareSide;
    }

    //Translate current graphics state
    document.translate(x, y);
    //Fill pattern square
    document.fill(square);

    //Set current paint
    document.setPaint(Color.BLACK);
    //Set current stroke
    document.setStroke(stroke);
    //Draw square outline
    document.draw(square);

    //Calculate distance from X0
    if (sumX >= width)
        sumX = squareSide;
    else
        sumX += x;
}

//Restore graphics state
document.writeGraphicsRestore();

//Fill a text with the hatch pattern
TexturePaint paint = HatchPaintLibrary.getHatchTexturePaint(HatchStyle.DiagonalCross, Color.RED, Color.YELLOW);
Font font = new Font("Arial", Font.BOLD, 96);
document.fillAndStrokeText("ABC", font, 200, 400, paint, Color.BLACK, stroke);

//Outline the text with the hatch pattern
paint = HatchPaintLibrary.getHatchTexturePaint(HatchStyle.Percent70, Color.BLUE, Color.WHITE);
document.outlineText("ABC", font, 200, 600, paint, new BasicStroke(5));

//Close current page
document.closePage();
//Save the document
document.save();

See working with a hatch pattern in PS document in .NET and C++.

The result of running this code is appeared as

You can download examples and data files from GitHub.