Examples with PDFormContentStream org.apache.pdfbox.pdmodel.PDFormContentStream used on opensource projects

Example 1 with PDFormContentStream

use of org.apache.pdfbox.pdmodel.PDFormContentStream in project pdfbox by apache.

the class PDHighlightAppearanceHandler method generateNormalAppearance.

@Override
public void generateNormalAppearance() {
    PDAnnotationHighlight annotation = (PDAnnotationHighlight) getAnnotation();
    PDRectangle rect = annotation.getRectangle();
    float[] pathsArray = annotation.getQuadPoints();
    if (pathsArray == null) {
        return;
    }
    AnnotationBorder ab = AnnotationBorder.getAnnotationBorder(annotation, annotation.getBorderStyle());
    PDColor color = annotation.getColor();
    if (color == null || color.getComponents().length == 0) {
        return;
    }
    // Adjust rectangle even if not empty, see PLPDF.com-MarkupAnnotations.pdf
    // TODO in a class structure this should be overridable
    // this is similar to polyline but different data type
    // TODO padding should consider the curves too; needs to know in advance where the curve is
    float minX = Float.MAX_VALUE;
    float minY = Float.MAX_VALUE;
    float maxX = Float.MIN_VALUE;
    float maxY = Float.MIN_VALUE;
    for (int i = 0; i < pathsArray.length / 2; ++i) {
        float x = pathsArray[i * 2];
        float y = pathsArray[i * 2 + 1];
        minX = Math.min(minX, x);
        minY = Math.min(minY, y);
        maxX = Math.max(maxX, x);
        maxY = Math.max(maxY, y);
    }
    // get the delta used for curves and use it for padding
    float maxDelta = 0;
    for (int i = 0; i < pathsArray.length / 8; ++i) {
        // one of the two is 0, depending whether the rectangle is
        // horizontal or vertical
        // if it is diagonal then... uh...
        float delta = Math.max((pathsArray[i + 0] - pathsArray[i + 4]) / 4, (pathsArray[i + 1] - pathsArray[i + 5]) / 4);
        maxDelta = Math.max(delta, maxDelta);
    }
    rect.setLowerLeftX(Math.min(minX - ab.width / 2 - maxDelta, rect.getLowerLeftX()));
    rect.setLowerLeftY(Math.min(minY - ab.width / 2 - maxDelta, rect.getLowerLeftY()));
    rect.setUpperRightX(Math.max(maxX + ab.width + maxDelta, rect.getUpperRightX()));
    rect.setUpperRightY(Math.max(maxY + ab.width + maxDelta, rect.getUpperRightY()));
    annotation.setRectangle(rect);
    try {
        try (PDAppearanceContentStream cs = getNormalAppearanceAsContentStream()) {
            prepareResources();
            PDExtendedGraphicsState r0 = new PDExtendedGraphicsState();
            PDExtendedGraphicsState r1 = new PDExtendedGraphicsState();
            r0.setAlphaSourceFlag(false);
            r0.setStrokingAlphaConstant(annotation.getConstantOpacity());
            r0.setNonStrokingAlphaConstant(annotation.getConstantOpacity());
            r1.setAlphaSourceFlag(false);
            r1.setBlendMode(BlendMode.MULTIPLY);
            cs.setGraphicsStateParameters(r0);
            cs.setGraphicsStateParameters(r1);
            // TODO replace with document.getDocument().createCOSStream()
            // or call new PDFormXObject(document)
            PDFormXObject frm1 = new PDFormXObject(new COSStream());
            PDFormXObject frm2 = new PDFormXObject(new COSStream());
            frm1.setResources(new PDResources());
            try (PDFormContentStream mwfofrmCS = new PDFormContentStream(frm1)) {
                mwfofrmCS.drawForm(frm2);
            }
            frm1.setBBox(annotation.getRectangle());
            COSDictionary groupDict = new COSDictionary();
            groupDict.setItem(COSName.S, COSName.TRANSPARENCY);
            // TODO PDFormXObject.setGroup() is missing
            frm1.getCOSObject().setItem(COSName.GROUP, groupDict);
            cs.drawForm(frm1);
            frm2.setBBox(annotation.getRectangle());
            try (PDFormContentStream frm2CS = new PDFormContentStream(frm2)) {
                frm2CS.setNonStrokingColor(color);
                int of = 0;
                while (of + 7 < pathsArray.length) {
                    // quadpoints spec sequence is incorrect, correct one is (4,5 0,1 2,3 6,7)
                    // https://stackoverflow.com/questions/9855814/pdf-spec-vs-acrobat-creation-quadpoints
                    // for "curvy" highlighting, two Bézier control points are used that seem to have a
                    // distance of about 1/4 of the height.
                    // note that curves won't appear if outside of the rectangle
                    float delta = 0;
                    if (Float.compare(pathsArray[of + 0], pathsArray[of + 4]) == 0 && Float.compare(pathsArray[of + 1], pathsArray[of + 3]) == 0 && Float.compare(pathsArray[of + 2], pathsArray[of + 6]) == 0 && Float.compare(pathsArray[of + 5], pathsArray[of + 7]) == 0) {
                        // horizontal highlight
                        delta = (pathsArray[of + 1] - pathsArray[of + 5]) / 4;
                    } else if (Float.compare(pathsArray[of + 1], pathsArray[of + 5]) == 0 && Float.compare(pathsArray[of + 0], pathsArray[of + 2]) == 0 && Float.compare(pathsArray[of + 3], pathsArray[of + 7]) == 0 && Float.compare(pathsArray[of + 4], pathsArray[of + 6]) == 0) {
                        // vertical highlight
                        delta = (pathsArray[of + 0] - pathsArray[of + 4]) / 4;
                    }
                    frm2CS.moveTo(pathsArray[of + 4], pathsArray[of + 5]);
                    if (Float.compare(pathsArray[of + 0], pathsArray[of + 4]) == 0) {
                        // horizontal highlight
                        frm2CS.curveTo(pathsArray[of + 4] - delta, pathsArray[of + 5] + delta, pathsArray[of + 0] - delta, pathsArray[of + 1] - delta, pathsArray[of + 0], pathsArray[of + 1]);
                    } else if (Float.compare(pathsArray[of + 5], pathsArray[of + 1]) == 0) {
                        // vertical highlight
                        frm2CS.curveTo(pathsArray[of + 4] + delta, pathsArray[of + 5] + delta, pathsArray[of + 0] - delta, pathsArray[of + 1] + delta, pathsArray[of + 0], pathsArray[of + 1]);
                    } else {
                        frm2CS.lineTo(pathsArray[of + 0], pathsArray[of + 1]);
                    }
                    frm2CS.lineTo(pathsArray[of + 2], pathsArray[of + 3]);
                    if (Float.compare(pathsArray[of + 2], pathsArray[of + 6]) == 0) {
                        // horizontal highlight
                        frm2CS.curveTo(pathsArray[of + 2] + delta, pathsArray[of + 3] - delta, pathsArray[of + 6] + delta, pathsArray[of + 7] + delta, pathsArray[of + 6], pathsArray[of + 7]);
                    } else if (Float.compare(pathsArray[of + 3], pathsArray[of + 7]) == 0) {
                        // vertical highlight
                        frm2CS.curveTo(pathsArray[of + 2] - delta, pathsArray[of + 3] - delta, pathsArray[of + 6] + delta, pathsArray[of + 7] - delta, pathsArray[of + 6], pathsArray[of + 7]);
                    } else {
                        frm2CS.lineTo(pathsArray[of + 6], pathsArray[of + 7]);
                    }
                    frm2CS.fill();
                    of += 8;
                }
            }
        }
    } catch (IOException ex) {
        LOG.error(ex);
    }
}