pdfgraphics2d.java

iText是一个能够快速产生PDF文件的java类库。iText的java类对于那些要产生包含文本

        double dwidth = (double)dx2-dx1;
        double dheight = (double)dy2-dy1;
        double swidth = (double)sx2-sx1;
        double sheight = (double)sy2-sy1;
        
        //if either width or height is 0, then there is nothing to draw
        if (dwidth == 0 || dheight == 0 || swidth == 0 || sheight == 0) return true;
        
        double scalex = dwidth/swidth;
        double scaley = dheight/sheight;
        
        double transx = sx1*scalex;
        double transy = sy1*scaley;
        AffineTransform tx = AffineTransform.getTranslateInstance(dx1-transx,dy1-transy);
        tx.scale(scalex,scaley);
        
        BufferedImage mask = new BufferedImage(img.getWidth(observer), img.getHeight(observer), BufferedImage.TYPE_BYTE_BINARY);
        Graphics g = mask.getGraphics();
        g.fillRect(sx1,sy1, (int)swidth, (int)sheight);
        drawImage(img, mask, tx, null, observer);
        g.dispose();
        return true;
    }
    
    /**
     * @see Graphics#dispose()
     */
    public void dispose() {
        if (kid)
            return;
        if (!disposeCalled) {
            disposeCalled = true;
            cb.restoreState();
            cb.restoreState();
            dg2.dispose();
            dg2 = null;
            if (kids != null) {
                ByteBuffer buf = new ByteBuffer();
                internalDispose(buf);
                ByteBuffer buf2 = cb.getInternalBuffer();
                buf2.reset();
                buf2.append(buf);
            }
        }
    }
    
    private void internalDispose(ByteBuffer buf) {
        int last = 0;
        int pos = 0;
        ByteBuffer buf2 = cb.getInternalBuffer();
        if (kids != null) {
            for (int k = 0; k < kids.size(); k += 2) {
                pos = ((Integer)kids.get(k)).intValue();
                PdfGraphics2D g2 = (PdfGraphics2D)kids.get(k + 1);
                g2.cb.restoreState();
                g2.cb.restoreState();
                buf.append(buf2.getBuffer(), last, pos - last);
                g2.dg2.dispose();
                g2.dg2 = null;
                g2.internalDispose(buf);
                last = pos;
            }
        }
        buf.append(buf2.getBuffer(), last, buf2.size() - last);
    }
    
    ///////////////////////////////////////////////
    //
    //
    //		implementation specific methods
    //
    //
    
    
    private void followPath(Shape s, int drawType) {
        if (s==null) return;
        if (drawType==STROKE) {
            if (!(stroke instanceof BasicStroke)) {
                s = stroke.createStrokedShape(s);
                followPath(s, FILL);
                return;
            }
        }
        if (drawType==STROKE) {
            setStrokeDiff(stroke, oldStroke);
            oldStroke = stroke;
            setStrokePaint();
        }
        else if (drawType==FILL)
            setFillPaint();
        PathIterator points;
        int traces = 0;
        if (drawType == CLIP)
            points = s.getPathIterator(IDENTITY);
        else
            points = s.getPathIterator(transform);
        float[] coords = new float[6];
        while(!points.isDone()) {
            ++traces;
            int segtype = points.currentSegment(coords);
            normalizeY(coords);
            switch(segtype) {
                case PathIterator.SEG_CLOSE:
                    cb.closePath();
                    break;

                case PathIterator.SEG_CUBICTO:
                    cb.curveTo(coords[0], coords[1], coords[2], coords[3], coords[4], coords[5]);
                    break;

                case PathIterator.SEG_LINETO:
                    cb.lineTo(coords[0], coords[1]);
                    break;

                case PathIterator.SEG_MOVETO:
                    cb.moveTo(coords[0], coords[1]);
                    break;

                case PathIterator.SEG_QUADTO:
                    cb.curveTo(coords[0], coords[1], coords[2], coords[3]);
                    break;
            }
            points.next();
        }
        switch (drawType) {
        case FILL:
            if (traces > 0) {
                if (points.getWindingRule() == PathIterator.WIND_EVEN_ODD)
                    cb.eoFill();
                else
                    cb.fill();
            }
            break;
        case STROKE:
            if (traces > 0)
                cb.stroke();
            break;
        default: //drawType==CLIP
            if (traces == 0)
                cb.rectangle(0, 0, 0, 0);
            if (points.getWindingRule() == PathIterator.WIND_EVEN_ODD)
                cb.eoClip();
            else
                cb.clip();
            cb.newPath();
        }
    }
    
    private float normalizeY(float y) {
        return this.height - y;
    }
    
    private void normalizeY(float[] coords) {
        coords[1] = normalizeY(coords[1]);
        coords[3] = normalizeY(coords[3]);
        coords[5] = normalizeY(coords[5]);
    }
    
    private AffineTransform normalizeMatrix() {
        double[] mx = new double[6];
        AffineTransform result = AffineTransform.getTranslateInstance(0,0);
        result.getMatrix(mx);
        mx[3]=-1;
        mx[5]=height;
        result = new AffineTransform(mx);
        result.concatenate(transform);
        return result;
    }
    
    private boolean drawImage(Image img, Image mask, AffineTransform xform, Color bgColor, ImageObserver obs) {
        if (xform==null) return true;
        
        xform.translate(0, img.getHeight(obs));
        xform.scale(img.getWidth(obs), img.getHeight(obs));
        
        AffineTransform inverse = this.normalizeMatrix();
        AffineTransform flipper = AffineTransform.getScaleInstance(1,-1);
        inverse.concatenate(xform);
        inverse.concatenate(flipper);
        
        double[] mx = new double[6];
        inverse.getMatrix(mx);
        if (currentFillGState != 255) {
            PdfGState gs = fillGState[255];
            if (gs == null) {
                gs = new PdfGState();
                gs.setFillOpacity(1);
                fillGState[255] = gs;
            }
            cb.setGState(gs);
        }
        
        try {
            com.lowagie.text.Image image = null;
            if(!convertImagesToJPEG){
                image = com.lowagie.text.Image.getInstance(img, bgColor);
            }
            else{
                BufferedImage scaled = new BufferedImage(img.getWidth(null), img.getHeight(null), BufferedImage.TYPE_INT_RGB);
                Graphics2D g3 = scaled.createGraphics();
                g3.drawImage(img, 0, 0, img.getWidth(null), img.getHeight(null), null);
                g3.dispose();
                
                ByteArrayOutputStream baos = new ByteArrayOutputStream();
                com.sun.image.codec.jpeg.JPEGImageEncoder encoder = com.sun.image.codec.jpeg.JPEGCodec.createJPEGEncoder(baos);
                com.sun.image.codec.jpeg.JPEGEncodeParam param = com.sun.image.codec.jpeg.JPEGCodec.getDefaultJPEGEncodeParam(scaled);
                param.setQuality(jpegQuality, true);
                encoder.encode(scaled, param);
                scaled.flush();
                scaled = null;
                image = com.lowagie.text.Image.getInstance(baos.toByteArray());
                
            }
            if (mask!=null) {
                com.lowagie.text.Image msk = com.lowagie.text.Image.getInstance(mask, null, true);
                msk.makeMask();
                msk.setInverted(true);
                image.setImageMask(msk);
            }
            cb.addImage(image, (float)mx[0], (float)mx[1], (float)mx[2], (float)mx[3], (float)mx[4], (float)mx[5]);
        } catch (Exception ex) {
            throw new IllegalArgumentException();
        }
        if (currentFillGState != 255) {
            PdfGState gs = fillGState[currentFillGState];
            cb.setGState(gs);
        }        
        return true;
    }
    
    private boolean checkNewPaint(Paint oldPaint) {
        if (paint == oldPaint)
            return false;
        return !((paint instanceof Color) && paint.equals(oldPaint));
    }
    
    private void setFillPaint() {
        if (checkNewPaint(paintFill)) {
            paintFill = paint;
            setPaint(false, 0, 0, true);
        }
    }
    
    private void setStrokePaint() {
        if (checkNewPaint(paintStroke)) {
            paintStroke = paint;
            setPaint(false, 0, 0, false);
        }
    }
    
    private void setPaint(boolean invert, double xoffset, double yoffset, boolean fill) {
        if (paint instanceof Color) {
            Color color = (Color)paint;
            int alpha = color.getAlpha();
            if (fill) {
                if (alpha != currentFillGState) {
                    currentFillGState = alpha;
                    PdfGState gs = fillGState[alpha];
                    if (gs == null) {
                        gs = new PdfGState();
                        gs.setFillOpacity((float)alpha / 255f);
                        fillGState[alpha] = gs;
                    }
                    cb.setGState(gs);
                }
                cb.setColorFill(color);
            }
            else {
                if (alpha != currentStrokeGState) {
                    currentStrokeGState = alpha;
                    PdfGState gs = strokeGState[alpha];
                    if (gs == null) {
                        gs = new PdfGState();
                        gs.setStrokeOpacity((float)alpha / 255f);
                        strokeGState[alpha] = gs;
                    }
                    cb.setGState(gs);
                }
                cb.setColorStroke(color);
            }
        }
        else if (paint instanceof GradientPaint) {
            GradientPaint gp = (GradientPaint)paint;
            Point2D p1 = gp.getPoint1();
            transform.transform(p1, p1);
            Point2D p2 = gp.getPoint2();
            transform.transform(p2, p2);
            Color c1 = gp.getColor1();
            Color c2 = gp.getColor2();
            PdfShading shading = PdfShading.simpleAxial(cb.getPdfWriter(), (float)p1.getX(), normalizeY((float)p1.getY()), (float)p2.getX(), normalizeY((float)p2.getY()), c1, c2);
            PdfShadingPattern pat = new PdfShadingPattern(shading);
            if (fill)
                cb.setShadingFill(pat);
            else
                cb.setShadingStroke(pat);
        }
        else if (paint instanceof TexturePaint) {
            try {
                TexturePaint tp = (TexturePaint)paint;
                BufferedImage img = tp.getImage();
                Rectangle2D rect = tp.getAnchorRect();
                com.lowagie.text.Image image = com.lowagie.text.Image.getInstance(img, null);
                PdfPatternPainter pattern = cb.createPattern(image.getWidth(), image.getHeight());
                AffineTransform inverse = this.normalizeMatrix();
                inverse.translate(rect.getX(), rect.getY());
                inverse.scale(rect.getWidth() / image.getWidth(), -rect.getHeight() / image.getHeight());
                double[] mx = new double[6];
                inverse.getMatrix(mx);
                pattern.setPatternMatrix((float)mx[0], (float)mx[1], (float)mx[2], (float)mx[3], (float)mx[4], (float)mx[5]) ;
                image.setAbsolutePosition(0,0);
                pattern.addImage(image);
                if (fill)
                    cb.setPatternFill(pattern);
                else
                    cb.setPatternStroke(pattern);
            } catch (Exception ex) {
                if (fill)
                    cb.setColorFill(Color.gray);
                else
                    cb.setColorStroke(Color.gray);
            }
        }
        else {
            try {
                BufferedImage img = null;
                int type = BufferedImage.TYPE_4BYTE_ABGR;
                if (paint.getTransparency() == Transparency.OPAQUE) {
                    type = BufferedImage.TYPE_3BYTE_BGR;
                }
                img = new BufferedImage((int)width, (int)height, type);
                Graphics2D g = (Graphics2D)img.getGraphics();
                g.transform(transform);
                AffineTransform inv = transform.createInverse();
                Shape fillRect = new Rectangle2D.Double(0,0,img.getWidth(),img.getHeight());
                fillRect = inv.createTransformedShape(fillRect);
                g.setPaint(paint);
                g.fill(fillRect);
                if (invert) {
                    AffineTransform tx = new AffineTransform();
                    tx.scale(1,-1);
                    tx.translate(-xoffset,-yoffset);
                    g.drawImage(img,tx,null);
                }
                g.dispose();
                g = null;
                com.lowagie.text.Image image = com.lowagie.text.Image.getInstance(img, null);
                PdfPatternPainter pattern = cb.createPattern(width, height);
                image.setAbsolutePosition(0,0);
                pattern.addImage(image);
                if (fill)
                    cb.setPatternFill(pattern);
                else
                    cb.setPatternStroke(pattern);
            } catch (Exception ex) {
                if (fill)
                    cb.setColorFill(Color.gray);
                else
                    cb.setColorStroke(Color.gray);
            }
        }
    }
    
    private synchronized void waitForImage(java.awt.Image image) {
        if (mediaTracker == null)
            mediaTracker = new MediaTracker(new PdfGraphics2D.fakeComponent());
        mediaTracker.addImage(image, 0);
        try {
            mediaTracker.waitForID(0);
        }
        catch (InterruptedException e) {
            // empty on purpose
        }
        mediaTracker.removeImage(image);
    }
        
    static private class fakeComponent extends Component {

		private static final long serialVersionUID = 6450197945596086638L;
    }
}