metado.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

                    state.setCurrentBackgroundColor(in.readColor());
                    break;
                case META_SETTEXTCOLOR:
                    state.setCurrentTextColor(in.readColor());
                    break;
                case META_SETTEXTALIGN:
                    state.setTextAlign(in.readWord());
                    break;
                case META_SETBKMODE:
                    state.setBackgroundMode(in.readWord());
                    break;
                case META_SETPOLYFILLMODE:
                    state.setPolyFillMode(in.readWord());
                    break;
                case META_SETPIXEL:
                {
                    Color color = in.readColor();
                    int y = in.readShort();
                    int x = in.readShort();
                    cb.saveState();
                    cb.setColorFill(color);
                    cb.rectangle(state.transformX(x), state.transformY(y), .2f, .2f);
                    cb.fill();
                    cb.restoreState();
                    break;
                }
                case META_DIBSTRETCHBLT:
                case META_STRETCHDIB: {
                    int rop = in.readInt();
                    if (function == META_STRETCHDIB) {
                        /*int usage = */ in.readWord();
                    }
                    int srcHeight = in.readShort();
                    int srcWidth = in.readShort();
                    int ySrc = in.readShort();
                    int xSrc = in.readShort();
                    float destHeight = state.transformY(in.readShort()) - state.transformY(0);
                    float destWidth = state.transformX(in.readShort()) - state.transformX(0);
                    float yDest = state.transformY(in.readShort());
                    float xDest = state.transformX(in.readShort());
                    byte b[] = new byte[(tsize * 2) - (in.getLength() - lenMarker)];
                    for (int k = 0; k < b.length; ++k)
                        b[k] = (byte)in.readByte();
                    try {
                        ByteArrayInputStream inb = new ByteArrayInputStream(b);
                        Image bmp = BmpImage.getImage(inb, true, b.length);
                        cb.saveState();
                        cb.rectangle(xDest, yDest, destWidth, destHeight);
                        cb.clip();
                        cb.newPath();
                        bmp.scaleAbsolute(destWidth * bmp.getWidth() / srcWidth, -destHeight * bmp.getHeight() / srcHeight);
                        bmp.setAbsolutePosition(xDest - destWidth * xSrc / srcWidth, yDest + destHeight * ySrc / srcHeight - bmp.getScaledHeight());
                        cb.addImage(bmp);
                        cb.restoreState();
                    }
                    catch (Exception e) {
                        // empty on purpose
                    }
                    break;
                }
            }
            in.skip((tsize * 2) - (in.getLength() - lenMarker));
        }
        state.cleanup(cb);
    }
    
    public void outputText(int x, int y, int flag, int x1, int y1, int x2, int y2, String text) {
        MetaFont font = state.getCurrentFont();
        float refX = state.transformX(x);
        float refY = state.transformY(y);
        float angle = state.transformAngle(font.getAngle());
        float sin = (float)Math.sin(angle);
        float cos = (float)Math.cos(angle);
        float fontSize = font.getFontSize(state);
        BaseFont bf = font.getFont();
        int align = state.getTextAlign();
        float textWidth = bf.getWidthPoint(text, fontSize);
        float tx = 0;
        float ty = 0;
        float descender = bf.getFontDescriptor(BaseFont.DESCENT, fontSize);
        float ury = bf.getFontDescriptor(BaseFont.BBOXURY, fontSize);
        cb.saveState();
        cb.concatCTM(cos, sin, -sin, cos, refX, refY);
        if ((align & MetaState.TA_CENTER) == MetaState.TA_CENTER)
            tx = -textWidth / 2;
        else if ((align & MetaState.TA_RIGHT) == MetaState.TA_RIGHT)
            tx = -textWidth;
        if ((align & MetaState.TA_BASELINE) == MetaState.TA_BASELINE)
            ty = 0;
        else if ((align & MetaState.TA_BOTTOM) == MetaState.TA_BOTTOM)
            ty = -descender;
        else
            ty = -ury;
        Color textColor;
        if (state.getBackgroundMode() == MetaState.OPAQUE) {
            textColor = state.getCurrentBackgroundColor();
            cb.setColorFill(textColor);
            cb.rectangle(tx, ty + descender, textWidth, ury - descender);
            cb.fill();
        }
        textColor = state.getCurrentTextColor();
        cb.setColorFill(textColor);
        cb.beginText();
        cb.setFontAndSize(bf, fontSize);
        cb.setTextMatrix(tx, ty);
        cb.showText(text);
        cb.endText();
        if (font.isUnderline()) {
            cb.rectangle(tx, ty - fontSize / 4, textWidth, fontSize / 15);
            cb.fill();
        }
        if (font.isStrikeout()) {
            cb.rectangle(tx, ty + fontSize / 3, textWidth, fontSize / 15);
            cb.fill();
        }
        cb.restoreState();
    }
    
    public boolean isNullStrokeFill(boolean isRectangle) {
        MetaPen pen = state.getCurrentPen();
        MetaBrush brush = state.getCurrentBrush();
        boolean noPen = (pen.getStyle() == MetaPen.PS_NULL);
        int style = brush.getStyle();
        boolean isBrush = (style == MetaBrush.BS_SOLID || (style == MetaBrush.BS_HATCHED && state.getBackgroundMode() == MetaState.OPAQUE));
        boolean result = noPen && !isBrush;
        if (!noPen) {
            if (isRectangle)
                state.setLineJoinRectangle(cb);
            else
                state.setLineJoinPolygon(cb);
        }
        return result;
    }

    public void strokeAndFill(){
        MetaPen pen = state.getCurrentPen();
        MetaBrush brush = state.getCurrentBrush();
        int penStyle = pen.getStyle();
        int brushStyle = brush.getStyle();
        if (penStyle == MetaPen.PS_NULL) {
            cb.closePath();
            if (state.getPolyFillMode() == MetaState.ALTERNATE) {
                cb.eoFill();
            }
            else {
                cb.fill();
            }
        }
        else {
            boolean isBrush = (brushStyle == MetaBrush.BS_SOLID || (brushStyle == MetaBrush.BS_HATCHED && state.getBackgroundMode() == MetaState.OPAQUE));
            if (isBrush) {
                if (state.getPolyFillMode() == MetaState.ALTERNATE)
                    cb.closePathEoFillStroke();
                else
                    cb.closePathFillStroke();
            }
            else {
                cb.closePathStroke();
            }
        }
    }
    
    static float getArc(float xCenter, float yCenter, float xDot, float yDot) {
        double s = Math.atan2(yDot - yCenter, xDot - xCenter);
        if (s < 0)
            s += Math.PI * 2;
        return (float)(s / Math.PI * 180);
    }
    
    public static byte[] wrapBMP(Image image) throws IOException {
        if (image.getOriginalType() != Image.ORIGINAL_BMP)
            throw new IOException("Only BMP can be wrapped in WMF.");
        InputStream imgIn;
        byte data[] = null;
        if (image.getOriginalData() == null) {
            imgIn = image.getUrl().openStream();
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            int b = 0;
            while ((b = imgIn.read()) != -1)
                out.write(b);
            imgIn.close();
            data = out.toByteArray();
        }
        else
            data = image.getOriginalData();
        int sizeBmpWords = (data.length - 14 + 1) >>> 1;
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        // write metafile header
        writeWord(os, 1);
        writeWord(os, 9);
        writeWord(os, 0x0300);
        writeDWord(os, 9 + 4 + 5 + 5 + (13 + sizeBmpWords) + 3); // total metafile size
        writeWord(os, 1);
        writeDWord(os, 14 + sizeBmpWords); // max record size
        writeWord(os, 0);
        // write records
        writeDWord(os, 4);
        writeWord(os, META_SETMAPMODE);
        writeWord(os, 8);

        writeDWord(os, 5);
        writeWord(os, META_SETWINDOWORG);
        writeWord(os, 0);
        writeWord(os, 0);

        writeDWord(os, 5);
        writeWord(os, META_SETWINDOWEXT);
        writeWord(os, (int)image.getHeight());
        writeWord(os, (int)image.getWidth());

        writeDWord(os, 13 + sizeBmpWords);
        writeWord(os, META_DIBSTRETCHBLT);
        writeDWord(os, 0x00cc0020);
        writeWord(os, (int)image.getHeight());
        writeWord(os, (int)image.getWidth());
        writeWord(os, 0);
        writeWord(os, 0);
        writeWord(os, (int)image.getHeight());
        writeWord(os, (int)image.getWidth());
        writeWord(os, 0);
        writeWord(os, 0);
        os.write(data, 14, data.length - 14);
        if ((data.length & 1) == 1)
            os.write(0);
//        writeDWord(os, 14 + sizeBmpWords);
//        writeWord(os, META_STRETCHDIB);
//        writeDWord(os, 0x00cc0020);
//        writeWord(os, 0);
//        writeWord(os, (int)image.height());
//        writeWord(os, (int)image.width());
//        writeWord(os, 0);
//        writeWord(os, 0);
//        writeWord(os, (int)image.height());
//        writeWord(os, (int)image.width());
//        writeWord(os, 0);
//        writeWord(os, 0);
//        os.write(data, 14, data.length - 14);
//        if ((data.length & 1) == 1)
//            os.write(0);

        writeDWord(os, 3);
        writeWord(os, 0);
        os.close();
        return os.toByteArray();
    }

    public static void writeWord(OutputStream os, int v) throws IOException {
        os.write(v & 0xff);
        os.write((v >>> 8) & 0xff);
    }
    
    public static void writeDWord(OutputStream os, int v) throws IOException {
        writeWord(os, v & 0xffff);
        writeWord(os, (v >>> 16) & 0xffff);
    }
}