fop-core/src/main/java/org/apache/fop/render/pdf/PDFGraphicsPainter.java - xmlgraphics-fop - Git at Google

 /*
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.
  * The ASF licenses this file to You under the Apache License, Version 2.0
  * (the "License"); you may not use this file except in compliance with
  * the License.  You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 /* $Id$ */

 package org.apache.fop.render.pdf;

 import java.awt.Color;
 import java.awt.Point;
 import java.awt.Rectangle;
 import java.io.IOException;

 import org.apache.fop.fo.Constants;
 import org.apache.fop.render.intermediate.ArcToBezierCurveTransformer;
 import org.apache.fop.render.intermediate.BezierCurvePainter;
 import org.apache.fop.render.intermediate.BorderPainter;
 import org.apache.fop.render.intermediate.GraphicsPainter;
 import org.apache.fop.traits.RuleStyle;
 import org.apache.fop.util.ColorUtil;

 /**
  * PDF-specific implementation of the {@link GraphicsPainter}.
  */
 public class PDFGraphicsPainter implements GraphicsPainter, BezierCurvePainter {

     private final PDFContentGeneratorHelper generator;

     /** Used for drawing arcs since PS does not natively support drawing elliptic curves */
     private final ArcToBezierCurveTransformer arcToBezierCurveTransformer;

     public PDFGraphicsPainter(PDFContentGenerator generator) {
         this.generator = new PDFContentGeneratorHelper(generator);
         this.arcToBezierCurveTransformer = new ArcToBezierCurveTransformer(this);
     }

     /** {@inheritDoc} */
     public void drawBorderLine(int x1, int y1, int x2, int y2, boolean horz,
             boolean startOrBefore, int style, Color col) {
         //TODO lose scale?
         drawBorderLine2(x1 / 1000f, y1 / 1000f, x2 / 1000f, y2 / 1000f,
                 horz, startOrBefore, style, col);
     }

     /** {@inheritDoc} */
     private void drawBorderLine2(float x1, float y1, float x2, float y2, boolean horz,
             boolean startOrBefore, int style, Color col) {
         float w = x2 - x1;
         float h = y2 - y1;
         float colFactor;
         switch (style) {
         case Constants.EN_DASHED:
             generator.setColor(col);
             if (horz) {
                 float dashedWidth = BorderPainter.dashWidthCalculator(w, h);
                 if (dashedWidth != 0) {
                     float ym = y1 + (h / 2);
                     generator.setDashLine(dashedWidth, dashedWidth * BorderPainter.DASHED_BORDER_SPACE_RATIO)
                             .setLineWidth(h)
                             .strokeLine(x1, ym, x2, ym);
                 }
             } else {
                 float dashedWidth = BorderPainter.dashWidthCalculator(h, w);
                 if (dashedWidth != 0) {
                     float xm = x1 + (w / 2);
                     generator.setDashLine(dashedWidth, dashedWidth * BorderPainter.DASHED_BORDER_SPACE_RATIO)
                             .setLineWidth(w)
                             .strokeLine(xm, y1, xm, y2);
                 }
             }
             break;
         case Constants.EN_DOTTED:
             generator.setColor(col).setRoundCap();
             if (horz) {
                 float unit = Math.abs(2 * h);
                 int rep = (int) (w / unit);
                 if (rep % 2 == 0) {
                     rep++;
                 }
                 unit = w / rep;
                 float ym = y1 + (h / 2);
                 generator.setDashLine(0, unit)
                         .setLineWidth(h)
                         .strokeLine(x1, ym, x2, ym);
             } else {
                 float unit = Math.abs(2 * w);
                 int rep = (int) (h / unit);
                 if (rep % 2 == 0) {
                     rep++;
                 }
                 unit = h / rep;
                 float xm = x1 + (w / 2);
                 generator.setDashLine(0, unit)
                         .setLineWidth(w)
                         .strokeLine(xm, y1, xm, y2);
             }
             break;
         case Constants.EN_DOUBLE:
             generator.setColor(col)
             .setSolidLine();
             if (horz) {
                 float h3 = h / 3;
                 float ym1 = y1 + (h3 / 2);
                 float ym2 = ym1 + h3 + h3;
                 generator.setLineWidth(h3)
                         .strokeLine(x1, ym1, x2, ym1)
                         .strokeLine(x1, ym2, x2, ym2);
             } else {
                 float w3 = w / 3;
                 float xm1 = x1 + (w3 / 2);
                 float xm2 = xm1 + w3 + w3;
                 generator.setLineWidth(w3)
                         .strokeLine(xm1, y1, xm1, y2)
                         .strokeLine(xm2, y1, xm2, y2);
             }
             break;
         case Constants.EN_GROOVE:
         case Constants.EN_RIDGE:
             colFactor = (style == Constants.EN_GROOVE ? 0.4f : -0.4f);
             generator.setSolidLine();
             if (horz) {
                 Color uppercol = ColorUtil.lightenColor(col, -colFactor);
                 Color lowercol = ColorUtil.lightenColor(col, colFactor);
                 float h3 = h / 3;
                 float ym1 = y1 + (h3 / 2);
                 generator.setLineWidth(h3)
                         .setColor(uppercol)
                         .strokeLine(x1, ym1, x2, ym1)
                         .setColor(col)
                         .strokeLine(x1, ym1 + h3, x2, ym1 + h3)
                         .setColor(lowercol)
                         .strokeLine(x1, ym1 + h3 + h3, x2, ym1 + h3 + h3);
             } else {
                 Color leftcol = ColorUtil.lightenColor(col, -colFactor);
                 Color rightcol = ColorUtil.lightenColor(col, colFactor);
                 float w3 = w / 3;
                 float xm1 = x1 + (w3 / 2);
                 generator.setLineWidth(w3)
                         .setColor(leftcol)
                         .strokeLine(xm1, y1, xm1, y2)
                         .setColor(col)
                         .strokeLine(xm1 + w3, y1, xm1 + w3, y2)
                         .setColor(rightcol)
                         .strokeLine(xm1 + w3 + w3, y1, xm1 + w3 + w3, y2);
             }
             break;
         case Constants.EN_INSET:
         case Constants.EN_OUTSET:
             colFactor = (style == Constants.EN_OUTSET ? 0.4f : -0.4f);
             generator.setSolidLine();
             Color c = col;
             if (horz) {
                 c = ColorUtil.lightenColor(c, (startOrBefore ? 1 : -1) * colFactor);
                 float ym1 = y1 + (h / 2);
                 generator.setLineWidth(h)
                         .setColor(c)
                         .strokeLine(x1, ym1, x2, ym1);
             } else {
                 c = ColorUtil.lightenColor(c, (startOrBefore ? 1 : -1) * colFactor);
                 float xm1 = x1 + (w / 2);
                 generator.setLineWidth(w)
                         .setColor(c)
                         .strokeLine(xm1, y1, xm1, y2);
             }
             break;
         case Constants.EN_HIDDEN:
             break;
         default:
             generator.setColor(col).setSolidLine();
             if (horz) {
                 float ym = y1 + (h / 2);
                 generator.setLineWidth(h)
                         .strokeLine(x1, ym, x2, ym);
             } else {
                 float xm = x1 + (w / 2);
                 generator.setLineWidth(w)
                         .strokeLine(xm, y1, xm, y2);
             }
         }
     }

     /** {@inheritDoc} */
     public void drawLine(Point start, Point end,
             int width, Color color, RuleStyle style) {
         if (start.y != end.y) {
             //TODO Support arbitrary lines if necessary
             throw new UnsupportedOperationException(
                     "Can only deal with horizontal lines right now");
         }
         saveGraphicsState();
         int half = width / 2;
         int starty = start.y - half;
         Rectangle boundingRect = new Rectangle(start.x, start.y - half, end.x - start.x, width);
         switch (style.getEnumValue()) {
         case Constants.EN_SOLID:
         case Constants.EN_DASHED:
         case Constants.EN_DOUBLE:
             drawBorderLine(start.x, start.y - half, end.x, end.y + half,
                     true, true, style.getEnumValue(), color);
             break;
         case Constants.EN_DOTTED:
             generator.clipRect(boundingRect)
             //This displaces the dots to the right by half a dot's width
             //TODO There's room for improvement here
                     .transformCoordinatesLine(1, 0, 0 , 1, half, 0);
             drawBorderLine(start.x, start.y - half, end.x, end.y + half, true, true, style.getEnumValue(),
                     color);
             break;
         case Constants.EN_GROOVE:
         case Constants.EN_RIDGE:
             generator.setFillColor(ColorUtil.lightenColor(color, 0.6f))
                     .fillRect(start.x, start.y, end.x, starty + 2 * half)
                     .setFillColor(color)
                     .fillRidge(style, start.x, start.y, end.x, end.y, half);
             break;
         default:
             throw new UnsupportedOperationException("rule style not supported");
         }
         restoreGraphicsState();
     }

     private static String format(int coordinate) {
         //TODO lose scale?
         return format(coordinate / 1000f);
     }

     private static String format(float coordinate) {
         return PDFContentGenerator.format(coordinate);
     }

     /** {@inheritDoc} */
     public void moveTo(int x, int y) {
         generator.moveTo(x, y);
     }

     /** {@inheritDoc} */
     public void lineTo(int x, int y) {
         generator.lineTo(x, y);
     }

     /** {@inheritDoc} */
     public void arcTo(final double startAngle, final double endAngle, final int cx, final int cy,
             final int width, final int height) throws IOException {
         arcToBezierCurveTransformer.arcTo(startAngle, endAngle, cx, cy, width, height);
     }

     /** {@inheritDoc} */
     public void closePath() {
         generator.closePath();
     }

     /** {@inheritDoc} */
     public void clip() {
         generator.clip();
     }

     /** {@inheritDoc} */
     public void saveGraphicsState() {
         generator.saveGraphicsState();
     }

     /** {@inheritDoc} */
     public void restoreGraphicsState() {
         generator.restoreGraphicsState();
     }

     /** {@inheritDoc} */
     public void rotateCoordinates(double angle) throws IOException {
         float s = (float) Math.sin(angle);
         float c = (float) Math.cos(angle);
         generator.transformFloatCoordinates(c, s, -s, c, 0, 0);
     }

     /** {@inheritDoc} */
     public void translateCoordinates(int xTranslate, int yTranslate) throws IOException {
         generator.transformCoordinates(1000, 0, 0, 1000, xTranslate, yTranslate);
     }

     /** {@inheritDoc} */
     public void scaleCoordinates(float xScale, float yScale) throws IOException {
         generator.transformFloatCoordinates(xScale, 0, 0, yScale, 0, 0);
     }

     /** {@inheritDoc} */
     public void cubicBezierTo(int p1x, int p1y, int p2x, int p2y, int p3x, int p3y) {
         generator.cubicBezierTo(p1x, p1y, p2x, p2y, p3x, p3y);
     }

     // TODO consider enriching PDFContentGenerator with part of this API
     private static class PDFContentGeneratorHelper {

         private final PDFContentGenerator generator;

         public PDFContentGeneratorHelper(PDFContentGenerator generator) {
             this.generator = generator;
         }

         public PDFContentGeneratorHelper moveTo(int x, int y) {
             return add("m", format(x), format(y));
         }

         public PDFContentGeneratorHelper lineTo(int x, int y) {
             return add("l", format(x), format(y));
         }

         /** {@inheritDoc} */
         public PDFContentGeneratorHelper cubicBezierTo(int p1x, int p1y, int p2x, int p2y, int p3x, int p3y) {
             return add("c", format(p1x), format(p1y), format(p2x), format(p2y), format(p3x), format(p3y));
         }

         public PDFContentGeneratorHelper closePath() {
             return add("h");
         }

         public PDFContentGeneratorHelper clip() {
             return addLine("W\nn");
         }

         public PDFContentGeneratorHelper clipRect(Rectangle rectangle) {
             generator.clipRect(rectangle);
             return this;
         }

         public PDFContentGeneratorHelper saveGraphicsState() {
             return addLine("q");
         }

         public PDFContentGeneratorHelper restoreGraphicsState() {
             return addLine("Q");
         }

         public PDFContentGeneratorHelper setSolidLine() {
             generator.add("[] 0 d ");
             return this;
         }

         public PDFContentGeneratorHelper setRoundCap() {
             return add("J", "1");
         }

         public PDFContentGeneratorHelper strokeLine(float xStart, float yStart, float xEnd, float yEnd) {
             add("m", xStart, yStart);
             return addLine("l S", xEnd, yEnd);
         }

         public PDFContentGeneratorHelper fillRect(int xStart, int yStart, int xEnd, int yEnd) {
             String xS = format(xStart);
             String xE = format(xEnd);
             String yS = format(yStart);
             String yE = format(yEnd);
             return addLine("m", xS, yS)
                     .addLine("l", xE, yS)
                     .addLine("l", xE, yE)
                     .addLine("l", xS, yE)
                     .addLine("h")
                     .addLine("f");
         }

         public PDFContentGeneratorHelper fillRidge(RuleStyle style, int xStart, int yStart, int xEnd,
                 int yEnd, int half) {
             String xS = format(xStart);
             String xE = format(xEnd);
             String yS = format(yStart);
             if (style == RuleStyle.GROOVE) {
                 addLine("m", xS, yS)
                         .addLine("l", xE, yS)
                         .addLine("l", xE, format(yStart + half))
                         .addLine("l", format(xStart + half), format(yStart + half))
                         .addLine("l", xS, format(yStart + 2 * half));
             } else {
                 addLine("m", xE, yS)
                         .addLine("l", xE, format(yStart + 2 * half))
                         .addLine("l", xS, format(yStart + 2 * half))
                         .addLine("l", xS, format(yStart + half))
                         .addLine("l", format(xEnd - half), format(yStart + half));
             }
             return addLine("h").addLine("f");
         }

         public PDFContentGeneratorHelper setLineWidth(float width) {
             return addLine("w", width);
         }

         public PDFContentGeneratorHelper setDashLine(float first, float... rest) {
             StringBuilder sb = new StringBuilder();
             sb.append("[").append(format(first));
             for (float unit : rest) {
                 sb.append(" ").append(format(unit));
             }
             sb.append("] 0 d ");
             generator.add(sb.toString());
             return this;
         }

         public PDFContentGeneratorHelper setColor(Color col) {
             generator.setColor(col, false);
             return this;
         }

         public PDFContentGeneratorHelper setFillColor(Color col) {
             generator.setColor(col, true);
             return this;
         }

         public PDFContentGeneratorHelper transformFloatCoordinates(float a, float b, float c, float d,
                 float e, float f) {
             return add("cm", a, b, c, d, e, f);
         }

         public PDFContentGeneratorHelper transformCoordinates(int a, int b, int c, int d, int e, int f) {
             return add("cm", format(a), format(b), format(c), format(d), format(e), format(f));
         }

         public PDFContentGeneratorHelper transformCoordinatesLine(int a, int b, int c, int d, int e, int f) {
             return addLine("cm", format(a), format(b), format(c), format(d), format(e), format(f));
         }

         public PDFContentGeneratorHelper add(String op) {
             assert op.equals(op.trim());
             generator.add(op + " ");
             return this;
         }

         private PDFContentGeneratorHelper add(String op, String... args) {
             add(createArgs(args), op);
             return this;
         }

         public PDFContentGeneratorHelper addLine(String op) {
             assert op.equals(op.trim());
             generator.add(op + "\n");
             return this;
         }

         public PDFContentGeneratorHelper addLine(String op, String... args) {
             addLine(createArgs(args), op);
             return this;
         }

         private PDFContentGeneratorHelper add(String op, float... args) {
             add(createArgs(args), op);
             return this;
         }

         public PDFContentGeneratorHelper addLine(String op, float... args) {
             addLine(createArgs(args), op);
             return this;
         }

         private StringBuilder createArgs(float... args) {
             StringBuilder sb = new StringBuilder();
             for (float arg : args) {
                 sb.append(format(arg)).append(" ");
             }
             return sb;
         }

         private StringBuilder createArgs(String... args) {
             StringBuilder sb = new StringBuilder();
             for (String arg : args) {
                 sb.append(arg).append(" ");
             }
             return sb;
         }

         private void add(StringBuilder args, String op) {
             assert op.equals(op.trim());
             generator.add(args.append(op).append(" ").toString());
         }

         private void addLine(StringBuilder args, String op) {
             assert op.equals(op.trim());
             generator.add(args.append(op).append("\n").toString());
         }
     }

 }
	/*
	* Licensed to the Apache Software Foundation (ASF) under one or more
	* contributor license agreements. See the NOTICE file distributed with
	* this work for additional information regarding copyright ownership.
	* The ASF licenses this file to You under the Apache License, Version 2.0
	* (the "License"); you may not use this file except in compliance with
	* the License. You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	/* $Id$ */

	package org.apache.fop.render.pdf;

	import java.awt.Color;
	import java.awt.Point;
	import java.awt.Rectangle;
	import java.io.IOException;

	import org.apache.fop.fo.Constants;
	import org.apache.fop.render.intermediate.ArcToBezierCurveTransformer;
	import org.apache.fop.render.intermediate.BezierCurvePainter;
	import org.apache.fop.render.intermediate.BorderPainter;
	import org.apache.fop.render.intermediate.GraphicsPainter;
	import org.apache.fop.traits.RuleStyle;
	import org.apache.fop.util.ColorUtil;

	/**
	* PDF-specific implementation of the {@link GraphicsPainter}.
	*/
	public class PDFGraphicsPainter implements GraphicsPainter, BezierCurvePainter {

	private final PDFContentGeneratorHelper generator;

	/** Used for drawing arcs since PS does not natively support drawing elliptic curves */
	private final ArcToBezierCurveTransformer arcToBezierCurveTransformer;

	public PDFGraphicsPainter(PDFContentGenerator generator) {
	this.generator = new PDFContentGeneratorHelper(generator);
	this.arcToBezierCurveTransformer = new ArcToBezierCurveTransformer(this);
	}

	/** {@inheritDoc} */
	public void drawBorderLine(int x1, int y1, int x2, int y2, boolean horz,
	boolean startOrBefore, int style, Color col) {
	//TODO lose scale?
	drawBorderLine2(x1 / 1000f, y1 / 1000f, x2 / 1000f, y2 / 1000f,
	horz, startOrBefore, style, col);
	}

	/** {@inheritDoc} */
	private void drawBorderLine2(float x1, float y1, float x2, float y2, boolean horz,
	boolean startOrBefore, int style, Color col) {
	float w = x2 - x1;
	float h = y2 - y1;
	float colFactor;
	switch (style) {
	case Constants.EN_DASHED:
	generator.setColor(col);
	if (horz) {
	float dashedWidth = BorderPainter.dashWidthCalculator(w, h);
	if (dashedWidth != 0) {
	float ym = y1 + (h / 2);
	generator.setDashLine(dashedWidth, dashedWidth * BorderPainter.DASHED_BORDER_SPACE_RATIO)
	.setLineWidth(h)
	.strokeLine(x1, ym, x2, ym);
	}
	} else {
	float dashedWidth = BorderPainter.dashWidthCalculator(h, w);
	if (dashedWidth != 0) {
	float xm = x1 + (w / 2);
	generator.setDashLine(dashedWidth, dashedWidth * BorderPainter.DASHED_BORDER_SPACE_RATIO)
	.setLineWidth(w)
	.strokeLine(xm, y1, xm, y2);
	}
	}
	break;
	case Constants.EN_DOTTED:
	generator.setColor(col).setRoundCap();
	if (horz) {
	float unit = Math.abs(2 * h);
	int rep = (int) (w / unit);
	if (rep % 2 == 0) {
	rep++;
	}
	unit = w / rep;
	float ym = y1 + (h / 2);
	generator.setDashLine(0, unit)
	.setLineWidth(h)
	.strokeLine(x1, ym, x2, ym);
	} else {
	float unit = Math.abs(2 * w);
	int rep = (int) (h / unit);
	if (rep % 2 == 0) {
	rep++;
	}
	unit = h / rep;
	float xm = x1 + (w / 2);
	generator.setDashLine(0, unit)
	.setLineWidth(w)
	.strokeLine(xm, y1, xm, y2);
	}
	break;
	case Constants.EN_DOUBLE:
	generator.setColor(col)
	.setSolidLine();
	if (horz) {
	float h3 = h / 3;
	float ym1 = y1 + (h3 / 2);
	float ym2 = ym1 + h3 + h3;
	generator.setLineWidth(h3)
	.strokeLine(x1, ym1, x2, ym1)
	.strokeLine(x1, ym2, x2, ym2);
	} else {
	float w3 = w / 3;
	float xm1 = x1 + (w3 / 2);
	float xm2 = xm1 + w3 + w3;
	generator.setLineWidth(w3)
	.strokeLine(xm1, y1, xm1, y2)
	.strokeLine(xm2, y1, xm2, y2);
	}
	break;
	case Constants.EN_GROOVE:
	case Constants.EN_RIDGE:
	colFactor = (style == Constants.EN_GROOVE ? 0.4f : -0.4f);
	generator.setSolidLine();
	if (horz) {
	Color uppercol = ColorUtil.lightenColor(col, -colFactor);
	Color lowercol = ColorUtil.lightenColor(col, colFactor);
	float h3 = h / 3;
	float ym1 = y1 + (h3 / 2);
	generator.setLineWidth(h3)
	.setColor(uppercol)
	.strokeLine(x1, ym1, x2, ym1)
	.setColor(col)
	.strokeLine(x1, ym1 + h3, x2, ym1 + h3)
	.setColor(lowercol)
	.strokeLine(x1, ym1 + h3 + h3, x2, ym1 + h3 + h3);
	} else {
	Color leftcol = ColorUtil.lightenColor(col, -colFactor);
	Color rightcol = ColorUtil.lightenColor(col, colFactor);
	float w3 = w / 3;
	float xm1 = x1 + (w3 / 2);
	generator.setLineWidth(w3)
	.setColor(leftcol)
	.strokeLine(xm1, y1, xm1, y2)
	.setColor(col)
	.strokeLine(xm1 + w3, y1, xm1 + w3, y2)
	.setColor(rightcol)
	.strokeLine(xm1 + w3 + w3, y1, xm1 + w3 + w3, y2);
	}
	break;
	case Constants.EN_INSET:
	case Constants.EN_OUTSET:
	colFactor = (style == Constants.EN_OUTSET ? 0.4f : -0.4f);
	generator.setSolidLine();
	Color c = col;
	if (horz) {
	c = ColorUtil.lightenColor(c, (startOrBefore ? 1 : -1) * colFactor);
	float ym1 = y1 + (h / 2);
	generator.setLineWidth(h)
	.setColor(c)
	.strokeLine(x1, ym1, x2, ym1);
	} else {
	c = ColorUtil.lightenColor(c, (startOrBefore ? 1 : -1) * colFactor);
	float xm1 = x1 + (w / 2);
	generator.setLineWidth(w)
	.setColor(c)
	.strokeLine(xm1, y1, xm1, y2);
	}
	break;
	case Constants.EN_HIDDEN:
	break;
	default:
	generator.setColor(col).setSolidLine();
	if (horz) {
	float ym = y1 + (h / 2);
	generator.setLineWidth(h)
	.strokeLine(x1, ym, x2, ym);
	} else {
	float xm = x1 + (w / 2);
	generator.setLineWidth(w)
	.strokeLine(xm, y1, xm, y2);
	}
	}
	}

	/** {@inheritDoc} */
	public void drawLine(Point start, Point end,
	int width, Color color, RuleStyle style) {
	if (start.y != end.y) {
	//TODO Support arbitrary lines if necessary
	throw new UnsupportedOperationException(
	"Can only deal with horizontal lines right now");
	}
	saveGraphicsState();
	int half = width / 2;
	int starty = start.y - half;
	Rectangle boundingRect = new Rectangle(start.x, start.y - half, end.x - start.x, width);
	switch (style.getEnumValue()) {
	case Constants.EN_SOLID:
	case Constants.EN_DASHED:
	case Constants.EN_DOUBLE:
	drawBorderLine(start.x, start.y - half, end.x, end.y + half,
	true, true, style.getEnumValue(), color);
	break;
	case Constants.EN_DOTTED:
	generator.clipRect(boundingRect)
	//This displaces the dots to the right by half a dot's width
	//TODO There's room for improvement here
	.transformCoordinatesLine(1, 0, 0 , 1, half, 0);
	drawBorderLine(start.x, start.y - half, end.x, end.y + half, true, true, style.getEnumValue(),
	color);
	break;
	case Constants.EN_GROOVE:
	case Constants.EN_RIDGE:
	generator.setFillColor(ColorUtil.lightenColor(color, 0.6f))
	.fillRect(start.x, start.y, end.x, starty + 2 * half)
	.setFillColor(color)
	.fillRidge(style, start.x, start.y, end.x, end.y, half);
	break;
	default:
	throw new UnsupportedOperationException("rule style not supported");
	}
	restoreGraphicsState();
	}

	private static String format(int coordinate) {
	//TODO lose scale?
	return format(coordinate / 1000f);
	}

	private static String format(float coordinate) {
	return PDFContentGenerator.format(coordinate);
	}

	/** {@inheritDoc} */
	public void moveTo(int x, int y) {
	generator.moveTo(x, y);
	}

	/** {@inheritDoc} */
	public void lineTo(int x, int y) {
	generator.lineTo(x, y);
	}

	/** {@inheritDoc} */
	public void arcTo(final double startAngle, final double endAngle, final int cx, final int cy,
	final int width, final int height) throws IOException {
	arcToBezierCurveTransformer.arcTo(startAngle, endAngle, cx, cy, width, height);
	}

	/** {@inheritDoc} */
	public void closePath() {
	generator.closePath();
	}

	/** {@inheritDoc} */
	public void clip() {
	generator.clip();
	}

	/** {@inheritDoc} */
	public void saveGraphicsState() {
	generator.saveGraphicsState();
	}

	/** {@inheritDoc} */
	public void restoreGraphicsState() {
	generator.restoreGraphicsState();
	}

	/** {@inheritDoc} */
	public void rotateCoordinates(double angle) throws IOException {
	float s = (float) Math.sin(angle);
	float c = (float) Math.cos(angle);
	generator.transformFloatCoordinates(c, s, -s, c, 0, 0);
	}

	/** {@inheritDoc} */
	public void translateCoordinates(int xTranslate, int yTranslate) throws IOException {
	generator.transformCoordinates(1000, 0, 0, 1000, xTranslate, yTranslate);
	}

	/** {@inheritDoc} */
	public void scaleCoordinates(float xScale, float yScale) throws IOException {
	generator.transformFloatCoordinates(xScale, 0, 0, yScale, 0, 0);
	}

	/** {@inheritDoc} */
	public void cubicBezierTo(int p1x, int p1y, int p2x, int p2y, int p3x, int p3y) {
	generator.cubicBezierTo(p1x, p1y, p2x, p2y, p3x, p3y);
	}

	// TODO consider enriching PDFContentGenerator with part of this API
	private static class PDFContentGeneratorHelper {

	private final PDFContentGenerator generator;

	public PDFContentGeneratorHelper(PDFContentGenerator generator) {
	this.generator = generator;
	}

	public PDFContentGeneratorHelper moveTo(int x, int y) {
	return add("m", format(x), format(y));
	}

	public PDFContentGeneratorHelper lineTo(int x, int y) {
	return add("l", format(x), format(y));
	}

	/** {@inheritDoc} */
	public PDFContentGeneratorHelper cubicBezierTo(int p1x, int p1y, int p2x, int p2y, int p3x, int p3y) {
	return add("c", format(p1x), format(p1y), format(p2x), format(p2y), format(p3x), format(p3y));
	}

	public PDFContentGeneratorHelper closePath() {
	return add("h");
	}

	public PDFContentGeneratorHelper clip() {
	return addLine("W\nn");
	}

	public PDFContentGeneratorHelper clipRect(Rectangle rectangle) {
	generator.clipRect(rectangle);
	return this;
	}

	public PDFContentGeneratorHelper saveGraphicsState() {
	return addLine("q");
	}

	public PDFContentGeneratorHelper restoreGraphicsState() {
	return addLine("Q");
	}

	public PDFContentGeneratorHelper setSolidLine() {
	generator.add("[] 0 d ");
	return this;
	}

	public PDFContentGeneratorHelper setRoundCap() {
	return add("J", "1");
	}

	public PDFContentGeneratorHelper strokeLine(float xStart, float yStart, float xEnd, float yEnd) {
	add("m", xStart, yStart);
	return addLine("l S", xEnd, yEnd);
	}

	public PDFContentGeneratorHelper fillRect(int xStart, int yStart, int xEnd, int yEnd) {
	String xS = format(xStart);
	String xE = format(xEnd);
	String yS = format(yStart);
	String yE = format(yEnd);
	return addLine("m", xS, yS)
	.addLine("l", xE, yS)
	.addLine("l", xE, yE)
	.addLine("l", xS, yE)
	.addLine("h")
	.addLine("f");
	}

	public PDFContentGeneratorHelper fillRidge(RuleStyle style, int xStart, int yStart, int xEnd,
	int yEnd, int half) {
	String xS = format(xStart);
	String xE = format(xEnd);
	String yS = format(yStart);
	if (style == RuleStyle.GROOVE) {
	addLine("m", xS, yS)
	.addLine("l", xE, yS)
	.addLine("l", xE, format(yStart + half))
	.addLine("l", format(xStart + half), format(yStart + half))
	.addLine("l", xS, format(yStart + 2 * half));
	} else {
	addLine("m", xE, yS)
	.addLine("l", xE, format(yStart + 2 * half))
	.addLine("l", xS, format(yStart + 2 * half))
	.addLine("l", xS, format(yStart + half))
	.addLine("l", format(xEnd - half), format(yStart + half));
	}
	return addLine("h").addLine("f");
	}

	public PDFContentGeneratorHelper setLineWidth(float width) {
	return addLine("w", width);
	}

	public PDFContentGeneratorHelper setDashLine(float first, float... rest) {
	StringBuilder sb = new StringBuilder();
	sb.append("[").append(format(first));
	for (float unit : rest) {
	sb.append(" ").append(format(unit));
	}
	sb.append("] 0 d ");
	generator.add(sb.toString());
	return this;
	}

	public PDFContentGeneratorHelper setColor(Color col) {
	generator.setColor(col, false);
	return this;
	}

	public PDFContentGeneratorHelper setFillColor(Color col) {
	generator.setColor(col, true);
	return this;
	}

	public PDFContentGeneratorHelper transformFloatCoordinates(float a, float b, float c, float d,
	float e, float f) {
	return add("cm", a, b, c, d, e, f);
	}

	public PDFContentGeneratorHelper transformCoordinates(int a, int b, int c, int d, int e, int f) {
	return add("cm", format(a), format(b), format(c), format(d), format(e), format(f));
	}

	public PDFContentGeneratorHelper transformCoordinatesLine(int a, int b, int c, int d, int e, int f) {
	return addLine("cm", format(a), format(b), format(c), format(d), format(e), format(f));
	}

	public PDFContentGeneratorHelper add(String op) {
	assert op.equals(op.trim());
	generator.add(op + " ");
	return this;
	}

	private PDFContentGeneratorHelper add(String op, String... args) {
	add(createArgs(args), op);
	return this;
	}

	public PDFContentGeneratorHelper addLine(String op) {
	assert op.equals(op.trim());
	generator.add(op + "\n");
	return this;
	}

	public PDFContentGeneratorHelper addLine(String op, String... args) {
	addLine(createArgs(args), op);
	return this;
	}

	private PDFContentGeneratorHelper add(String op, float... args) {
	add(createArgs(args), op);
	return this;
	}

	public PDFContentGeneratorHelper addLine(String op, float... args) {
	addLine(createArgs(args), op);
	return this;
	}

	private StringBuilder createArgs(float... args) {
	StringBuilder sb = new StringBuilder();
	for (float arg : args) {
	sb.append(format(arg)).append(" ");
	}
	return sb;
	}

	private StringBuilder createArgs(String... args) {
	StringBuilder sb = new StringBuilder();
	for (String arg : args) {
	sb.append(arg).append(" ");
	}
	return sb;
	}

	private void add(StringBuilder args, String op) {
	assert op.equals(op.trim());
	generator.add(args.append(op).append(" ").toString());
	}

	private void addLine(StringBuilder args, String op) {
	assert op.equals(op.trim());
	generator.add(args.append(op).append("\n").toString());
	}
	}

	}